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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/05/21 00:26:00 UTC
[jira] [Work logged] (BEAM-10051) Misordered check WRT closed data
readers.
[ https://issues.apache.org/jira/browse/BEAM-10051?focusedWorklogId=435786&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-435786 ]
ASF GitHub Bot logged work on BEAM-10051:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 21/May/20 00:25
Start Date: 21/May/20 00:25
Worklog Time Spent: 10m
Work Description: lostluck opened a new pull request #11768:
URL: https://github.com/apache/beam/pull/11768
The closed reader check, in it's current position prevents the "normal teardown" that the reader expects. This means that readers for instructions that terminate early such as due to splitting stay resident in memory and never close.
In practice this is benign as the buffer would already be closed, but with streaming this memory leak would become noticable.
This PR moves the check to after the sentinel check, and additionally check there for early termination to avoid closing the buffer twice.
Since this largely affects the goroutine local cache, no test changes are possible.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 435786)
Remaining Estimate: 0h
Time Spent: 10m
> Misordered check WRT closed data readers.
> -----------------------------------------
>
> Key: BEAM-10051
> URL: https://issues.apache.org/jira/browse/BEAM-10051
> Project: Beam
> Issue Type: Bug
> Components: sdk-go
> Reporter: Robert Burke
> Priority: P2
> Time Spent: 10m
> Remaining Estimate: 0h
>
> This check https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/harness/datamgr.go#L269
> in it's current position prevents the "normal teardown" that the reader expects. This means that readers for instructions that terminate early such as due to splitting stay resident in memory and never close.
> In practice this is benign as the buffer would already be closed, but with streaming this memory leak would become noticable.
> The fix is to move the check to after the sentinel check, and additionally check there for early termination to avoid closing the buffer twice.
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