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

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-6134:
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             Summary: Set UUID(0L, 0L) as default leader session id
                 Key: FLINK-6134
                 URL: https://issues.apache.org/jira/browse/FLINK-6134
             Project: Flink
          Issue Type: Improvement
          Components: Distributed Coordination
    Affects Versions: 1.3.0
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann
            Priority: Minor
             Fix For: 1.3.0


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.



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