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https://issues.apache.org/jira/browse/LUCENE-1322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Rutherglen updated LUCENE-1322:
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Attachment: lucene-1322.patch
lucene-1322.patch
CSIndexInput.clone() added that clones the base IndexInput removing the
synchronization overhead from CompoundFileReader.
> Remove synchronization in CompoundFileReader
> --------------------------------------------
>
> Key: LUCENE-1322
> URL: https://issues.apache.org/jira/browse/LUCENE-1322
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.3.1
> Reporter: Jason Rutherglen
> Priority: Trivial
> Attachments: lucene-1322.patch
>
>
> Currently there is what seems to be unnecessary synchronization in
> CompoundFileReader. This is solved by cloning the base IndexInput.
> Synchronization in low level IO classes creates lock contention on highly
> multi threaded Lucene installations, so much so that in many cases the CPU
> utilization never reaches the maximum without using something like
> ParallelMultiSearcher.
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