Till Rohrmann created FLINK-9573:

             Summary: Check for leadership with leader session id
                 Key: FLINK-9573
                 URL: https://issues.apache.org/jira/browse/FLINK-9573
             Project: Flink
          Issue Type: Improvement
          Components: Distributed Coordination
    Affects Versions: 1.5.0, 1.6.0
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann

In order to check whether a {{LeaderContender}} is still the leader, it is not 
sufficient to simply provide a {{LeaderElectionService#hasLeadership()}}. 
Instead, we should extend this method to also take the leader session id as a 
parameter to distinguish between different calls from the same leader contender 
with different leader session ids.

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