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https://issues.apache.org/jira/browse/HADOOP-4396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12639689#action_12639689
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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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