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https://issues.apache.org/jira/browse/BEAM-11034?focusedWorklogId=499499&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-499499
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ASF GitHub Bot logged work on BEAM-11034:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 12/Oct/20 16:19
Start Date: 12/Oct/20 16:19
Worklog Time Spent: 10m
Work Description: reuvenlax commented on pull request #13032:
URL: https://github.com/apache/beam/pull/13032#issuecomment-707216813
What onDrain method are you referring to?
On Mon, Oct 12, 2020 at 9:16 AM Kenn Knowles <[email protected]>
wrote:
> *@kennknowles* commented on this pull request.
> ------------------------------
>
> In
>
runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/SimpleParDoFn.java
> <https://github.com/apache/beam/pull/13032#discussion_r503400133>:
>
> > Instant cleanupTime = earliestAllowableCleanupTime(window,
windowingStrategy);
> - // if DoFn has OnWindowExpiration then set holds for system timer.
> - Instant cleanupOutputTimestamp =
> - fnSignature.onWindowExpiration() == null ? cleanupTime :
cleanupTime.minus(1L);
> - stepContext.setStateCleanupTimer(
> - CLEANUP_TIMER_ID, window, windowCoder, cleanupTime,
cleanupOutputTimestamp);
> + // Set a cleanup timer for state at the end of the window to
trigger onWindowExpiration and
> + // garbage collect state. We avoid doing this for the global window
if there is no window
> + // expiration set as the state will be up when the pipeline
terminates. Setting the timer
> + // leads to a unbounded growth of timers for pipelines with many
unique keys in the global
> + // window.
> + if (cleanupTime.isBefore(GlobalWindow.INSTANCE.maxTimestamp())
>
> Re-reading the bug and thinking about your comments, can we eliminate this
> condition and invoke from some onDrain method?
>
> —
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Issue Time Tracking
-------------------
Worklog Id: (was: 499499)
Time Spent: 1h 50m (was: 1h 40m)
> State garbage collection timers set by Dataflow SimpleParDoFn pile up for the
> GlobalWindow
> ------------------------------------------------------------------------------------------
>
> Key: BEAM-11034
> URL: https://issues.apache.org/jira/browse/BEAM-11034
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Reporter: Sam Whittle
> Assignee: Sam Whittle
> Priority: P2
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> If the dofn is stateful, garbage collection timers are set for the end of the
> window plus allowed lateness:
> https://github.com/apache/beam/blob/6fdde4f4eab72b49b10a8bb1cb3be263c5c416b5/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/SimpleParDoFn.java#L491
> For the global window this ends up setting garbage collection timers that
> will only fire once the pipeline is drained. For pipelines that have
> constantly newly arriving unique stateful keys, and otherwise cleanup their
> state appropriately when triggering occurs, the # of timers builds up over
> time.
> Example window and trigger, where the user has the opportunity to clean up
> state for the key after at most a minute. However they have no control over
> the timer set.
> GlobalWindows()
> .triggering(Repeatedly.forever(AfterFirst.of(
> AfterPane.elementCountAtLeast(5000),
> AfterProcessingTime.pastFirstElementInPane().plusDelayOf(Duration.standardMi
> nutes(1))).discardingFiredPanes().withAllowedLateness(Duration.ZERO);
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