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Posted to issues@flink.apache.org by "vinoyang (JIRA)" <ji...@apache.org> on 2018/11/22 01:37:00 UTC

[jira] [Assigned] (FLINK-10969) expose API or metric for total number of keys stored in state backend

     [ https://issues.apache.org/jira/browse/FLINK-10969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

vinoyang reassigned FLINK-10969:
--------------------------------

    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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