[jira] [Created] (YARN-7301) Create stable Scheduler API

["Robert Kanter (JIRA)" <ji...@apache.org>]

Robert Kanter created YARN-7301:
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             Summary: Create stable Scheduler API
                 Key: YARN-7301
                 URL: https://issues.apache.org/jira/browse/YARN-7301
             Project: Hadoop YARN
          Issue Type: Bug
          Components: yarn
            Reporter: Robert Kanter


Currently, it's not practical for a user to create their own scheduler.  Besides it being a large undertaking, the API is a mess.  A few of the problems:
# We make incompatible changes to {{YarnScheduler}} sometimes (see YARN-7138).
# Many methods in {{YarnScheduler}} are marked as {{\@Public}} {{\@Stable}}, but the class itself has no annotations, which defaults to {{\@Private}}.
# We often cast a {{YarnScheduler}} to an {{AbstractYarnScheduler}}, which means that custom schedulers must also subclass {{AbstractYarnScheduler}} or they'll get a {{ClassCastException}}.  However, {{AbstractYarnScheduler}} is {{\@Private}} {{\@Unstable}}.

It could be useful to provide a proper usable API for custom schedulers.



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