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https://issues.apache.org/jira/browse/TEZ-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V updated TEZ-1073:
-------------------------
Fix Version/s: 0.5.0
Status: Patch Available (was: Open)
Tested with RLE IFiles and found to be good for ETL with low key cardinality
(partitioned insert)
> RLE IFile merge() fastpath
> --------------------------
>
> Key: TEZ-1073
> URL: https://issues.apache.org/jira/browse/TEZ-1073
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.5.0
> Reporter: Gopal V
> Assignee: Gopal V
> Priority: Minor
> Fix For: 0.5.0
>
> Attachments: TEZ-1073.1.patch, TEZ-1073.WIP.patch
>
>
> IFile iterators actually consist of a tri-state - NEW_KEY, SAME_KEY and
> NO_KEY.
> This can be used to avoid rebalancing the priority queue when the same reader
> is returning SAME_KEY in its reader during the initial merge operation in the
> reducer.
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