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https://issues.apache.org/jira/browse/FLINK-1533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14318604#comment-14318604
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ASF GitHub Bot commented on FLINK-1533:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/388
> NullPointerException in
> SlotSharingGroupAssignment.addSharedSlotAndAllocateSubSlot
> ----------------------------------------------------------------------------------
>
> Key: FLINK-1533
> URL: https://issues.apache.org/jira/browse/FLINK-1533
> Project: Flink
> Issue Type: Bug
> Reporter: Till Rohrmann
>
> The scheduler can fail with a NullPointerException if it is not possible to
> allocate a {{SharedSlot}} from an {{Instance}}. In the method
> {{Scheduler.getFreeSubSlotForTask}} the allocated {{SharedSlot}} is not
> checked that it is not null. This can cause a program to fail if there is a
> race condition in scheduling different tasks on the same instance.
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