Adding method to return subtask map #117
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Goal: Find a way to access individual subtask metrics. Specifically, find a way to access individual subtask queue times.
While metrics currently has functionality to allow for time in queue information to be extracted from the general job, it does not have the functionality capable of extracting time in queue information from individual subtasks. We found that we desire to implement a feature within metrics that would retrieve the subtask times of our pipeline jobs, as the current metrics don't allow for accurate queue time tracking when you have parallelized tasks.
We accomplished this by returning a map that specifically maps each subtask in chronological order it entered the queue to the time it that each task spent waiting in queue.
Our modifications included one function in TimeInQueueAction.java: getSubTaskQueuingDurations()
getSubTaskQueuingDurations() makes a hash map that takes the subtask's relative order and maps it to the subtask queue time. Each subtask is given a number based on the order of when each one first entering the queue.