When you create the executor (in your Scheduler code) you specify the command line script to launch on the Slave. So if you are running a java executor on the slave, your script will launch a jvm with all the usually command line trimmings to run the Executor.main(). The mesos Slave process that invokes the script, I assume passes the executor ID and related setup data to the java executor shell script when it is started to properly setup the executor configs.
Thanks, Sam Taha http://www.grandlogic.com On Thu, Sep 26, 2013 at 3:26 PM, Vladimir Vivien <[email protected]>wrote: > Vinod > Thanks. Your reply added more knowledge to my understanding. > > From my one week understanding of mesos, it seems when a slave launches a > task, it does so via an OS call of "/bin/sh -c". Now, how does the slave > process reach into the running process to trigger the callbacks ? > > > On Thu, Sep 26, 2013 at 3:17 PM, Vinod Kone <[email protected]> wrote: > >> The way it works is as follows: >> >> Scheduler launches "tasks". A task has an "executor id" (optional) >> attached to it. When a slave gets a task, it launches an executor if an >> executor with that "executor id" is not running. All subsequent tasks >> tagged with the same "executor id" are just passed on to the running >> executor. >> >> Typically executors send TASK_STARTING or TASK_RUNNING updates when a >> task gets launched. This is the signal that could be used by the schedulers >> to know that a task (and its corresponding executor) has launched. >> >> HTH, >> >> >> On Thu, Sep 26, 2013 at 12:03 PM, Vladimir Vivien < >> [email protected]> wrote: >> >>> Hi. New to Mesos and still trying to wrap my head around its concept. >>> >>> Question: >>> When an executor is launched by Mesos, how does the Scheduler know about >>> the Executor it just launched and vise versa ? It appears that the slave >>> launches an OS process, but I am unclear how the coordination is done >>> between the running OS process and mesos. >>> -- >>> Vladimir Vivien >>> >> >> > > > -- > Vladimir Vivien >
