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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/10/27 21:29:00 UTC
[jira] [Work logged] (BEAM-11143) AfterWatermark can leak state for
the late trigger when merging windows
[ https://issues.apache.org/jira/browse/BEAM-11143?focusedWorklogId=505417&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-505417 ]
ASF GitHub Bot logged work on BEAM-11143:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 27/Oct/20 21:28
Start Date: 27/Oct/20 21:28
Worklog Time Spent: 10m
Work Description: scwhittle opened a new pull request #13206:
URL: https://github.com/apache/beam/pull/13206
…er state
for merged away windows.
Previously the trigger state was cleared with the mergecontext directly which cleared it for the merged-to window namespace, while leaving state in the merged-from window namespaces. Since the merged away windows were then removed from the window set and forgotten, this state could be never cleaned up.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 505417)
Remaining Estimate: 0h
Time Spent: 10m
> AfterWatermark can leak state for the late trigger when merging windows
> -----------------------------------------------------------------------
>
> Key: BEAM-11143
> URL: https://issues.apache.org/jira/browse/BEAM-11143
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Sam Whittle
> Assignee: Sam Whittle
> Priority: P2
> Time Spent: 10m
> Remaining Estimate: 0h
>
> AfterWatermarkStateMachine attempts to clear the late trigger state when merging and the early trigger is not closed in some windows. However it appears to clear the state corresponding to the new window, not all of the states for the input windows. This leaks the state which can lead to unbounded pipeline state buildup.
> https://github.com/apache/beam/blob/68d6c8e6243b1d8f392840273f886276e2a8baff/runners/core-java/src/main/java/org/apache/beam/runners/core/triggers/AfterWatermarkStateMachine.java#L133
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