[jira] [Commented] (SAMZA-680) Invert the JobCoordinator and AM logic

["Gustavo Anatoly (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SAMZA-680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14561448#comment-14561448 ] 

Gustavo Anatoly commented on SAMZA-680:
---------------------------------------

Hi, [~naveenatceg]

I was taking a look on the implementation and how to proceed it. But I have some doubts:

1. JobCoordinator would extend AMRMClientAsync.CallbackHandler?
2. If, yes in the previous question. How to proceed with classes related to samza-yarn, once
we have that import YarnAppMasterListener to pass it to implemented methods required by AMRMClientAsync.CallbackHandler?

Thanks.

> Invert the JobCoordinator and AM logic
> --------------------------------------
>
>                 Key: SAMZA-680
>                 URL: https://issues.apache.org/jira/browse/SAMZA-680
>             Project: Samza
>          Issue Type: Improvement
>            Reporter: Naveen Somasundaram
>
> Currently, the YARN AM pretty much dictates how the JobCoordinator works. This creates lot of inflexibility on how we can control failures or even integrate with new system (Mesos). 
> For e.g., https://issues.apache.org/jira/browse/SAMZA-465?focusedCommentId=14522043&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14522043
> It would nice to invert the logic to JobCoordinator, and JobCoordinator has a global view of container failures, config changes etc. This simplifies lot of implementation specifics (for e.g., dynamic scaling becomes easier). 
> A another nice to have, would be make this logic pluggable. 
> {noformat}
> e.g., 
> jobcoordinator.core=com.linkedin.YarnJobCoordinator
> or
> jobcoordinator.core=com.linkedin.MesosJobCoordinator
> or 
> jobcoordinator.core=com.linkedin.SomeCustomJobCoordinator
> {noformat}
> It would be nice for users who operate it as a service, to inject their own logic (e.g., Users extending, say, YanJobCoordinator to their own custom class and do some special logging/actions before container failure)



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