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From "Aaron McCurry (JIRA)" <j...@apache.org>
Subject [jira] [Created] (BLUR-249) Sync performance issue in the IndexInputCloser class
Date Mon, 30 Sep 2013 21:10:23 GMT
Aaron McCurry created BLUR-249:
----------------------------------

             Summary: Sync performance issue in the IndexInputCloser class
                 Key: BLUR-249
                 URL: https://issues.apache.org/jira/browse/BLUR-249
             Project: Apache Blur
          Issue Type: Improvement
          Components: Blur
    Affects Versions: 0.3.0, 0.2.1
            Reporter: Aaron McCurry
             Fix For: 0.3.0, 0.2.1


While running some load tests on a medium sized cluster I noticed a lot of blocked state on
the index-manager threads.  These threads are used during  the parallel search.  Upon inspection
of a thread dump I noticed that all the blocked state threads were blocking on line 67 in
the IndexInputCloser class.  This is to synchronize on a collection addition because the implementation
is a HashSet.

This task is to change the refs field to be a concurrenthashmap using the Collections.newSetFromMap()
method.



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