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https://issues.apache.org/jira/browse/MAPREDUCE-7274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17084662#comment-17084662
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Chengwei Wang edited comment on MAPREDUCE-7274 at 5/26/20, 7:08 AM:
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upload patch for branch 3.2.0.
It enable us to set limit for running tasks when job is running by mapred
client command:
{code:bash}
mapred job -set-running-task-limit JOB_ID TASK_TYPE LIMIT
e.g.
mapred job -set-running-task-limit job_1583809537551_21297 MAP 100
mapred job -set-running-task-limit job_1583809537551_21297 REDUCE 100
{code}
it send a rpc resquest to AM, and AM would update the max running limit of the
specified type task as specified limit count.
was (Author: smarthan):
upload patch for branch 3.2.0.
It enable us to set limit for running tasks when job is running by mapred
client command:
{code:bash}
mapred job -set-running-task-limit JOB_ID TASK_TYPE LIMIT
e.g.
mapred job -set-running-task-limit job_1583809537551_21297 MAP 100
mapred job -set-running-task-limit job_1583809537551_21297 REDUCE 100
{code}
it send a rpc resquest to AM, and AM would update the max running limit of the
specified type task as specified limit count.
> Enable to limit running map and reduce tasks when job is running
> ----------------------------------------------------------------
>
> Key: MAPREDUCE-7274
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7274
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Components: mr-am, mrv2
> Reporter: Chengwei Wang
> Priority: Major
> Attachments: MAPREDUCE-7274.patch
>
>
> MRv2 enabled users to control the number of map or reduce tasks running
> simultaneously by configuration *_mapreduce.job.running.map.limit_* or
> _*mapreduce.job.running.reduce.limit*._ But users can only set limit number
> before submitting the job to rm. So, it's meaningful to enable users to set
> the limit of running map or reduce tasks when job is running, which can help
> users to restrict resource usage of job and give resources to high-priority
> job.
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