FLUME-1729. Better Flume-Spark integration.

Use readFully instead of read in EventTransformer.

Author: harishreedharan

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

@@ -33,20 +33,20 @@ object EventTransformer extends Logging {
     Array[Byte]) = {
     val bodyLength = in.readInt()
     val bodyBuff = new Array[Byte](bodyLength)
-    in.read(bodyBuff)
+    in.readFully(bodyBuff)
 
     val numHeaders = in.readInt()
     val headers = new java.util.HashMap[CharSequence, CharSequence]
 
     for (i <- 0 until numHeaders) {
       val keyLength = in.readInt()
       val keyBuff = new Array[Byte](keyLength)
-      in.read(keyBuff)
+      in.readFully(keyBuff)
       val key: String = Utils.deserialize(keyBuff)
 
       val valLength = in.readInt()
       val valBuff = new Array[Byte](valLength)
-      in.read(valBuff)
+      in.readFully(valBuff)
       val value: String = Utils.deserialize(valBuff)
 
       headers.put(key, value)