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https://issues.apache.org/jira/browse/IGNITE-5521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068090#comment-16068090
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Mikhail Cherkasov commented on IGNITE-5521:
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changeset:
https://github.com/apache/ignite/commit/f6cbba3f50668bc5dedd5b3e4b3a98ab94956492
> Large near caches lead to cluster instability with metrics enabled
> ------------------------------------------------------------------
>
> Key: IGNITE-5521
> URL: https://issues.apache.org/jira/browse/IGNITE-5521
> Project: Ignite
> Issue Type: Bug
> Components: cache, general
> Affects Versions: 1.7
> Reporter: Alexey Goncharuk
> Assignee: Mikhail Cherkasov
> Priority: Critical
> Labels: important
> Fix For: 2.1
>
>
> We have two issues in the way cache metrics are working:
> 1) Near cache size is calculated using full iteration over the near entries.
> Perhaps, this is done because of near entries may be invalidated by a primary
> node change, however, we should give a less strict metric rather than O(N)
> cache size time
> 2) Cache metrics are copied in discovery worker threads. This looks a bit
> risky because an error like the one described before may stall the whole
> cluster. We need to make sure that when the heartbeat message is processed,
> we already have a metrics snapshot enabled
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