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

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Abandoned
• Component/s: Runtime / Coordination
• Labels: pull-request-available
• Assignee: Tao Wang
• Reporter: Tao Wang
• Created: 23/Mar/17 03:01
• Updated: 27/Sep/19 10:07
• Resolved: 27/Sep/19 10:07

Description

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.

Issue Links

• links to: GitHub Pull Request #3599
• links to: GitHub Pull Request #3599