[jira] [Created] (MAPREDUCE-6160) Potential NullPointerException in MRClientProtocol interface implementation.

["Rohith (JIRA)" <ji...@apache.org>]

Rohith created MAPREDUCE-6160:
---------------------------------

             Summary: 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


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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