KAFKA-506 Hadoop consumer not advancing to next offset. No review.

git-svn-id: https://svn.apache.org/repos/asf/incubator/kafka/branches/0.8@1397388 13f79535-47bb-0310-9956-ffa450edef68

contrib/hadoop-consumer/src/main/java/kafka/etl/KafkaETLContext.java

@@ -205,7 +205,7 @@ public class KafkaETLContext {
             
             key.set(_index, _offset, messageAndOffset.message().checksum());
             
-            _offset = messageAndOffset.offset();  //increase offset
+            _offset = messageAndOffset.nextOffset();  //increase offset
             _count ++;  //increase count
             
             return true;