This is documentation for MapR Version 5.0. You can also refer to MapR documentation for the latest release.

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The hadoop job command enables you to manage MapReduce jobs.

Syntax

hadoop job [Generic Options]
        [-submit <job-file>]
	[-status <job-id>]
	[-counter <job-id> <group-name> <counter-name>]
	[-kill <job-id>]
	[-unblacklist <job-id> <hostname>]
	[-unblacklist-tracker <hostname>]
	[-set-priority <job-id> <priority>]
	[-events <job-id> <from-event-#> <#-of-events>]
	[-history <jobOutputDir>]
	[-list [all]]
	[-list-active-trackers]
	[-list-blacklisted-trackers]
	[-list-attempt-ids <job-id> <task-type> <task-state>]
	[-kill-task <task-id>]
	[-fail-task <task-id>]
        [-blacklist-tasktracker <hostname>]
        [-showlabels]

Parameters

Command Options

The following command options are supported for hadoop job:

Parameter

Description

-submit <job-file>

Submits the job.

-status <job-id>

Prints the map and reduce completion percentage and all job counters.

-counter <job-id> <group-name> <counter-name>

Prints the counter value.

-kill <job-id>

Kills the job.

-unblacklist <job-id> <hostname>

Removes a tasktracker job from the jobtracker's blacklist.

-unblacklist-tracker <hostname>

Admin only. Removes the TaskTracker at <hostname> from the JobTracker's global blacklist.

-set-priority <job-id> <priority>

Changes the priority of the job. Valid priority values are VERY_HIGH, HIGH, NORMAL, LOW, and VERY_LOW.
The job scheduler uses this property to determine the order in which jobs are run.

-events <job-id> <from-event-#> <#-of-events>

Prints the events' details received by jobtracker for the given range.

-history <jobOutputDir>

Prints job details, failed and killed tip details.

-list [all]

The -list all option displays all jobs. The -list command without the all option displays only jobs which are yet to complete.

-list-active-trackers

Prints all active tasktrackers.

-list-blackisted-trackers

Prints the TaskTracker nodes that JobTracker blacklisted with the reason for blacklisting. 

-list-attempt-ids <job-id><task-type>

Lists the IDs of task attempts.

-kill-task <task-id>

Kills the task. Killed tasks are not counted against failed attempts.

-fail-task <task-id>

Fails the task. Failed tasks are counted against failed attempts.

-blacklist-tasktracker <hostname>

Pauses all current tasktracker jobs and prevent additional jobs from being scheduled on the tasktracker.

-showlabels

Dumps label information of all active nodes.

Generic Options

The following generic options are supported for the hadoop job command: -conf <configuration file>-D <property=value>-fs <local|file system URI>-jt <local|jobtracker:port>-files <file1,file2,file3,...>-libjars <libjar1,libjar2,libjar3,...>, and -archives <archive1,archive2,archive3,...>. For more information on generic options, see Generic Options.

Examples

Submitting Jobs

The hadoop job -submit command enables you to submit a job to the specified jobtracker.

Stopping Jobs Gracefully

Use the hadoop kill command to stop a running or queued job.

Viewing Job History Logs

Run the hadoop job -history command to view the history logs summary in specified directory.

This command will print job details, failed and killed tip details.

Additional details about the job such as successful tasks and task attempts made for each task can be viewed by adding the -all option:

Blacklisting Tasktrackers

The hadoop job command when run as root or using sudo can be used to manually blacklist tasktrackers:

Manually blacklisting a tasktracker pauses any running jobs and prevents additional jobs from being scheduled.
For a detailed discussion see TaskTracker Blacklisting.

 

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