Merge pull request GoogleCloudPlatform#504 from rangadi/kafka_release_notes

Increase KafkaIO version to 0.2.0

Author: dhalperi

contrib/kafka/README.md

@@ -0,0 +1,39 @@
+# KafkaIO : Dataflow Unbounded Source and Sink for Kafka Topics
+
+KafkaIO provides unbounded source and sink for [Kafka](http://kafka.apache.org/)
+topics. Kafka versions 0.9 and above are supported.
+
+## Basic Usage
+
+* Read from a topic with 8 byte long keys and string values:
+```java
+ PCollection<KV<Long, String>> kafkaRecords =
+   pipeline
+     .apply(KafkaIO.read()
+       .withBootstrapServers("broker_1:9092,broker_2:9092")
+       .withTopics(ImmutableList.of("topic_a"))
+       .withKeyCoder(BigEndianLongCoder.of())
+       .withValueCoder(StringUtf8Coder.of())
+       .withoutMetadata()
+     );
+```
+
+* Write the same PCollection to a Kafka topic:
+```java
+ kafkaRecords.apply(KafkaIO.write()
+   .withBootstrapServers("broker_1:9092,broker_2:9092")
+   .withTopic("results")
+   .withKeyCoder(BigEndianLongCoder.of())
+   .withValueCoder(StringUtf8Coder.of())
+ );
+```
+
+Please see JavaDoc for KafkaIO in
+[KafkaIO.java](https://github.com/GoogleCloudPlatform/DataflowJavaSDK/blob/master/contrib/kafka/src/main/java/com/google/cloud/dataflow/contrib/kafka/KafkaIO.java#L100)
+for complete documentation and a more descriptive usage example.
+
+## Release Notes
+  * **0.2.0** : Assign one split for each of the Kafka topic partitions. This makes Dataflow
+                [Update](https://cloud.google.com/dataflow/pipelines/updating-a-pipeline)
+                from previous version incompatible.
+  * **0.1.0** : KafkaIO with support for Unbounded Source and Sink.

contrib/kafka/pom.xml

@@ -25,7 +25,7 @@
     <artifactId>google-cloud-dataflow-java-contrib-kafka</artifactId>
     <name>Google Cloud Dataflow Kafka IO Library</name>
     <description>Library to read Kafka topics.</description>
-    <version>0.1.0-SNAPSHOT</version>
+    <version>0.2.0-SNAPSHOT</version>
 
     <properties>
       <dataflow.version>[1.6.0, 1.99)</dataflow.version>