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https://issues.apache.org/jira/browse/SPARK-6414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14374808#comment-14374808
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Apache Spark commented on SPARK-6414:
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User 'hunglin' has created a pull request for this issue:
https://github.com/apache/spark/pull/5124
> Spark driver failed with NPE on job cancelation
> -----------------------------------------------
>
> Key: SPARK-6414
> URL: https://issues.apache.org/jira/browse/SPARK-6414
> Project: Spark
> Issue Type: Bug
> Components: Scheduler
> Affects Versions: 1.2.1, 1.3.0
> Reporter: Yuri Makhno
> Priority: Critical
>
> When a job group is cancelled, we scan through all jobs to determine which
> are members of the group. This scan assumes that the job group property is
> always set. If 'properties' is null in an active job, you get an NPE.
> We just need to make sure we ignore ones where activeJob.properties is null.
> We should also make sure it works if the particular property is missing.
> https://github.com/apache/spark/blob/branch-1.3/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#L678
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