dpvelasquez opened a new pull request #976: YARN-2695. Added support for reservation continue looking with node labels URL: https://github.com/apache/hadoop/pull/976 When a resource deprived node is scheduled by resource manager, capacity scheduler will reserve a container on this node even though there are resources available on other nodes. Since reserved containers take up headroom, sometimes resources available on other nodes will never be utilized. After this change, headroom calculation will include resources that could be unreserved on other nodes in the same partition, and unreserve the container after allocation of another container on the scheduled node.
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