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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5843) DFSClient.getFileChecksum() throws IOException if checksum is disabled
Date Tue, 28 Jan 2014 08:27:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883894#comment-13883894

Hadoop QA commented on HDFS-5843:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:


    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/5960//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5960//console

This message is automatically generated.

> 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
>         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-
> 	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)) -
error processing BLOCK_CHECKSUM operation  src: / dest: /
> 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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