[
https://issues.apache.org/jira/browse/MAPREDUCE-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Mahadev konar updated MAPREDUCE-1521:
-------------------------------------
Status: Patch Available (was: Open)
> Protection against incorrectly configured reduces
> -------------------------------------------------
>
> Key: MAPREDUCE-1521
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1521
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker
> Reporter: Arun C Murthy
> Assignee: Mahadev konar
> Priority: Critical
> Fix For: 0.22.0
>
> Attachments: MAPREDUCE-1521-0.20-yahoo.patch,
> MAPREDUCE-1521-0.20-yahoo.patch, MAPREDUCE-1521-0.20-yahoo.patch,
> MAPREDUCE-1521-0.20-yahoo.patch, MAPREDUCE-1521-0.20-yahoo.patch,
> MAPREDUCE-1521-trunk.patch
>
>
> We've seen a fair number of instances where naive users process huge
> data-sets (>10TB) with badly mis-configured #reduces e.g. 1 reduce.
> This is a significant problem on large clusters since it takes each attempt
> of the reduce a long time to shuffle and then run into problems such as local
> disk-space etc. Then it takes 4 such attempts.
> Proposal: Come up with heuristics/configs to fail such jobs early.
> Thoughts?
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
