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https://issues.apache.org/jira/browse/PIG-872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Olga Natkovich updated PIG-872:
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    Status: Patch Available  (was: Open)

resubmitting the patch. looks like we had problems running tests

> use distributed cache for the replicated data set in FR join
> ------------------------------------------------------------
>
>                 Key: PIG-872
>                 URL: https://issues.apache.org/jira/browse/PIG-872
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Olga Natkovich
>            Assignee: Sriranjan Manjunath
>         Attachments: PIG_872.patch.1
>
>
> Currently, the replicated file is read directly from DFS by all maps. If the 
> number of the concurrent maps is huge, we can overwhelm the NameNode with 
> open calls.
> Using distributed cache will address the issue and might also give a 
> performance boost since the file will be copied locally once and the reused 
> by all tasks running on the same machine.
> The basic approach would be to use cacheArchive to place the file into the 
> cache on the frontend and on the backend, the tasks would need to refer to 
> the data using path from the cache.
> Note that cacheArchive does not work in Hadoop local mode. (Not a problem for 
> us right now as we don't use it.)

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