[jira] Commented: (HADOOP-1622) Hadoop should provide a way to allow the user to specify jar file(s) the user job depends on

["Doug Cutting (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12513336 ] 

Doug Cutting commented on HADOOP-1622:
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This can easily be implemented by packing the user jars together into a single jar, then submitting the job with that jar, right?  I don't think the mapred kernel needs to deal with more than a single jar per job, but making the user API accept multiple jars is fine.

> 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
>
> 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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