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From "Alex Parvulescu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-3319) Improve performance of repository updates - tweak index 'deletes' creation
Date Tue, 22 May 2012 12:35:40 GMT
Alex Parvulescu created JCR-3319:
------------------------------------

             Summary: Improve performance of repository updates - tweak index 'deletes' creation
                 Key: JCR-3319
                 URL: https://issues.apache.org/jira/browse/JCR-3319
             Project: Jackrabbit Content Repository
          Issue Type: Improvement
          Components: jackrabbit-core
            Reporter: Alex Parvulescu
            Assignee: Alex Parvulescu


We noticed during some tests that there is a performance hit for heavy update operations when
creating a new index reader.

It appears that for larger index segments (2 million docs) the hit comes from checking each
entry if it is deleted or not, so the workaround would be to try to minimize this intensive
operation by moving the creation and update of this set from the ReadOnlyIndexReader to the
CommittableIndexReader.

The test setup: repository of 7 million nodes, with 4 threads that do only updates on duration
of 5 mins.

The result after applying the patch: the throughput (number of operations per second doubled),
going from ~32 ops/second to ~64 ops/second (with highs up to 74).



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