Wei-Chiu Chuang created HDFS-9781:
-------------------------------------
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()}}
{noformat}
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
{noformat}
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