[YARN-6801] NPE in RM while setting collectors map in NodeHeartbeatResponse

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: YARN-5355, YARN-5355-branch-2
• Fix Version/s: 2.9.0, YARN-5355, 3.0.0-beta1, YARN-5355-branch-2
• Component/s: timelineserver
• Hadoop Flags: Reviewed
• Assignee: Vrushali C
• Reporter: Vrushali C
• Created: 11/Jul/17 01:55
• Updated: 21/Oct/17 06:05
• Resolved: 11/Jul/17 12:40

Description

Null Pointer Exception seen in ResourceTrackerService#setAppCollectorsMapToResponse call

2017-06-22 22:24:01,437 WARN org.apache.hadoop.ipc.Server: IPC Server handler 49 on 8031, call org.apache.hadoop.yarn.server.api.ResourceTrackerPB.nodeHeartbeat from 10.35.172.116:44399 Call#3929 Retry#0
java.lang.NullPointerException
        at org.apache.hadoop.yarn.server.resourcemanager.ResourceTrackerService.setAppCollectorsMapToResponse(ResourceTrackerService.java:467)
        at org.apache.hadoop.yarn.server.resourcemanager.ResourceTrackerService.nodeHeartbeat(ResourceTrackerService.java:447)
        at org.apache.hadoop.yarn.server.api.impl.pb.service.ResourceTrackerPBServiceImpl.nodeHeartbeat(ResourceTrackerPBServiceImpl.java:68)
        at org.apache.hadoop.yarn.proto.ResourceTracker$ResourceTrackerService$2.callBlockingMethod(ResourceTracker.java:81)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:619)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:962)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2084)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2080)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:415)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1645)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2078)

It correlates to RM invoking setAppCollectorsMapToResponse and calling

      AppCollectorData appCollectorData = rmApps.get(appId).getCollectorData();

If the app object is not present in the list of running app ids, then this will throw NPE.

Filing jira to fix it.