zhengchenyu created HDFS-15237:
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Summary: Get checksum of EC file failed, when some block is
missing or corrupt
Key: HDFS-15237
URL: https://issues.apache.org/jira/browse/HDFS-15237
Project: Hadoop HDFS
Issue Type: Bug
Components: ec, hdfs
Affects Versions: 3.2.1
Reporter: zhengchenyu
Fix For: 3.2.2
When we distcp from an ec directory to another one, I found some error like
this.
{code}
2020-03-20 20:18:21,366 WARN [main] org.apache.hadoop.hdfs.FileChecksumHelper:
src=/EC/6-3/****/000325_0,
datanodes[6]=DatanodeInfoWithStorage[10.200.128.40:9866,DS-65ac4407-9d33-4c59-8f72-dd1d80d26d9f,DISK]2020-03-20
20:18:21,366 WARN [main] org.apache.hadoop.hdfs.FileChecksumHelper:
src=/EC/6-3/****/000325_0,
datanodes[6]=DatanodeInfoWithStorage[10.200.128.40:9866,DS-65ac4407-9d33-4c59-8f72-dd1d80d26d9f,DISK]java.io.EOFException:
Unexpected EOF while trying to read response from server at
org.apache.hadoop.hdfs.protocolPB.PBHelperClient.vintPrefixed(PBHelperClient.java:550)
at
org.apache.hadoop.hdfs.FileChecksumHelper$StripedFileNonStripedChecksumComputer.tryDatanode(FileChecksumHelper.java:709)
at
org.apache.hadoop.hdfs.FileChecksumHelper$StripedFileNonStripedChecksumComputer.checksumBlockGroup(FileChecksumHelper.java:664)
at
org.apache.hadoop.hdfs.FileChecksumHelper$StripedFileNonStripedChecksumComputer.checksumBlocks(FileChecksumHelper.java:638)
at
org.apache.hadoop.hdfs.FileChecksumHelper$FileChecksumComputer.compute(FileChecksumHelper.java:252)
at
org.apache.hadoop.hdfs.DFSClient.getFileChecksumInternal(DFSClient.java:1790)
at
org.apache.hadoop.hdfs.DFSClient.getFileChecksumWithCombineMode(DFSClient.java:1810)
at
org.apache.hadoop.hdfs.DistributedFileSystem$33.doCall(DistributedFileSystem.java:1691)
at
org.apache.hadoop.hdfs.DistributedFileSystem$33.doCall(DistributedFileSystem.java:1688)
at
org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at
org.apache.hadoop.hdfs.DistributedFileSystem.getFileChecksum(DistributedFileSystem.java:1700)
at
org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.doCopy(RetriableFileCopyCommand.java:138)
at
org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.doExecute(RetriableFileCopyCommand.java:115)
at
org.apache.hadoop.tools.util.RetriableCommand.execute(RetriableCommand.java:87)
at
org.apache.hadoop.tools.mapred.CopyMapper.copyFileWithRetry(CopyMapper.java:259)
at org.apache.hadoop.tools.mapred.CopyMapper.map(CopyMapper.java:220) at
org.apache.hadoop.tools.mapred.CopyMapper.map(CopyMapper.java:48) at
org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146) at
org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:799) at
org.apache.hadoop.mapred.MapTask.run(MapTask.java:347) at
org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:174) at
java.security.AccessController.doPrivileged(Native Method) at
javax.security.auth.Subject.doAs(Subject.java:422) at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1730)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:168)
{code}
And Then I found some error in datanode like this
{code}
2020-03-20 20:54:16,573 INFO
org.apache.hadoop.hdfs.protocol.datatransfer.sasl.SaslDataTransferClient: SASL
encryption trust check: localHostTrusted = false, remoteHostTrusted = false
2020-03-20 20:54:16,577 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode:
bd-hadoop-128050.zeus.lianjia.com:9866:DataXceiver error processing
BLOCK_GROUP_CHECKSUM operation src: /10.201.1.38:33264 dst: /10.200.128.50:9866
java.lang.UnsupportedOperationException
at java.nio.ByteBuffer.array(ByteBuffer.java:994)
at
org.apache.hadoop.hdfs.server.datanode.erasurecode.StripedBlockChecksumReconstructor.reconstruct(StripedBlockChecksumReconstructor.java:90)
at
org.apache.hadoop.hdfs.server.datanode.BlockChecksumHelper$BlockGroupNonStripedChecksumComputer.recalculateChecksum(BlockChecksumHelper.java:711)
at
org.apache.hadoop.hdfs.server.datanode.BlockChecksumHelper$BlockGroupNonStripedChecksumComputer.compute(BlockChecksumHelper.java:489)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.blockGroupChecksum(DataXceiver.java:1047)
at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opStripedBlockChecksum(Receiver.java:327)
at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:119)
at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:292)
at java.lang.Thread.run(Thread.java:748)
{code}
The reason is that: When some block is missing or corrupt, datanode will
trigger to call recalculateChecksum. But if
StripedBlockChecksumReconstructor.targetBuffer is DirectByteBuffer, we couldn't
use DirectByteBuffer.array(), so throw the exception. Then we could't get
checksum.
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