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https://issues.apache.org/jira/browse/BEAM-9979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17111371#comment-17111371
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Luke Cwik commented on BEAM-9979:
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Nobody is working on it, moved to 2.23.
> Fix race condition where the read index maybe reported from the last executed
> bundle
> ------------------------------------------------------------------------------------
>
> Key: BEAM-9979
> URL: https://issues.apache.org/jira/browse/BEAM-9979
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-harness
> Reporter: Luke Cwik
> Priority: P3
> Fix For: 2.22.0
>
>
> When the BeamFnDataReadRunner is reused there is a short period of time when
> a progress request could happen before the the start function is called
> resetting the read index to -1.
> I believe there should be a way to *reset* an operator before it gets added
> to the set of cached bundle processors separate instead of placing clean-up
> in any *start* functions that those operators may rely on preventing exposing
> details of those operators before *start* may have been invoked.
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