Jian He created YARN-2721:
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Summary: Race condition: ZKRMStateStore retry logic may throw
NodeExist exception
Key: YARN-2721
URL: https://issues.apache.org/jira/browse/YARN-2721
Project: Hadoop YARN
Issue Type: Bug
Reporter: Jian He
Assignee: Jian He
Fix For: 2.6.0
Blindly retrying operations in zookeeper will not work for non-idempotent
operations (like create znode). The reason is that the client can do a create
znode, but the response may not be returned because the server can die or
timeout. In case of retrying the create znode, it will throw a NODE_EXISTS
exception from the earlier create from the same session.
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