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https://issues.apache.org/jira/browse/IGNITE-2502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15123569#comment-15123569
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Dmitriy Setrakyan commented on IGNITE-2502:
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How about creating ArrayLists of the accurate size and *only* if we need them.
Is it possible?
> 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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