Summary:
Make `DestroyDB` slowly delete files if it's configured and enabled via `SstFileManager`.
It's currently not available mainly because of DeleteScheduler's logic related to tracked total_size_ and total_trash_size_. These accounting and logic should not be applied to `DestroyDB`. This PR adds a `DeleteUnaccountedDBFile` util for this purpose which deletes files without accounting it. This util also supports assigning a file to a specified trash bucket so that user can later wait for a specific trash bucket to be empty. For `DestroyDB`, files with more than 1 hard links will be deleted immediately.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12891
Test Plan: Added unit tests, existing tests.
Reviewed By: anand1976
Differential Revision: D60300220
Pulled By: jowlyzhang
fbshipit-source-id: 8b18109a177a3a9532f6dc2e40e08310c08ca3c7
Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12910
There is currently a call to `GetBGError()` in `DBImpl::WriteImplWALOnly()` where the DB mutex is (incorrectly) not held, leading to a data race. Technically, we could acquire the mutex here but instead, the patch removes the affected check altogether, since the same check is already performed (in a thread-safe manner) in the subsequent call to `PreprocessWrite()`.
Reviewed By: cbi42
Differential Revision: D60682008
fbshipit-source-id: 54b67975dcf57d67c068cac71e8ada09a1793ec5
Summary:
In leveled compaction, we pick intra-L0 compaction instead of L0->Lbase whenever L0 size is small. When L0 files contain many deletions, it makes more sense to compact then down instead of accumulating tombstones in L0. This PR uses compensated_file_size when computing L0 size for determining intra-L0 compaction. Also scale down the limit on total L0 size further to be more cautious about accumulating data in L0.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12878
Test Plan: updated unit test.
Reviewed By: hx235
Differential Revision: D59932421
Pulled By: cbi42
fbshipit-source-id: 9de973ac51eb7df81b38b8c68110072b1aa06321
Summary:
The `PessimisticTransaction::SetName()` code checks for an existing txn of the given name before registering the new txn. However, this is not atomic, which could result in a race condition if two txns try to register with the same name. Both might succeed and lead to unpredictable behavior. This PR makes the test and set atomic.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12895
Reviewed By: pdillinger
Differential Revision: D60460482
Pulled By: anand1976
fbshipit-source-id: e8afeb2356e1b8f4e8df785cb73532739f82579d
Summary:
**Context/Summary:**
We recently discovered a case where write of the same key right after error recovery of a previous failed write of the same key finishes causes two same WAL entries, violating our assertion. This is because we don't advance seqno on failed write and reuse the same WAL containing the failed write for the new write if the memtable at the time is empty.
This PR reuses the flush path for an empty memtable to switch WAL and update min WAL to keep in error recovery flush
as well as updates the INFO log message for clarity.
```
2024/07/17-15:01:32.271789 327757 (Original Log Time 2024/07/17-15:01:25.942234) [/flush_job.cc:1017] [default] [JOB 2] Level-0 flush table https://github.com/facebook/rocksdb/issues/9: 0 bytes OK It's an empty SST file from a successful flush so won't be kept in the DB
2024/07/17-15:01:32.271798 327757 (Original Log Time 2024/07/17-15:01:32.269954) [/memtable_list.cc:560] [default] Level-0 commit flush result of table https://github.com/facebook/rocksdb/issues/9 started
2024/07/17-15:01:32.271802 327757 (Original Log Time 2024/07/17-15:01:32.271217) [/memtable_list.cc:760] [default] Level-0 commit flush result of table https://github.com/facebook/rocksdb/issues/9: memtable https://github.com/facebook/rocksdb/issues/1 done
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12873
Test Plan:
New UT that failed before this PR with following assertion failure (i.e, duplicate WAL entries) and passes after
```
db_wal_test: db/write_batch.cc:2254: rocksdb::Status rocksdb::{anonymous}::MemTableInserter::PutCFImpl(uint32_t, const rocksdb::Slice&, const rocksdb::Slice&, rocksdb::ValueType, RebuildTxnOp, const ProtectionInfoKVOS64*) [with RebuildTxnOp = rocksdb::{anonymous}::MemTableInserter::PutCF(uint32_t, const rocksdb::Slice&, const rocksdb::Slice&)::<lambda(rocksdb::WriteBatch*, uint32_t, const rocksdb::Slice&, const rocksdb::Slice&)>; uint32_t = unsigned int; rocksdb::ProtectionInfoKVOS64 = rocksdb::ProtectionInfoKVOS<long unsigned int>]: Assertion `seq_per_batch_' failed.
```
Reviewed By: anand1976
Differential Revision: D59884468
Pulled By: hx235
fbshipit-source-id: 5d854b719092552c69727a979f269fb7f6c39756
Summary:
InitInputTableProperties() can open and do IOs and is called under mutex_. This PR removes it from FinalizeInputInfo(). It is now called in CompactionJob::Run() and BuildCompactionJobInfo() (called in NotifyOnCompactionBegin()) without holding mutex_.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12879
Test Plan: existing unit tests. Added assert in GetInputTableProperties() to ensure that input_table_properties_ is initialized whenever it's called.
Reviewed By: hx235
Differential Revision: D59933195
Pulled By: cbi42
fbshipit-source-id: c8089e13af8567fa3ab4b94d9ec384ae98ab2ec8
Summary:
... to enable use cases like using RocksDB to merge sort data for ingestion. A new file ingestion option `IngestExternalFileOptions::allow_db_generated_files` is introduced to allows users to ingest SST files generated by live DBs instead of SstFileWriter. For now this only works if the SST files being ingested have zero as their largest sequence number AND do not overlap with any data in the DB (so we can assign seqno 0 which matches the seqno of all ingested keys).
The feature is marked the option as experimental for now.
Main changes needed to enable this:
- ignore CF id mismatch during ingestion
- ignore the missing external file version table property
Rest of the change is mostly in new unit tests.
A previous attempt is in https://github.com/facebook/rocksdb/issues/5602.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12750
Test Plan: - new unit tests
Reviewed By: ajkr, jowlyzhang
Differential Revision: D58396673
Pulled By: cbi42
fbshipit-source-id: aae513afad7b1ff5d4faa48104df5f384926bf03
Summary:
This PR fixes an assertion failure in `DBImpl::ResumeImpl` - `assert(!versions_->descriptor_log_)`. In `VersionSet`, `descriptor_log_` has a pointer to the current MANIFEST writer. When there's an error updating the manifest, `descriptor_log_` is reset, and the error recovery thread checks `io_status()` in `VersionSet` and attempts to write a new MANIFEST. If another DB manipulation happens at the same time (like external file ingestion, column family manipulation etc), it calls `LogAndApply`, which also attempts to write a new MANIFEST. The assertion in `ResumeImpl` might fail in this case since the other MANIFEST writer may have updated `descriptor_log_`. To prevent the assertion, this fix updates both `io_status_` and `descriptor_log_` while holding the DB mutex.
The other option would have been to simply remove the assert. But I think its important to have it to ensure the invariant that `io_status_` is cleared if the MANIFEST is written successfully, and this fix makes things easier to reason about.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12871
Test Plan: Existing tests and crash test
Reviewed By: hx235
Differential Revision: D59926947
Pulled By: anand1976
fbshipit-source-id: af9ad18da3e29fc62c7ec2e30e0738aa33d4e5f1
Summary:
Basically, the fix in https://github.com/facebook/rocksdb/issues/8137 was incomplete (and I missed it in the review), because if `whole_key_filtering` is false, then `last_prefix_str_` will never be set to non-empty and the fix doesn't work. Also related to https://github.com/facebook/rocksdb/issues/5835.
This is intended as a safe, simple fix that will regress CPU efficiency slightly (for `whole_key_filtering=false` cases, because of extra prefix string copies during flush & compaction). An efficient fix is not possible without some substantial refactoring.
Also in this PR: new test DBBloomFilterTest.FilterNumEntriesCoalesce tests an adjacent code path that was previously untested for its effect of ensuring the number of unique prefixes and keys is tracked properly when both prefixes and whole keys are going into a filter. (Test fails when either of the two code segments checking for duplicates is disabled.) In addition, the same test would fail before the main bug fix here because the code would inappropriately add the empty string to the filter (because of unmodified `last_prefix_str_`).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12872
Test Plan: In addition to DBBloomFilterTest.FilterNumEntriesCoalesce, extended DBBloomFilterTest.SeekForPrevWithPartitionedFilters to cover the broken case. (Mostly whitespace change.)
Reviewed By: jowlyzhang
Differential Revision: D59873793
Pulled By: pdillinger
fbshipit-source-id: 2a7b7f09ca73dc188fb4dab833826ad6da7ebb11
Summary:
The failure of `WriteCurrentStateToManifest()` in `VersionSet::ProcessManifestWrites()` was not handled properly. If it failed, `manifest_io_status` was not updated, leading to `manifest_file_number_` being updated to the newly created manifest even though its bad. This would lead to the bad manifest immediately getting deleted, and also the good manifest (referenced by `CURRENT`) getting deleted by obsolete file deletion because of `manifest_file_number_` not referencing its number.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12865
Reviewed By: hx235
Differential Revision: D59782940
Pulled By: anand1976
fbshipit-source-id: f752fb9a1c23fd3d734616e273613cbac204301b
Summary:
**Context/Summary:**
`*auto_recovery` needs to be set true in order for `OnErrorRecoveryBegin()` to be called before auto-recovery
3db030d7ee/db/event_helpers.cc (L64-L66)
Currently it's set false for auto-recovery. This PR fixes it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12860
Test Plan:
- Manual observation that it is called
- Existing UT
Reviewed By: jowlyzhang
Differential Revision: D59693315
Pulled By: hx235
fbshipit-source-id: 3f428c5b1e9818bb7697fdcd7f245d11378eb14a
Summary:
Create C API function for iterating over WriteBatch for custom Column Families
Adding function to C API that exposes column family specific methods to iterate over WriteBatch: put_cf, delete_cf and merge_cf. This is required when the one needs to read changes for any non-default column family. Without that functionality it is impossible to iterate over changes in WAL that are relevant to custom column families.
Fixes https://github.com/facebook/rocksdb/issues/12790
Testing:
Added WriteBatch iteration test to "columnfamilies" section of C API unit tests
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12718
Reviewed By: cbi42
Differential Revision: D59483601
Pulled By: ajkr
fbshipit-source-id: b68b900636304528a38620a8c3ad82fdce4b60cb
Summary:
We are seeing a number of crash test failures coming from checkpoint and backup code, likely from WalManager::GetSortedWalFiles -> ... -> WalManager::ReadFirstLine and this code path is not needed, because we don't need to know the sequence numbers of WAL files going into a checkpoint or backup. We can minimize the impact of whatever inconsistency is causing that problem by not relying on it where it's not needed.
Similarly, when we only need a roughly accurate set of current WAL files, we don't need to query all the archived WAL files (and redundantly the live ones again).
So this reduces filesystem queries and DB mutex acquires in creating backups and checkpoints.
Needed follow-up:
Figure out what is causing various failures with an apparent inconsistency where GetSortedWalFiles fails on reading a WAL file. If it's an injected failure, perhaps it's not propagating that injected failure appropriately. It might also be an inconsistency between what the DB knows is flushed and what WalManager reads from the filesystem (which we know is dubious and should be phased out, which this is arguably another step toward). Or completing that phase-out might solve the problem without a full diagnosis.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12831
Test Plan:
existing tests (easily caught when I went too far in initally developing this change)
Update to BackupUsingDirectIO test so that there's a WAL file in what is backed up. (Was relying on some oddity.)
Reviewed By: cbi42
Differential Revision: D59252649
Pulled By: pdillinger
fbshipit-source-id: 7ad4187a1c70caa59a6d6c1c643ef95232b929f5
Summary:
**Context/Summary:**
It seems unreasonable to take the archived log size into account when calculating log size **for flush** in method CreateCheckpoint. If the user sets WAL_ttl_seconds or WAL_size_limit_MB, the argument _log_size_for_flush_ can easily be reached due to the size of the archived dir. As a result, the flush may always be triggered.
**Test**
corverd by ./checkpoint_test
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12680
Reviewed By: jaykorean
Differential Revision: D59097904
Pulled By: ajkr
fbshipit-source-id: 0ed29c1b078d8f40b85288541b008e00dbc517d3
Summary:
This PR adds user property collector factory `CompactForTieringCollectorFactory` to support observe SST file and mark it as need compaction for fast tracking data to the proper tier.
A triggering ratio `compaction_trigger_ratio_` can be configured to achieve the following:
1) Setting the ratio to be equal to or smaller than 0 disables this collector
2) Setting the ratio to be within (0, 1] will write the number of observed eligible entries into a user property and marks a file as need-compaction when aforementioned condition is met.
3) Setting the ratio to be higher than 1 can be used to just writes the user table property, and not mark any file as need compaction.
For a column family that does not enable tiering feature, even if an effective configuration is provided, this collector is still disabled. For a file that is already on the last level, this collector is also disabled.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12760
Test Plan: Added unit tests
Reviewed By: pdillinger
Differential Revision: D58734976
Pulled By: jowlyzhang
fbshipit-source-id: 6daab2c4f62b5c6689c3c03e3b3907bbbe6b7a81
Summary:
Unknown why these would ignore options like deadline and read_tier. Setting total_order_seek=true is unnecessary because of the disable_prefix_seek (= true) parameter to NewIndexIterator. This is only used by the hash index, which uses total order seek if either the ReadOption or the parameter is true. The parameter is arguably redundant with the total_order_seek option, meaning it could be eliminated, but I think this case is exceptional (compared to e.g. no_io):
* Prefix seek is particular to user iterators, though might be usable, carefully, for other read operations.
* The historical default of total_order_seek=false in a sense is "wrong result by default" so cannot be interpreted as an intent to force prefix seek in an operation for which it might be usual or give bad results.
Also added a generic release note to cover this and related PRs.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12764
Test Plan: existing tests
Reviewed By: hx235
Differential Revision: D58474240
Pulled By: pdillinger
fbshipit-source-id: 79014d9822ba8f09d57ce4524363aa0973017b68
Summary:
POSIX semantics for LinkFile (hard links) allow linking a file
that is still being written two, with both the source and destination
showing any subsequent writes to the source. This may not be practical
semantics for some FileSystem implementations such as remote storage.
They might only link the flushed or sync-ed file contents at time of
LinkFile, or might even have undefined behavior if LinkFile is called on
a file still open for write (not yet "sealed"). This change builds on https://github.com/facebook/rocksdb/issues/12731
to bring more hygiene to our handling of WAL files in Checkpoint.
Specifically, we now Close WAL files as soon as they are either
(a) inactive and fully synced, or (b) inactive and obsolete (so maybe
never fully synced), rather than letting Close() happen in handling
obsolete files (maybe a background thread). This should not be a
performance issue as Close() should be trivial cost relative to other
IO ops, but just in case:
* We don't Close() while holding a mutex, to avoid blocking, and
* The old behavior is available with a new kill switch option
`background_close_inactive_wals`.
Stacked on https://github.com/facebook/rocksdb/issues/12731
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12734
Test Plan:
Extended existing unit test, especially adding a hygiene
check to FaultInjectionTestFS to detect LinkFile() on a file still open
for writes. FaultInjectionTestFS already has relevant tracking data, and
tests can opt out of the new check, as in a smoke test I have left for
the old, deprecated functionality `background_close_inactive_wals=true`.
Also ran lengthy blackbox_crash_test to ensure the hygiene check is OK
with the crash test. (The only place I can find we use LinkFile in
production is Checkpoint.)
Reviewed By: cbi42
Differential Revision: D58295284
Pulled By: pdillinger
fbshipit-source-id: 64d90ed8477e2366c19eaf9c4c5ad60b82cac5c6
Summary:
**Context/Summary:** a better API design is decided lately so we decided to revert these two changes.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12738
Test Plan: - CI
Reviewed By: ajkr
Differential Revision: D58162165
Pulled By: hx235
fbshipit-source-id: 9bbe4d2fe9fbe39213f4cf137a2d419e6ffb8e16
Summary:
Background: there is one active WAL file but there can be
several more WAL files in various states. Those other WALs are always
in a "flushed" state but could be on the `logs_` list not yet fully
synced. We currently allow any WAL that is not the active WAL to be
hard-linked when creating a Checkpoint, as although it might still be
open for write, we are not appending any more data to it.
The problem is that a created Checkpoint is supposed to be fully synced
on return of that function, and a hard-linked WAL in the state described
above might not be fully synced. (Through some prudence in https://github.com/facebook/rocksdb/issues/10083,
it would synced if using track_and_verify_wals_in_manifest=true.)
The fix is a step toward a long term goal of removing the need to query
the filesystem to determine WAL files and their state. (I consider it
dubious any time we independently read from or query metadata from a
file we have open for writing, as this makes us more susceptible to
FileSystem deficiencies or races.) More specifically:
* Detect which WALs might not be fully synced, according to our DBImpl
metadata, and prevent hard linking those (with `trim_to_size=true`
from `GetLiveFilesStorageInfo()`. And while we're at it, use our known
flushed sizes for those WALs.
* To avoid a race between that and GetSortedWalFiles(), track a maximum
needed WAL number for the Checkpoint/GetLiveFilesStorageInfo.
* Because of the level of consistency provided by those two, we no
longer need to consider syncing as part of the FlushWAL in
GetLiveFilesStorageInfo. (We determine the max WAL number consistent
with the manifest file size, while holding DB mutex. Should make
track_and_verify_wals_in_manifest happy.) This makes the premise of
test PutRaceWithCheckpointTrackedWalSync obsolete (sync point callback
no longer hit) so the test is removed, with crash test as backstop for
related issues. See https://github.com/facebook/rocksdb/issues/10185
Stacked on https://github.com/facebook/rocksdb/issues/12729
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12731
Test Plan:
Expanded an existing test, which now fails before fix.
Also long runs of blackbox_crash_test with amplified checkpoint frequency.
Reviewed By: cbi42
Differential Revision: D58199629
Pulled By: pdillinger
fbshipit-source-id: 376e55f4a2b082cd2adb6408a41209de14422382
Summary:
A `BlockBasedTable` with `TieredSecondaryCache` containing a NVM cache inserts blocks into the compressed cache and the corresponding compressed block into the NVM cache. The `BlockFetcher` is used to get the uncompressed and compressed blocks by calling `ReadBlockContents()` and `GetUncompressedBlock()` respectively. If the file system supports FSBuffer (i.e returning a FS allocated buffer rather than caller provided), that buffer gets freed between the two calls. This PR fixes it by making the FSBuffer unique pointer a member rather than local variable.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12712
Test Plan:
1. Add a unit test
2. Release validation stress test
Reviewed By: jaykorean
Differential Revision: D57974026
Pulled By: anand1976
fbshipit-source-id: cfa895914e74b4f628413b40e6e39d8d8e5286bd
Summary:
We tested on icelake server (vcpu=160). The default configuration is allow_concurrent_memtable_write=1, thread number =activate core number. With our optimizations, the improvement can reach up to 184% in fillseq case. op/s is as the performance indicator in db_bench, and the following are performance improvements in some cases in db_bench.
| case name | optimized/original |
|-------------------:|--------------------:|
| fillrandom | 182% |
| fillseq | 184% |
| fillsync | 136% |
| overwrite | 179% |
| randomreplacekeys | 180% |
| randomtransaction | 161% |
| updaterandom | 163% |
| xorupdaterandom | 165% |
With analysis, we find that although the process of writing memtable is processed in parallel, the process of waking up the writers is not processed in parallel, which means that only one writers is responsible for the sequential waking up other writers. The following is our method to optimize this process.
Assume that there are currently n threads in total, we parallelize SetState in LaunchParallelMemTableWriters. To wake up each writer to write its own memtable, the leader writer first wakes up the (n^0.5-1) caller writers, and then those callers and the leader will wake up n/x separately to write to the memtable. This reduces the number for the leader's to SetState n-1 writers to 2*(n^0.5) writers in turn.
A reproduction script:
./db_bench --benchmarks="fillrandom" --threads ${number of all activate vcpu} --seed 1708494134896523 --duration 60
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12545
Reviewed By: ajkr
Differential Revision: D57422827
Pulled By: cbi42
fbshipit-source-id: 94127937c0c61e4241720bd902c82c607b7b2431
Summary:
Add the `--leader_path` option to specify the directory path of the leader for a follower RocksDB instance. This PR also adds a `count` command to the repl shell. While not specific to followers, it is useful for testing purposes.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12682
Reviewed By: jowlyzhang
Differential Revision: D57642296
Pulled By: anand1976
fbshipit-source-id: 53767d496ecadc363ff92cd958b8e15a7bf3b151
Summary:
This PR adds UpdateTimestamp API of WriteBatch and WBWI, create WB, WBWI with all options and Iterator Refresh in C API
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10529
Reviewed By: cbi42
Differential Revision: D57826913
Pulled By: ajkr
fbshipit-source-id: d2ec840129f61a1d3a5a12e859728be98ebbad2f
Summary:
These names are confusing with `Logger` etc. so moving to `WalFile` etc.
Other small, related name refactorings.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12695
Test Plan: Left most unit tests using old names as an API compatibility test. Non-test code compiles with deprecated names removed. No functional changes.
Reviewed By: ajkr
Differential Revision: D57747458
Pulled By: pdillinger
fbshipit-source-id: 7b77596b9c20d865d43b9dc66c30c8bd2b3b424f
Summary:
I think the point of the `if (end_of_buffer_offset_ - buffer_.size() == 0)` was to only set `recycled_` when the first record was read. However, the condition was false when reading the first record when the WAL began with a `kSetCompressionType` record because we had already dropped the `kSetCompressionType` record from `buffer_`. To fix this, I used `first_record_read_` instead.
Also, it was pretty confusing to treat the WAL as non-recycled when a recyclable record first appeared in a non-first record. I changed it to return an error if that happens.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12643
Reviewed By: hx235
Differential Revision: D57238099
Pulled By: ajkr
fbshipit-source-id: e20a2a0c9cf0c9510a7b6af463650a05d559239e
Summary:
**Context/Summary:** https://github.com/facebook/rocksdb/pull/12556 `avoid_sync_during_shutdown=false` missed an edge case where `manual_wal_flush == true` so WAL sync will still miss unflushed WAL. This PR fixes it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12684
Test Plan: modified UT to include this case `manual_wal_flush==true`
Reviewed By: cbi42
Differential Revision: D57655861
Pulled By: hx235
fbshipit-source-id: c9f49fe260e8b38b3ea387558432dcd9a3dbec19
Summary:
We recently noticed that some memtable flushed and file
ingestions could proceed during LockWAL, in violation of its stated
contract. (Note: we aren't 100% sure its actually needed by MySQL, but
we want it to be in a clean state nonetheless.)
Despite earlier skepticism that this could be done safely (https://github.com/facebook/rocksdb/issues/12666), I
found a place to wait to wait for LockWAL to be cleared before allowing
these operations to proceed: WaitForPendingWrites()
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12652
Test Plan:
Added to unit tests. Extended how db_stress validates LockWAL
and re-enabled combination of ingestion and LockWAL in crash test, in
follow-up to https://github.com/facebook/rocksdb/issues/12642
Ran blackbox_crash_test for a long while with relevant features
amplified.
Suggested follow-up: fix FaultInjectionTestFS to report file sizes
consistent with what the user has requested to be flushed.
Reviewed By: jowlyzhang
Differential Revision: D57622142
Pulled By: pdillinger
fbshipit-source-id: aef265fce69465618974b4ec47f4636257c676ce
Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12668
The patch adds a new `GetEntityForUpdate` API to optimistic and WriteCommitted pessimistic transactions, which provides transactional wide-column point lookup functionality with concurrency control. For WriteCommitted transactions, user-defined timestamps are also supported similarly to the `GetForUpdate` API.
Reviewed By: jaykorean
Differential Revision: D57458304
fbshipit-source-id: 7eadbac531ca5446353e494abbd0635d63f62d24
Summary:
`ReadOptions::pin_data` already has the effect of pinning the `Slice` returned by `Iterator::value()` when the value is stored inline (e.g., `kTypeValue`). This PR adds a bit of visibility into that via a new `Iterator` property, "rocksdb.iterator.is-value-pinned", as well as some documentation and tests.
See also: https://github.com/facebook/rocksdb/issues/12658
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12659
Reviewed By: cbi42
Differential Revision: D57391200
Pulled By: ajkr
fbshipit-source-id: 0caa8db27ca1aba86ee2addc3dfd6f0e003d32e2
Summary:
**Context/Summary:**
Previously `CompactFiles()` used `RangeOverlapWithCompaction()` to check for conflict when sanitizing input files while later used `FilesRangeOverlapWithCompaction()` to assert for no conflict. The latter function checks for more conflict scenarios than the former does, particularly the ones arising from `preclude_last_level_data_seconds > 0` (i.e, compaction can output to second-to-the-last level). So we ran into assertion violation in `CompactFiles()` like below
```
Assertion `output_level == 0 || !FilesRangeOverlapWithCompaction( input_files, output_level, Compaction::EvaluatePenultimateLevel(vstorage, ioptions_, start_level, output_level))' failed.
```
This PR make `CompactFiles()` used `FilesRangeOverlapWithCompaction()` and return Aborted status upon range conflict instead of crashing (during debug build) or proceed incorrectly (during non-debug build). To do so cleanly, I included a refactoring to make `FilesRangeOverlapWithCompaction()` part of `SanitizeAndConvertCompactionInputFiles()`, replacing `RangeOverlapWithCompaction()`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12628
Test Plan: New UT crashed before the fix and return correct status after the fix.
Reviewed By: cbi42
Differential Revision: D57123536
Pulled By: hx235
fbshipit-source-id: f963a2c9e7ba1a9927a67fcc87f0dce126d3a430
Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12634
The patch implements support for the `MultiGetEntity` API in optimistic transactions and pessimistic transactions with the WriteCommitted policy. Similarly to the other wide-column transaction APIs, the implementation leverages the `WriteBatchWithIndex` layer.
Reviewed By: jaykorean
Differential Revision: D57177638
fbshipit-source-id: 2d9f9f287fc97e7c126830b48d21457c7c35db3f
Summary:
In `SaveValue()`, the read lock needs to be obtained before `VerifyEntryChecksum()` because the KV checksum verification reads the entire value metadata+data, which is all mutable when `ColumnFamilyOptions::inplace_update_support == true`.
In `MemTable::Update()`, the write lock needs to be obtained before mutating the value metadata (changing the value size) because it can be read concurrently.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12624
Test Plan:
```
$ make COMPILE_WITH_TSAN=1 -j56 db_stress
...
$ python3 tools/db_crashtest.py blackbox --simple --max_key=10 --inplace_update_support=1 --interval=10 --allow_concurrent_memtable_write=0
```
Reviewed By: cbi42
Differential Revision: D57034571
Pulled By: ajkr
fbshipit-source-id: 3dddf881ad87923143acdf6bfec12ce47bb13a48
Summary:
For manual compaction, FIFO compaction will always skip key range overlapping checking with SST files. If CompactRange() is called with CompactionRangeOptions::change_level=true, a CF with FIFO compaction will now return Status::NotSupported.
For file ingestion, we will always ingest into L0. Previously, it's possible to ingest files into non-L0 levels with FIFO compaction.
These changes also help to fix [this](a178d15baf/db/db_impl/db_impl_compaction_flush.cc (L1269)) assertion failure in crash tests.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12618
Test Plan: added unit tests to verify the new behavior.
Reviewed By: hx235
Differential Revision: D56962401
Pulled By: cbi42
fbshipit-source-id: 19812a1509650b4162b379ca5bee02f2e9d9569d
Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12606
The patch extends optimistic transactions and WriteCommitted pessimistic transactions with support for the `PutEntity` API. Similarly to the other APIs, `PutEntity` is available via both the `Transaction` and `TransactionDB` interfaces, where using the latter executes the write in a single-operation transaction as usual. Support for read APIs and other write policies (WritePrepared, WriteUnprepared) will be added in separate PRs.
Reviewed By: jaykorean
Differential Revision: D56911242
fbshipit-source-id: 57cf8bb6c6b1b40ba4a8a652831c13a617644289
Summary:
Previously we skipped syncing the non-latest WALs during memtable flush when the DB had only one column family. Normally that is fine because those non-latest WALs would not be read by recovery. However, in case of `DBOptions::allow_2pc == true`, there could be unmatched prepare records in those WALs making them needed by recovery. As a result, the missing sync could have resulted in the recovered WAL state falling behind the recovered SST state. When we detect that case, we return a `Status::Corruption` saying "SST file is ahead of WALs".
This PR proposes syncing the WAL in case of `DBOptions::allow_2pc`. This introduces the sync in some scenarios where it isn't needed (e.g., non-recent WALs contain no prepares) but I suspect the simplicity is worth it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12622
Reviewed By: cbi42
Differential Revision: D56987303
Pulled By: ajkr
fbshipit-source-id: 7fe9395458018a18d77e907a3b5429065c0e2e48
Summary:
when importing files from multiple CFs into a new CF, we were reusing the epoch numbers assigned by the original CFs. This means L0 files in the new CF can have the same epoch number (assigned originally by different CFs). While CreateColumnFamilyWithImport() requires each original CF to have disjoint key range, after an intra-l0 compaction, we still can end up with L0 files with the same epoch number but overlapping key range. This PR attempt to fix this by reassigning epoch numbers when importing multiple CFs.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12602
Test Plan:
a new repro unit test. Before this PR, it fails with
```
[ RUN ] ImportColumnFamilyTest.AssignEpochNumberToMultipleCF
db/import_column_family_test.cc:1048: Failure
db_->WaitForCompact(o)
Corruption: force_consistency_checks(DEBUG): VersionBuilder: L0 files of same epoch number but overlapping range https://github.com/facebook/rocksdb/issues/44 , smallest key: '6B6579303030303030' seq:511, type:1 , largest key: '6B6579303031303239' seq:510, type:1 , epoch number: 3 vs. file https://github.com/facebook/rocksdb/issues/36 , smallest key: '6B6579303030313030' seq:401, type:1 , largest key: '6B6579303030313939' seq:500, type:1 , epoch number: 3
```
Reviewed By: hx235
Differential Revision: D56851808
Pulled By: cbi42
fbshipit-source-id: 01b8c790c9f1f2a168047ead670e73633f705b84
Summary:
This PR fix the issue that deletion of obsolete files during DB::Open are not rate limited.
The root cause is slow deletion is disabled if trash/db size ratio exceeds the configured `max_trash_db_ratio` d610e14f93/include/rocksdb/sst_file_manager.h (L126) however, the current handling in DB::Open starts with tracking nothing but the obsolete files. This will make the ratio always look like it's 1.
In order for the deletion rate limiting logic to work properly, we should only start deleting files after `SstFileManager` has finished tracking the whole DB, so the main fix is to move these two places that attempts to delete file after the tracking are done: 1) the `DeleteScheduler::CleanupDirectory` call in `SanitizeOptions`, 2) the `DB::DeleteObsoleteFiles` call.
There are some other aesthetic changes like refactoring collecting all the DB paths into a function, rename `DBImp::DeleteUnreferencedSstFiles` to `DBImpl:: MaybeUpdateNextFileNumber` as it doesn't actually delete the files.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12590
Test Plan: Added unit test and verified with manual testing
Reviewed By: anand1976
Differential Revision: D56830519
Pulled By: jowlyzhang
fbshipit-source-id: 8a38a21b1ea11c5371924f2b88663648f7a17885
Summary:
**Context/Summary:**
https://github.com/facebook/rocksdb/pull/12542 introduced a bug where wrong padded bytes used to generate file checksum if flush happens during padding. This PR fixed it along with an existing same bug for `perform_data_verification_=true`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12598
Test Plan:
- New UT that failed before this fix (`db->VerifyFileChecksums: ...Corruption: ...file checksum mismatch`) and passes after
- Benchmark
```
TEST_TMPDIR=/dev/shm ./db_bench --benchmarks=fillseq[-X300] --num=100000 --block_align=1 --compression_type=none
```
Pre-PR:
fillseq [AVG 300 runs] : 421334 (± 4126) ops/sec; 46.6 (± 0.5) MB/sec
Post-PR: (no regression observed but a slight improvement)
fillseq [AVG 300 runs] : 425768 (± 4309) ops/sec; 47.1 (± 0.5) MB/sec
Reviewed By: ajkr, anand1976
Differential Revision: D56725688
Pulled By: hx235
fbshipit-source-id: c1a700a95def8c65c0a21e44f8c1966164925ad5
Summary:
This feature has been around for a couple of years and users haven't reported any problems with it.
Not quite related: fixed a technical ODR violation in public header for info_log_level in case DEBUG build status changes.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12377
Test Plan: unit tests updated, already in crash test. Some unit tests are expecting specific behaviors of optimize_filters_for_memory=false and we now need to bake that in.
Reviewed By: jowlyzhang
Differential Revision: D54129517
Pulled By: pdillinger
fbshipit-source-id: a64b614840eadd18b892624187b3e122bab6719c
Summary:
See comment at top of the test case and release note.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12597
Reviewed By: jaykorean
Differential Revision: D56718786
Pulled By: ajkr
fbshipit-source-id: 8dce185bb0d24a358372fc2b553d181793fc335f
Summary:
When `recycle_log_file_num` is changed from 0 to non-zero and the DB is reopened, any log files from the previous session that are still alive get reused. However, the WAL records in those files are not in the recyclable format. If one of those files is reused and is empty, a subsequent re-open, in `RecoverLogFiles`, can replay those records and insert stale data into the memtable. Another manifestation of this is an assertion failure `first_seqno_ == 0 || s >= first_seqno_` in `rocksdb::MemTable::Add`.
We could fix this by either 1) Writing a special record when reusing a log file, or 2) Implement more rigorous checking in `RecoverLogFiles` to ensure we don't replay stale records, or 3) Not reuse files created by a previous DB session. We choose option 3 as its the simplest, and flipping `recycle_log_file_num` is expected to be a rare event.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12591
Test Plan: 1. Add a unit test to verify the bug and fix
Reviewed By: jowlyzhang
Differential Revision: D56655812
Pulled By: anand1976
fbshipit-source-id: aa3a26b4a5e892d39a54b5a0658233cbebebac87
Summary:
Made `BlockBasedTableOptions::block_align` incompatible (i.e., APIs will return `Status::InvalidArgument`) with more ways of enabling compression: `CompactionOptions::compression`, `ColumnFamilyOptions::compression_per_level`, and `ColumnFamilyOptions::bottommost_compression`. Previously it was only incompatible with `ColumnFamilyOptions::compression`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12592
Reviewed By: hx235
Differential Revision: D56650862
Pulled By: ajkr
fbshipit-source-id: f5201602c2ce436e6d8d30893caa6a161a61f141
Summary:
I had a TODO to complete `CompactionOptions`'s compression API but never did it: d610e14f93/db/compaction/compaction_picker.cc (L371-L373)
Without solving that TODO, the API remains incomplete and unsafe. Now, however, I don't think it's worthwhile to complete it. I think we should instead delete the API entirely. This PR deprecates it in preparation for deletion in a future major release. The `ColumnFamilyOptions` settings for compression should be good enough for `CompactFiles()` since they are apparently good enough for every other compaction, including `CompactRange()`.
In the meantime, I also changed the default `CompressionType`. Having callers of `CompactFiles()` use Snappy compression by default does not make sense when the default could be to simply use the same compression type that is used for every other compaction. As a bonus, this change makes the default `CompressionType` consistent with the `CompressionOptions` that will be used.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12587
Reviewed By: hx235
Differential Revision: D56619273
Pulled By: ajkr
fbshipit-source-id: 1477de49f14b06c72d6f0045616a8ce91d97e66e
Summary:
As mentioned in https://github.com/facebook/rocksdb/issues/12561 and https://github.com/facebook/rocksdb/issues/12566 , `NewIterators()` API has not been providing consistent view of the db across multiple column families. This PR addresses it by utilizing `MultiCFSnapshot()` function which has been used for `MultiGet()` APIs. To be able to obtain the thread-local super version with ref, `sv_exclusive_access` parameter has been added to `MultiCFSnapshot()` so that we could call `GetReferencedSuperVersion()` or `GetAndRefSuperVersion()` depending on the param and support `Refresh()` API for MultiCfIterators
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12573
Test Plan:
**Unit Tests Added**
```
./db_iterator_test --gtest_filter="*IteratorsConsistentView*"
```
```
./multi_cf_iterator_test -- --gtest_filter="*ConsistentView*"
```
**Performance Check**
Setup
```
make -j64 release
TEST_TMPDIR=/dev/shm/db_bench ./db_bench -benchmarks="filluniquerandom" -key_size=32 -value_size=512 -num=10000000 -compression_type=none
```
Run
```
TEST_TMPDIR=/dev/shm/db_bench ./db_bench -use_existing_db=1 -benchmarks="multireadrandom" -cache_size=10485760000
```
Before the change
```
DB path: [/dev/shm/db_bench/dbbench]
multireadrandom : 6.374 micros/op 156892 ops/sec 6.374 seconds 1000000 operations; (0 of 1000000 found)
```
After the change
```
DB path: [/dev/shm/db_bench/dbbench]
multireadrandom : 6.265 micros/op 159627 ops/sec 6.265 seconds 1000000 operations; (0 of 1000000 found)
```
Reviewed By: jowlyzhang
Differential Revision: D56444066
Pulled By: jaykorean
fbshipit-source-id: 327ce73c072da30c221e18d4f3389f49115b8f99
Summary:
Prior to this PR the following sequence could happen:
1. `RunManualCompaction()` A schedules compaction to thread pool and waits
2. `RunManualCompaction()` B waits without scheduling anything due to conflict
3. `DisableManualCompaction()` bumps `manual_compaction_paused_` and wakes up both
4. `RunManualCompaction()` A (`scheduled && !unscheduled`) unschedules its compaction and marks itself done
5. `RunManualCompaction()` B (`!scheduled && !unscheduled`) schedules compaction to thread pool
6. `RunManualCompaction()` B (`scheduled && !unscheduled`) waits on its compaction
7. `RunManualCompaction()` B at some point wakes up and finishes, either by unscheduling or by compaction execution
8. `DisableManualCompaction()` returns as there are no more manual compactions running
Between 6. and 7. the wait can be long while the compaction sits in the thread pool queue. That wait is unnecessary. This PR changes the behavior from step 5. onward:
5'. `RunManualCompaction()` B (`!scheduled && !unscheduled`) marks itself done
6'. `DisableManualCompaction()` returns as there are no more manual compactions running
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12578
Reviewed By: cbi42
Differential Revision: D56528144
Pulled By: ajkr
fbshipit-source-id: 4da2467376d7d4ff435547aa74dd8f118db0c03b
Summary:
Previously `insert_hints_` was used for both point key table (`table_`) and range deletion table (`range_del_table_`). Hints include pointers to table data, so mixing hints for different tables together without tracking which hint corresponds to which table was problematic. We can just make the hints dedicated to the point key table only.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12558
Reviewed By: hx235
Differential Revision: D56279019
Pulled By: ajkr
fbshipit-source-id: 00fe5ce72f9f11a1c1cba5f1977b908b2d518f29
Summary:
**Context/Summary:**
When `BlockBasedTableOptions::block_align=true`, we pad bytes to align blocks d41e568b1c/table/block_based/block_based_table_builder.cc (L1415-L1421).
Those bytes are not included in generating the file checksum upon file creation. But `VerifyFileChecksums()` includes those bytes in generating the file check to compare against the checksum generating upon file creation. Therefore a file checksum mismatch is returned in `VerifyFileChecksums()`.
We decided to include those padded bytes in generating the checksum upon file creation.
Bonus: also fix surrounding code to use actual padded bytes for verification - see https://github.com/facebook/rocksdb/pull/12542#discussion_r1571429163
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12542
Test Plan:
- New UT
- Benchmark
```
TEST_TMPDIR=/dev/shm ./db_bench --benchmarks=fillseq[-X300] --num=100000 --block_align=1 --compression_type=none
```
Pre-PR:
fillseq [AVG 300 runs] : 422857 (± 3942) ops/sec; 46.8 (± 0.4) MB/sec
Post-PR:
fillseq [AVG 300 runs] : 424707 (± 3799) ops/sec; 47.0 (± 0.4) MB/sec
Reviewed By: ajkr
Differential Revision: D56168447
Pulled By: hx235
fbshipit-source-id: 96209ef950d42943d336f11968ae3fcf9872fc2c
Summary:
This PR is a counterpart of https://github.com/facebook/rocksdb/issues/12427 . On file systems that support storage level data checksum and reconstruction, retry opening the DB if a corruption is detected when reading the MANIFEST. This could be done in `log::Reader`, but its a little complicated since the sequential file would have to be reopened in order to re-read the same data, and we may miss some subtle corruptions that don't result in checksum mismatch. The approach chosen here instead is to make the decision to retry in `DBImpl::Recover`, based on either an explicit corruption in the MANIFEST file, or missing SST files due to bad data in the MANIFEST.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12518
Reviewed By: ajkr
Differential Revision: D55932155
Pulled By: anand1976
fbshipit-source-id: 51755a29b3eb14b9d8e98534adb2e7d54b12ced9
Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12557
Unlike for other sequence containers, the C++ standard allows moving an `std::string` to invalidate pointers/iterators/references. In practice, this happens with short strings which are stored "inline" in the `std::string` object (small string optimization). Since `PinnableSlice` uses `std::string` as its internal buffer, and `PinnableWideColumns` in turn is implemented in terms of `PinnableSlice`, this means that the default compiler-generated move operations can invalidate the column index stored in `PinnableWideColumns::columns_`. The PR fixes this by providing custom move constructor/move assignment implementations for `PinnableWideColumns` that recreate the `columns_` index upon move.
Reviewed By: jaykorean
Differential Revision: D56275054
fbshipit-source-id: e8648c003dbcf1c39ec122ad229780c28138e730
Summary:
Adding an option to wait for purge to complete in `WaitForCompact` API.
Internally, RocksDB has a way to wait for purge to complete (e.g. TEST_WaitForPurge() in db_impl_debug.cc), but there's no public API available for gracefully wait for purge to complete.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12520
Test Plan:
Unit Test Added - `WaitForCompactWithWaitForPurgeOptionTest`
```
./deletefile_test -- --gtest_filter="*WaitForCompactWithWaitForPurgeOptionTest*"
```
Existing Tests
```
./db_compaction_test -- --gtest_filter="*WaitForCompactWithOption*"
```
Reviewed By: ajkr
Differential Revision: D55888283
Pulled By: jaykorean
fbshipit-source-id: cfc6d6e8657deaefab8961890b36e390095c9f65
Summary:
In https://github.com/facebook/rocksdb/issues/12365 we made `max_successive_merges` non-strict by default. Before https://github.com/facebook/rocksdb/issues/12365, `CountSuccessiveMergeEntries()`'s scan was implicitly limited to `max_successive_merges` entries for a given key, because after that the merge operator would be invoked and the merge chain would be collapsed. After https://github.com/facebook/rocksdb/issues/12365, the merge chain will not be collapsed no matter how long it is when the chain's operands are not all in memory. Since `CountSuccessiveMergeEntries()` scanned the whole merge chain, https://github.com/facebook/rocksdb/issues/12365 had a side effect that it would scan more memtable entries. This PR introduces a limit so it won't scan more entries than it could before.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12546
Reviewed By: jaykorean
Differential Revision: D56193693
Pulled By: ajkr
fbshipit-source-id: b070ba0703ef733e0ff230f89cd5cca5233b84da
Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12539
As a follow-up to https://github.com/facebook/rocksdb/pull/12533, this PR extends `WriteBatchWithIndex` with a `MultiGetEntityFromBatchAndDB` API that enables users to perform batched wide-column point lookups with read-your-own-writes consistency. This API transparently combines data from the indexed write batch and the underlying database as needed and presents the results in the form of a wide-column entity.
Reviewed By: jaykorean
Differential Revision: D56153145
fbshipit-source-id: 537967051b7521bb41b04070ac1a78a1d8873c08
Summary:
Continuing from the previous MultiCfIterator Implementations - (https://github.com/facebook/rocksdb/issues/12422, https://github.com/facebook/rocksdb/issues/12480#12465), this PR completes the `AttributeGroupIterator` by implementing `AttributeGroupIteratorImpl::AddToAttributeGroups()`. While implementing the `AttributeGroupIterator`, we had to make some changes in `MultiCfIteratorImpl` and found an opportunity to improve `Coalesce()` in `CoalescingIterator`.
Lifting `UNDER CONSTRUCTION - DO NOT USE` comment by replacing it with `EXPERIMENTAL`
Here are some implementation details:
- `IteratorAttributeGroups` is introduced to avoid having to copy all `WideColumn` objects during iteration.
- `PopulateIterator()` no longer advances non-top iterators that have the same key as the top iterator in the heap.
- `AdvanceIterator()` needs to advance the non-top iterators when they have the same key as the top iterator in the heap.
- Instead of populating one by one, `PopulateIterator()` now collects all items with the same key and calls `populate_func(items)` at once.
- This allowed optimization in `Coalesce()` such that we no longer do K-1 rounds of 2-way merge, but do one K-way merge instead.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12534
Test Plan:
Uncommented the assertions in `verifyAttributeGroupIterator()`
```
./multi_cf_iterator_test
```
Reviewed By: ltamasi
Differential Revision: D56089019
Pulled By: jaykorean
fbshipit-source-id: 6b0b4247e221f69b40b147d41492008cc9b15054
Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12533
The PR extends `WriteBatchWithIndex` with a new wide-column point lookup API `GetEntityFromBatchAndDB`. Similarly to `GetFromBatchAndDB`, the new API can transparently combine data from the write batch with data from the underlying database as needed. Like `DB::GetEntity`, it returns any result in the form of a wide-column entity (i.e. plain key-values are wrapped into an entity with a single anonymous column).
Reviewed By: jaykorean
Differential Revision: D56069132
fbshipit-source-id: 4f19cdeea4ce136497ce79fc9d28c925de59e220
Summary:
This PR adds support to programmatically iterate a raw table file with an iterator returned by `SstFileReader::NewTableIterator`. For third party tools to use to observe SST files created by RocksDB.
The original feature request was from this merge request: https://github.com/facebook/rocksdb/pull/12370
Since keys returned by raw table iterators are internal keys, this PR also adds a struct `ParsedEntryInfo` and util method `ParseEntry` to support user to parse internal key. `GetInternalKeyForSeek`, and `GetInternalKeyForSeekForPrev` to support users to create internal keys for seek operations with this raw table iterator.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12385
Test Plan: Added unit tests
Reviewed By: cbi42
Differential Revision: D55662855
Pulled By: jowlyzhang
fbshipit-source-id: 0716a173ee95924fbd4e1f9b6cccf06525c40049
Summary:
**Context/Summary:**
We recently discovered that `CompactRange(change_level=true, target_level=0)` can possibly refit more than 1 files to L0. This refitting can cause read performance regression as we need to go through every file in L0, corruption in some edge case and false positive corruption caught by force consistency check. We decided to explicitly disallow such behavior.
A related change to OptionChangeMigration():
- When migrating to FIFO with `compaction_options_fifo.max_table_files_size > 0`, RocksDB will [CompactRange() all the to-be-migrate data into a couple L0 files](https://github.com/facebook/rocksdb/blob/main/utilities/option_change_migration/option_change_migration.cc#L164-L169) to avoid dropping all the data upon migration finishes when the migrated data is larger than max_table_files_size. This is achieved by first compacting all the data into a couple non-L0 files and refitting those files from non-L0 to L0 if needed. In that way, only some data instead of all data will be dropped immediately after migration to FIFO with a max_table_files_size.
- Since this type of refitting behavior is disallowed from now on, we won't do this trick anymore and explicitly state such risk in API comment.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12481
Test Plan:
- New UT
- Modified UT
Reviewed By: cbi42
Differential Revision: D55351178
Pulled By: hx235
fbshipit-source-id: 9d8854f2f81d7e8aff859c3a4e53b7d688048e80
Summary:
This option was previously disabled due to a bug in the recovery logic. The recovery code in `DBImpl::RecoverLogFiles` couldn't tell if an EoF reported by the log reader was really an EoF or a possible corruption that made a record look like an old log record. To fix this, the log reader now explicitly reports when it encounters what looks like an old record. The recovery code treats it as a possible corruption, and uses the next sequence number in the WAL to determine if it should continue replaying the WAL.
This PR also fixes a couple of bugs that log file recycling exposed in the backup and checkpoint path.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12403
Test Plan:
1. Add new unit tests to verify behavior upon corruption
2. Re-enable disabled tests for verifying recycling behavior
Reviewed By: ajkr
Differential Revision: D54544824
Pulled By: anand1976
fbshipit-source-id: 12f5ce39bd6bc0d63b0bc6432dc4db510e0e802a
Summary:
This PR contains a few follow ups from https://github.com/facebook/rocksdb/issues/12419 and https://github.com/facebook/rocksdb/issues/12428 including:
1) Handle a special case for `WriteBatch::TimedPut`. When the user specified write time is `std::numeric_limits<uint64_t>::max()`, it's not treated as an error, but it instead creates and writes a regular `Put` entry.
2) Update the `InternalIterator::write_unix_time` APIs to handle `kTypeValuePreferredSeqno` entries.
3) FlushJob is updated to use the seqno to time mapping copy in `SuperVersion`. FlushJob currently copy the DB's seqno to time mapping while holding db mutex and only copies the part of interest, a.k.a, the part that only goes back to the earliest sequence number of the to-be-flushed memtables. While updating FlushJob to use the mapping copy in `SuperVersion`, it's given access to the full mapping to help cover the need to convert `kTypeValuePreferredSeqno`'s write time to preferred seqno as much as possible.
Test plans:
Added unit tests
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12455
Reviewed By: pdillinger
Differential Revision: D55165422
Pulled By: jowlyzhang
fbshipit-source-id: dc022653077f678c24661de5743146a74cce4b47
Summary:
On file systems that support storage level data checksum and reconstruction, retry SST block reads for point lookups, scans, and flush and compaction if there's a checksum mismatch on the initial read. A file system can indicate its support by setting the `FSSupportedOps::kVerifyAndReconstructRead` bit in `SupportedOps`.
Tests:
Add new unit tests
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12427
Reviewed By: ajkr
Differential Revision: D55025941
Pulled By: anand1976
fbshipit-source-id: dbd990cb75e03f756c8a66d42956f645c0b6d55e
Summary:
Thanks ltamasi for pointing out this bug.
We were incorrectly overwriting `Status::Incomplete` with `Status::OK` after a table cache miss failed to open the file due to the read being memory-only (`kBlockCacheTier`). The fix is to simply stop overwriting the status.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12443
Reviewed By: cbi42
Differential Revision: D54930128
Pulled By: ajkr
fbshipit-source-id: 52f912a2e93b46e71d79fc5968f8ca35b299213d
Summary:
The use case is similar to `MergeOperator::ShouldMerge()` for `Get()`: preventing reads into LSM components for merge operands that are of no interest to the user. `MergeOperator::ShouldMerge()` cannot be reused here because:
- Its name does not make sense in the context of `GetMergeOperands()` since `GetMergeOperands()` never invokes merge
- The callback is part of the `MergeOperator`, but an option specific to the read operation makes more sense to me
If there are any ideas for an API design that covers both `MergeOperator::ShouldMerge()`'s use cases and `GetMergeOperandsOptions::continue_cb`'s use cases, that would be ideal, but for now this is what I came up with.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12438
Reviewed By: hx235
Differential Revision: D54914669
Pulled By: ajkr
fbshipit-source-id: 5f3ff78d3890adc0b1b74bedf3921221930ce63a
Summary:
Crash tests were failing due to data race in accessing `purge_wal_files_last_run_`. This PR changes it to atomic.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12439
Test Plan:
- existing UT
- not able to repro with `python3 tools/db_crashtest.py whitebox --simple --max_key=25000000 --WAL_ttl_seconds=1` and TSAN yet, will monitor internal crash tests
Reviewed By: anand1976
Differential Revision: D54920817
Pulled By: cbi42
fbshipit-source-id: 80ee026b1785ad5dba11295ed35c88889df5f5a6
Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12424
The PR adds a wide-column point lookup API `GetEntityFromBatch` to `WriteBatchWithIndex`. Similarly to APIs like `DB::GetEntity`, this new API returns wide-column entities as-is, and wraps plain values in an entity with a single column (the anonymous default column). Also, similarly to `WriteBatchWithIndex::GetFromBatch`, it only reads data from the batch itself.
Reviewed By: jaykorean
Differential Revision: D54826535
fbshipit-source-id: 92604f3ebd90fe1afbd36f2d2194b7dee0011efa
Summary:
When PR https://github.com/facebook/rocksdb/issues/9629 introduced user-defined timestamp support for `WriteCommittedTxn`, it adds this usage mandate for API `GetForUpdate` when UDT is enabled. The `do_validate` flag has to be true, and user should have already called `Transaction::SetReadTimestampForValidation` to set a read timestamp for validation. The rationale behind this mandate is this:
1) with do_vaildate = true, `GetForUpdate` could verify this relationships: let's denote the user-defined timestamp in db for the key as `Ts_db` and the read timestamp user set via `Transaction::SetReadTimestampForValidation` as `Ts_read`. UDT based validation will only pass if `Ts_db <= Ts_read`.
5950907a82/utilities/transactions/transaction_util.cc (L141)
2) Let's denote the committed timestamp set via `Transaction::SetCommitTimestamp` to be `Ts_cmt`. Later `WriteCommitedTxn::Commit` would only pass if this condition is met: `Ts_read < Ts_cmt`. 5950907a82/utilities/transactions/pessimistic_transaction.cc (L431)
Together these two checks can ensure `Ts_db < Ts_cmt` to meet the user-defined timestamp invariant that newer timestamp should have newer sequence number.
The `do_validate` flag was originally intended to make snapshot based validation optional. If it's true, `GetForUpdate` checks no entry is written after the snapshot. If it's false, it will skip this snapshot based validation. In this PR, we are making the UDT based validation configurable too based on this flag instead of mandating it for below reasons: 1) in some cases the users themselves can enforce aformentioned invariant on their side independently, without RocksDB help, for example, if they are managing a monotonically increasing timestamp, and their transactions are only committed in a single thread. So they don't need this UDT based validation and wants to skip it, 2) It also could be expensive or not practical for users to come up with such a read timestamp that is exactly in between their commit timestamp and the db's timestamp. For example, in aformentioned case where a monotonically increasing timestamp is managed, the users would need to access this timestamp both for setting the read timestamp and for setting the commit timestamp. So it's preferable to skip this check too.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12369
Test Plan: added unit tests
Reviewed By: ltamasi
Differential Revision: D54268920
Pulled By: jowlyzhang
fbshipit-source-id: ca7693796f9bb11f376a2059d91841e51c89435a
Summary:
This PR updates `VersionEditHandlerPointInTime` to recover all or none of the updates in an AtomicGroup. This makes best-effort recovery properly handle atomic flushes during recovery, so the features are now allowed to both be enabled at once.
The new logic requires that AtomicGroups do not contain column family additions or removals. AtomicGroups are currently written for atomic flush, which does not include such edits.
Column family additions or removals are recovered independently of AtomicGroups. The new logic needs to be aware of removal, though, so that a dropped CF does not prevent completion of an AtomicGroup recovery.
The new logic treats each AtomicGroup as if it contains updates for all existing column families, even though it is possible to create AtomicGroups that only affect a subset of column families. This simplifies the logic at the expense of recovering less data in certain edge case scenarios.
The usage of `MaybeCreateVersion()` is pretty tricky. The goal is to create a barrier at the start of an AtomicGroup such that all valid states up to that point will be applied to `versions_`. Here is a summary.
- `MaybeCreateVersion(..., false)` creates a `Version` on a negative edge trigger (transition from valid to invalid). It was previously called when applying each update. Now, it is only called when applying non-AtomicGroup updates.
- `MaybeCreateVersion(..., true)` creates a `Version` on a positive level trigger (valid state). It was previously called only at the end of iteration. Now, it is additionally called before processing an AtomicGroup.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12406
Reviewed By: jaykorean, cbi42
Differential Revision: D54494904
Pulled By: ajkr
fbshipit-source-id: 0114a9fe1d04b471d086dcab5978ea8a3a56ad52
Summary:
Partly following up on leftovers from https://github.com/facebook/rocksdb/issues/12388
In terms of public API:
* Make it clear that IngestExternalFileArg::file_temperature is just a hint for opening the existing file, though it was previously used for both copy-from temp hint and copy-to temp, which was bizarre.
* Specify how IngestExternalFile assigns temperature to file ingested into DB. (See details in comments.) This approach is not perfect in terms of matching how the DB assigns temperatures, but was the simplest way to get close. The key complication for matching DB temperature assignments is that ingestion files are copied (to a destination temp) before their target level is determined (in general).
* Add a temperature option to SstFileWriter::Open so that files intended for ingestion can be initially written to a chosen temperature.
* Note that "fail_if_not_bottommost_level" is obsolete/confusing use of "bottommost"
In terms of the implementation, there was a similar bit of oddness with the internal CopyFile API, which only took one temperature, ambiguously applicable to the source, destination, or both. This is also fixed.
Eventual suggested follow-up:
* Before copying files for ingestion, determine a tentative level assignment to use for destination temperature, and keep that even if final level assignment happens to be different at commit time (rare).
* More temperature handling for CreateColumnFamilyWithImport and Checkpoints.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12402
Test Plan:
Deeply revamped
ExternalSSTFileBasicTest.IngestWithTemperature to test the new changes. Previously this test was insufficient because it was only looking at temperatures according to the DB manifest. Incorporating FileTemperatureTestFS allows us to also test the temperatures in the storage layer.
Used macros instead of functions for better tracing to critical source location on test failures.
Some enhancements to FileTemperatureTestFS in the process of developing the revamped test.
Reviewed By: jowlyzhang
Differential Revision: D54442794
Pulled By: pdillinger
fbshipit-source-id: 41d9d0afdc073e6a983304c10bbc07c70cc7e995
Summary:
The current design proposes using a combination of `job_id`, `db_id`, and `db_session_id` to create a unique identifier for remote compaction jobs. However, this approach may not be suitable for users who prefer a different format for the unique identifier.
At Meta, we are utilizing generic compute offload to offload compaction tasks to remote workers. The compute offload client generates a UUID for each task, which requires an update to the current RocksDB API for onboarding purposes.
Users still have the option to create the unique identifier by combining `job_id`, `db_id`, and `db_session_id` if they prefer.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12384
Test Plan:
```
$> ./compaction_service_test 13:29:35
[==========] Running 14 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 14 tests from CompactionServiceTest
[ RUN ] CompactionServiceTest.BasicCompactions
[ OK ] CompactionServiceTest.BasicCompactions (2642 ms)
[ RUN ] CompactionServiceTest.ManualCompaction
[ OK ] CompactionServiceTest.ManualCompaction (454 ms)
[ RUN ] CompactionServiceTest.CancelCompactionOnRemoteSide
[ OK ] CompactionServiceTest.CancelCompactionOnRemoteSide (1643 ms)
[ RUN ] CompactionServiceTest.FailedToStart
[ OK ] CompactionServiceTest.FailedToStart (1332 ms)
[ RUN ] CompactionServiceTest.InvalidResult
[ OK ] CompactionServiceTest.InvalidResult (1516 ms)
[ RUN ] CompactionServiceTest.SubCompaction
[ OK ] CompactionServiceTest.SubCompaction (551 ms)
[ RUN ] CompactionServiceTest.CompactionFilter
[ OK ] CompactionServiceTest.CompactionFilter (563 ms)
[ RUN ] CompactionServiceTest.Snapshot
[ OK ] CompactionServiceTest.Snapshot (124 ms)
[ RUN ] CompactionServiceTest.ConcurrentCompaction
[ OK ] CompactionServiceTest.ConcurrentCompaction (660 ms)
[ RUN ] CompactionServiceTest.CompactionInfo
[ OK ] CompactionServiceTest.CompactionInfo (984 ms)
[ RUN ] CompactionServiceTest.FallbackLocalAuto
[ OK ] CompactionServiceTest.FallbackLocalAuto (343 ms)
[ RUN ] CompactionServiceTest.FallbackLocalManual
[ OK ] CompactionServiceTest.FallbackLocalManual (380 ms)
[ RUN ] CompactionServiceTest.RemoteEventListener
[ OK ] CompactionServiceTest.RemoteEventListener (491 ms)
[ RUN ] CompactionServiceTest.TablePropertiesCollector
[ OK ] CompactionServiceTest.TablePropertiesCollector (169 ms)
[----------] 14 tests from CompactionServiceTest (11854 ms total)
[----------] Global test environment tear-down
[==========] 14 tests from 1 test case ran. (11855 ms total)
[ PASSED ] 14 tests.
```
Reviewed By: hx235
Differential Revision: D54220339
Pulled By: jaykorean
fbshipit-source-id: 5a9054f31933d1996adca02082eb37b6d5353224
Summary:
.. so write time can be measured under the new perf level for single-threaded writes.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12394
Test Plan: * add a new UT `PerfContextTest.WriteMemtableTimePerfLevel`
Reviewed By: anand1976
Differential Revision: D54326263
Pulled By: cbi42
fbshipit-source-id: d0e334d9581851ba6cf53c776c0bd876365d1e00
Summary:
When the rate limiter does not have any waiting requests, the first request to arrive may consume all of the available bandwidth, despite potentially having lower priority than requests that arrive later in the same refill interval. Then, those higher priority requests must wait for a refill. So even in scenarios in which we have an overall bandwidth surplus, the highest priority requests can be sporadically delayed up to a whole refill period.
Alone, this isn't necessarily problematic as the refill period is configurable via `refill_period_us` and can be tuned down as needed until the max sporadic delay is tolerable. However, tuning down `refill_period_us` had a side effect of reducing burst size. Some users require a certain burst size to issue optimal I/O sizes to the underlying storage system.
To satisfy those users, this PR decouples the refill period from the burst size. That way, the max sporadic delay can be limited without impacting I/O sizes issued to the underlying storage system.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12379
Test Plan:
The goal is to show we can now limit the max sporadic delay without impacting compaction's I/O size.
The benchmark runs compaction with a large I/O size, while user reads simultaneously run at a low rate that does not consume all of the available bandwidth. The max sporadic delay is measured using the P100 of rocksdb.file.read.get.micros. I just used strace to verify the compaction reads follow `rate_limiter_single_burst_bytes`
Setup: `./db_bench -benchmarks=fillrandom,flush -write_buffer_size=67108864 -disable_auto_compactions=true -value_size=256 -num=1048576`
Benchmark: `./db_bench -benchmarks=readrandom -use_existing_db=true -num=1048576 -duration=10 -benchmark_read_rate_limit=4096 -rate_limiter_bytes_per_sec=67108864 -rate_limiter_refill_period_us=$refill_micros -rate_limiter_single_burst_bytes=16777216 -rate_limit_bg_reads=true -rate_limit_user_ops=true -statistics=true -cache_size=0 -stats_level=5 -compaction_readahead_size=16777216 -use_direct_reads=true`
Results:
refill_micros | rocksdb.file.read.get.micros (P100)
-- | --
10000 | 10802
100000 | 100240
1000000 | 922061
For verifying compaction read sizes: `strace -fye pread64 ./db_bench -benchmarks=compact -use_existing_db=true -rate_limiter_bytes_per_sec=67108864 -rate_limiter_refill_period_us=$refill_micros -rate_limiter_single_burst_bytes=16777216 -rate_limit_bg_reads=true -compaction_readahead_size=16777216 -use_direct_reads=true`
Reviewed By: hx235
Differential Revision: D54165675
Pulled By: ajkr
fbshipit-source-id: c5968486316cbfb7ff8e5b7d75d3589883dd1105
Summary:
Enabling time PerfCounter stats in RocksDB is currently very expensive, as it enables all sorts of relatively uninteresting stats, such as iteration, point lookup breakdown etc. This PR adds a new perf level between `kEnableCount` and `kEnableTimeExceptForMutex` to enable stats for time spent by user (i.e a RocksDB user) threads blocked by other RocksDB threads or events, such as a write group leader, write delay or stalls etc. It does not include time spent waiting to acquire mutexes, or waiting for IO.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12368
Test Plan: Add a unit test for write_thread_wait_nanos
Reviewed By: ajkr
Differential Revision: D54021583
Pulled By: anand1976
fbshipit-source-id: 3f6fcf71010132ffffca0391a5565f3b59fddd48
Summary:
This PR expands on the capabilities added in https://github.com/facebook/rocksdb/issues/12343. It adds sanity checks for external file's comparator name and user-defined timestamps related flag. With this, it now supports ingesting files to a column family that enables user-defined timestamps in Memtable only feature.
Two fields in the table properties are used for aformentioned check: 1) the comparator name, it records what comparator is used to create this external sst file, 2) the flag `user_defined_timestamps_persisted`. We compare these two fields with the column family's settings. The details are in util function `ValidateUserDefinedTimestampsOptions`.
To optimize for the majority of the cases where sanity check should pass and the table properties read should not affect how `TableReader` is constructed, instead of read the table properties block separately and use it for sanity check before creating a `TableReader`. We continue using the current flow to first create a `TableReader`, use it for reading table properties and do sanity checks, and reset the`TableReader` for the case where the column family enables UDTs in memtable only feature, and the external file does not contain user-defined timestamps.
This PR also groups other table properties related sanity check in function `GetIngestedFileInfo` into the newly added `SanityCheckTableProperties` function.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12356
Test Plan:
added unit test
existing unit test
Reviewed By: cbi42
Differential Revision: D54025116
Pulled By: jowlyzhang
fbshipit-source-id: a918276c15f9908bd9df8513ce667638882e1554
Summary:
This occasional filesystem read in the write path has caused user pain. It doesn't seem very useful considering it only limits one component's merge chain length, and only helps merge uncached (i.e., infrequently read) values. This PR proposes allowing `max_successive_merges` to be exceeded when the value cannot be read from in-memory components. I included a rollback flag (`strict_max_successive_merges`) just in case.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12365
Test Plan:
"rocksdb.block.cache.data.add" is number of data blocks read from filesystem. Since the benchmark is write-only, compaction is disabled, and flush doesn't read data blocks, any nonzero value means the user write issued the read.
```
$ for s in false true; do echo -n "strict_max_successive_merges=$s: " && ./db_bench -value_size=64 -write_buffer_size=131072 -writes=128 -num=1 -benchmarks=mergerandom,flush,mergerandom -merge_operator=stringappend -disable_auto_compactions=true -compression_type=none -strict_max_successive_merges=$s -max_successive_merges=100 -statistics=true |& grep 'block.cache.data.add COUNT' ; done
strict_max_successive_merges=false: rocksdb.block.cache.data.add COUNT : 0
strict_max_successive_merges=true: rocksdb.block.cache.data.add COUNT : 1
```
Reviewed By: hx235
Differential Revision: D53982520
Pulled By: ajkr
fbshipit-source-id: e40f761a60bd601f232417ac0058e4a33ee9c0f4
Summary:
with release notes for 9.0.fb, format_compatible test update, and version.h update.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12360
Test Plan: CI
Reviewed By: cbi42
Differential Revision: D53879416
Pulled By: jowlyzhang
fbshipit-source-id: 29598893d9ce2d0bb181345ddb78f9b1529aee75
Summary:
A lot of variants of Get and MultiGet have been added to `include/rocksdb/db.h` over the years. Try to consolidate them by marking variants that don't return timestamps as deprecated. The underlying DB implementation will check and return Status::NotSupported() if it doesn't support returning timestamps and the caller asks for it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12327
Reviewed By: pdillinger
Differential Revision: D53828151
Pulled By: anand1976
fbshipit-source-id: e0b5ca42d32daa2739d5f439a729815a2d4ff050
Summary:
It's in production for a large storage service, and it was initially released 6 months ago (8.6.0). IMHO that's enough room for "easy downgrade" to most any user's previously integrated version, even if they only update a few times a year.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12352
Test Plan:
tests updated, including format capatibility test
table_test: ApproximateOffsetOfCompressed is affected because adding index block to metaindex adds about 13 bytes
to SST files in format_version 6. This test has historically been problematic and one reason is that, apparently, not only
could it pass/fail depending on snappy compression version, but also how long your host name is, because of db_host_id.
I've cleared that out for the test, which takes care of format_version=6 and hopefully improves long-term reliability.
Suggested follow-up: FinishImpl in table_test.cc takes a table_options that is ignored in some cases and might not match
the ioptions.table_factory configuration unless the caller is very careful. This should be cleaned up somehow.
Reviewed By: anand1976
Differential Revision: D53786884
Pulled By: pdillinger
fbshipit-source-id: 1964cbd40d3ab0a821fdc01c458031df716fcf51
Summary:
.. for public api change related to sst_dump.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12353
Reviewed By: jaykorean
Differential Revision: D53791123
Pulled By: cbi42
fbshipit-source-id: 3fbe9c7a3eb0a30dc1a00d39bc8a46028baa3779
Summary:
This PR adds support in `SstFileWriter` to create SST files without persisting timestamps when the column family has enabled UDTs in Memtable only feature. The sst files created from flush and compaction do not contain timestamps, we want to make the sst files created by `SstFileWriter` to follow the same pattern and not persist timestamps. This is to prepare for ingesting external SST files for this type of column family.
There are timestamp-aware APIs and non timestamp-aware APIs in `SstFileWriter`. The former are exclusively used for when the column family's comparator is timestamp-aware, a.k.a `Comparator::timestamp_size() > 0`, while the latter are exclusively used for the column family's comparator is non timestamp-aware, a.k.a `Comparator::timestamp_size() == 0`. There are sanity checks to make sure these APIs are correctly used.
In this PR, the APIs usage continue with above enforcement, where even though timestamps are not eventually persisted, users are still asked to use only the timestamp-aware APIs. But because data points will logically all have minimum timestamps, we don't allow multiple versions of the same user key (without timestamp) to be added.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12348
Test Plan:
Added unit tests
Manual inspection of generated sst files with `sst_dump`
Reviewed By: ltamasi
Differential Revision: D53732667
Pulled By: jowlyzhang
fbshipit-source-id: e43beba0d3a1736b94ee5c617163a6280efd65b7
Summary:
There is no strong reason for user to need this mode while on the other hand, its behavior is destructive.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12337
Reviewed By: hx235
Differential Revision: D53630393
Pulled By: jowlyzhang
fbshipit-source-id: ce94b537258102cd98f89aa4090025663664dd78
Yu Zhang