We are running flink 1.10 cluster, with 3 zookeepers for HA.
I noticed that trying to upgrade the zookeepers, even 1 by one, causes
jobmanagers to crash
```
java.net.UnknownHostException: foo-host: Name or service not known
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:929)
at
java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1324)
at java.net.InetAddress.getAllByName0(InetAddress.java:1277)
at java.net.InetAddress.getAllByName(InetAddress.java:1193)
at java.net.InetAddress.getAllByName(InetAddress.java:1127)
```
With some google fu, we noticed https://github.com/apache/flink/pull/11938.
Is there newer version of flink we can uptake where we can upgrade
zookeepers without job manager downtime?
And is there any other way around the fact, that having even a single
zookeeper down causes the jobmanagers to crash, thus eliminating the
usefulness of HA
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