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https://issues.apache.org/jira/browse/FLINK-8237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466065#comment-16466065
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ASF GitHub Bot commented on FLINK-8237:
---------------------------------------
Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/5927
merging
> BucketingSink throws NPE when Writer.duplicate returns null
> -----------------------------------------------------------
>
> Key: FLINK-8237
> URL: https://issues.apache.org/jira/browse/FLINK-8237
> Project: Flink
> Issue Type: Bug
> Reporter: Gábor Hermann
> Priority: Minor
>
> Users need to look into Flink code to find the cause. We could catch that
> null before even running the job.
> {code:java}
> java.lang.NullPointerException
> at
> org.apache.flink.streaming.connectors.fs.bucketing.BucketingSink.openNewPartFile(BucketingSink.java:546)
> at
> org.apache.flink.streaming.connectors.fs.bucketing.BucketingSink.invoke(BucketingSink.java:441)
> at
> org.apache.flink.streaming.api.operators.StreamSink.processElement(StreamSink.java:41)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:528)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:503)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:483)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:891)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:869)
> at
> org.apache.flink.streaming.api.operators.StreamFilter.processElement(StreamFilter.java:40)
> at
> org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:206)
> at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:69)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:263)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
> {code}
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