[jira] [Assigned] (IGNITE-5521) Large near caches lead to cluster instability with metrics enabled

["Mikhail Cherkasov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-5521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mikhail Cherkasov reassigned IGNITE-5521:
-----------------------------------------

    Assignee: Mikhail Cherkasov

> 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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