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https://issues.apache.org/jira/browse/HDFS-5843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jing Zhao updated HDFS-5843:
----------------------------
Assignee: Laurent Goujon
> DFSClient.getFileChecksum() throws IOException if checksum is disabled
> ----------------------------------------------------------------------
>
> Key: HDFS-5843
> URL: https://issues.apache.org/jira/browse/HDFS-5843
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Reporter: Laurent Goujon
> Assignee: Laurent Goujon
> Attachments: hdfs-5843.patch
>
>
> If a file is created with checksum disabled (using {{ChecksumOpt.disabled()}}
> for example), calling {{FileSystem.getFileChecksum()}} throws the following
> IOException:
> {noformat}
> java.io.IOException: Fail to get block MD5 for
> BP-341493254-192.168.1.10-1390888724459:blk_1073741825_1001
> at org.apache.hadoop.hdfs.DFSClient.getFileChecksum(DFSClient.java:1965)
> at org.apache.hadoop.hdfs.DFSClient.getFileChecksum(DFSClient.java:1771)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$21.doCall(DistributedFileSystem.java:1186)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$21.doCall(DistributedFileSystem.java:1)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileChecksum(DistributedFileSystem.java:1194)
> [...]
> {noformat}
> From the logs, the datanode is doing some wrong arithmetics because of the
> crcPerBlock:
> {noformat}
> 2014-01-27 21:58:46,329 ERROR datanode.DataNode (DataXceiver.java:run(225)) -
> 127.0.0.1:52398:DataXceiver error processing BLOCK_CHECKSUM operation src:
> /127.0.0.1:52407 dest: /127.0.0.1:52398
> java.lang.ArithmeticException: / by zero
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.blockChecksum(DataXceiver.java:658)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opBlockChecksum(Receiver.java:169)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:77)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:221)
> at java.lang.Thread.run(Thread.java:695)
> {noformat}
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