bin/hadoop job -set-reduce-capacity job_20151126032920_1142443 1000 调成map数
bin/hadoop job -set-priority job_20151126032920_1160549 VERY_HIGH 调整优先级
bin/hadoop job -set-map-capacity job_20151126032920_1142443 1000

--------------------------------------：$ bin/hadoop job
Usage: JobClient

    [-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 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 specify comma separated files to be copied to the map reduce cluster
-libjars specify comma separated jar files to include in the classpath.
-archives specify comma separated archives to be unarchived on the compute machines.

The general command line syntax is
bin/hadoop command [genericOptions] [commandOptions]