[jira] [Created] (IGNITE-2579) Investigate HashMap.Node[] allocations from GridCacheMvccManager$3

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

Vladimir Ozerov created IGNITE-2579:
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             Summary: Investigate HashMap.Node[] allocations from GridCacheMvccManager$3
                 Key: IGNITE-2579
                 URL: https://issues.apache.org/jira/browse/IGNITE-2579
             Project: Ignite
          Issue Type: Task
          Components: cache
    Affects Versions: 1.5.0.final
            Reporter: Vladimir Ozerov
             Fix For: 1.6


*Problem* 
See GridCacheMvccManager.addFuture() method. We create a weird HashSet there with internal table size == 5. Can we have something more efficient here?

*Proposed solution*
Need to run single get-put benchmarks and check usual size of this collection. If it is often equal to 1, then instead of allocating the whole collection, we'd better to have a singleton first and expand to collection if there are more elements. 
Please pay attention that collection usually used as monitor in some synchronized blocks.



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