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Jason Lowe commented on YARN-3091: ---------------------------------- bq. I'm looking at reverting the read/write lock changes within the fair scheduler at least. Thoughts? +1, we've also seen a number of problems around the scheduler's read/write locks and have done some short-term fixes to work around them like YARN-6680. They are significantly more expensive to acquire than a standard mutex if nobody is holding the lock, and there are lots of places where the scheduler needs to acquire them during a scheduling pass. > [Umbrella] Improve and fix locks of RM scheduler > ------------------------------------------------ > > Key: YARN-3091 > URL: https://issues.apache.org/jira/browse/YARN-3091 > Project: Hadoop YARN > Issue Type: Task > Components: capacityscheduler, fairscheduler, resourcemanager, > scheduler > Reporter: Wangda Tan > > In existing YARN RM scheduler, there're some issues of using locks. For > example: > - Many unnecessary synchronized locks, we have seen several cases recently > that too frequent access of scheduler makes scheduler hang. Which could be > addressed by using read/write lock. Components include scheduler, CS queues, > apps > - Some fields not properly locked (Like clusterResource) > We can address them together in this ticket. > (More details see comments below) -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: yarn-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: yarn-issues-h...@hadoop.apache.org