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Posted to jira@kafka.apache.org by "Robert Wagner (Jira)" <ji...@apache.org> on 2020/09/08 17:02:00 UTC

[jira] [Created] (KAFKA-10470) zstd decompression with small batches is slow and causes excessive GC

Robert Wagner created KAFKA-10470:
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             Summary: zstd decompression with small batches is slow and causes excessive GC
                 Key: KAFKA-10470
                 URL: https://issues.apache.org/jira/browse/KAFKA-10470
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 2.5.1
            Reporter: Robert Wagner


Similar to KAFKA-5150 but for zstd instead of LZ4, it appears that a large decompression buffer (128kb) created by zstd-jni per batch is causing a significant performance bottleneck.

The next upcoming version of zstd-jni (1.4.5-7) will have a new constructor for ZstdInputStream that allows the client to pass its own buffer.  A similar fix as [PR #2967|https://github.com/apache/kafka/pull/2967] could be used to have the  ZstdConstructor use a BufferSupplier to re-use the decompression buffer.



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