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From Suraj Menon <surajsme...@apache.org>
Subject Re: Question about the workflow of GroomServer
Date Thu, 21 Nov 2013 11:03:52 GMT
You have figured it out correct. Please elaborate on which object is
getting instantiated twice?


On Wed, Nov 20, 2013 at 11:05 AM, Yexi Jiang <yexijiang@gmail.com> wrote:

> Hi,
> I am recently reading the code of the GroomServer and trying to figure out
> the workflow. The following is my understanding, please correct me if I am
> wrong.
> I already know the following steps:
> 1. When initializing, the GroomServer will create an instructor, who will
> buffer the incoming directive instance (a wrapper of action that can
> launch, recover, or kill a task?).
> 2. The instance will be handled by the DispatchTasksHandler.
> 3. If the action is launched, then a couple of things will be done in the
> order: DispatchTasksHandler.startNewTask -> GroomServer.localizeJob ->
> GroomServer.launchTaskForJob -> TaskInProgress.launchTask .
> I haven't figure out why a couple of distinct BSPJob instances are created
> in these steps.
> 4. A TaskRunner will be created to run the task. Further, a BSPChildRunner
> instance will be created. When the BSPChildRunner instance (a thread) been
> scheduled and executed, it will create a process to execute
> the BSPPeerChild.
> 5. BSPChildRunner will create a BSPPeerImpl and it will be executed by a
> BSPTask (BSPTask.run -> BSPTask.runBSP).
> 6. BSPPeerImpl will execute its setup, bsp, and cleanup method, which will
> be implemented by the end user.
> Regards,
> Yexi

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