[MAPREDUCE-5867] Possible NPE in KillAMPreemptionPolicy related to ProportionalCapacityPreemptionPolicy

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3.0
• Fix Version/s: 3.0.0-alpha1
• Component/s: resourcemanager
• Hadoop Flags: Reviewed
• Assignee: Sunil G
• Reporter: Sunil G
• Created: 24/Apr/14 12:45
• Updated: 12/May/16 18:23
• Resolved: 19/May/14 06:49

Description

I configured KillAMPreemptionPolicy for My Application Master and tried to check preemption of queues.
In one scenario I have seen below NPE in my AM

014-04-24 15:11:08,860 ERROR [RMCommunicator Allocator] org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: ERROR IN CONTACTING RM.
java.lang.NullPointerException
at org.apache.hadoop.mapreduce.v2.app.rm.preemption.KillAMPreemptionPolicy.preempt(KillAMPreemptionPolicy.java:57)
at org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator.getResources(RMContainerAllocator.java:662)
at org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator.heartbeat(RMContainerAllocator.java:246)
at org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator$1.run(RMCommunicator.java:267)
at java.lang.Thread.run(Thread.java:662)

I was using 2.2.0 and merged MAPREDUCE-5189 to see how AM preemption works.