Set number of map slots per tasktracker to 8 in order to run 8 map tasks on one machine (assuming one tasktracker per machine) at the same time:
<property> <name>mapred.tasktracker.map.tasks.maximum</name> <value>8</value> <description>The maximum number of map tasks that will be run simultaneously by a task tracker. </description> </property> -----Original Message----- From: Deepak Diwakar [mailto:[EMAIL PROTECTED] Sent: Monday, July 07, 2008 1:29 AM To: core-user@hadoop.apache.org Subject: parallel mapping on single server Hi, I am pretty naive to hadoop. I ran a modification of wordcount on almost a TB data on single server, but found that it takes too much time. Actually i found that at a time only one core is utilized even though my server is of 8 cores. I read that hadoop speeds up computation in DFS mode.But how to make full utilization of a single server with multicore processors? Is there in pseudo dfs mode in hadoop? What are the changes required in config files .Please let me know in detail. Is there anything to do with hadoop-site.xml and mapred-default.xml? Thanks in advance. -- - Deepak Diwakar, Associate Software Eng., Pubmatic, pune Contact: +919960930405
