[YARN-6025] Fix synchronization issues of AbstractYarnScheduler#nodeUpdate and its implementations

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.9.0, 3.0.0-alpha2
• Component/s: capacity scheduler, scheduler
• Hadoop Flags: Reviewed
• Assignee: Naganarasimha G R
• Reporter: Naganarasimha G R
• Created: 23/Dec/16 00:24
• Updated: 04/Jan/17 00:16
• Resolved: 03/Jan/17 22:54

Description

YARN-3139 does optimization on the locks by introducing ReentrantReadWriteLock to remove synchronized locks, but still seems to have some synchronization locks in AbstractYarnScheduler and its hierarchy because of nonavailibility of read write locks in Fifo scheduler.