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https://issues.apache.org/jira/browse/HADOOP-1786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Friol updated HADOOP-1786:
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Summary: mapred.system.dir parameter needs documentation (was:
mapred.system.dir parameter nees documentation)
> mapred.system.dir parameter needs 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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