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https://issues.apache.org/jira/browse/HDFS-4813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13664257#comment-13664257
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Kihwal Lee commented on HDFS-4813:
----------------------------------
[~jingzhao] Sorry, wrong person was tagged. Jing, it HDFS-4840 related?
> 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
> Affects Versions: 3.0.0
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Jing Zhao
> Priority: Minor
> Fix For: 2.0.5-beta
>
> Attachments: HDFS-4813.001.patch, HDFS-4813.002.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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