Github user mridulm commented on the issue:
https://github.com/apache/spark/pull/22433
It is an implementation detail of k8s integration that application name is
expected to be DNS compliant ... spark does not have that requirement; and
yarn/mesos/standalone/local work without this restriction.
The right fix in k8s integration would be to sanitize the name specified by
user/application to be compliant with its requirements. This will help not just
with thrift server, but any spark application.
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