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Date: Fri, 17 Aug 2012 00:05:38 +1100 (NCT)
From: "Hudson (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-8703) distcpV2: turn CRC checking off
 for 0 byte size
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    [ https://issues.apache.org/jira/browse/HADOOP-8703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435947#comment-13435947 ] 

Hudson commented on HADOOP-8703:
--------------------------------

Integrated in Hadoop-Hdfs-trunk #1136 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1136/])
    HADOOP-8703: Fix formatting issue. (Revision 1373599)
HADOOP-8703. distcpV2: turn CRC checking off for 0 byte size (Dave Thompson via bobby) (Revision 1373581)

     Result = SUCCESS
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1373599
Files : 
* /hadoop/common/trunk/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/RetriableFileCopyCommand.java

bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1373581
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/RetriableFileCopyCommand.java

                
> distcpV2: turn CRC checking off for 0 byte size
> -----------------------------------------------
>
>                 Key: HADOOP-8703
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8703
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.23.3
>            Reporter: Dave Thompson
>            Assignee: Dave Thompson
>             Fix For: 0.23.3, 2.1.0-alpha, 3.0.0
>
>         Attachments: HADOOP-8703-branch-0.23.patch, HADOOP-8703-branch-0.23.patch
>
>
> DistcpV2 (hadoop-tools/hadoop-distcp/..) can fail from checksum failure, sometimes when copying a 0 byte file. Root cause of this may have to do with an inconsistent nature of HDFS when creating 0 byte files, however distcp can avoid this issue by not checking CRC when size is zero.
> This issue was reported as part of HADOOP-8233, though it seems like a better idea to treat this particular aspect on it's own.

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