[SPARK-4535][Streaming] Fix the error in comments

change `NetworkInputDStream` to `ReceiverInputDStream`
change `ReceiverInputTracker` to `ReceiverTracker`

Author: q00251598 <qiyadong@huawei.com>

Closes #3400 from watermen/fix-comments and squashes the following commits:

75d795c [q00251598] change 'NetworkInputDStream' to 'ReceiverInputDStream' && change 'ReceiverInputTracker' to 'ReceiverTracker'

2 files changed, 2 insertions, 2 deletions

diff --git a/examples/src/main/scala/org/apache/spark/examples/streaming/StatefulNetworkWordCount.scala b/examples/src/main/scala/org/apache/spark/examples/streaming/StatefulNetworkWordCount.scala
index 514252b89e..ed186ea565 100644
--- a/examples/src/main/scala/org/apache/spark/examples/streaming/StatefulNetworkWordCount.scala
+++ b/examples/src/main/scala/org/apache/spark/examples/streaming/StatefulNetworkWordCount.scala
@@ -64,7 +64,7 @@ object StatefulNetworkWordCount {
     // Initial RDD input to updateStateByKey
     val initialRDD = ssc.sparkContext.parallelize(List(("hello", 1), ("world", 1)))
 
-    // Create a NetworkInputDStream on target ip:port and count the
+    // Create a ReceiverInputDStream on target ip:port and count the
     // words in input stream of \n delimited test (eg. generated by 'nc')
     val lines = ssc.socketTextStream(args(0), args(1).toInt)
     val words = lines.flatMap(_.split(" "))
diff --git a/examples/src/main/scala/org/apache/spark/examples/streaming/clickstream/PageViewStream.scala b/examples/src/main/scala/org/apache/spark/examples/streaming/clickstream/PageViewStream.scala
index d9b886eff7..55226c0a6d 100644
--- a/examples/src/main/scala/org/apache/spark/examples/streaming/clickstream/PageViewStream.scala
+++ b/examples/src/main/scala/org/apache/spark/examples/streaming/clickstream/PageViewStream.scala
@@ -50,7 +50,7 @@ object PageViewStream {
     val ssc = new StreamingContext("local[2]", "PageViewStream", Seconds(1),
       System.getenv("SPARK_HOME"), StreamingContext.jarOfClass(this.getClass).toSeq)
 
-    // Create a NetworkInputDStream on target host:port and convert each line to a PageView
+    // Create a ReceiverInputDStream on target host:port and convert each line to a PageView
     val pageViews = ssc.socketTextStream(host, port)
                        .flatMap(_.split("\n"))
                        .map(PageView.fromString(_))