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: http://wiki.apache.org/lucene-hadoop/FAQ ------------------------------------------------------------------------------ * ''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. +
