GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/20616
[SPARK-23434][SQL] Spark should not warn `metadata directory` for a HDFS
file path
## What changes were proposed in this pull request?
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.
```scala
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.
```
After this PR,
```scala
scala> spark.read.json("hdfs:///tmp/people.json").show
+----+-------+
| age| name|
+----+-------+
|null|Michael|
| 30| Andy|
| 19| Justin|
+----+-------+
```
## How was this patch tested?
Manual.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-23434
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20616.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #20616
----
commit a14ff6974446b8e692b03c3e3f1cab52693cc6c4
Author: Dongjoon Hyun <dongjoon@...>
Date: 2018-02-15T05:13:24Z
[SPARK-23434][SQL] Spark should not warn `metadata directory` for a HDFS
file path
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