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From "Azuryy(Chijiong) (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3323) Distributed Cache for Map or Reduce or Both
Date Tue, 01 Nov 2011 08:48:32 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Azuryy(Chijiong) updated MAPREDUCE-3323:

          Component/s: tasktracker
    Affects Version/s:
         Release Note: 
Tested as follow: 

1: Add cache file for map; 
2: get cache files in the configure of the map and reduce, then pring some message if map/reduce
can get cache file or not

It does work!
> Distributed Cache for Map or Reduce or Both
> -------------------------------------------
>                 Key: MAPREDUCE-3323
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3323
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: tasktracker
>    Affects Versions:
>            Reporter: Azuryy(Chijiong)
>         Attachments: dc.patch
> We put some file into Distributed Cache, but sometimes, only Map or Reduce use thses
cached files, not useful for both. but TaskTracker always download cached files from HDFS,
if there are some little bit big files in cache, it's time expensive.
> so, this patch add some new API in the DistributedCache.java as follow:
> addArchiveToClassPathForMap
> addArchiveToClassPathForReduce
> addFileToClassPathForMap
> addFileToClassPathForReduce
> addCacheFileForMap
> addCacheFileForReduce
> addCacheArchiveForMap
> addCacheArchiveForReduce
> New API doesn't affect original interface. but they are specified for only map or reduce,
not both of them.
> But if you do need cache file during both map and reduce, then use original interface.

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