hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-968) Reduce shuffle and merge should be done a child JVM
Date Sat, 14 Apr 2007 18:12:15 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-968?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Devaraj Das updated HADOOP-968:
-------------------------------

    Attachment: 968.apr14.patch

This removes a redundant call to System.currentTimeMillis in the TaskTracker.

> Reduce shuffle and merge should be done a child JVM
> ---------------------------------------------------
>
>                 Key: HADOOP-968
>                 URL: https://issues.apache.org/jira/browse/HADOOP-968
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.10.1
>            Reporter: Owen O'Malley
>         Assigned To: Devaraj Das
>             Fix For: 0.13.0
>
>         Attachments: 968.apr06.patch, 968.apr10.patch, 968.apr14.patch, 968.apr14.patch,
968.patch
>
>
> The Reduce's shuffle and initial merge is done in the TaskTracker's JVM. It would be
better to have it run in the Task's child JVM. The advantages are:
>   1. The class path and environment would be set up correctly.
>   2. User code doesn't need to be loaded into the TaskTracker.
>   3. Lower memory usage and contention in the TaskTracker.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message