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https://issues.apache.org/jira/browse/MAPREDUCE-6160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14217759#comment-14217759
]
Rohith commented on MAPREDUCE-6160:
-----------------------------------
NPE trace in {{MRClientProtocol#getTaskAttemptCompletionEvents()}}
{code}
14/11/07 15:09:38 INFO mapreduce.Job: map 92% reduce 25%
14/11/07 15:09:40 INFO mapreduce.Job: map 96% reduce 25%
14/11/07 15:09:42 INFO mapreduce.Job: map 100% reduce 25%
14/11/07 15:09:43 INFO mapreduce.Job: map 100% reduce 100%
14/11/07 15:09:43 INFO mapred.ClientServiceDelegate: Application state is
completed. FinalApplicationStatus=SUCCEEDED. Redirecting to job history server
14/11/07 15:09:43 INFO mapred.ClientServiceDelegate: Application state is
completed. FinalApplicationStatus=SUCCEEDED. Redirecting to job history server
14/11/07 15:09:43 INFO mapred.ClientServiceDelegate: Application state is
completed. FinalApplicationStatus=SUCCEEDED. Redirecting to job history server
java.io.IOException:
org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException):
java.lang.NullPointerException
at
org.apache.hadoop.mapreduce.v2.hs.HistoryClientService$HSClientProtocolHandler.getTaskAttemptCompletionEvents(HistoryClientService.java:277)
at
org.apache.hadoop.mapreduce.v2.api.impl.pb.service.MRClientProtocolPBServiceImpl.getTaskAttemptCompletionEvents(MRClientProtocolPBServiceImpl.java:173)
at
org.apache.hadoop.yarn.proto.MRClientProtocol$MRClientProtocolService$2.callBlockingMethod(MRClientProtocol.java:283)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2013)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2009)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1612)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2007)
{code}
> Potential NullPointerException in MRClientProtocol interface implementation.
> ----------------------------------------------------------------------------
>
> Key: MAPREDUCE-6160
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6160
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Rohith
> Assignee: Rohith
> Attachments: MAPREDUCE-6160.patch
>
>
> In the implementation of MRClientProtocol, many methods can throw
> NullPointerExceptions. Instead of NullPointerExceptions, better to throw
> IOException with proper message.
> In the HistoryClientService class and MRClientService class has
> #verifyAndGetJob() method that return job object as null.
> {code}
> getTaskReport(GetTaskReportRequest request) throws IOException;
> getTaskAttemptReport(GetTaskAttemptReportRequest request) throws IOException;
> getCounters(GetCountersRequest request) throws IOException;
> getTaskAttemptCompletionEvents(GetTaskAttemptCompletionEventsRequest request)
> throws IOException;
> getTaskReports(GetTaskReportsRequest request) throws IOException;
> getDiagnostics(GetDiagnosticsRequest request) throws IOException;
> {code}
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