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Posted to common-dev@hadoop.apache.org by "Harsh J (JIRA)" <ji...@apache.org> on 2011/07/17 14:15:00 UTC
[jira] [Resolved] (HADOOP-1786) mapred.system.dir parameter needs
documentation
[ 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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