dafu created HELIX-123:
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Summary: ZkHelixManager.isLeader() should check session id in addition to instance
name
Key: HELIX-123
URL: https://issues.apache.org/jira/browse/HELIX-123
Project: Apache Helix
Issue Type: Bug
Reporter: dafu
Assignee: dafu
Current ZkHelixManager.isLeader() is not checking session id. This is problematic. In case
of session expiry, we might have multiple Helix manager instances with the same instance name
but different session id's. And since they have the same instance name, if we have a manager
leaking, multiple controllers will take the controller-ship and send multiple state transition
messages.
In distributed-mode, the CONTROLLER_PARTICIPANT will create the leader node and create a CONTROLLER
manager instance. In this case, the leader node contains the session id of the CONTROLLER_PARTICIPANT
not the CONTROLLER, so when checking against the leader session id, we need to take care of
this case as well.
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