[
https://issues.apache.org/jira/browse/BEAM-10991?focusedWorklogId=493779&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-493779
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ASF GitHub Bot logged work on BEAM-10991:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 02/Oct/20 02:27
Start Date: 02/Oct/20 02:27
Worklog Time Spent: 10m
Work Description: kennknowles opened a new pull request #12997:
URL: https://github.com/apache/beam/pull/12997
In reverting the fix for BEAM-8543 I also reverted the edit to CHANGES.md.
Instead, CHANGES.md should have forward information about the known issues.
This PR adds it. I have also added this to my cherry pick to the 2.25.0 branch.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 493779)
Time Spent: 2h 40m (was: 2.5h)
> Timers don't release watermark holds in dataflow on 2.24
> --------------------------------------------------------
>
> Key: BEAM-10991
> URL: https://issues.apache.org/jira/browse/BEAM-10991
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Affects Versions: 2.24.0
> Reporter: Steve Niemitz
> Assignee: Kenneth Knowles
> Priority: P1
> Fix For: 2.25.0
>
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> We have multiple streaming pipelines (using state + timers) that, after
> upgrading to 2.24, exhibited very strange watermark behavior. The watermark
> on some stateful DoFns would advance to the end of the first window, and then
> get stuck there forever, even preventing the job from draining.
> I was able to track the problem down to
> [https://github.com/apache/beam/commit/88acc5267f759d81e9836a9db17b9e0ee521c785.|https://github.com/apache/beam/commit/88acc5267f759d81e9836a9db17b9e0ee521c785]
> After revering it, the behavior went back to normal. It looks like its
> possible in that commit that watermark holds for some timers aren't being
> cleared.
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