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

["Alexey Goncharuk (JIRA)" <ji...@apache.org>]

Alexey Goncharuk created IGNITE-5521:
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             Summary: 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
             Fix For: 2.2


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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