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Date: Wed, 11 Jun 2008 21:57:45 -0700 (PDT)
From: "Arun C Murthy (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-2762) Better documentation of controls for
 memory limits on hadoop daemons and Map-Reduce tasks
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     [ https://issues.apache.org/jira/browse/HADOOP-2762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arun C Murthy updated HADOOP-2762:
----------------------------------

    Status: Open  (was: Patch Available)

Amareshwari, do you mind adding some illustrative examples for the HADOOP_*_OPTS? For e.g. how to set up it so that NameNode/JobTracker have higher memory limits than Datanode/TaskTracker.

> Better documentation of controls for memory limits on hadoop daemons and Map-Reduce tasks
> -----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2762
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2762
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: documentation, mapred, scripts
>    Affects Versions: 0.16.0
>            Reporter: Arun C Murthy
>            Assignee: Amareshwari Sriramadasu
>            Priority: Blocker
>             Fix For: 0.18.0
>
>         Attachments: patch-2762.txt
>
>
> We have had a spate of questions about memory usage of hadoop daemons and Map-Reduce jobs and how to configure them. 
> We should better document *mapred.child.java.opts* in the Map-Reduce tutorial and cluser_setup.html and link to http://hadoop.apache.org/core/docs/r0.15.3/cluster_setup.html#Configuring+the+Environment+of+the+Hadoop+Daemons. 

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