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

["Dmitriy Setrakyan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-2502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15123569#comment-15123569 ] 

Dmitriy Setrakyan commented on IGNITE-2502:
-------------------------------------------

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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