NPE in AM causes it to lose containers which are never returned back to RM
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Key: MAPREDUCE-2693
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2693
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2
Reporter: Amol Kekre
Priority: Critical
Fix For: 0.23.0
The following exception in AM of an application at the top of queue causes
this. Once this happens, AM keeps obtaining
containers from RM and simply loses them. Eventually on a cluster with multiple
jobs, no more scheduling happens
because of these lost containers.
It happens when there are blacklisted nodes at the app level in AM. A bug in AM
(RMContainerRequestor.containerFailedOnHost(hostName)) is causing this - nodes
are simply getting removed from the
request-table. We should make sure RM also knows about this update.
========================================================================
11/06/17 06:11:18 INFO rm.RMContainerAllocator: Assigned based on host match
98.138.163.34
11/06/17 06:11:18 INFO rm.RMContainerRequestor: BEFORE decResourceRequest:
applicationId=30 priority=20
resourceName=... numContainers=4978 #asks=5
11/06/17 06:11:18 INFO rm.RMContainerRequestor: AFTER decResourceRequest:
applicationId=30 priority=20
resourceName=... numContainers=4977 #asks=5
11/06/17 06:11:18 INFO rm.RMContainerRequestor: BEFORE decResourceRequest:
applicationId=30 priority=20
resourceName=... numContainers=1540 #asks=5
11/06/17 06:11:18 INFO rm.RMContainerRequestor: AFTER decResourceRequest:
applicationId=30 priority=20
resourceName=... numContainers=1539 #asks=6
11/06/17 06:11:18 ERROR rm.RMContainerAllocator: ERROR IN CONTACTING RM.
java.lang.NullPointerException
at
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerRequestor.decResourceRequest(RMContainerRequestor.java:246)
at
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerRequestor.decContainerReq(RMContainerRequestor.java:198)
at
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator$ScheduledRequests.assign(RMContainerAllocator.java:523)
at
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator$ScheduledRequests.access$200(RMContainerAllocator.java:433)
at
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator.heartbeat(RMContainerAllocator.java:151)
at
org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator$1.run(RMCommunicator.java:220)
at java.lang.Thread.run(Thread.java:619)
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