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https://issues.apache.org/jira/browse/BEAM-12229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17332832#comment-17332832
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Steve Niemitz commented on BEAM-12229:
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Can confirm that [https://github.com/apache/beam/pull/13862] was the culprit
here. Reverting it brought me back to ~100% hit rate.
> WindmillStateCache has a 0% hit rate in 2.29
> --------------------------------------------
>
> Key: BEAM-12229
> URL: https://issues.apache.org/jira/browse/BEAM-12229
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Affects Versions: 2.29.0
> Reporter: Steve Niemitz
> Assignee: Reuven Lax
> Priority: P1
>
> After upgrading to 2.29, I noticed that our jobs have a 0% state cache hit
> rate. I see a very high eviction rate from the cache as well (it used to be
> ~0, now its ~100,000+ evictions / second).
> We never were on 2.28, so I can't say if it worked there, but it did work on
> 2.27.
>
>
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