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What is the difference between hadoop job -kill job_id and yarn application -kill application_id? Whether the job_id and application_id represent/refer to same task?
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YARN is a generic job scheduling framework and HDFS is a storage framework. YARN in a nut shell has a master(Resource Manager) and workers(Node manager), The resource manager creates containers on workers to execute MapReduce jobs, spark jobs etc.
The ApplicationMaster is, in effect, an instance of a framework-specific library and is responsible for negotiating resources from the ResourceManager and working with the NodeManager(s) to execute and monitor the containers and their resource consumption.
Spark on YARN Typically, Spark would be run with HDFS for storage, and with either YARN (Yet Another Resource Manager) or Mesos, two of the most common resource managers. Unlike Mesos which is an OS-level scheduler, YARN is an application-level scheduler.
Yarn node manager: In a cluster, it monitors and launches the compute containers on machines. Yarn resource manager: Handles the allocation of computing resources coordination on the cluster. MapReduce application master Facilitates the tasks running the MapReduce work.
hadoop job -kill job_id and yarn application -kill application_id both command is used to kill a job running on Hadoop.
If you are using MapReduce Version1(MR V1) and you want to kill a job running on Hadoop, then you can use hadoop job -kill job_id to kill a job and it will kill all jobs( both running and queued).
In MapReduce Version2(MR V2 or YARN) when you submit a MapReduce job, It process through a application master and hence the job called application.There could be multiple task running within a application. If you want to kill a application then you can use yarn application -kill application_id command to kill the application. It will kill all running and queued jobs under the application.
If you want to kill a task in YARN then you can use hadoop job -kill-task <task-id> to kill a particular task in YARN
This link will be useful to understand application and job in YARN.
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Application_id is the ID associated with Application master. Both IDs are one and the same(will have same ID value) except for the prefixes application_ and job_ before the ID.
Both represent the same job only!!
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