[jira] [Created] (IGNITE-2502) GridNearAtomicUpdateRequest allocates to much Object[]

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

Vladimir Ozerov created IGNITE-2502:
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             Summary: GridNearAtomicUpdateRequest allocates to much Object[]
                 Key: IGNITE-2502
                 URL: https://issues.apache.org/jira/browse/IGNITE-2502
             Project: Ignite
          Issue Type: Sub-task
          Components: cache
    Affects Versions: 1.5.0.final
            Reporter: Vladimir Ozerov
            Assignee: Vladimir Ozerov
             Fix For: 1.6


*Problem*
GridNearAtomicUpdateRequest might create up to 4 ArrayList's. Initially they are empty. When the very first element is added, ArrayList is extended to hold 10 objects (new Object[]). Put in ATOMIC cache almost all operations are performed on a single key. 
As a result 90% of array is not used.

*Proposed solution*
We know in advance how many keys participate in operation. Let's use min(10, keyCount) as initial array list size. This will make allocation more accurate.



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