KAFKA-16226; Reduce synchronization between producer threads (#15323) #15493
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…15323) As this [JIRA](https://issues.apache.org/jira/browse/KAFKA-16226) explains, there is increased synchronization between application-thread, and the background thread as the background thread started to synchronized methods Metadata.currentLeader() in [original PR](apache#14384). So this PR does the following changes 1. Changes background thread, i.e. RecordAccumulator's partitionReady(), and drainBatchesForOneNode(), to not use `Metadata.currentLeader()`. Instead rely on `MetadataCache` that is immutable. So access to it is unsynchronized. 2. This PR repurposes `MetadataCache` as an immutable snapshot of Metadata. This is a wrapper around public `Cluster`. `MetadataCache`'s API/functionality should be extended for internal client usage Vs public `Cluster`. For example, this PR adds `MetadataCache.leaderEpochFor()` 3. Rename `MetadataCache` to `MetadataSnapshot` to make it explicit its immutable. **Note both `Cluster` and `MetadataCache` are not syncronized, hence reduce synchronization from the hot path for high partition counts.** Reviewers: Jason Gustafson <jason@confluent.io>
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@hachikuji / @ijuma can you help in merging this? The test failures on jenkins are flaky and unrelated. |
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Test failures are the same as the 3.7 branch. |
ijuma
approved these changes
Mar 14, 2024
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@ijuma thanks! |
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NOTE this cherry-picks fix #14522 into 3.7
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