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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