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From "Subru Krishnan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6355) Preprocessor framework for AM and Client interactions with the RM
Date Thu, 08 Jun 2017 20:40:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-6355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16043388#comment-16043388
] 

Subru Krishnan commented on YARN-6355:
--------------------------------------

Thanks [~asuresh] for working on this. I looked at the patch and have a few high-level comments:
  * Can you add a simple design doc with one diagram as the approach is non-trivial to grok
from only the patch. I had to have an offline discussions with you to understand the nuances.
  * I feel we should break up the jiras as there are multiple changes happening here:
     ** Refactoring of the {{ApplicationMasterService}} to allow for the filter/interceptor
extension. This should be the baseline (status-quo) without no regressions.
     ** Define the filter/interceptor extension. Consider using an private interface to simplify
the class hierarchy.
     ** Refactor the {{OpportunisticContainerAllocatorAMService}} to follow the above model.
  * The patch currently covers AM - RM protocol, we should reuse the work from YARN-5411 for
client - RM protocol.

> Preprocessor framework for AM and Client interactions with the RM
> -----------------------------------------------------------------
>
>                 Key: YARN-6355
>                 URL: https://issues.apache.org/jira/browse/YARN-6355
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Arun Suresh
>            Assignee: Arun Suresh
>              Labels: amrmproxy, resourcemanager
>         Attachments: YARN-6355.001.patch, YARN-6355.002.patch
>
>
> Currently on the NM, we have the {{AMRMProxy}} framework to intercept the AM <->
RM communication and enforce policies. This is used both by YARN federation (YARN-2915) as
well as Distributed Scheduling (YARN-2877).
> This JIRA proposes to introduce a similar framework on the the RM side, so that pluggable
policies can be enforced on ApplicationMasterService centrally as well.
> This would be similar in spirit to a Java Servlet Filter Chain. Where the order of the
interceptors can declared externally.
> Once possible usecase would be:
> the {{OpportunisticContainerAllocatorAMService}} is implemented as a wrapper over the
{{ApplicationMasterService}}. It would probably be better to implement it as an Interceptor.



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