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From "Haijun Cao" <hai...@kindsight.net>
Subject RE: Sharing Hadoop cluster among multiple users
Date Thu, 26 Jun 2008 19:19:15 GMT
Is it because you leave the mapred.system.dir as default (see


-----Original Message-----
From: YongChul Kwon [mailto:godslord@gmail.com] 
Sent: Thursday, June 26, 2008 12:10 PM
To: core-user@hadoop.apache.org
Subject: Sharing Hadoop cluster among multiple users

Hello all,

I deployed hadoop to a small cluster. The HDFS is running as user A.
Now user B comes in and wants to run a simple Map-Reduce task. The
Map-Reduce client creates all shared files in correct location
'/tmp/hadoop-B/mapred/system/...'. However, JobTracker, running as
user A, always tries to read the job related files from

The questions are following.
a) Does everybody who wants to run map-reduce job have to launch one's
own JobTracker?
b) Do I have to set HOD for this? I really don't want to do this extra
since B is currently the only user running Map-Reduce.

Thank you,

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