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Posted to dev@lucene.apache.org by "Michael McCandless (JIRA)" <ji...@apache.org> on 2008/07/02 10:24:45 UTC
[jira] Assigned: (LUCENE-1322) Remove synchronization in
CompoundFileReader
[ https://issues.apache.org/jira/browse/LUCENE-1322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael McCandless reassigned LUCENE-1322:
------------------------------------------
Assignee: Michael McCandless
> 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
> Assignee: Michael McCandless
> 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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