Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2550
@KurtYoung Yes, the `cluster-id` should lake the role of
`availability.zookeeper.path.namespace` - in some sense it is a renaming.
I would also suggest we use existing IDs where possible - for example the
Yarn application ID. That will make it easier for users who debug to correlate
the ZooKeeper entries with Flink jobs.
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