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https://issues.apache.org/jira/browse/IGNITE-4552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15825618#comment-15825618
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Alexei Scherbakov commented on IGNITE-4552:
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When thread per partition model will be implemented this ticket'll became
obsolete. But this is rather large refactoring, so it may be worth to fix this
meanwhile.
> 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
> 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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