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Devaraj Das commented on HADOOP-4396:
-------------------------------------
Yes this issue doesn't show up with the 0.19 branch just prior to HADOOP-3514 commit, at least
it is not obvious. In the current case the map phase in sort400 is longer due to a handful
of stragglers and all of them seems to be taking a long time to read the dfs input.
> sort on 400 nodes is now slower than in 18
> ------------------------------------------
>
> Key: HADOOP-4396
> URL: https://issues.apache.org/jira/browse/HADOOP-4396
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: Jothi Padmanabhan
> Assignee: Jothi Padmanabhan
> Priority: Blocker
> Fix For: 0.19.0
>
>
> Sort on 400 nodes on hadoop release 18 takes about 29 minutes, but with the 19 branch
takes about 32 minutes. This behavior is consistent.
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