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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4421) Remove dependency on deployed MR jars
Date Wed, 15 Aug 2012 21:43:38 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435553#comment-13435553
] 

Alejandro Abdelnur commented on MAPREDUCE-4421:
-----------------------------------------------

Let me explain in more detail what I was thinking (along the lines of Oozie's sharelib for
actions):

*1* OPS maintains a {{/user/am/share/lib/}} directory under this directory you have a sub-directory
for each AM, ie: {{mapred}}, {{distributedshell}}

*2* {{yarn-site.xml}} (or an {{am-site.xml}}) defines the following properties:

{code}
yarn.am.lib=/user/am/share/lib
mapred.am.lib=${yarn.am.lib}/mapred
distributedshell.am.lib=${yarn.am.lib}/distributedshell
{code}

*3* AM client injects to the configuration, via DistributedCache, all the JARs in the directory
of the corresponding {{####.am.lib}} property. 

Note that this mechanism allows to support multiple versions of AMs, to OPs to define the
default version, to even fix it with final, and to users to use alternate ones.



                
> Remove dependency on deployed MR jars
> -------------------------------------
>
>                 Key: MAPREDUCE-4421
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4421
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 2.0.0-alpha
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>
> Currently MR AM depends on MR jars being deployed on all nodes via implicit dependency
on YARN_APPLICATION_CLASSPATH. 
> We should stop adding mapreduce jars to YARN_APPLICATION_CLASSPATH and, probably, just
rely on adding a shaded MR jar along with job.jar to the dist-cache.

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