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From "Thomas Friol (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1786) mapred.system.dir parameter nees documentation
Date Mon, 27 Aug 2007 11:45:31 GMT
mapred.system.dir parameter nees documentation
----------------------------------------------

                 Key: HADOOP-1786
                 URL: https://issues.apache.org/jira/browse/HADOOP-1786
             Project: Hadoop
          Issue Type: Task
          Components: conf, documentation
    Affects Versions: 0.14.0
            Reporter: Thomas Friol


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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