spark git commit: [MINOR][SPARK SUBMIT] Print out R file usage in spark-submit

[sr...@apache.org]

Repository: spark
Updated Branches:
  refs/heads/master 8ca4ebefa -> 2b1e94b9a


[MINOR][SPARK SUBMIT] Print out R file usage in spark-submit

## What changes were proposed in this pull request?

Currently, running the shell below:

```bash
$ ./bin/spark-submit tmp.R a b c
```

with R file, `tmp.R` as below:

```r
#!/usr/bin/env Rscript

library(SparkR)
sparkRSQL.init(sparkR.init(master = "local"))
collect(createDataFrame(list(list(1))))
print(commandArgs(trailingOnly = TRUE))
```

working fine as below:

```bash
  _1
1  1
[1] "a" "b" "c"
```

However, it looks not printed in usage documentation as below:

```bash
$ ./bin/spark-submit
```

```
Usage: spark-submit [options] <app jar | python file> [app arguments]
...
```

For `./bin/sparkR`, it looks fine as below:

```bash
$ ./bin/sparkR tmp.R
```

```
Running R applications through 'sparkR' is not supported as of Spark 2.0.
Use ./bin/spark-submit <R file>
```

Running the script below:

```bash
$ ./bin/spark-submit
```

**Before**

```
Usage: spark-submit [options] <app jar | python file> [app arguments]
...
```

**After**

```
Usage: spark-submit [options] <app jar | python file | R file> [app arguments]
...
```

## How was this patch tested?

Manually tested.

Author: hyukjinkwon <gu...@gmail.com>

Closes #18505 from HyukjinKwon/minor-doc-summit.


Project: http://git-wip-us.apache.org/repos/asf/spark/repo
Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/2b1e94b9
Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/2b1e94b9
Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/2b1e94b9

Branch: refs/heads/master
Commit: 2b1e94b9add82b30bc94f639fa97492624bf0dce
Parents: 8ca4ebe
Author: hyukjinkwon <gu...@gmail.com>
Authored: Tue Jul 4 12:18:42 2017 +0100
Committer: Sean Owen <so...@cloudera.com>
Committed: Tue Jul 4 12:18:42 2017 +0100

----------------------------------------------------------------------
 .../main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/spark/blob/2b1e94b9/core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala
----------------------------------------------------------------------
diff --git a/core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala b/core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala
index 3d9a14c..7800d3d 100644
--- a/core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala
+++ b/core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala
@@ -504,7 +504,7 @@ private[deploy] class SparkSubmitArguments(args: Seq[String], env: Map[String, S
       outStream.println("Unknown/unsupported param " + unknownParam)
     }
     val command = sys.env.get("_SPARK_CMD_USAGE").getOrElse(
-      """Usage: spark-submit [options] <app jar | python file> [app arguments]
+      """Usage: spark-submit [options] <app jar | python file | R file> [app arguments]
         |Usage: spark-submit --kill [submission ID] --master [spark://...]
         |Usage: spark-submit --status [submission ID] --master [spark://...]
         |Usage: spark-submit run-example [options] example-class [example args]""".stripMargin)


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