Hi Any node would submit the job to JobTracker which distributes the jar to TaskTrackers and individual tasks are executed on nodes across the cluster.
MR tasks are executed across the cluster. Regards Bejoy KS Sent from remote device, Please excuse typos -----Original Message----- From: KayVajj <vajjalak...@gmail.com> Date: Wed, 13 Mar 2013 09:01:42 To: <user@hadoop.apache.org> Reply-To: user@hadoop.apache.org Subject: Question regarding hadoop jar command usage I have a question regarding the hadoop jar command. In a cluster of say nodes n1,n2...n100 the node n1 has jar Myjar on its local file system. If I run the command hadoop jar local/path/to/Myjar Myclass other-args Is the MR job executed just on n1 or any arbitrary node n1..n100? If it is any arbitrary node, since Myjar exists only on n1. Is the jar copied across all nodes on the cluster to run the MR code.
