GenericOptionsParser is a utility to parse command line arguments generic to the Hadoop framework. GenericOptionsParser recognizes several standarad command line arguments, enabling applications to easily specify a namenode, a jobtracker, additional configuration resources etc. The supported generic options are:
-conf <configuration file> specify a configuration file -D <property=value> use value for given property -fs <local|namenode:port> specify a namenode -jt <local|jobtracker:port> specify a job tracker -files <comma separated list of files> specify comma separated files to be copied to the map reduce cluster -libjars <comma separated list of jars> specify comma separated jar files to include in the classpath. -archives <comma separated list of archives> specify comma separated archives to be unarchived on the compute machines.
The general command line syntax is:
bin/hadoop command [genericOptions] [commandOptions]
Generic command line arguments might modify Configuration objects, given to constructors.
The functionality is implemented using Commons CLI.
Examples:
@see Tool @see ToolRunner$ bin/hadoop dfs -fs darwin:8020 -ls /data list /data directory in dfs with namenode darwin:8020 $ bin/hadoop dfs -D fs.default.name=darwin:8020 -ls /data list /data directory in dfs with namenode darwin:8020 $ bin/hadoop dfs -conf hadoop-site.xml -ls /data list /data directory in dfs with conf specified in hadoop-site.xml $ bin/hadoop job -D mapred.job.tracker=darwin:50020 -submit job.xml submit a job to job tracker darwin:50020 $ bin/hadoop job -jt darwin:50020 -submit job.xml submit a job to job tracker darwin:50020 $ bin/hadoop job -jt local -submit job.xml submit a job to local runner $ bin/hadoop jar -libjars testlib.jar -archives test.tgz -files file.txt inputjar args job submission with libjars, files and archives
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