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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} -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira