Namenode and jobtracker also startup an http server which is jetty. The http
interface is used to look at namenode health, status of datanodes, to browse
the file system, or in case of job tracker to view job status, task tracker
status etc.
JT and TT also use the same RPC mechanism to talk to
Hi Momina,
Thanks for replying. I wanted to know that JT and TT
interact with each other through this RPC Server and Client model, What
about the http Server Jetty what is it used for ??
Secondly, i would like to ask a related question, how does JT and TT
communicates with n
all communication regarding health of task tracker and tasks assigned to TT
from JT, info on failed tasks, completed all is communicated through
heartbeat ... what other communication are you talking about? hadoop uses
the regular heartbeat and all other info piggy backs on it ... from TT to JT
on
Hi Momina,
Is that all that RPC Server and Client is used for ???
What about the rest of the communication that happens between Jobtracker and
Tasktracker?? how the rest of the communication is done??
Ahmad
hi
the periodic heartbeat call that task trackers make to the jobtracker is
thru RPC same for namenode and data nodes.
momina
On Fri, Aug 13, 2010 at 5:39 AM, Ahmad Shahzad wrote:
> Hi ALL,
>Can anyone tell me the purpose for RPC server and RPC client
> that is used in hadoop.
Hi ALL,
Can anyone tell me the purpose for RPC server and RPC client
that is used in hadoop. As far as logs tell, they are used by JobTracker and
TaskTracker, as well as namenode and datanode. Can anyone tell me that for
what purpose RPC server and client are used by each of them.
Ahma
