[MAPREDUCE-6213] NullPointerException caused by job history server addr not resolvable

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: applicationmaster
• Hadoop Flags: Reviewed
• Assignee: Peng Zhang
• Reporter: Peng Zhang
• Created: 08/Jan/15 08:25
• Updated: 30/Aug/16 01:19
• Resolved: 21/Mar/15 21:16

Description

When DNS failed for a time, all MapReduce jobs which completed during that time got failed. Log as below:

2015-01-08 01:26:44,968 ERROR [Thread-856] org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Exception while unregistering 
java.lang.NullPointerException
    at org.apache.hadoop.mapreduce.v2.util.MRWebAppUtil.getApplicationWebURLOnJHSWithoutScheme(MRWebAppUtil.java:135)
    at org.apache.hadoop.mapreduce.v2.util.MRWebAppUtil.getApplicationWebURLOnJHSWithScheme(MRWebAppUtil.java:150)
    at org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator.doUnregistration(RMCommunicator.java:212)
    at org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator.unregister(RMCommunicator.java:182)
    at org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator.serviceStop(RMCommunicator.java:255)
    at org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator.serviceStop(RMContainerAllocator.java:257)
    at org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
    at org.apache.hadoop.service.ServiceOperations.stop(ServiceOperations.java:52)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$ContainerAllocatorRouter.serviceStop(MRAppMaster.java:823)
    at org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
    at org.apache.hadoop.service.ServiceOperations.stop(ServiceOperations.java:52)
    at org.apache.hadoop.service.ServiceOperations.stopQuietly(ServiceOperations.java:80)
    at org.apache.hadoop.service.CompositeService.stop(CompositeService.java:157)
    at org.apache.hadoop.service.CompositeService.serviceStop(CompositeService.java:131)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceStop(MRAppMaster.java:1471)
    at org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.stop(MRAppMaster.java:1085)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.shutDownJob(MRAppMaster.java:554)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$JobFinishEventHandler$1.run(MRAppMaster.java:605)