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https://issues.apache.org/jira/browse/LUCENE-10125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17420782#comment-17420782
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Uwe Schindler commented on LUCENE-10125:
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[~jpountz]: Yes, this can be done in buffered output stream. It should NOT be
in FSIndexOutput.
[~rcmuir]: Thats exactly my plan (see the discussion in the PR)
I can work on a patch and use the new VarHandles to write the longs/ints/shorts
directly into the buffer of the output stream. You need to add a bit of
wrapping.
As Robert said in the issue: this was exactly why I made the suggestion to
check if it is really an issue with performance. I already optimized
ByteArrayDataOutput in the same way. Here the generic OutputStreamIndexOutput
and its internal BufferedOutputStream instance needs the optimization, NOT
FSDirectoryOutput!
> Investigate indexing throughput regression on NYC Taxis between 2021-04-12
> and 2021-05-24
> -----------------------------------------------------------------------------------------
>
> Key: LUCENE-10125
> URL: https://issues.apache.org/jira/browse/LUCENE-10125
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
>
> There's been a significant drop in indexing throughput between 2021-04-12 and
> 2021-05-24 on the NYC Taxis benchmark. Unfortunately several suspects have
> been merged during that period of time so we might need to git bisect to
> figure out which one is responsible for the regression. Interestingly the
> sorted index looks less affected than the non-sorted indexes.
> https://home.apache.org/~mikemccand/lucenebench/sparseResults.html#index_throughput
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