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Nathan Roberts commented on YARN-3298: -------------------------------------- [~leftnoteasy], won't that be extremely close to what it is today? If so, then does it really solve the jitter issue you originally cited? Just to make sure I'm in-sync with your proposed direction, this is the code you're thinking about modifying, correct? {code} // Note: We aren't considering the current request since there is a fixed // overhead of the AM, but it's a > check, not a >= check, so... if (Resources .greaterThan(resourceCalculator, clusterResource, user.getConsumedResourceByLabel(label), limit)) { {code} > User-limit should be enforced in CapacityScheduler > -------------------------------------------------- > > Key: YARN-3298 > URL: https://issues.apache.org/jira/browse/YARN-3298 > Project: Hadoop YARN > Issue Type: Bug > Components: capacityscheduler, yarn > Reporter: Wangda Tan > Assignee: Wangda Tan > > User-limit is not treat as a hard-limit for now, it will not consider > required-resource (resource of being-allocated resource request). And also, > when user's used resource equals to user-limit, it will still continue. This > will generate jitter issues when we have YARN-2069 (preemption policy kills a > container under an user, and scheduler allocate a container under the same > user soon after). > The expected behavior should be as same as queue's capacity: > Only when user.usage + required <= user-limit (1), queue will continue to > allocate container. > (1), user-limit mentioned here is determined by following computing > {code} > current-capacity = queue.used + now-required (when queue.used > > queue.capacity) > queue.capacity (when queue.used < queue.capacity) > user-limit = min(max(current-capacity / #active-users, current-capacity * > user-limit / 100), queue-capacity * user-limit-factor) > {code} -- This message was sent by Atlassian JIRA (v6.3.4#6332)