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From "Jason Rutherglen (JIRA)" <>
Subject [jira] Created: (LUCENE-1322) Remove synchronization in CompoundFileReader
Date Mon, 30 Jun 2008 13:11:45 GMT
Remove synchronization in CompoundFileReader

                 Key: LUCENE-1322
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Index
    Affects Versions: 2.3.1
            Reporter: Jason Rutherglen
            Priority: Trivial

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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