[ 
https://issues.apache.org/jira/browse/SPARK-23434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Dongjoon Hyun updated SPARK-23434:
----------------------------------
    Description: 
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}

{code}
scala> spark.version
res0: String = 2.0.2

scala> spark.read.json("hdfs:///tmp/people.json").show
18/02/15 05:25:24 WARN DataSource: Error while looking for metadata directory.
{code}

  was:
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}


> 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: 2.0.2, 2.1.2, 2.2.1, 2.3.0
>            Reporter: Dongjoon Hyun
>            Priority: Major
>
> 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}
> {code}
> scala> spark.version
> res0: String = 2.0.2
> scala> spark.read.json("hdfs:///tmp/people.json").show
> 18/02/15 05:25:24 WARN DataSource: Error while looking for metadata directory.
> {code}



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