[jira] [Closed] (FLINK-24464) Metrics sometimes report negative backlog

["Seth Wiesman (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-24464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Seth Wiesman closed FLINK-24464.
--------------------------------
    Fix Version/s: statefun-3.2.0
       Resolution: Fixed

> Metrics sometimes report negative backlog
> -----------------------------------------
>
>                 Key: FLINK-24464
>                 URL: https://issues.apache.org/jira/browse/FLINK-24464
>             Project: Flink
>          Issue Type: Improvement
>          Components: Stateful Functions
>    Affects Versions: statefun-3.1.0
>            Reporter: Seth Wiesman
>            Assignee: Seth Wiesman
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: statefun-3.2.0
>
>
> As reported [here|https://stackoverflow.com/questions/69441309/negative-backlog-in-apache-flink-stateful-functions], the backlog metric sometimes reports a negative value. This is because the current count is stored in an in-memory variable, while the value used to decrement the count as the backlog clears is stored in Flink state. In the case of a job restart, the in-memory variable is reset to zero (it is a new instance) while the numbers in state are retained. 
>  
> A negative backlog is non-sensical, confusing, and should be prevented. 
>  



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