Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2905
I fear that we cannot merge the PR as it is, because it would leave the
`CuratorFramework` client open for some of the components used in the master.
For example, the `WebMonitor` uses the same code path to open a leader
retrieval service in case of HA mode.
In order to solve this problem, I think we have to change the master to
also use the `HighAvailabilityServices`. Then we have a single point of
responsibility to close the `CuratorFramework` client.
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