Eren Avsarogullari created SPARK-19567:
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             Summary: Support some Schedulable variables immutability and access
                 Key: SPARK-19567
                 URL: https://issues.apache.org/jira/browse/SPARK-19567
             Project: Spark
          Issue Type: Improvement
          Components: Scheduler
    Affects Versions: 2.1.0
            Reporter: Eren Avsarogullari
            Priority: Minor


Support some Schedulable variables immutability and access

Some Schedulable variables need refactoring for immutability and access 
modifiers as follows:
- from vars to vals(if there is no requirement): This is important to support 
immutability as much as possible. 
Sample => Pool: weight, minShare, priority, name and taskSetSchedulingAlgorithm.
- access modifiers: Specially, vars access needs to be restricted from other 
parts of codebase to prevent potential side effects. Sample: 
Sample => TaskSetManager: tasksSuccessful, totalResultSize, calculatedTasks 
etc...



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