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https://issues.apache.org/jira/browse/BEAM-10760?focusedWorklogId=478414&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-478414
]
ASF GitHub Bot logged work on BEAM-10760:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 03/Sep/20 09:36
Start Date: 03/Sep/20 09:36
Worklog Time Spent: 10m
Work Description: mxm commented on a change in pull request #12759:
URL: https://github.com/apache/beam/pull/12759#discussion_r482841893
##########
File path:
runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/state/FlinkStateInternals.java
##########
@@ -75,7 +80,14 @@
public class FlinkStateInternals<K> implements StateInternals {
private final KeyedStateBackend<ByteBuffer> flinkStateBackend;
- private Coder<K> keyCoder;
+ private final Coder<K> keyCoder;
+
+ /**
+ * A set which contains all state descriptors created in the global window.
Used for cleanup on
Review comment:
Yes, that's right but that doesn't matter because all other state should
also be cleaned up with the global window.
##########
File path:
runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/state/FlinkStateInternals.java
##########
@@ -75,7 +80,14 @@
public class FlinkStateInternals<K> implements StateInternals {
private final KeyedStateBackend<ByteBuffer> flinkStateBackend;
- private Coder<K> keyCoder;
+ private final Coder<K> keyCoder;
+
+ /**
+ * A set which contains all state descriptors created in the global window.
Used for cleanup on
Review comment:
I'll remove "global window".
##########
File path:
runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/state/FlinkStateInternals.java
##########
@@ -139,17 +163,27 @@ private FlinkStateBinder(StateNamespace namespace,
StateContext<?> stateContext)
@Override
public <T2> ValueState<T2> bindValue(
String id, StateSpec<ValueState<T2>> spec, Coder<T2> coder) {
- return new FlinkValueState<>(flinkStateBackend, id, namespace, coder);
+ ValueStateDescriptor<T2> valueStateDescriptor =
+ new ValueStateDescriptor<>(id, new CoderTypeSerializer<>(coder));
+ globalWindowStateDescriptors.add(valueStateDescriptor);
+ return new FlinkValueState<>(flinkStateBackend, id, namespace,
valueStateDescriptor);
}
@Override
public <T2> BagState<T2> bindBag(String id, StateSpec<BagState<T2>> spec,
Coder<T2> elemCoder) {
- return new FlinkBagState<>(flinkStateBackend, id, namespace, elemCoder);
+ ListStateDescriptor<T2> listStateDescriptor =
+ new ListStateDescriptor<>(id, new CoderTypeSerializer<>(elemCoder));
+ globalWindowStateDescriptors.add(listStateDescriptor);
Review comment:
This is unrelated to the changes here. This object was just created a
layer down before (FlinkBagState). Let's handle such optimizations in a
follow-up.
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Issue Time Tracking
-------------------
Worklog Id: (was: 478414)
Time Spent: 3h 40m (was: 3.5h)
> 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: 3h 40m
> 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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