Big Data Notes

[root@localhost training]# hadoop
Usage: hadoop [–config confdir] COMMAND
where COMMAND is one of:
namenode -format     format the DFS filesystem
secondarynamenode    run the DFS secondary namenode
namenode             run the DFS namenode
datanode             run a DFS datanode
dfsadmin             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
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
oiv                  apply the offline fsimage viewer to an fsimage
classpath            prints the class path needed to get the
dfsgroups            get the groups which users belong to on the Name Node
mrgroups             get the groups which users belong to on the Job Tracker
Hadoop jar and the required libraries
daemonlog            get/set the log level for each daemon
or
CLASSNAME            run the class named CLASSNAME
Most commands print help when invoked w/o parameters.
[root@localhost training]#