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From "Jos Backus (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BIGTOP-456) Consider splitting homedir between mapred and hdfs users?
Date Thu, 15 Mar 2012 22:52:38 GMT

    [ https://issues.apache.org/jira/browse/BIGTOP-456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230671#comment-13230671
] 

Jos Backus commented on BIGTOP-456:
-----------------------------------

Fwiw, to avoid this issue, at $work I'm going to run Hadoop daemons under a process manager
such as daemontools. Pidfiles cause all kinds of issues such as these.
                
> Consider splitting homedir between mapred and hdfs users?
> ---------------------------------------------------------
>
>                 Key: BIGTOP-456
>                 URL: https://issues.apache.org/jira/browse/BIGTOP-456
>             Project: Bigtop
>          Issue Type: Improvement
>          Components: General
>    Affects Versions: 0.1.0
>         Environment: RPMs
>            Reporter: Harsh J
>            Priority: Minor
>
> Both "mapred" and "hdfs" users have the same home dir.
> A user reported having some problems with their config management system overwriting
the "mapred" user permissions of the PID directory (Which is also its homedir) with those
of the "hdfs" user (Same homedir as "mapred" user), which causes the tasktracker process to
fail to start, since it now cannot write to the PID dir.
> Although the config system can be fixed not to do that, if both users had separate home
dirs, this would not have been a problem, and the separation would have only been logical.
> I think after the username separation Hadoop has had in packaging terms, the homedir
split does make sense.
> Its just 1/0.22 versions of Hadoop and their packages that could be affected by this.
> Presently, for 0.23+, I think we have /var/run/hadoop/ for all things HDFS (Should we
rename?) and /var/run/yarn/ for all things MapReduce2 which makes sense and should be good
enough.

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