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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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Philippe Gassmann updated HADOOP-1786:
--------------------------------------
Description:
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}
was:
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}
> 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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