9.3.0 release notes

HISTORY.md

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 # Rocksdb Change Log
 > NOTE: Entries for next release do not go here. Follow instructions in `unreleased_history/README.txt`
 
+## 9.3.0 (05/17/2024)
+### New Features
+* Optimistic transactions and pessimistic transactions with the WriteCommitted policy now support the `GetEntity` API.
+* Added new `Iterator` property, "rocksdb.iterator.is-value-pinned", for checking whether the `Slice` returned by `Iterator::value()` can be used until the `Iterator` is destroyed.
+* Optimistic transactions and WriteCommitted pessimistic transactions now support the `MultiGetEntity` API.
+* Optimistic transactions and pessimistic transactions with the WriteCommitted policy now support the `PutEntity` API. Support for read APIs and other write policies (WritePrepared, WriteUnprepared) will be added later.
+
+### Public API Changes
+* Exposed block based metadata cache options via C API
+* Exposed compaction pri via c api.
+* Add a kAdmPolicyAllowAll option to TieredAdmissionPolicy that admits all blocks evicted from the primary block cache into the compressed secondary cache.
+
+### Behavior Changes
+* CompactRange() with change_level=true on a CF with FIFO compaction will return Status::NotSupported().
+* External file ingestion with FIFO compaction will always ingest to L0.
+
+### Bug Fixes
+* Fixed a bug for databases using `DBOptions::allow_2pc == true` (all `TransactionDB`s except `OptimisticTransactionDB`) that have exactly one column family. Due to a missing WAL sync, attempting to open the DB could have returned a `Status::Corruption` with a message like "SST file is ahead of WALs".
+* Fix a bug in CreateColumnFamilyWithImport() where if multiple CFs are imported, we were not resetting files' epoch number and L0 files can have overlapping key range but the same epoch number.
+* Fixed race conditions when `ColumnFamilyOptions::inplace_update_support == true` between user overwrites and reads on the same key.
+
 ## 9.2.0 (05/01/2024)
 ### New Features
 * Added two options `deadline` and `max_size_bytes` for CacheDumper to exit early

unreleased_history/behavior_changes/fifo-compact-range.md

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-* CompactRange() with change_level=true on a CF with FIFO compaction will return Status::NotSupported(). 

unreleased_history/behavior_changes/fifo-ingestion.md

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-* External file ingestion with FIFO compaction will always ingest to L0.

unreleased_history/bug_fixes/2pc_wal_sync.md

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-* Fixed a bug for databases using `DBOptions::allow_2pc == true` (all `TransactionDB`s except `OptimisticTransactionDB`) that have exactly one column family. Due to a missing WAL sync, attempting to open the DB could have returned a `Status::Corruption` with a message like "SST file is ahead of WALs".

unreleased_history/bug_fixes/fix-import-epoch.md

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-* Fix a bug in CreateColumnFamilyWithImport() where if multiple CFs are imported, we were not resetting files' epoch number and L0 files can have overlapping key range but the same epoch number.

unreleased_history/bug_fixes/inplace_update_race.md

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-* Fixed race conditions when `ColumnFamilyOptions::inplace_update_support == true` between user overwrites and reads on the same key.

unreleased_history/new_features/get_entity_txn.md

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-Optimistic transactions and pessimistic transactions with the WriteCommitted policy now support the `GetEntity` API.

unreleased_history/new_features/iterator_property_value_pinned.md

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-* Added new `Iterator` property, "rocksdb.iterator.is-value-pinned", for checking whether the `Slice` returned by `Iterator::value()` can be used until the `Iterator` is destroyed.

unreleased_history/new_features/multi_get_entity_txn.md

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-Optimistic transactions and WriteCommitted pessimistic transactions now support the `MultiGetEntity` API.

unreleased_history/new_features/put_entity_txn.md

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-Optimistic transactions and pessimistic transactions with the WriteCommitted policy now support the `PutEntity` API. Support for read APIs and other write policies (WritePrepared, WriteUnprepared) will be added later.

unreleased_history/public_api_changes/expose_block_based_metadata_cache_options_via_c_api.md

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-Exposed block based metadata cache options via C API

unreleased_history/public_api_changes/expose_compaction_pri_via_c_api.md

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-Exposed compaction pri via c api.

unreleased_history/public_api_changes/sec_cache_allow_all.md

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-Add a kAdmPolicyAllowAll option to TieredAdmissionPolicy that admits all blocks evicted from the primary block cache into the compressed secondary cache.