Nathan Roberts created YARN-4963: ------------------------------------ Summary: capacity scheduler: Make number of OFF_SWITCH assignments per heartbeat configurable Key: YARN-4963 URL: https://issues.apache.org/jira/browse/YARN-4963 Project: Hadoop YARN Issue Type: Improvement Components: capacityscheduler Affects Versions: 2.7.2, 3.0.0 Reporter: Nathan Roberts Assignee: Nathan Roberts
Currently the capacity scheduler will allow exactly 1 OFF_SWITCH assignment per heartbeat. With more and more non MapReduce workloads coming along, the degree of locality is declining, causing scheduling to be significantly slower. It's still important to limit the number of OFF_SWITCH assignments to avoid densely packing OFF_SWITCH containers onto nodes. Proposal is to add a simple config that makes the number of OFF_SWITCH assignments configurable. Will upload candidate patch shortly. -- This message was sent by Atlassian JIRA (v6.3.4#6332)