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https://issues.apache.org/jira/browse/FLINK-5229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15837735#comment-15837735
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Robert Metzger commented on FLINK-5229:
---------------------------------------
I'm seeing the following exceptions in my 1.2.0 RC1 code
{code}
2017-01-25 12:47:48,775 WARN
org.apache.flink.streaming.runtime.tasks.StreamTask - Could not
properly clean up the async checkpoint runnable.
java.lang.Exception: Could not properly cancel managed operator state future.
at
org.apache.flink.streaming.api.operators.OperatorSnapshotResult.cancel(OperatorSnapshotResult.java:99)
at
org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.cleanup(StreamTask.java:992)
at
org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.close(StreamTask.java:979)
at org.apache.flink.util.IOUtils.closeQuietly(IOUtils.java:224)
at
org.apache.flink.util.AbstractCloseableRegistry.close(AbstractCloseableRegistry.java:92)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.cancel(StreamTask.java:363)
at
org.apache.flink.runtime.taskmanager.Task$TaskCanceler.run(Task.java:1384)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at
org.apache.flink.runtime.state.StateUtil.discardStateFuture(StateUtil.java:81)
at
org.apache.flink.streaming.api.operators.OperatorSnapshotResult.cancel(OperatorSnapshotResult.java:97)
... 7 more
{code}
I'm asking here because its code that has been touched while addressing this
JIRA.
How critical is this?
> Cleanup StreamTaskStates if a checkpoint operation of a subsequent operator
> fails
> ----------------------------------------------------------------------------------
>
> Key: FLINK-5229
> URL: https://issues.apache.org/jira/browse/FLINK-5229
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing, TaskManager
> Affects Versions: 1.2.0, 1.1.3
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
> Fix For: 1.2.0, 1.1.4, 1.3.0
>
>
> Due to chaining, a {{StreamTask}} needs to checkpoint multiple operators. If
> the first operators succeed in creating a checkpoint but a subsequent
> operator in the chain fails, the {{StreamTask}} has to clean up the already
> completed checkpoints. Otherwise we might end up with orphaned state data.
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