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Eric Payne commented on YARN-4390: ---------------------------------- The failing unit tests {{TestAMAuthorization, TestCapacityScheduler, TestCapacitySchedulerSurgicalPreemption, TestClientRMTokens}} usually pass for me. I am concerned about {{TestCapacitySchedulerSurgicalPreemption}} because this doesn't always pass and is affected by race conditions that prevent containers from being allocated fast enough or preempted before the assertion checks are made. > Do surgical preemption based on reserved container in CapacityScheduler > ----------------------------------------------------------------------- > > Key: YARN-4390 > URL: https://issues.apache.org/jira/browse/YARN-4390 > Project: Hadoop YARN > Issue Type: Sub-task > Components: capacity scheduler > Affects Versions: 2.8.0, 2.7.3, 3.0.0-alpha1 > Reporter: Eric Payne > Assignee: Wangda Tan > Fix For: 2.9.0, 3.0.0-alpha1 > > Attachments: QueueNotHittingMax.jpg, YARN-4390-design.1.pdf, > YARN-4390-test-results.pdf, YARN-4390.1.patch, YARN-4390.2.patch, > YARN-4390.3.branch-2.patch, YARN-4390.3.patch, YARN-4390.4.patch, > YARN-4390.5.patch, YARN-4390.6.patch, YARN-4390.7.patch, YARN-4390.8.patch, > YARN-4390.branch-2.8.001.patch > > > There are multiple reasons why preemption could unnecessarily preempt > containers. One is that an app could be requesting a large container (say > 8-GB), and the preemption monitor could conceivably preempt multiple > containers (say 8, 1-GB containers) in order to fill the large container > request. These smaller containers would then be rejected by the requesting AM > and potentially given right back to the preempted app. -- 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