[jira] [Created] (HELIX-123) ZkHelixManager.isLeader() should check session id in addition to instance name

["dafu (JIRA)" <ji...@apache.org>]

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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