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From "ade (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8770) ReplicationMonitor thread received Runtime exception: NullPointerException when BlockManager.chooseExcessReplicates
Date Tue, 14 Jul 2015 07:46:04 GMT
ade created HDFS-8770:
-------------------------

             Summary: ReplicationMonitor thread received Runtime exception: NullPointerException
when BlockManager.chooseExcessReplicates
                 Key: HDFS-8770
                 URL: https://issues.apache.org/jira/browse/HDFS-8770
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.7.0, 2.6.0
            Reporter: ade
            Assignee: ade
            Priority: Critical


Namenode shutdown when ReplicationMonitor thread received Runtime exception:
{quote}
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)
{quote}
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



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