[jira] [Assigned] (IGNITE-2274) Avoid ArrayList creation for a single element when possible.

["Ilya Lantukh (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-2274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ilya Lantukh reassigned IGNITE-2274:
------------------------------------

    Assignee:     (was: Ilya Lantukh)

> Avoid ArrayList creation for a single element when possible.
> ------------------------------------------------------------
>
>                 Key: IGNITE-2274
>                 URL: https://issues.apache.org/jira/browse/IGNITE-2274
>             Project: Ignite
>          Issue Type: Sub-task
>          Components: general
>    Affects Versions: ignite-1.4
>            Reporter: Vladimir Ozerov
>             Fix For: 1.6
>
>
> Profiling shown lots of ArrayList allocations. Investigation shown the following usual pattern in our code:
> 1) Create empty ArrayList.
> 2) Then add a single element to it at some point. When this addition happens, ArrayList allocates Object[10] array. 
> But in lots cases we know in advance that particular senario will contain only single entry in this collection.
> Need to fix places where it is trivial to detect and handle.



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