GitHub user startjava added a comment to the discussion: how use exclusive 
implements leader election ??i want know more details??

about :
One example of concrete use case for this feature is in the Pulsar Functions 
metadata controller. In order to write a single linear history of all the 
functions metadata updates, it requires to elect 1 leader and that all the 
"decisions" made by this leader be written on the topic.

GitHub link: 
https://github.com/apache/pulsar/discussions/17703#discussioncomment-3667253

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