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https://issues.apache.org/jira/browse/IGNITE-3621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15490803#comment-15490803
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Andrey Martianov commented on IGNITE-3621:
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I suggest we should keep separate TtlManager-s for each cache (in order to
manage queues of pending entries of different caches separately) but extract
CleanupWorker and related logic in shared component.
Working this way.
> Make GridCacheTtlManager singleton
> ----------------------------------
>
> Key: IGNITE-3621
> URL: https://issues.apache.org/jira/browse/IGNITE-3621
> Project: Ignite
> Issue Type: Bug
> Components: cache
> Affects Versions: 1.6
> Reporter: Eduard Shangareev
> Assignee: Andrey Martianov
> Labels: performance
>
> Now every cache has own TTL manager, which creates CleanupWorker = new extra
> thread. This can cause to extra hundreds of threads (redundant context
> switches = performance penalty).
> Also, under IGNITE-3513 every put can enter critical section to notify
> worker. Obviously, it is not good from performance point of view.
> So, my proposal is next:
> 1. Expiration should be done on every cache action (on exit thread which
> updates cache should invoke {{expire}}).
> 2. TtlManager will exist only in one instance.
> 3. CleanupWorker will be the only backup if there is no cache activity. It
> will wake up with some period to check for work (500 ms, for example).
> Moreover, now we keep on-heap pending entries even if a cache is kept
> off-head. At least, this issue needs discussion.
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