Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18396
For warnings becoming errors, I described this in
https://issues.apache.org/jira/browse/SPARK-20840 with my tests and
observations. Given my investigation, the root cause is, Javadoc8 produces both
warnings and errors into standard error and SBT gets confused of which one is
warning. One possible approach (which was done in SBT I believe) is to manually
parse the log output (in a similar way I proposed in the JIRA) but it looks
gets a limitation. There are more information in the JIRA I investigated for a
couple of weeks.
For mismatching docs, I don't know the exact reason. My wild guess was it
got confused by nested ones so I just tried to put `afterAll` to where I guess
GenJavaDoc gets less confused.
For not throwing errors for missing documentations in `StreamTest`, I guess
because we disabled the doclint for miing documentation -
https://github.com/apache/spark/blob/master/project/SparkBuild.scala#L233. For
unknown reason, it appears the documentation went mixed with some functions
that have no documentation and this threw errors for parameter mismatching that
we check up to my knowledge.
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