Commit Graph

78 Commits

Author SHA1 Message Date
Yi Wu 5a2a6483dc Blob DB: Inline small values in base DB
Summary:
Adding the `min_blob_size` option to allow storing small values in base db (in LSM tree) together with the key. The goal is to improve performance for small values, while taking advantage of blob db's low write amplification for large values.

Also adding expiration timestamp to blob index. It will be useful to evict stale blob indexes in base db by adding a compaction filter. I'll work on the compaction filter in future patches.

See blob_index.h for the new blob index format. There are 4 cases when writing a new key:
* small value w/o TTL: put in base db as normal value (i.e. ValueType::kTypeValue)
* small value w/ TTL: put (type, expiration, value) to base db.
* large value w/o TTL: write value to blob log and put (type, file, offset, size, compression) to base db.
* large value w/TTL: write value to blob log and put (type, expiration, file, offset, size, compression) to base db.
Closes https://github.com/facebook/rocksdb/pull/3066

Differential Revision: D6142115

Pulled By: yiwu-arbug

fbshipit-source-id: 9526e76e19f0839310a3f5f2a43772a4ad182cd0
2017-10-26 12:30:54 -07:00
Sagar Vemuri 96e3a600ba Return write error on reaching blob dir size limit
Summary:
I found that we continue accepting writes even when the blob db goes beyond the configured blob directory size limit. Now, we return an error for writes on reaching `blob_dir_size` limit and if `is_fifo` is set to false. (We cannot just drop any file when `is_fifo` is true.)

Deleting the oldest file when `is_fifo` is true will be handled in a later PR.
Closes https://github.com/facebook/rocksdb/pull/3060

Differential Revision: D6136156

Pulled By: sagar0

fbshipit-source-id: 2f11cb3f2eedfa94524fbfa2613dd64bfad7a23c
2017-10-25 16:30:37 -07:00
Yi Wu 66a2c44ef4 Add DB::Properties::kEstimateOldestKeyTime
Summary:
With FIFO compaction we would like to get the oldest data time for monitoring. The problem is we don't have timestamp for each key in the DB. As an approximation, we expose the earliest of sst file "creation_time" property.

My plan is to override the property with a more accurate value with blob db, where we actually have timestamp.
Closes https://github.com/facebook/rocksdb/pull/2842

Differential Revision: D5770600

Pulled By: yiwu-arbug

fbshipit-source-id: 03833c8f10bbfbee62f8ea5c0d03c0cafb5d853a
2017-10-23 15:27:27 -07:00
Yi Wu eaaef91178 Blob DB: Store blob index as kTypeBlobIndex in base db
Summary:
Blob db insert blob index to base db as kTypeBlobIndex type, to tell apart values written by plain rocksdb or blob db. This is to make it possible to migrate from existing rocksdb to blob db.

Also with the patch blob db garbage collection get away from OptimisticTransaction. Instead it use a custom write callback to achieve similar behavior as OptimisticTransaction. This is because we need to pass the is_blob_index flag to DBImpl::Get but OptimisticTransaction don't support it.
Closes https://github.com/facebook/rocksdb/pull/3000

Differential Revision: D6050044

Pulled By: yiwu-arbug

fbshipit-source-id: 61dc72ab9977625e75f78cd968e7d8a3976e3632
2017-10-17 17:28:11 -07:00
Yi Wu 0552029b5c Blob DB: not writing sequence number as blob record footer
Summary:
Previously each time we write a blob we write blog_record_header + key + value + blob_record_footer to blob log. The footer only contains a sequence and a crc for the sequence number. The sequence number was used in garbage collection to verify the value is recent. After #2703 we moved to use optimistic transaction and no longer use sequence number from the footer. Remove the footer altogether.

There's another usage of sequence number and we are keeping it: Each blob log file keep track of sequence number range of keys in it, and use it to check if it is reference by a snapshot, before being deleted.
Closes https://github.com/facebook/rocksdb/pull/3005

Differential Revision: D6057585

Pulled By: yiwu-arbug

fbshipit-source-id: d6da53c457a316e9723f359a1b47facfc3ffe090
2017-10-17 12:13:08 -07:00
Zhongyi Xie e2548366e1 add GetLiveFiles and GetLiveFilesMetaData for BlobDB
Summary: Closes https://github.com/facebook/rocksdb/pull/2976

Differential Revision: D5994759

Pulled By: miasantreble

fbshipit-source-id: 985c31dccb957cb970c302f813cd07a1e8cb6438
2017-10-09 19:56:04 -07:00
Yi Wu dcd36a6aee Make it explicit blob db doesn't support CF
Summary:
Blob db doesn't currently support column families. Return NotSupported status explicitly.
Closes https://github.com/facebook/rocksdb/pull/2825

Differential Revision: D5757438

Pulled By: yiwu-arbug

fbshipit-source-id: 44de9408fd032c98e8ae337d4db4ed37169bd9fa
2017-09-08 11:11:04 -07:00
Yi Wu 503db684f7 make blob file close synchronous
Summary:
Fixing flaky blob_db_test.

To close a blob file, blob db used to add a CloseSeqWrite job to the background thread to close it. Changing file close to be synchronous in order to simplify logic, and fix flaky blob_db_test.
Closes https://github.com/facebook/rocksdb/pull/2787

Differential Revision: D5699387

Pulled By: yiwu-arbug

fbshipit-source-id: dd07a945cd435cd3808fce7ee4ea57817409474a
2017-08-25 10:41:49 -07:00
yiwu-arbug 5b68b114f1 Blob db create a snapshot before every read
Summary:
If GC kicks in between

* A Get() reads index entry from base db.
* The Get() read from a blob file

The GC can delete the corresponding blob file, making the key not found. Fortunately we have existing logic to avoid deleting a blob file if it is referenced by a snapshot. So the fix is to explicitly create a snapshot before reading index entry from base db.
Closes https://github.com/facebook/rocksdb/pull/2754

Differential Revision: D5655956

Pulled By: yiwu-arbug

fbshipit-source-id: e4ccbc51331362542e7343175bbcbdea5830f544
2017-08-20 18:26:19 -07:00
yiwu-arbug 4624ae52c9 GC the oldest file when out of space
Summary:
When out of space, blob db should GC the oldest file. The current implementation GC the newest one instead. Fixing it.
Closes https://github.com/facebook/rocksdb/pull/2757

Differential Revision: D5657611

Pulled By: yiwu-arbug

fbshipit-source-id: 56c30a4c52e6ab04551dda8c5c46006d4070b28d
2017-08-20 17:11:06 -07:00
follitude ac8fb77afd fix some misspellings
Summary:
PTAL ajkr
Closes https://github.com/facebook/rocksdb/pull/2750

Differential Revision: D5648052

Pulled By: ajkr

fbshipit-source-id: 7cd1ddd61364d5a55a10fdd293fa74b2bf89dd98
2017-08-16 21:57:20 -07:00
yiwu-arbug e5a1b727c0 Fix blob DB transaction usage while GC
Summary:
While GC, blob DB use optimistic transaction to delete or replace the index entry in LSM, to guarantee correctness if there's a normal write writing to the same key. However, the previous implementation doesn't call SetSnapshot() nor use GetForUpdate() of transaction API, instead it do its own sequence number checking before beginning the transaction. A normal write can sneak in after the sequence number check and overwrite the key, and the GC will delete or relocate the old version of the key by mistake. Update the code to property use GetForUpdate() to check the existing index entry.

After the patch the sequence number store with each blob record is useless, So I'm considering remove the sequence number from blob record, in another patch.
Closes https://github.com/facebook/rocksdb/pull/2703

Differential Revision: D5589178

Pulled By: yiwu-arbug

fbshipit-source-id: 8dc960cd5f4e61b36024ba7c32d05584ce149c24
2017-08-11 12:43:17 -07:00
Yi Wu 92afe830f9 Update all blob db TTL and timestamps to uint64_t
Summary:
The current blob db implementation use mix of int32_t, uint32_t and uint64_t for TTL and expiration. Update all timestamps to uint64_t for consistency.
Closes https://github.com/facebook/rocksdb/pull/2683

Differential Revision: D5557103

Pulled By: yiwu-arbug

fbshipit-source-id: e4eab2691629a755e614e8cf1eed9c3a681d0c42
2017-08-03 17:57:30 -07:00
Yi Wu 0b814ba92d Allow concurrent writes to blob db
Summary:
I'm going with brute-force solution, just letting Put() and Write() holding a mutex before writing. May improve concurrent writing with finer granularity locking later.
Closes https://github.com/facebook/rocksdb/pull/2682

Differential Revision: D5552690

Pulled By: yiwu-arbug

fbshipit-source-id: 039abd675b5d274a7af6428198d1733cafecef4c
2017-08-03 15:11:26 -07:00
Yi Wu 2c45ada4c4 Blob DB garbage collection should keep keys with newer version
Summary:
Fix the bug where if blob db garbage collection revmoe keys with newer version. It shouldn't delete the key from base db when sequence number in base db is not equal to the one in blob log.
Closes https://github.com/facebook/rocksdb/pull/2678

Differential Revision: D5549752

Pulled By: yiwu-arbug

fbshipit-source-id: abb8649260963b5c389748023970fd746279d227
2017-08-03 13:12:12 -07:00
Yi Wu 1900771bd2 Dump Blob DB options to info log
Summary:
* Dump blob db options to info log
* Remove BlobDBOptionsImpl to disallow dynamic cast *BlobDBOptions into *BlobDBOptionsImpl. Move options there to be constants or into BlobDBOptions. The dynamic cast is broken after #2645
* Change some of the default options
* Remove blob_db_options.min_blob_size, which is unimplemented. Will implement it soon.
Closes https://github.com/facebook/rocksdb/pull/2671

Differential Revision: D5529912

Pulled By: yiwu-arbug

fbshipit-source-id: dcd58ca981db5bcc7f123b65a0d6f6ae0dc703c7
2017-08-01 13:01:47 -07:00
Yi Wu 6083bc79f8 Blob DB TTL extractor
Summary:
Introducing blob_db::TTLExtractor to replace extract_ttl_fn. The TTL
extractor can be use to extract TTL from keys insert with Put or
WriteBatch. Change over existing extract_ttl_fn are:
* If value is changed, it will be return via std::string* (rather than Slice*). With Slice* the new value has to be part of the existing value. With std::string* the limitation is removed.
* It can optionally return TTL or expiration.

Other changes in this PR:
* replace `std::chrono::system_clock` with `Env::NowMicros` so that I can mock time in tests.
* add several TTL tests.
* other minor naming change.
Closes https://github.com/facebook/rocksdb/pull/2659

Differential Revision: D5512627

Pulled By: yiwu-arbug

fbshipit-source-id: 0dfcb00d74d060b8534c6130c808e4d5d0a54440
2017-07-27 23:26:04 -07:00
Siying Dong 3c327ac2d0 Change RocksDB License
Summary: Closes https://github.com/facebook/rocksdb/pull/2589

Differential Revision: D5431502

Pulled By: siying

fbshipit-source-id: 8ebf8c87883daa9daa54b2303d11ce01ab1f6f75
2017-07-15 16:11:23 -07:00
foolenough 21b17d7686 Fix BlobDB::Get which only get out the value offset
Summary:
Blob db use StackableDB::get which only get out the
value offset, but not the value.
Fix by making BlobDB::Get override the designated getter.
Closes https://github.com/facebook/rocksdb/pull/2553

Differential Revision: D5396823

Pulled By: yiwu-arbug

fbshipit-source-id: 5a7d1cf77ee44490f836a6537225955382296878
2017-07-12 17:57:40 -07:00
Siying Dong 18c63af6ef Make "make analyze" happy
Summary:
"make analyze" is reporting some errors. It's complicated to look but it seems to me that they are all false positive. Anyway, I think cleaning them up is a good idea. Some of the changes are hacky but I don't know a better way.
Closes https://github.com/facebook/rocksdb/pull/2508

Differential Revision: D5341710

Pulled By: siying

fbshipit-source-id: 6070e430e0e41a080ef441e05e8ec827d45efab6
2017-06-28 15:42:27 -07:00
Dmitri Smirnov a21db161c9 Implement ReopenWritibaleFile on Windows and other fixes
Summary:
Make default impl return NoSupported so the db_blob
  tests exist in a meaningful manner.
  Replace std::thread to port::Thread
Closes https://github.com/facebook/rocksdb/pull/2465

Differential Revision: D5275563

Pulled By: yiwu-arbug

fbshipit-source-id: cedf1a18a2c05e20d768c1308b3f3224dbd70ab6
2017-06-20 10:31:13 -07:00
Yi Wu ae8571f5c2 Fix blob db compression bug
Summary:
`CompressBlock()` will return the uncompressed slice (i.e. `Slice(value_unc)`) if compression ratio is not good enough. This is undesired. We need to always assign the compressed slice to `value`.
Closes https://github.com/facebook/rocksdb/pull/2447

Differential Revision: D5244682

Pulled By: yiwu-arbug

fbshipit-source-id: 6989dd8852c9622822ba9acec9beea02007dff09
2017-06-14 13:56:42 -07:00
Yi Wu 7a380deff7 Update blob_db_test
Summary:
I'm trying to improve unit test of blob db. I'm rewriting blob db test. In this patch:
* Rewrite tests of basic put/write/delete operations.
* Add disable_background_tasks to BlobDBOptionsImpl to allow me not running any background job for basic unit tests.
* Move DestroyBlobDB out from BlobDBImpl to be a standalone function.
* Remove all garbage collection related tests. Will rewrite them in following patch.
* Disabled compression test since it is failing. Will fix in a followup patch.
Closes https://github.com/facebook/rocksdb/pull/2446

Differential Revision: D5243306

Pulled By: yiwu-arbug

fbshipit-source-id: 157c71ad3b699307cb88baa3830e9b6e74f8e939
2017-06-14 13:12:34 -07:00
Yi Wu 91e2aa3ce2 write exact sequence number for each put in write batch
Summary:
At the beginning of write batch write, grab the latest sequence from base db and assume sequence number will increment by 1 for each put and delete, and write the exact sequence number with each put. This is assuming we are the only writer to increment sequence number (no external file ingestion, etc) and there should be no holes in the sequence number.

Also having some minor naming changes.
Closes https://github.com/facebook/rocksdb/pull/2402

Differential Revision: D5176134

Pulled By: yiwu-arbug

fbshipit-source-id: cb4712ee44478d5a2e5951213a10b72f08fe8c88
2017-06-13 12:42:36 -07:00
Yi Wu ad19eb8686 Fixing blob db sequence number handling
Summary:
Blob db rely on base db returning sequence number through write batch after DB::Write(). However after recent changes to the write path, DB::Writ()e no longer return sequence number in some cases. Fixing it by have WriteBatchInternal::InsertInto() always encode sequence number into write batch.

Stacking on #2375.
Closes https://github.com/facebook/rocksdb/pull/2385

Differential Revision: D5148358

Pulled By: yiwu-arbug

fbshipit-source-id: 8bda0aa07b9334ed03ed381548b39d167dc20c33
2017-05-31 10:56:45 -07:00
Yi Wu 345878a7fb update blob_db_test
Summary:
Re-enable blob_db_test with some update:
* Commented out delay at the end of GC tests. Will update the logic later with sync point to properly trigger GC.
* Added some helper functions.

Also update make files to include blob_dump tool.
Closes https://github.com/facebook/rocksdb/pull/2375

Differential Revision: D5133793

Pulled By: yiwu-arbug

fbshipit-source-id: 95470b26d0c1f9592ba4b7637e027fdd263f425c
2017-05-30 22:26:13 -07:00
Anirban Rahut d85ff4953c Blob storage pr
Summary:
The final pull request for Blob Storage.
Closes https://github.com/facebook/rocksdb/pull/2269

Differential Revision: D5033189

Pulled By: yiwu-arbug

fbshipit-source-id: 6356b683ccd58cbf38a1dc55e2ea400feecd5d06
2017-05-10 15:14:44 -07:00
sdong 8b79422b52 [Proof-Of-Concept] RocksDB Blob Storage with a blob log file.
Summary:
This is a proof of concept of a RocksDB blob log file. The actual value of the Put() is appended to a blob log using normal data block format, and the handle of the block is written as the value of the key in RocksDB.

The prototype only supports Put() and Get(). It doesn't support DB restart, garbage collection, Write() call, iterator, snapshots, etc.

Test Plan: Add unit tests.

Reviewers: arahut

Reviewed By: arahut

Subscribers: kradhakrishnan, leveldb, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D61485
2016-08-10 17:05:17 -07:00