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From "Jothi Padmanabhan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4396) sort on 400 nodes is now slower than in 18
Date Thu, 16 Oct 2008 16:33:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640211#action_12640211
] 

Jothi Padmanabhan commented on HADOOP-4396:
-------------------------------------------

I see what you mean. This is a regular sort application and I do not think IFile writes or
reads being greater than 128K, which is the io.file.buffer.size I have been using. Or may
be I am wrong...

> 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
>
>         Attachments: 4396-v3.patch
>
>
> 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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