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From "Aniket Mokashi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2672) Optimize the use of DistributedCache
Date Tue, 24 Sep 2013 23:24:03 GMT

    [ https://issues.apache.org/jira/browse/PIG-2672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13776910#comment-13776910
] 

Aniket Mokashi commented on PIG-2672:
-------------------------------------

[~cheolsoo], thanks for your comments. I will work on the patch to make it more production
ready. I have tried it on a simple job, but not in production yet.

[~knoguchi], I do not understand your concern here. Currently jars get copied to /tmp/temp-<random>/
which can be written by all users. I do not see how jar cache is less secure than the current
approach. In fact, any misconfiguration is still protected by SHA (hard to collide).

I do not see any benefit of restricting to use /user/<username>/.pig as its not mandatory
to have that directory secure for users (Am I right?). If you look closely, cluster cache
and user cache have exactly similar behavior. The only reason we have two is for easy configuration
and better dedup of jars across the cluster.

                
> Optimize the use of DistributedCache
> ------------------------------------
>
>                 Key: PIG-2672
>                 URL: https://issues.apache.org/jira/browse/PIG-2672
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Rohini Palaniswamy
>            Assignee: Aniket Mokashi
>             Fix For: 0.12.0
>
>         Attachments: PIG-2672.patch
>
>
> Pig currently copies jar files to a temporary location in hdfs and then adds them to
DistributedCache for each job launched. This is inefficient in terms of 
>    * Space - The jars are distributed to task trackers for every job taking up lot of
local temporary space in tasktrackers.
>    * Performance - The jar distribution impacts the job launch time.  

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