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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1622) Hadoop should provide a way to allow the user to specify jar file(s) the user job depends on
Date Wed, 18 Jul 2007 16:18:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12513637
] 

Doug Cutting commented on HADOOP-1622:
--------------------------------------

I don't disagree with any of your statements in the previous message: currently we encourage
the main to be in the top-level jar specified, which can be awkward; and, yes, it would be
more convenient to let users list multiple jars when submitting jobs.

I'm suggesting that JobClient should jar things together.  This would change the way that
the job jar is determined, and thus the relationship between the main() and user jar files
can be altered at the same time.

Users should be able to submit jobs specifying a set of jars.  That's the crux of this issue,
and I agree we ought to support it.  But I suggest that the way we ought to implement this
is to change JobClient to pack together the user's jars into a single jar, and submit this.
 Few if any changes should be required to the JobTracker or TaskTracker.  Does that make sense?
 Do you have an alternate implementation proposal?

> 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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