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https://issues.apache.org/jira/browse/PIG-2672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13773742#comment-13773742
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Koji Noguchi commented on PIG-2672:
-----------------------------------
bq. Note: HADOOP-9639 has improved mechanism for this.
I haven't read the patch but I thought HADOOP-9639 introduces a security hole
unless NodeManager does the SHA-1 level checksumming.
> 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
>
> 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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