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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-1786) mapred.system.dir parameter needs documentation
Date Sun, 17 Jul 2011 12:15:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J resolved HADOOP-1786.
-----------------------------

    Resolution: Fixed
      Assignee: Harsh J

This is more of an FAQ thing.

I've added an entry as:
http://wiki.apache.org/hadoop/FAQ#Why_is_the_.27hadoop.tmp.dir.27_config_default_user.name_dependent.3F

> mapred.system.dir parameter needs documentation
> -----------------------------------------------
>
>                 Key: HADOOP-1786
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1786
>             Project: Hadoop Common
>          Issue Type: Task
>          Components: conf, documentation
>    Affects Versions: 0.14.0
>            Reporter: Thomas Friol
>            Assignee: Harsh J
>
> Following a user@ discussion :
> {noformat}
> Thomas Friol wrote:
> > Other question, : Why the 'hadoop.tmp.dir' is user.name dependant ?
> We need a directory that a user can write and also not to interfere with other users.
 
> If we didn't include the username, then different users would share the same tmp directory.
 
> This can cause authorization problems, if folks' default umask doesn't permit write by
others.  
> It can also result in folks stomping on each other, when they're, e.g., playing with
HDFS and
> re-format their filesystem.
> We should better document configuring things for fully distributed operation.  In particular,

> we should probably recommend setting mapred.system.dir in the "Fully Distributed Operation"
section of:
> http://lucene.apache.org/hadoop/api/overview-summary.html#overview_description
> The wiki should also probably describe this better. 
> {noformat}

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