[GitHub] spark issue #16905: [SPARK-19567][CORE][SCHEDULER] Support some Schedulable ...

[markhamstra <gi...@git.apache.org>]

Github user markhamstra commented on the issue:

    https://github.com/apache/spark/pull/16905
  
    @srowen These refactorings of unnecessary vars to vals is something that we've noted in the discussions of a few other PRs as something that could and probably should be done in a separate PR (i.e. this one).
    
    @erenavsarogullari There is another such refactoring that can be rolled into this PR.  See the changes that I've made to `rootPool` in `TaskSchedulerImpl`, `DAGSchedulerSuite` and `ExternalClusterManagerSuite` here: https://github.com/markhamstra/spark/commit/e11fe2a9817559492daee03c8c025879dc44d346


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