[FLINK-6134] Set UUID(0L, 0L) as default leader session id

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.3.0
• Fix Version/s: 1.3.0
• Component/s: Runtime / Coordination
• Assignee: Till Rohrmann
• Reporter: Till Rohrmann
• Created: 20/Mar/17 17:19
• Updated: 22/Mar/17 11:15
• Resolved: 22/Mar/17 11:14

Description

The leader election/retrieval services use the null value as the default leader id in the standalone case but also as no active leader in the ZooKeeper case. This is ambiguous and therefore I propose to change the default leader id to UUID(0L, 0L). Consequently, a null leader id value can then indicate that there is no active leader available.

Issue Links

• links to: GitHub Pull Request #3578