Minor fixes.

external/flume/src/main/scala/org/apache/spark/streaming/flume/FlumePollingInputDStream.scala

@@ -76,7 +76,7 @@ private[streaming] class FlumePollingReceiver(
   lazy val receiverExecutor = Executors.newFixedThreadPool(parallelism,
     new ThreadFactoryBuilder().setDaemon(true).setNameFormat("Flume Receiver Thread - %d").build())
 
-  private val connections = new LinkedBlockingQueue[FlumeConnection]()
+  private lazy val connections = new LinkedBlockingQueue[FlumeConnection]()
 
   override def onStart(): Unit = {
     // Create the connections to each Flume agent.
@@ -102,11 +102,11 @@ private[streaming] class FlumePollingReceiver(
                 logDebug(
                   "Received batch of " + events.size() + " events with sequence number: " + seq)
                 try {
-                  // Convert each Flume event to a serializable SparkPollingEvent
+                  // Convert each Flume event to a serializable SparkFlumeEvent
                   val buffer = new ArrayBuffer[SparkFlumeEvent](events.size())
                   var j = 0
                   while (j < events.size()) {
-                    buffer += sparkSinkEventToSparkFlumeEvent(events(j))
+                    buffer += toSparkFlumeEvent(events(j))
                     j += 1
                   }
                   store(buffer)
@@ -156,9 +156,9 @@ private[streaming] class FlumePollingReceiver(
   /**
    * Utility method to convert [[SparkSinkEvent]] to [[SparkFlumeEvent]]
    * @param event - Event to convert to SparkFlumeEvent
-   * @return - The SparkSinkEvent generated from Spar
+   * @return - The SparkFlumeEvent generated from SparkSinkEvent
    */
-  private def sparkSinkEventToSparkFlumeEvent(event: SparkSinkEvent): SparkFlumeEvent = {
+  private def toSparkFlumeEvent(event: SparkSinkEvent): SparkFlumeEvent = {
     val sparkFlumeEvent = new SparkFlumeEvent()
     sparkFlumeEvent.event.setBody(event.getBody)
     sparkFlumeEvent.event.setHeaders(event.getHeaders)