[jira] [Resolved] (HBASE-23107) Avoid temp byte array creation when doing cacheDataOnWrite

["Zheng Hu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-23107?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zheng Hu resolved HBASE-23107.
------------------------------
    Hadoop Flags: Reviewed
      Resolution: Fixed

Pushed to branch-2 & master,  Thanks [~javaman_chen] for contributing  , and thanks all for reviewing & feedback.

> Avoid temp byte array creation when doing cacheDataOnWrite
> ----------------------------------------------------------
>
>                 Key: HBASE-23107
>                 URL: https://issues.apache.org/jira/browse/HBASE-23107
>             Project: HBase
>          Issue Type: Improvement
>          Components: BlockCache, HFile
>            Reporter: chenxu
>            Assignee: chenxu
>            Priority: Major
>              Labels: gc
>             Fix For: 3.0.0, 2.3.0
>
>         Attachments: flamegraph_after.svg, flamegraph_before.svg
>
>
> code in HFileBlock.Writer.cloneUncompressedBufferWithHeader
> {code:java}
> ByteBuffer cloneUncompressedBufferWithHeader() {
>   expectState(State.BLOCK_READY);
>   byte[] uncompressedBlockBytesWithHeader = baosInMemory.toByteArray();
>   …
> }
> {code}
> When cacheOnWrite feature enabled, a temp byte array was created in order to copy block’s data, we can avoid this by use of ByteBuffAllocator. This can improve GC performance in write heavy scenarios.



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