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https://issues.apache.org/jira/browse/FLINK-6294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15972741#comment-15972741
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Aljoscha Krettek commented on FLINK-6294:
-----------------------------------------
I created a test job that uses {{BucketingSink}} and followed your steps to try
and reproduce the problem. I didn't manage to do so. What's your exact Flink
version? On my dashboard it says Flink 1.2.0, commit 1c659cf.
> BucketingSink throws NPE while cancelling job
> ---------------------------------------------
>
> Key: FLINK-6294
> URL: https://issues.apache.org/jira/browse/FLINK-6294
> Project: Flink
> Issue Type: Bug
> Components: Streaming Connectors
> Affects Versions: 1.2.0
> Reporter: Andrey
>
> Steps to reproduce:
> * configure BucketingSink and run job
> * cancel job from UI before processing any messages
> * in logs:
> {code}
> 2017-04-11 10:14:54,681 INFO org.apache.flink.core.fs.FileSystem
> - Ensuring all FileSystem streams are closed for Source: Custom
> Source (1/2) [Source: Custom Source (1/2)]
> 2017-04-11 10:14:54,881 INFO
> org.apache.flink.runtime.taskmanager.TaskManager -
> Un-registering task and sending final execution state CANCELED to JobManager
> for task Source: Custom Source (56d0c9ffe06dc3e4481e7ce530d9894f)
> [flink-akka.actor.default-dispatcher-4]
> 2017-04-11 10:14:56,584 ERROR
> org.apache.flink.streaming.runtime.tasks.StreamTask - Error during
> disposal of stream operator. [Flat Map -> Sink: Unnamed (2/2)]
> java.lang.NullPointerException
> at
> org.apache.flink.streaming.connectors.fs.bucketing.BucketingSink.close(BucketingSink.java:422)
> at
> org.apache.flink.api.common.functions.util.FunctionUtils.closeFunction(FunctionUtils.java:43)
> at
> org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.dispose(AbstractUdfStreamOperator.java:127)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.disposeAllOperators(StreamTask.java:442)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:343)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:655)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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