[jira] [Created] (FLINK-6174) Introduce a leader election service in yarn mode to make JobManager always available

[Shang Yuanchun (Jira)]

Tao Wang created FLINK-6174:
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             Summary: Introduce a leader election service in yarn mode to make JobManager always available
                 Key: FLINK-6174
                 URL: https://issues.apache.org/jira/browse/FLINK-6174
             Project: Flink
          Issue Type: Improvement
          Components: JobManager
            Reporter: Tao Wang
            Assignee: Tao Wang


Now in yarn mode, if we use zookeeper as high availability choice, it will create a election service to get a leader depending on zookeeper election.

When zookeeper leader crashes or the connection between JobManager and zookeeper instance was broken, JobManager's leadership will be revoked and send a Disconnect message to TaskManager, which will cancle all running tasks and make them waiting connection rebuild between JM and ZK.

In yarn mode, we have one and only JobManager(AM) in same time, and it should be alwasy leader instead of elected through zookeeper. We can introduce a new leader election service in yarn mode to achive that.



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