Sandy Ryza created YARN-335:
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Summary: Fair scheduler doesn't check whether rack needs
containers before assigning to node
Key: YARN-335
URL: https://issues.apache.org/jira/browse/YARN-335
Project: Hadoop YARN
Issue Type: Bug
Affects Versions: 2.0.2-alpha
Reporter: Sandy Ryza
Assignee: Sandy Ryza
If an application has an outstanding request on a node, the fair scheduler may
try to place a container on that node without checking whether that node's rack
needs any containers. If the rack doesn't need any containers, none should be
scheduled on the node.
This can cause an NPE in the fair scheduler.
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