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https://issues.apache.org/jira/browse/LUCENE-10657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-10657.
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Fix Version/s: 9.3
Resolution: Fixed
> CopyBytes now saves one memory copy on ByteBuffersDataOutput
> ------------------------------------------------------------
>
> Key: LUCENE-10657
> URL: https://issues.apache.org/jira/browse/LUCENE-10657
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/store
> Reporter: LuYunCheng
> Priority: Major
> Fix For: 9.3
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> This is derived from
> [LUCENE-10627|[https://github.com/apache/lucene/pull/987]]
> Code: [https://github.com/apache/lucene/pull/1034]
> The abstract method `copyBytes` in DataOutput have to copy from input to a
> copyBuffer and then write into ByteBuffersDataOutput.blocks, i think there is
> unnecessary, we can override it, copy directly from input into output.
> with override this method,
> # Reduce memory copy in `Lucene90CompressingStoredFieldsWriter#copyOneDoc`
> -> `bufferdDocs.copyBytes(DataInput input)`
> # Reduce memory copy in `Lucene90CompoundFormat.writeCompoundFile` ->
> `data.copyBytes` when input is `BufferedChecksumIndexinput` and output is
> `ByteBuffersDataOutput`
> # Reduce memory `IndexWriter#copySegmentAsIs` ->CopyFrom -> copyBytes
>
>
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