Dongjoon Hyun created SPARK-23434:
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Summary: Spark should not warn `metadata directory` for a HDFS
file path
Key: SPARK-23434
URL: https://issues.apache.org/jira/browse/SPARK-23434
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.2.1, 2.1.2, 2.3.0
Reporter: Dongjoon Hyun
When Spark reads a file path (e.g. `people.json`), it warns with a wrong error
message during looking up `people.json/_spark_metadata`. The root cause of this
istuation is the difference between `LocalFileSystem` and
`DistributedFileSystem`. `LocalFileSystem.exists()` returns `false`, but
`DistributedFileSystem.exists` raises Exception.
{code}
scala> spark.version
res0: String = 2.4.0-SNAPSHOT
scala>
spark.read.json("file:///usr/hdp/current/spark-client/examples/src/main/resources/people.json").show
+----+-------+
| age| name|
+----+-------+
|null|Michael|
| 30| Andy|
| 19| Justin|
+----+-------+
scala> spark.read.json("hdfs:///tmp/people.json")
18/02/15 05:00:48 WARN streaming.FileStreamSink: Error while looking for
metadata directory.
18/02/15 05:00:48 WARN streaming.FileStreamSink: Error while looking for
metadata directory.
res6: org.apache.spark.sql.DataFrame = [age: bigint, name: string]
{code}
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