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https://issues.apache.org/jira/browse/BEAM-10760?focusedWorklogId=480164&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-480164
]
ASF GitHub Bot logged work on BEAM-10760:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 08/Sep/20 14:16
Start Date: 08/Sep/20 14:16
Worklog Time Spent: 10m
Work Description: mxm commented on a change in pull request #12759:
URL: https://github.com/apache/beam/pull/12759#discussion_r484955004
##########
File path:
runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/state/FlinkStateInternals.java
##########
@@ -114,16 +129,26 @@ public K getKey() {
return address.getSpec().bind(address.getId(), new
FlinkStateBinder(namespace, context));
}
- public void clearBagStates(StateNamespace namespace, StateTag<? extends
BagState> address)
- throws Exception {
- CoderTypeSerializer typeSerializer = new
CoderTypeSerializer<>(VoidCoder.of());
- flinkStateBackend.applyToAllKeys(
- namespace.stringKey(),
- StringSerializer.INSTANCE,
- new ListStateDescriptor<>(address.getId(), typeSerializer),
- (key, state) -> {
- state.clear();
- });
+ /**
+ * Allows to clear all state for the global watermark when the maximum
watermark arrives. We do
+ * not clean up the global window state via timers which would lead to an
unbounded number of keys
+ * and cleanup timers. Instead, the cleanup code below should be run when we
finally receive the
+ * max watermark.
+ */
+ public void clearGlobalState() {
Review comment:
I think it has to be because this is called from outside of the `state`
package.
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Issue Time Tracking
-------------------
Worklog Id: (was: 480164)
Time Spent: 6h (was: 5h 50m)
> 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: 6h
> 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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