Tsz Wo (Nicholas), SZE created HDFS-4813:
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Summary: 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
Priority: Minor
TestBlocksWithNotEnoughRacks may fail occasionally due to the bug:
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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)
...
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At the end of the log:
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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)
...
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