[jira] [Created] (AURORA-1820) Reduce storage write lock contention by adopting Double-Checked Locking pattern in TimedOutTaskHandler

["Mehrdad Nurolahzade (JIRA)" <ji...@apache.org>]

Mehrdad Nurolahzade created AURORA-1820:
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             Summary: Reduce storage write lock contention by adopting Double-Checked Locking pattern in TimedOutTaskHandler
                 Key: AURORA-1820
                 URL: https://issues.apache.org/jira/browse/AURORA-1820
             Project: Aurora
          Issue Type: Task
          Components: Efficiency, Scheduler
            Reporter: Mehrdad Nurolahzade
            Assignee: Mehrdad Nurolahzade
            Priority: Critical


{{TimedOutTaskHandler}} acquires storage write lock for every task every time they transition to a transient state. It then verifies after a default time-out period of 5 minutes if the task has transitioned out of the transient state. 

The verification step takes place while holding the storage write lock. In over 99% of cases the logic short-circuits and returns from {{StateManagerImpl.updateTaskAndExternalState()}} once it learns task has transitioned out of the transient state.

Reduce storage write lock contention by adopting [Double-Checked Locking|https://en.wikipedia.org/wiki/Double-checked_locking] pattern in {{TimedOutTaskHandler.run()}}.



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