Github user choang commented on a diff in the pull request:
https://github.com/apache/storm/pull/705#discussion_r41186043
--- Diff: external/storm-kafka/src/jvm/storm/kafka/StateStore.java ---
@@ -0,0 +1,43 @@
+package storm.kafka;
+
+import java.util.Map;
+
+/**
+ * Abstraction of a partition state storage.
+ *
+ * The partition state usually is kept in Json format in the store and in
Map format in runtime memory. An example
+ * is shown below:
+ *
+ * Json:
+ * {
+ * "broker": {
+ * "host": "kafka.sample.net",
+ * "port": 9092
+ * },
+ * "offset": 4285,
+ * "partition": 1,
+ * "topic": "testTopic",
+ * "topology": {
+ * "id": "fce905ff-25e0 -409e-bc3a-d855f 787d13b",
+ * "name": "Test Topology"
+ * }
+ * }
+ *
+ * Memory:
+ * Map<Object, Object> data = (Map<Object, Object>) ImmutableMap.builder()
+ * .put("topology", ImmutableMap.of(
+ * "id", "fce905ff-25e0 -409e-bc3a-d855f 787d13b",
+ * "name", "Test Topology"))
+ * .put("offset", 4285)
+ * .put("partition", 1)
+ * .put("broker", ImmutableMap.of(
+ * "host", "kafka.sample.net",
+ * "port", 9092))
+ * .put("topic", "testTopic").build();
+ */
+public interface StateStore {
--- End diff --
extends <tt>Closeable</tt>
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