SPARK-2427: Fix Scala examples that use the wrong command line arguments index

The Scala examples HBaseTest and HdfsTest don't use the correct indexes for the command line arguments. This due to to the fix of JIRA 1565, where these examples were not correctly adapted to the new usage of the submit script.

Author: Artjom-Metro <Artjom-Metro@users.noreply.github.com>
Author: Artjom-Metro <artjom31415@googlemail.com>

Closes #1353 from Artjom-Metro/fix_examples and squashes the following commits:

6111801 [Artjom-Metro] Reduce the default number of iterations
cfaa73c [Artjom-Metro] Fix some examples that use the wrong index to access the command line arguments

3 files changed, 16 insertions, 6 deletions

diff --git a/examples/src/main/scala/org/apache/spark/examples/HBaseTest.scala b/examples/src/main/scala/org/apache/spark/examples/HBaseTest.scala
index 4893b017ed..822673347b 100644
--- a/examples/src/main/scala/org/apache/spark/examples/HBaseTest.scala
+++ b/examples/src/main/scala/org/apache/spark/examples/HBaseTest.scala
@@ -31,12 +31,12 @@ object HBaseTest {
     val conf = HBaseConfiguration.create()
     // Other options for configuring scan behavior are available. More information available at
     // http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/mapreduce/TableInputFormat.html
-    conf.set(TableInputFormat.INPUT_TABLE, args(1))
+    conf.set(TableInputFormat.INPUT_TABLE, args(0))
 
     // Initialize hBase table if necessary
     val admin = new HBaseAdmin(conf)
-    if(!admin.isTableAvailable(args(1))) {
-      val tableDesc = new HTableDescriptor(args(1))
+    if (!admin.isTableAvailable(args(0))) {
+      val tableDesc = new HTableDescriptor(args(0))
       admin.createTable(tableDesc)
     }
 
diff --git a/examples/src/main/scala/org/apache/spark/examples/HdfsTest.scala b/examples/src/main/scala/org/apache/spark/examples/HdfsTest.scala
index 331de3ad1e..ed2b38e2ca 100644
--- a/examples/src/main/scala/org/apache/spark/examples/HdfsTest.scala
+++ b/examples/src/main/scala/org/apache/spark/examples/HdfsTest.scala
@@ -19,16 +19,22 @@ package org.apache.spark.examples
 
 import org.apache.spark._
 
+
 object HdfsTest {
+
+  /** Usage: HdfsTest [file] */
   def main(args: Array[String]) {
+    if (args.length < 1) {
+      System.err.println("Usage: HdfsTest <file>")
+      System.exit(1)
+    }
     val sparkConf = new SparkConf().setAppName("HdfsTest")
     val sc = new SparkContext(sparkConf)
-    val file = sc.textFile(args(1))
+    val file = sc.textFile(args(0))
     val mapped = file.map(s => s.length).cache()
     for (iter <- 1 to 10) {
       val start = System.currentTimeMillis()
       for (x <- mapped) { x + 2 }
-      //  println("Processing: " + x)
       val end = System.currentTimeMillis()
       println("Iteration " + iter + " took " + (end-start) + " ms")
     }
diff --git a/examples/src/main/scala/org/apache/spark/examples/SparkPageRank.scala b/examples/src/main/scala/org/apache/spark/examples/SparkPageRank.scala
index 40b36c779a..4c7e006da0 100644
--- a/examples/src/main/scala/org/apache/spark/examples/SparkPageRank.scala
+++ b/examples/src/main/scala/org/apache/spark/examples/SparkPageRank.scala
@@ -31,8 +31,12 @@ import org.apache.spark.{SparkConf, SparkContext}
  */
 object SparkPageRank {
   def main(args: Array[String]) {
+    if (args.length < 1) {
+      System.err.println("Usage: SparkPageRank <file> <iter>")
+      System.exit(1)
+    }
     val sparkConf = new SparkConf().setAppName("PageRank")
-    var iters = args(1).toInt
+    val iters = if (args.length > 0) args(1).toInt else 10
     val ctx = new SparkContext(sparkConf)
     val lines = ctx.textFile(args(0), 1)
     val links = lines.map{ s =>