GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/19477
[SPARK-22258][SQL] Writing empty dataset fails with ORC format
## What changes were proposed in this pull request?
Since [SPARK-8501](https://issues.apache.org/jira/browse/SPARK-8501), Spark
doesn't create an ORC file for empty data sets. However,
[SPARK-21669](https://issues.apache.org/jira/browse/SPARK-21669) is trying to
get the length of the written file at the end of writing tasks and fails with
`FileNotFoundException`. This is a regression at 2.3.0 only. We had better fix
this and have a test case to prevent future regression.
```scala
scala> Seq("str").toDS.limit(0).write.format("orc").save("/tmp/a")
17/10/11 19:28:59 ERROR Utils: Aborting task
java.io.FileNotFoundException: File
file:/tmp/a/_temporary/0/_temporary/attempt_20171011192859_0000_m_000000_0/part-00000-aa56c3cf-ec35-48f1-bb73-23ad1480e917-c000.snappy.orc
does not exist
at
org.apache.hadoop.fs.RawLocalFileSystem.deprecatedGetFileStatus(RawLocalFileSystem.java:611)
at
org.apache.hadoop.fs.RawLocalFileSystem.getFileLinkStatusInternal(RawLocalFileSystem.java:824)
at
org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:601)
at
org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:421)
at
org.apache.spark.sql.execution.datasources.BasicWriteTaskStatsTracker.getFileSize(BasicWriteStatsTracker.scala:60)
```
## How was this patch tested?
Pass the newly added test cases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-22258
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19477.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 #19477
----
commit b545f281b19120cc2c9e4197cae4b1315969247d
Author: Dongjoon Hyun <[email protected]>
Date: 2017-10-12T02:38:51Z
[SPARK-22258][SQL] Writing empty dataset fails with ORC format
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