Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Minor Minor
    • Resolution: Fixed
    • Affects Version/s: 0.20.1
    • Fix Version/s: 0.21.0
    • Component/s: jobtracker
    • Labels:
      None
    • Hadoop Flags:
      Reviewed
    • Release Note:
      Hide
      Fixes the NPE in 'refreshNodes', ExpiryTracker thread and heartbeat. NPE occurred in the following cases
      - a blacklisted tracker is either decommissioned or expires.
      - a lost tracker gets blacklisted


      Show
      Fixes the NPE in 'refreshNodes', ExpiryTracker thread and heartbeat. NPE occurred in the following cases - a blacklisted tracker is either decommissioned or expires. - a lost tracker gets blacklisted

      Description

      NullPointerException is obtained in Tracker Expiry Thread. Below is the exception obtained in the JT logs

      ERROR org.apache.hadoop.mapred.JobTracker: Tracker Expiry Thread got exception: java.lang.NullPointerException
              at org.apache.hadoop.mapred.JobTracker.updateTaskTrackerStatus(JobTracker.java:2971)
              at org.apache.hadoop.mapred.JobTracker.access$300(JobTracker.java:104)
              at org.apache.hadoop.mapred.JobTracker$ExpireTrackers.run(JobTracker.java:381)
              at java.lang.Thread.run(Thread.java:619)
      

      The steps to reproduce this issue are:

      • Blacklist a TT.
      • Restart it.
      • The above exception is obtained when the first instance of TT is marked as lost.

      However the above exception does not break any functionality.

      1. mapreduce-754-v1.1.patch
        10 kB
        Amar Kamat
      2. mapreduce-754-v1.2.patch
        14 kB
        Amar Kamat
      3. mapreduce-754-v2.2.1-yahoo.patch
        10 kB
        Amar Kamat
      4. mapreduce-754-v2.2.patch
        14 kB
        Amar Kamat
      5. mapreduce-754-v2.2-branch-21.patch
        15 kB
        Amar Kamat
      6. mapreduce-754-v2.2-yahoo.patch
        22 kB
        Amar Kamat
      7. mapreduce-754-wip.patch
        13 kB
        Sreekanth Ramakrishnan

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            • Assignee:
              Amar Kamat
              Reporter:
              Ramya Sunil
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              Dates

              • Created:
                Updated:
                Resolved:

                Development