[SLIDER-302] add scheduled executor to AM and event queue for async action dispatch

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Component/s: appmaster
• Sprint: Slider August #1, Slider August #2, Slider September #1
• Assignee: Steve Loughran
• Reporter: Steve Loughran
• Created: 08/Aug/14 11:03
• Updated: 11/Aug/14 10:07
• Resolved: 09/Aug/14 12:56

Description

some of the failure work: reset of sliding window, chaos events, imply scheduled actions. Some existing operations (AmSuicide) already use some threads for this

1. add a scheduled executor for pushing out this work
2. add any existing AM scheduled operations to the executor
3. add a simple event queue for the scheduled operations (and others) to push in actions for a pool of 1 or more handlers to process. This will stop an (already over-complex) sync model from getting worse
   Future: the action handler could review the queue and optimise work by postponing and consolidating size review operations until after any queued resizing actions (flex, release, lost-node, ...) have been processed