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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/09/30 22:43:00 UTC
[jira] [Work logged] (BEAM-10991) Timers don't release watermark
holds in dataflow on 2.24
[ https://issues.apache.org/jira/browse/BEAM-10991?focusedWorklogId=493198&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-493198 ]
ASF GitHub Bot logged work on BEAM-10991:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 30/Sep/20 22:42
Start Date: 30/Sep/20 22:42
Worklog Time Spent: 10m
Work Description: kennknowles opened a new pull request #12980:
URL: https://github.com/apache/beam/pull/12980
This reverts commit 88acc5267f759d81e9836a9db17b9e0ee521c785.
There is a bug in this commit that causes deleted timers to not clear their
watermark holds, resulting in stuck pipelines. See
https://issues.apache.org/jira/browse/BEAM-10991
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 493198)
Remaining Estimate: 0h
Time Spent: 10m
> 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: 10m
> 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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