[
https://issues.apache.org/jira/browse/PIG-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Rohini Palaniswamy updated PIG-4587:
------------------------------------
Fix Version/s: 0.15.1
Committing the patch to branch-0.15 as well. PIG-4587-1-branch-0.15.patch is
the patch committed to branch 0.15 which does not contain the TezVertexStats
and TezDAGStats changes due to lot of conflict. Those are unrelated
enhancements anyways.
> Applying isFirstReduceOfKey for Skewed left outer join skips records
> --------------------------------------------------------------------
>
> Key: PIG-4587
> URL: https://issues.apache.org/jira/browse/PIG-4587
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.15.0
> Reporter: Rohini Palaniswamy
> Assignee: Daniel Dai
> Priority: Critical
> Fix For: 0.16.0, 0.15.1
>
> Attachments: PIG-4587-1-branch-0.15.patch, PIG-4587-1.patch
>
>
> PIG-4377 introduced isFirstReduceOfKey to avoid extra records in case of over
> sampling. But the issue can occur only in the case of right outer join. But
> it is added to the plan in MRCompiler and TezCompiler (PIG-4580) for both
> left and right outer joins. We need to remove that extra check for right
> outer join. It is unnecessary performance penalty.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
