update HISTORY.md for 9.4.fb

facebook · Jun 24, 2024 · 08d85c6 · 08d85c6
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 # Rocksdb Change Log
 > NOTE: Entries for next release do not go here. Follow instructions in `unreleased_history/README.txt`
 
+## 9.4.0 (06/23/2024)
+### New Features
+* Added a `CompactForTieringCollectorFactory` to auto trigger compaction for tiering use case.
+* Optimistic transactions and pessimistic transactions with the WriteCommitted policy now support the `GetEntityForUpdate` API.
+* Added a new "count" command to the ldb repl shell. By default, it prints a count of keys in the database from start to end. The options --from=<key> and/or --to=<key> can be specified to limit the range.
+* Add `rocksdb_writebatch_update_timestamps`, `rocksdb_writebatch_wi_update_timestamps` in C API.
+* Add `rocksdb_iter_refresh` in C API.
+* Add `rocksdb_writebatch_create_with_params`, `rocksdb_writebatch_wi_create_with_params` to create WB and WBWI with all options in C API
+
+### Public API Changes
+* Deprecated names `LogFile` and `VectorLogPtr` in favor of new names `WalFile` and `VectorWalPtr`.
+* Introduce a new universal compaction option CompactionOptionsUniversal::max_read_amp which allows user to define the limit on the number of sorted runs separately from the trigger for compaction (`level0_file_num_compaction_trigger`) #12477.
+
+### Behavior Changes
+* Inactive WALs are immediately closed upon being fully sync-ed rather than in a background thread. This is to ensure LinkFile() is not called on files still open for write, which might not be supported by some FileSystem implementations. This should not be a performance issue, but an opt-out is available with with new DB option `background_close_inactive_wals`.
+
+### Bug Fixes
+* Fix a rare case in which a hard-linked WAL in a Checkpoint is not fully synced (so might lose data on power loss).
+* Fixed the output of the `ldb dump_wal` command for `PutEntity` records so it prints the key and correctly resets the hexadecimal formatting flag after printing the wide-column entity.
+* Fixed an issue where `PutEntity` records were handled incorrectly while rebuilding transactions during recovery.
+* Various read operations could ignore various ReadOptions that might be relevant. Fixed many such cases, which can result in behavior change but a better reflection of specified options.
+
+### Performance Improvements
+* Improved write throughput to memtable when there's a large number of concurrent writers and allow_concurrent_memtable_write=true(#12545)
+
 ## 9.3.0 (05/17/2024)
 ### New Features
 * Optimistic transactions and pessimistic transactions with the WriteCommitted policy now support the `GetEntity` API.

diff --git a/unreleased_history/behavior_changes/aggressive_close_inactive_wals.md b/unreleased_history/behavior_changes/aggressive_close_inactive_wals.md
diff --git a/unreleased_history/bug_fixes/checkpoint_unsynced_wal_fix.md b/unreleased_history/bug_fixes/checkpoint_unsynced_wal_fix.md
diff --git a/unreleased_history/bug_fixes/ldb_dump_wal_put_entity.md b/unreleased_history/bug_fixes/ldb_dump_wal_put_entity.md
diff --git a/unreleased_history/bug_fixes/put_entity_rebuild_txn.md b/unreleased_history/bug_fixes/put_entity_rebuild_txn.md
diff --git a/unreleased_history/bug_fixes/read_options.md b/unreleased_history/bug_fixes/read_options.md
diff --git a/unreleased_history/new_features/auto_trigger_compaction_for_tiering.md b/unreleased_history/new_features/auto_trigger_compaction_for_tiering.md
diff --git a/unreleased_history/new_features/get_entity_for_update.md b/unreleased_history/new_features/get_entity_for_update.md
diff --git a/unreleased_history/new_features/ldb_count_command.md b/unreleased_history/new_features/ldb_count_command.md
diff --git a/unreleased_history/new_features/write_batch_c_api b/unreleased_history/new_features/write_batch_c_api
diff --git a/...performance_improvements/parallel_notify-one_i_LaunchParallelMemTableWriters.md b/...performance_improvements/parallel_notify-one_i_LaunchParallelMemTableWriters.md
diff --git a/unreleased_history/public_api_changes/rename_to_wal_file.md b/unreleased_history/public_api_changes/rename_to_wal_file.md
diff --git a/unreleased_history/public_api_changes/universal_max_read_amp.md b/unreleased_history/public_api_changes/universal_max_read_amp.md