LuYunCheng created LUCENE-10657:
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Summary: Reduce memory copy in DataOutput copyBytes
Key: LUCENE-10657
URL: https://issues.apache.org/jira/browse/LUCENE-10657
Project: Lucene - Core
Issue Type: Improvement
Components: core/store
Reporter: LuYunCheng
This is derived from
[LUCENE-10627|[https://github.com/apache/lucene/pull/987]|https://github.com/apache/lucene/pull/987].]
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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