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https://issues.apache.org/jira/browse/BEAM-10760?focusedWorklogId=477813&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-477813
]
ASF GitHub Bot logged work on BEAM-10760:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 02/Sep/20 11:46
Start Date: 02/Sep/20 11:46
Worklog Time Spent: 10m
Work Description: mxm commented on a change in pull request #12733:
URL: https://github.com/apache/beam/pull/12733#discussion_r481938984
##########
File path:
runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/ExecutableStageDoFnOperator.java
##########
@@ -592,12 +593,35 @@ public long applyOutputWatermarkHold(long
currentOutputWatermark, long potential
return currentOutputWatermark;
}
} else {
+ // Check if the final watermark was triggered to perform state cleanup
for global window
+ if (potentialOutputWatermark >
BoundedWindow.TIMESTAMP_MAX_VALUE.getMillis()
+ && currentOutputWatermark <=
BoundedWindow.TIMESTAMP_MAX_VALUE.getMillis()) {
+ cleanupGlobalWindowState();
+ }
Review comment:
This logic should be moved to `DoFnOperator#emitWatermark`. It can then
also be simplified.
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Issue Time Tracking
-------------------
Worklog Id: (was: 477813)
Time Spent: 1.5h (was: 1h 20m)
> Cleanup timers lead to unbounded state accumulation in global window
> --------------------------------------------------------------------
>
> Key: BEAM-10760
> URL: https://issues.apache.org/jira/browse/BEAM-10760
> Project: Beam
> Issue Type: Bug
> Components: runner-core, runner-flink
> Affects Versions: 2.21.0
> Reporter: Thomas Weise
> Assignee: Thomas Weise
> Priority: P2
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> For each key, the runner sets a cleanup timer that is designed to garbage
> collect state at the end of a window. For a global window, these timers will
> stay around until the pipeline terminates. Depending on the key cardinality,
> this can lead to unbounded state growth, which in the case of the Flink
> runner is observable in the growth of checkpoint size.
> https://lists.apache.org/thread.html/rae268806035688b77646195505e5b7a56568a38feb1e52d6341feedd%40%3Cdev.beam.apache.org%3E
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