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From Apache Wiki <wikidi...@apache.org>
Subject [Lucene-hadoop Wiki] Update of "FAQ" by OwenOMalley
Date Wed, 10 Oct 2007 17:51:42 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Lucene-hadoop Wiki" for change notification.

The following page has been changed by OwenOMalley:

     * ''mapred.tasktracker.tasks.maximum'' that is a cluster-wide limit i.e. controlled at
the !JobTracker end. [http://issues.apache.org/jira/browse/HADOOP-1245 HADOOP-1245] should
fix that.
     * ''mapred.tasktracker.tasks.maximum'' controls the number of maps '''and''' number of
reduces (independently). [http://issues.apache.org/jira/browse/HADOOP-1274 HADOOP-1274] should
fix that.
+ [[BR]]
+ [[Anchor(13)]]
+ '''13. [#13 Submitting map/reduce jobs as a different user doesn't work.]'''
+ The problem is that you haven't configured your map/reduce system  
+ directory to a fixed value. The default works for single node systems, but not for  
+ "real" clusters. I like to use:
+ {{{
+ <property>
+    <name>mapred.system.dir</name>
+    <value>/hadoop/mapred/system</value>
+    <description>The shared directory where MapReduce stores control files.
+    </description>
+ </property>
+ }}}
+ Note that this directory is in your default file system and must be  
+ accessible from both the client and server machines and is typically  
+ in HDFS.

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