[YARN-2241] ZKRMStateStore: On startup, show nicer messages if znodes already exist

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.5.0
• Fix Version/s: 2.5.0
• Component/s: resourcemanager
• Target Version/s: 2.5.0
• Hadoop Flags: Reviewed
• Assignee: Robert Kanter
• Reporter: Robert Kanter
• Created: 01/Jul/14 23:02
• Updated: 15/Aug/14 05:44
• Resolved: 02/Jul/14 20:36

Description

When using the RMZKStateStore, if you restart the RM, you get a bunch of stack traces with messages like org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists for /rmstore. This is expected as these nodes already exist from before. We should catch these and print nicer messages.