Thursday, April 5, 2012

Hadoop Shell Commands


namenode -format
format the DFS filesystem
secondarynamenode
run the DFS secondary namenode
namenode
run the DFS namenode
datanode
run a DFS datanode
dfsadminmradmin
run a DFS admin client
mradmin
run a Map-Reduce admin client



fsck
run a DFS filesystem checking utility
fs
run a generic filesystem user client
balancer
run a cluster balancing utility
fetchdt
fetch a delegation token from the NameNode
jobtracker
run the MapReduce job Tracker node
pipes
run a Pipes job
tasktracker
run a MapReduce task Tracker node
historyserver
run job history servers as a standalone daemon
job
manipulate MapReduce jobs
queue
get information regarding JobQueues
version
print the version
jar <jar>
run a jar file
distcp <srcurl> <desturl>
copy file or directories recursively
archive -archiveName NAME -p <parent path> <src>* <dest>
create a hadoop archive
classpath
prints the class path needed to get the Hadoop jar and the required libraries
daemonlog
get/set the log level for each daemon
-- or ---


CLASSNAME
run the class named CLASSNAME

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