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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3664) BlockManager race when stopping active services
Date Sun, 15 Jul 2012 22:43:34 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eli Collins updated HDFS-3664:
------------------------------

    Description: 
Looks like there's a race hit by the test where we try to do block management while shutting
down (eg allocate a block or compute replication work after BlocksMap#close, resulting in
an NPE).



  was:Looks like there's a race hit by the test where we try to allocate a block after BlocksMap#close,
resulting in an NPE.

        Summary: BlockManager race when stopping active services  (was: TestPersistBlocks#TestRestartDfsWithFlush
failed with NPE)

Same NPE in TestListCorruptFileBlocks.testListCorruptFileBlocksInSafeMode.


2012-07-15 21:48:39,685 INFO  namenode.FSNamesystem (FSNamesystem.java:stopActiveServices(673))
- Stopping services started for active state
2012-07-15 21:48:39,686 FATAL blockmanagement.BlockManager (BlockManager.java:run(2969)) -
ReplicationMonitor thread received Runtime exception. 
java.lang.NullPointerException
	at org.apache.hadoop.hdfs.server.blockmanagement.BlocksMap.getBlockCollection(BlocksMap.java:98)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWorkForBlocks(BlockManager.java:1097)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWork(BlockManager.java:1072)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:3000)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:2962)
	at java.lang.Thread.run(Thread.java:662)
2012-07-15 21:48:39,685 WARN  blockmanagement.DecommissionM
                
> BlockManager race when stopping active services
> -----------------------------------------------
>
>                 Key: HDFS-3664
>                 URL: https://issues.apache.org/jira/browse/HDFS-3664
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>            Reporter: Eli Collins
>
> Looks like there's a race hit by the test where we try to do block management while shutting
down (eg allocate a block or compute replication work after BlocksMap#close, resulting in
an NPE).

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