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Posted to issues@flink.apache.org by "Konstantin Knauf (JIRA)" <ji...@apache.org> on 2018/09/27 11:19:00 UTC

[jira] [Created] (FLINK-10452) Expose Additional Metrics to Reason about Statesize

Konstantin Knauf created FLINK-10452:
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             Summary: Expose Additional Metrics to Reason about Statesize
                 Key: FLINK-10452
                 URL: https://issues.apache.org/jira/browse/FLINK-10452
             Project: Flink
          Issue Type: Improvement
          Components: Metrics
            Reporter: Konstantin Knauf


For monitoring purposes it would be helpful, if Flink could expose metrics about the number of keys/windows for each registered keyed state. 

Open Questions:
* One Metric per Registered State? One Metric per KeyedOperator?
* Performance Impact (should this be default behavior?)
* Possible to know the number of windows during runtime?
* RocksDB only gives you an estimate of the number keys. Would be nice if we could derive the exact number inside Flink. This would also help in sizing the RocksDB instances and estimated their memory footprint.



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