From 682fc8ba6a2f768582fde4ba88f200c02a76bcb3 Mon Sep 17 00:00:00 2001 From: Peter Dillinger Date: Tue, 19 Apr 2022 16:44:05 -0700 Subject: [PATCH] Release note for #9546 (#9872) Summary: We don't really have a mechanism for internal-only release notes, so adding this to the standard release notes. For picking into 7.2 release. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9872 Test Plan: release note only Reviewed By: jay-zhuang Differential Revision: D35761307 Pulled By: pdillinger fbshipit-source-id: 5d1932767fff48456323df948604dbb956ac27b2 --- HISTORY.md | 1 + 1 file changed, 1 insertion(+) diff --git a/HISTORY.md b/HISTORY.md index 06cbc6307..653b2b04e 100644 --- a/HISTORY.md +++ b/HISTORY.md @@ -22,6 +22,7 @@ * Added a dedicated integer DB property `rocksdb.live-blob-file-garbage-size` that exposes the total amount of garbage in the blob files in the current version. * RocksDB does internal auto prefetching if it notices sequential reads. It starts with readahead size `initial_auto_readahead_size` which now can be configured through BlockBasedTableOptions. * Add a merge operator that allows users to register specific aggregation function so that they can does aggregation using different aggregation types for different keys. See comments in include/rocksdb/utilities/agg_merge.h for actual usage. The feature is experimental and the format is subject to change and we won't provide a migration tool. +* Meta-internal / Experimental: Improve CPU performance by replacing many uses of std::unordered_map with folly::F14FastMap when RocksDB is compiled together with Folly. ### Behavior changes * Disallow usage of commit-time-write-batch for write-prepared/write-unprepared transactions if TransactionOptions::use_only_the_last_commit_time_batch_for_recovery is false to prevent two (or more) uncommitted versions of the same key in the database. Otherwise, bottommost compaction may violate the internal key uniqueness invariant of SSTs if the sequence numbers of both internal keys are zeroed out (#9794).