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Posted to hdfs-dev@hadoop.apache.org by "Wei-Chiu Chuang (JIRA)" <ji...@apache.org> on 2016/02/09 01:04:18 UTC
[jira] [Created] (HDFS-9781) FsDatasetImpl#getBlockReports can
occasionally throw NullPointerException
Wei-Chiu Chuang created HDFS-9781:
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Summary: FsDatasetImpl#getBlockReports can occasionally throw NullPointerException
Key: HDFS-9781
URL: https://issues.apache.org/jira/browse/HDFS-9781
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode
Affects Versions: 3.0.0
Environment: Jenkins
Reporter: Wei-Chiu Chuang
Assignee: Wei-Chiu Chuang
FsDatasetImpl#getBlockReports occasionally throws NPE. The NPE caused TestFsDatasetImpl#testRemoveVolumeBeingWritten to fail, because the test waits for the call to FsDatasetImpl#getBlockReports to complete without exceptions.
Additionally, the test should be updated to identify an expected exception, using {{GenericTestUtils.assertExceptionContains()}}
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Exception in thread "Thread-20" java.lang.NullPointerException
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.getBlockReports(FsDatasetImpl.java:1709)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.TestFsDatasetImpl$1BlockReportThread.run(TestFsDatasetImpl.java:587)
2016-02-08 15:47:30,379 [Thread-21] WARN impl.TestFsDatasetImpl (TestFsDatasetImpl.java:run(606)) - Exception caught. This should not affect the test
java.io.IOException: Failed to move meta file for ReplicaBeingWritten, blk_0_0, RBW
getNumBytes() = 0
getBytesOnDisk() = 0
getVisibleLength()= 0
getVolume() = /home/weichiu/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/Nmi6rYndvr/data0/current
getBlockFile() = /home/weichiu/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/Nmi6rYndvr/data0/current/bpid-0/current/rbw/blk_0
bytesAcked=0
bytesOnDisk=0 from /home/weichiu/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/Nmi6rYndvr/data0/current/bpid-0/current/rbw/blk_0_0.meta to /home/weichiu/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/Nmi6rYndvr/data0/current/bpid-0/current/finalized/subdir0/subdir0/blk_0_0.meta
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.moveBlockFiles(FsDatasetImpl.java:857)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.BlockPoolSlice.addFinalizedBlock(BlockPoolSlice.java:295)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl.addFinalizedBlock(FsVolumeImpl.java:819)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.finalizeReplica(FsDatasetImpl.java:1620)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.finalizeBlock(FsDatasetImpl.java:1601)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.TestFsDatasetImpl$1ResponderThread.run(TestFsDatasetImpl.java:603)
Caused by: java.io.IOException: renameTo(src=/home/weichiu/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/Nmi6rYndvr/data0/current/bpid-0/current/rbw/blk_0_0.meta, dst=/home/weichiu/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/Nmi6rYndvr/data0/current/bpid-0/current/finalized/subdir0/subdir0/blk_0_0.meta) failed.
at org.apache.hadoop.io.nativeio.NativeIO.renameTo(NativeIO.java:873)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.moveBlockFiles(FsDatasetImpl.java:855)
... 5 more
2016-02-08 15:47:34,381 [Thread-19] INFO impl.FsDatasetImpl (FsVolumeList.java:waitVolumeRemoved(287)) - Volume reference is released.
2016-02-08 15:47:34,384 [Thread-19] INFO impl.TestFsDatasetImpl (TestFsDatasetImpl.java:testRemoveVolumeBeingWritten(622)) - Volumes removed
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