[jira] [Created] (FLINK-1533) NullPointerException in SlotSharingGroupAssignment.addSharedSlotAndAllocateSubSlot

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-1533:
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             Summary: 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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