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Posted to hdfs-dev@hadoop.apache.org by "Akira Ajisaka (Jira)" <ji...@apache.org> on 2020/11/04 05:43:00 UTC
[jira] [Resolved] (HDFS-15237) Get checksum of EC file failed, when
some block is missing or corrupt
[ https://issues.apache.org/jira/browse/HDFS-15237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Akira Ajisaka resolved HDFS-15237.
----------------------------------
Fix Version/s: (was: 3.2.2)
Assignee: (was: zhengchenyu)
Resolution: Duplicate
The fix seems the same as HDFS-15643. Closing this as duplicate.
Thanks [~zhengchenyu].
> 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
> Priority: Blocker
> Labels: pull-request-available
> Attachments: HDFS-15237.001.patch
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> 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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