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  1. Hadoop YARN
  2. YARN-2928 YARN Timeline Service v.2: alpha 1
  3. YARN-4210

HBase reader throws NPE if Get returns no rows

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    Details

    • Type: Sub-task
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: YARN-2928
    • Fix Version/s: 2.9.0, 3.0.0-alpha1
    • Component/s: timelineserver
    • Labels:
      None
    • Target Version/s:
    • Hadoop Flags:
      Reviewed

      Description

      This JIRA handles multiple issues.

      • If HBase Get does not fetch any rows for the query, we still try to parse the result and read fields. This leads to NPE while reading metrics. We should not attempt to read anything if no row is returned i.e. result is empty.
        Found during web UI poc testing.
        2015-09-29 20:22:32,027 ERROR [95336304@qtp-1814206058-0] reader.TimelineReaderWebServices (TimelineReaderWebServices.java:handleException(199)) - Error while processing REST request
        java.lang.NullPointerException
                at org.apache.hadoop.yarn.server.timelineservice.storage.common.ColumnHelper.readResultsWithTimestamps(ColumnHelper.java:176)
                at org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowRunColumnPrefix.readResultsWithTimestamps(FlowRunColumnPrefix.java:182)
                at org.apache.hadoop.yarn.server.timelineservice.storage.TimelineEntityReader.readMetrics(TimelineEntityReader.java:212)
                at org.apache.hadoop.yarn.server.timelineservice.storage.FlowRunEntityReader.parseEntity(FlowRunEntityReader.java:136)
                at org.apache.hadoop.yarn.server.timelineservice.storage.TimelineEntityReader.readEntity(TimelineEntityReader.java:137)
                at org.apache.hadoop.yarn.server.timelineservice.storage.HBaseTimelineReaderImpl.getEntity(HBaseTimelineReaderImpl.java:72)
                at org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderManager.getEntity(TimelineReaderManager.java:93)
                at org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderWebServices.getFlowRun(TimelineReaderWebServices.java:403)
        
        
      • ResultScanner is not closed in HBase Reader.
      • Exception encountered while reading start and end time in FlowRunEntityReader

        Attachments

        1. YARN-4210-YARN-2928.03.patch
          17 kB
          Varun Saxena
        2. YARN-4210-YARN-2928.02.patch
          16 kB
          Varun Saxena
        3. YARN-4210-YARN-2928.01.patch
          4 kB
          Varun Saxena

          Activity

            People

            • Assignee:
              varun_saxena Varun Saxena
              Reporter:
              varun_saxena Varun Saxena
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              Dates

              • Created:
                Updated:
                Resolved: