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https://issues.apache.org/jira/browse/HADOOP-8327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266006#comment-13266006
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Dave Thompson commented on HADOOP-8327:
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Logalyzer and TestCopyFiles are two utilities that depend on distcp V1, and
further use an incompatible constructor. I suggest renaming the DistCp (v1)
class to DistCPV1 for now, which will prevent random distcp failures from the
above problem, and not affect those utilities that still depend on DistCpV1.
Further any external utilities that use this class will be flushed out, but the
class will still be accessible (though now called DistCpV1).
DistCp (v2) will still remain (untouched) as DistCp.
> 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
>
> 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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