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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1032) Support for caching Job JARs
Date Fri, 02 Mar 2007 20:04:51 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1032?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Doug Cutting updated HADOOP-1032:

    Resolution: Fixed
      Assignee: Gautam Kowshik
        Status: Resolved  (was: Patch Available)

I just committed this.  Thanks, Guatam!

> Support for caching Job JARs 
> -----------------------------
>                 Key: HADOOP-1032
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1032
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: mapred
>    Affects Versions: 0.11.2
>            Reporter: Gautam Kowshik
>         Assigned To: Gautam Kowshik
>            Priority: Minor
>             Fix For: 0.12.0
>         Attachments: HADOOP-1032.patch, HADOOP-1032_2.patch, HADOOP-1032_3.patch, HADOOP-1032_4.patch
> Often jobs need to be rerun number of times.. like a job that reads from crawled data
time and again.. so having to upload job jars to every node is cumbersome. We need a caching
mechanism to boost performance. Here are the features for job specific caching of jars/conf
>  - Ability to resubmit jobs with jars without having to propagate same jar to all nodes.
>     The idea is to keep a store(path mentioned by user in job.xml?) local to the task
node so as to speed up task initiation on tasktrackers. Assumes that the jar does not change
during an MR task.
> - An independent DFS store to upload jars to (Distributed File Cache?).. that does not
cleanup between jobs.
>     This might need user level configuration to indicate to the jobclient to upload files
to DFSCache instead of the DFS. https://issues.apache.org/jira/browse/HADOOP-288 facilitates
this. Our local cache can be client to the DFS Cache.
> - A standard cache mechanism that checks for changes in the local store and picks from
dfs if found dirty.
>    This does away with versioning. The DFSCache supports a md5 checksum check, we can
use that.
> Anything else? Suggestions? Thoughts?

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