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https://issues.apache.org/jira/browse/HADOOP-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12514998
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Dennis Kubes commented on HADOOP-1622:
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Remember that multiple jars is really just a front end merge before a single
merged job jar file is submitted to the MR system. We still have to set a
single job jar (currently through setJar) and the various job runners and task
trackers need to get that single jar (currently through getJar). So if we are
going to deprecate getJar and setJar, then we will need to change how we set
and get the final job jar throughout the system.
The other changes and recommendations have been made and I am doing final
testing. If we can get a consensus on the get and set jar methods I can have a
new candidate patch uploaded today.
> Hadoop should provide a way to allow the user to specify jar file(s) the user
> job depends on
> --------------------------------------------------------------------------------------------
>
> Key: HADOOP-1622
> URL: https://issues.apache.org/jira/browse/HADOOP-1622
> Project: Hadoop
> Issue Type: Improvement
> Reporter: Runping Qi
> Attachments: multipleJobJars.patch
>
>
> More likely than not, a user's job may depend on multiple jars.
> Right now, when submitting a job through bin/hadoop, there is no way for the
> user to specify that.
> A walk around for that is to re-package all the dependent jars into a new jar
> or put the dependent jar files in the lib dir of the new jar.
> This walk around causes unnecessary inconvenience to the user. Furthermore,
> if the user does not own the main function
> (like the case when the user uses Aggregate, or datajoin, streaming), the
> user has to re-package those system jar files too.
> It is much desired that hadoop provides a clean and simple way for the user
> to specify a list of dependent jar files at the time
> of job submission. Someting like:
> bin/hadoop .... --depending_jars j1.jar:j2.jar
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