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  1. Hadoop HDFS
  2. HDFS-8770

ReplicationMonitor thread received Runtime exception: NullPointerException when BlockManager.chooseExcessReplicates

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Critical
    • Resolution: Duplicate
    • Affects Version/s: 2.6.0, 2.7.0
    • Fix Version/s: None
    • Component/s: namenode
    • Labels:
      None

      Description

      Namenode shutdown when ReplicationMonitor thread received Runtime exception:

      2015-07-08 16:43:55,167 ERROR org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: ReplicationMonitor thread received Runtime exception.
      java.lang.NullPointerException
      at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy.adjustSetsWithChosenReplica(BlockPlacementPolicy.java:189)
      at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseExcessReplicates(BlockManager.java:2911)
      at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.processOverReplicatedBlock(BlockManager.java:2849)
      at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.processMisReplicatedBlock(BlockManager.java:2780)
      at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.rescanPostponedMisreplicatedBlocks(BlockManager.java:1931)
      at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:3628)
      at java.lang.Thread.run(Thread.java:744)

      We use hadoop-2.6.0 configured with heterogeneous storages and setStoragePolicy some path One_SSD. When a block has excess replicated like 2 SSD replica on different rack(exactlyOne set) and 2 Disk on same rack(moreThanOne set), BlockPlacementPolicyDefault.chooseReplicaToDelete return null because only moreThanOne set be chosen to find SSD replica

        Attachments

        1. HDFS-8770_v1.patch
          2 kB
          chunde

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              • Assignee:
                aderen chunde
                Reporter:
                aderen chunde
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