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Wangda Tan commented on YARN-2009: ---------------------------------- [~eepayne], Existing user-limit is computed by following logic: {code} user_limit = min { max{ current_capacity / #active_users, current_capacity * user_limit_percent}, queue_capacity * user_limit_factor} } {code} In my above example, the #active_users is 2 instead of 3 (because B has no more pending resource). The reason why it uses #active-user is: existing user-limit is used to balance *available resource to active users*, it doesn't consider the needs to re-balance (via preemption) usages of users. To make intra-queue user limit preemption can correctly balance usages between users, we need to fix the scheduling logic as well. > Priority support for preemption in ProportionalCapacityPreemptionPolicy > ----------------------------------------------------------------------- > > Key: YARN-2009 > URL: https://issues.apache.org/jira/browse/YARN-2009 > Project: Hadoop YARN > Issue Type: Sub-task > Components: capacityscheduler > Reporter: Devaraj K > Assignee: Sunil G > Attachments: YARN-2009.0001.patch, YARN-2009.0002.patch > > > While preempting containers based on the queue ideal assignment, we may need > to consider preempting the low priority application containers first. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: yarn-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: yarn-issues-h...@hadoop.apache.org