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https://issues.apache.org/jira/browse/PIG-1218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Richard Ding updated PIG-1218:
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Attachment: PIG-1218_3.patch
The patch 3 includes all of patch 2 plus distributed cache for merge join's
index file (PIG-1079).
> Use distributed cache to store samples
> --------------------------------------
>
> Key: PIG-1218
> URL: https://issues.apache.org/jira/browse/PIG-1218
> Project: Pig
> Issue Type: Improvement
> Reporter: Olga Natkovich
> Assignee: Richard Ding
> Fix For: 0.7.0
>
> Attachments: PIG-1218.patch, PIG-1218_2.patch, PIG-1218_3.patch
>
>
> Currently, in the case of skew join and order by we use sample that is just
> written to the dfs (not distributed cache) and, as the result, get opened and
> copied around more than necessary. This impacts query performance and also
> places unnecesary load on the name node
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