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

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

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

Vladimir Ozerov updated IGNITE-2274:
------------------------------------
    Priority: Minor  (was: Major)

> 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: Task
>          Components: general
>    Affects Versions: ignite-1.4
>            Reporter: Vladimir Ozerov
>            Priority: Minor
>              Labels: performance
>             Fix For: 2.0
>
>
> 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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