[jira] [Created] (IGNITE-2580) Investigate HashMap.Node[] allocations from GridDhtTxPrepareFuture.readyLocks(Iterable)

[Anton Vinogradov (Jira)]

Vladimir Ozerov created IGNITE-2580:
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             Summary: Investigate HashMap.Node[] allocations from GridDhtTxPrepareFuture.readyLocks(Iterable)
                 Key: IGNITE-2580
                 URL: https://issues.apache.org/jira/browse/IGNITE-2580
             Project: Ignite
          Issue Type: Sub-task
          Components: cache
    Affects Versions: 1.5.0.final
            Reporter: Vladimir Ozerov
             Fix For: 1.6


*Problem*
GridDhtTxPrepareFuture is initialized with empty HashSet by default. When single lock is ready HashSet.add() is called causing immediate expansion of underlying HashMap table.

*Solution*
Do we really need fully-fledged hash set immediately? Probably we can optimize for single-lock case so that HashSet is not needed at all.



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