hadoop 動態調整mapred參數

bin/hadoop job -set-reduce-capacity job_20151126032920_1142443 1000        調成map數
bin/hadoop job -set-priority job_20151126032920_1160549 VERY_HIGH          調整優先級
bin/hadoop job -set-map-capacity job_20151126032920_1142443 1000--------------------------------------：$ bin/hadoop job                                                  Usage: JobClient <command> <args>        [-submit <job-file>]        [-status <job-id>]        [-info <job-id>]        [-counter <job-id> <group-name> <counter-name>]        [-kill <job-id>]        [-abort <job-id>]        [-suspend <job-id> [hours]]        [-recover <job-id> [-force] [-jobconf name=value] [-file local-path] [-cacheArchive] [-cacheFile]]        [-set-priority <job-id> <priority>]. Valid values for priorities are: VERY_HIGH HIGH NORMAL LOW VERY_LOW        [-set-map-capacity <job-id> <map-capacity> [ <vertex-id> ] ]        [-set-reduce-capacity <job-id> <reduce-capacity> [ <vertex-id> ] ]        [-set-map-over-capacity <job-id> <true/false> [ <vertex-id> ] ]        [-set-reduce-over-capacity <job-id> <true/false> [ <vertex-id> ] ]        [-events <job-id> <from-event-#> <#-of-events>]        [-history <jobOutputDir>]        [-list [all]]        [-kill-task <task-id>]        [-fail-task <task-id>]        [-schedule-task <task-id>]        [-input-add <job-id> <input>  [ <vertex-id> ] ]        [-input-done <job-id>  [ <vertex-id> ] ]        [-reload-limit-conf]         [-idle-failover <job-id>] Generic options supported are-conf <configuration file>     specify an application 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 isbin/hadoop command [genericOptions] [commandOptions]