Remove synchronization in CompoundFileReader
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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
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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