[YARN-5911] DrainDispatcher does not drain all events on stop even if setDrainEventsOnStop is true

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.9.0, 3.0.0-alpha2
• Hadoop Flags: Reviewed
• Assignee: Varun Saxena
• Reporter: Varun Saxena
• Created: 18/Nov/16 06:17
• Updated: 23/Nov/16 08:40
• Resolved: 23/Nov/16 08:36

Description

DrainDispatcher#serviceStop sets the stopped flag first before draining the event queue.
This means that the thread terminates as soon as it encounters stopped flag as true and does not continue to process leftover events in queue, something which it should do if setDrainEventsOnStop is set.