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From "Stanilovsky Evgeny (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (IGNITE-4552) Optimize GridDhtLocalPartition.rmvQueue
Date Mon, 23 Jan 2017 09:18:26 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-4552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stanilovsky Evgeny reassigned IGNITE-4552:
------------------------------------------

    Assignee: Stanilovsky Evgeny

> Optimize GridDhtLocalPartition.rmvQueue
> ---------------------------------------
>
>                 Key: IGNITE-4552
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4552
>             Project: Ignite
>          Issue Type: Bug
>          Components: cache
>    Affects Versions: 1.6
>            Reporter: Alexei Scherbakov
>            Assignee: Stanilovsky Evgeny
>             Fix For: 2.0
>
>
> Current implementation stores deferred entry removals in rmvQueue for consistency guaranties.
> This can lead to significant heap over-usage(I observed several Gbs) in case of many
caches with removals, because currently queue is cleared lazily after reaching max capacity(200_000
by default).
> This can be mitigated by using lower IGNITE_ATOMIC_CACHE_DELETE_HISTORY_SIZE, but can
lead to consistency issues in case of frequent cache updates.
> Possible optimizations:
> * Use single fixed size queue per all caches to overcome limitations of IGNITE_ATOMIC_CACHE_DELETE_HISTORY_SIZE
workaround.
> * Do queue cleaning in background
> * Move queue to an off-heap.



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