[SPARK-19567] Support some Schedulable variables immutability and access

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.1.0
• Fix Version/s: 2.2.0
• Component/s: Scheduler, Spark Core
• Assignee: Eren Avsarogullari
• Reporter: Eren Avsarogullari
• Created: 12/Feb/17 20:24
• Updated: 17/May/20 17:48
• Resolved: 24/Mar/17 00:22

Description

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...

Issue Links

• links to: [Github] Pull Request #16905 (erenavsarogullari)