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https://issues.apache.org/jira/browse/FLINK-10969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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vinoyang reassigned FLINK-10969:
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Assignee: vinoyang
> expose API or metric for total number of keys stored in state backend
> ---------------------------------------------------------------------
>
> Key: FLINK-10969
> URL: https://issues.apache.org/jira/browse/FLINK-10969
> Project: Flink
> Issue Type: New Feature
> Components: State Backends, Checkpointing
> Reporter: Steven Zhen Wu
> Assignee: vinoyang
> Priority: Major
>
> [~srichter] mentioned it might make sense to provide two versions: exact
> count and approximate count. For some state backend (likes rocksDB), it may
> be much cheaper to get approximate count.
> exposing as metrics would be ideal.
> Additionally, it will also be useful to get the total count of timers, which
> are also stored in state backend. Stefan mentioned timers are just a
> different namespace in state backend (e.g. column family in rocksDB). So it
> will be very useful if the metrics have _namespace_ tag.
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