[jira] [Created] (YARN-3986) getTransferredContainers in AbstractYarnScheduler should be present in YarnScheduler interface instead

["Varun Saxena (JIRA)" <ji...@apache.org>]

Varun Saxena created YARN-3986:
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             Summary: getTransferredContainers in AbstractYarnScheduler should be present in YarnScheduler interface instead
                 Key: YARN-3986
                 URL: https://issues.apache.org/jira/browse/YARN-3986
             Project: Hadoop YARN
          Issue Type: Bug
          Components: scheduler
    Affects Versions: 2.7.0
            Reporter: Varun Saxena
            Assignee: Varun Saxena


Currently getTransferredContainers is present in {{AbstractYarnScheduler}}.
But in ApplicationMasterService, while registering AM, we are calling this method by typecasting it to AbstractYarnScheduler, which is incorrect.

This method should be moved to YarnScheduler.

Because if a custom scheduler is to be added, it will implement YarnScheduler, not AbstractYarnScheduler.
As ApplicationMasterService is calling getTransferredContainers by typecasting it to AbstractYarnScheduler, it is imposing an indirect dependency on AbstractYarnScheduler for any pluggable custom scheduler.

We can move the method to YarnScheduler and leave the definition in AbstractYarnScheduler as it is.



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