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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