mapred.system.dir parameter nees documentation
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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 :
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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.
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