[jira] [Updated] (IGNITE-2583) Investigate CHM8 allocations in GridDhtTxLocalAdapter.

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

     [ https://issues.apache.org/jira/browse/IGNITE-2583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov updated IGNITE-2583:
------------------------------------
    Issue Type: Task  (was: Sub-task)
        Parent:     (was: IGNITE-2232)

> Investigate CHM8 allocations in GridDhtTxLocalAdapter.
> ------------------------------------------------------
>
>                 Key: IGNITE-2583
>                 URL: https://issues.apache.org/jira/browse/IGNITE-2583
>             Project: Ignite
>          Issue Type: Task
>          Components: cache
>    Affects Versions: 1.5.0.final
>            Reporter: Vladimir Ozerov
>            Assignee: Ilya Lantukh
>              Labels: performance
>             Fix For: 1.6
>
>
> *Problem*
> Whenever GridDhtTxLocalAdapter is allocated, two CHM8-s are created immediately: "nearMap" and "dhtMap". 
> This is visible as a memory hotspot, which is responsible for >2% of overall allocations during single PUT.
> *Proposed solution*
> 1) Investigate whether we really need concurrent semantics here. Can these maps be replaced with HashMap-s or (HashMap + synchronzied)?
> 2) Investigate whether we can optimize for single-mapping scenario.



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