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Posted to common-issues@hadoop.apache.org by "Dave Thompson (JIRA)" <ji...@apache.org> on 2012/05/01 23:12:48 UTC
[jira] [Updated] (HADOOP-8327) distcpv2 and distcpv1 jars should
not coexist
[ https://issues.apache.org/jira/browse/HADOOP-8327?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dave Thompson updated HADOOP-8327:
----------------------------------
Attachment: HADOOP-8327-branch-0.23.2.patch
The attached patch renames the v1 DistCp class to DistCpV1. Further, the utility dependencies that use it Logalyzer and TestCopyFiles are adjusted to use the renamed DistCpV1.
> distcpv2 and distcpv1 jars should not coexist
> ---------------------------------------------
>
> Key: HADOOP-8327
> URL: https://issues.apache.org/jira/browse/HADOOP-8327
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.23.2
> Reporter: Dave Thompson
> Assignee: Dave Thompson
> Attachments: HADOOP-8327-branch-0.23.2.patch
>
>
> Distcp v2 (hadoop-tools/hadoop-distcp/...) and Distcp v1 (hadoop-tools/hadoop-extras/...) are currently both built, and the resulting hadoop-distcp-x.jar and hadoop-extras-x.jar end up in the same class path directory. This causes some undeterministic problems, where v1 is launched when v2 is intended, or even v2 is launched, but may later fail on various nodes because of mismatch with v1.
> According to
> http://docs.oracle.com/javase/6/docs/technotes/tools/windows/classpath.html ("Understanding class path wildcards")
> "The order in which the JAR files in a directory are enumerated in the expanded class path is not specified and may vary from platform to platform and even from moment to moment on the same machine."
> Suggest distcpv1 be deprecated at this point, possibly by discontinuing build of distcpv1.
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