Github user EronWright commented on the issue:
https://github.com/apache/flink/pull/3600
To recap, when the ZK server is configured to use SASL, the client is
challenged accordingly. The client checks for a login entry in the JAAS config
to obtain a kerberos credential, and issues a warning if one isn't found. SASL
may be explicitly disabled on the client using the system property
`zookeeper.sasl.clientconfig`.
Flink provides a configuration setting with which to disable SASL on the
client, which causes the system property to be set. _I cannot think of why
the default value would be 'true'._ The behavior of 1.2.0 is that the default
is 'false' (because it effectively wasn't implemented). Maybe the default
should remain 'false'?
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