Map reduce program

Generate jar file of map reduce program .
Suppose generated jar file name is map.jar
put map.jar file in folder location abishkar\hadoop-1.2.1
Execute following commands

bin/hadoop jar map.jar WordCount /In /output

bin/hadoop fs -rmr out
bin/hadoop fs -rmr In
bin/hadoop fs -mkdir In
 bin/hadoop fs -put a.txt In
bin/hadoop jar map.jar WordCount Input output

map.jar is generated from eclipse and placed inside hadoop-1.2.1

Running task tracker

./hadoop-daemon.sh start tasktracker
./hadoop-daemon.sh start datanode

bin/start-mapred.sh

bin/hadoop-daemons.sh start tasktracker

to start task tracker 

hadoop tasktracker