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https://issues.apache.org/jira/browse/BEAM-7684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17137229#comment-17137229
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Beam JIRA Bot commented on BEAM-7684:
-------------------------------------
This issue was marked "stale-P2" and has not received a public comment in 14
days. It is now automatically moved to P3. If you are still affected by it, you
can comment and move it back to P2.
> WindmillStateCache grossly misunderestimates object size in its weighting
> function
> ----------------------------------------------------------------------------------
>
> Key: BEAM-7684
> URL: https://issues.apache.org/jira/browse/BEAM-7684
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Reporter: Steve Niemitz
> Priority: P3
>
> As a little experiment, we set the WindmillStateCache size to 2 GB. After we
> let a job run for a few hours, the workers all died from OOMs. Digging into
> the memory usage, over 10 GB of heap was used by the WindmillStateCache. The
> total weight the cache had calculated however was only ~800 MB.
> It looks like the StateCacheEntry calculation is way off. The weight of an
> entry was calculated as only ~200, while the actual heap usage of it (as
> reported by YourKit at least) was around 2,400 bytes.
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