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https://issues.apache.org/jira/browse/HDFS-4813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jing Zhao updated HDFS-4813:
----------------------------
Attachment: HDFS-4813.001.patch
The test failure cannot be reproduced in my local machine, but it happened
several times during the past several days in both the trunk build and snapshot
branch build. According to the log the NPE is thrown when the replication
thread tries to access the BlocksMap#blocks. Thus we may need to set
BlocksMap#blocks as final, and/or remove "blocks = null" from
BlocksMap#close().
> BlocksMap may throw NullPointerException during shutdown
> --------------------------------------------------------
>
> Key: HDFS-4813
> URL: https://issues.apache.org/jira/browse/HDFS-4813
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Jing Zhao
> Priority: Minor
> Attachments: HDFS-4813.001.patch
>
>
> TestBlocksWithNotEnoughRacks may fail occasionally due to the bug:
> {noformat}
> java.lang.AssertionError: Test resulted in an unexpected exit
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1416)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.TestBlocksWithNotEnoughRacks.__CLR3_0_226e5kj1ntz(TestBlocksWithNotEnoughRacks.java:373)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.TestBlocksWithNotEnoughRacks.testReduceReplFactorDueToRejoinRespectsRackPolicy(TestBlocksWithNotEnoughRacks.java:330)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> ...
> {noformat}
> At the end of the log:
> {noformat}
> 2013-05-10 13:05:53,828 FATAL hdfs.MiniDFSCluster
> (MiniDFSCluster.java:shutdown(1413)) - Test resulted in an unexpected exit
> org.apache.hadoop.util.ExitUtil$ExitException: java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlocksMap.getBlockCollection(BlocksMap.java:77)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWorkForBlocks(BlockManager.java:1153)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWork(BlockManager.java:1128)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:3127)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:3089)
> at java.lang.Thread.run(Thread.java:662)
> ...
> {noformat}
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