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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5843) DFSClient.getFileChecksum() throws IOException if checksum is disabled
Date Thu, 30 Jan 2014 19:28:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13886954#comment-13886954
] 

Hudson commented on HDFS-5843:
------------------------------

SUCCESS: Integrated in Hadoop-trunk-Commit #5071 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/5071/])
HDFS-5843. DFSClient.getFileChecksum() throws IOException if checksum is disabled. Contributed
by Laurent Goujon. (jing9: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1562927)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataXceiver.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFSOutputSummer.java


> 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
>             Fix For: 2.4.0
>
>         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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