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https://issues.apache.org/jira/browse/LUCENE-10004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17365411#comment-17365411
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kkewwei commented on LUCENE-10004:
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I do read merge logic, including DocIdMerger. In the new segment, it doesn't
matter if the chunk is flush to file earlier or later.
The order of stored document is important when we read it from old segment,
when reading it from old segment and put into memory, the old order of stored
document is useless. the new
order is determined by the global parameter `docBase`.
> Delete unnecessary flush in
> Lucene90CompressingStoredFieldsWriter.copyChunks() to reduce dirty chunks
> -----------------------------------------------------------------------------------------------------
>
> Key: LUCENE-10004
> URL: https://issues.apache.org/jira/browse/LUCENE-10004
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs
> Affects Versions: 8.8.2
> Reporter: kkewwei
> Priority: Major
>
> In CompressingStoredFieldsWriter.merge(): if the segment meet the following
> conditions:
> {code:java}
> else if (matchingFieldsReader.getCompressionMode() == compressionMode &&
> matchingFieldsReader.getChunkSize() == chunkSize &&
> matchingFieldsReader.getPackedIntsVersion()
> ==PackedInts.VERSION_CURRENT &&
> liveDocs == null &&
> !tooDirty(matchingFieldsReader)) {
> ......
> // flush any pending chunks
> if (numBufferedDocs > 0) {
> flush();
> numDirtyChunks++; // incomplete: we had to force this flush
> }
> ......
> }
> {code}
> We will copy the the all chunk to the new fdt, before copying the chunk, we
> will flush the buffer docs if numBufferedDocs >0, but the flush is
> unnecessary.
> The bufferedDocs in memory have nothing to do with copyChunk. We just need to
> ensure that it will be flush at the end of merge(In finish()).
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