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https://issues.apache.org/jira/browse/FLINK-5551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15837769#comment-15837769
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Aljoscha Krettek commented on FLINK-5551:
-----------------------------------------
I think this can happen when canceling happens before the Task/Operator is
properly set up? The exception is a follow-up exceptions that happens because
of the canceling. Do we need to address this, [~StephanEwen]?
> NPE at SourceStreamTask
> -----------------------
>
> Key: FLINK-5551
> URL: https://issues.apache.org/jira/browse/FLINK-5551
> Project: Flink
> Issue Type: Bug
> Components: DataStream API
> Affects Versions: 1.2.0
> Reporter: Andrey
>
> Prerequisites:
> * Configure hdfs-based backend for the job
> * cancel it using webapp admin
> In logs during job cancel:
> {code}
> 2017-01-17 16:22:08,756 INFO
> org.apache.flink.streaming.runtime.tasks.StreamTask - Using
> user-defined state backend: File State Backend @
> hdfs://host:port/flink-checkpoints
> 2017-01-17 16:22:08,756 INFO org.apache.flink.runtime.taskmanager.Task
> - Attempting to cancel task Source: Custom Source -> Filter
> (3/8)
> 2017-01-17 16:22:08,756 INFO org.apache.flink.runtime.taskmanager.Task
> - Source: Custom Source -> Filter (3/8) switched to CANCELING
> 2017-01-17 16:22:08,756 INFO org.apache.flink.runtime.taskmanager.Task
> - Triggering cancellation of task code Source: Custom Source ->
> Filter (3/8) (559a224c8ef78884db727dab0b2d5e99).
> 2017-01-17 16:22:08,756 ERROR org.apache.flink.runtime.taskmanager.Task
> - Error while canceling the task
> java.lang.NullPointerException
> at
> org.apache.flink.streaming.runtime.tasks.SourceStreamTask.cancelTask(SourceStreamTask.java:61)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.cancel(StreamTask.java:349)
> at
> org.apache.flink.runtime.taskmanager.Task$TaskCanceler.run(Task.java:1214)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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