Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/20616
The warning error messages in kerberized environments are the one in
PR/JIRA description.
For example, Apache Spark 2.2.1 binary on kerberized cluster shows the
following.
```
scala> spark.read.json("hdfs:///tmp/people.json").show
18/02/20 23:24:05 WARN FileStreamSink: Error while looking for metadata
directory.
18/02/20 23:24:05 WARN FileStreamSink: Error while looking for metadata
directory.
+----+-------+
| age| name|
+----+-------+
|null|Michael|
| 30| Andy|
| 19| Justin|
+----+-------+
scala> spark.version
res1: String = 2.2.1
```
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