Github user gemmellr commented on a diff in the pull request:
https://github.com/apache/activemq-artemis/pull/1607#discussion_r146821818
--- Diff: docs/user-manual/en/kafka-bridges.md ---
@@ -0,0 +1,180 @@
+# Apache ActiveMQ Kafka Bridge
+
+The function of a bridge is to consume messages from a source queue in
Apache ActiveMQ Artemis,
+and forward them to a target topic, on a remote Apache Kafka server.
+
+By pairing Apache ActiveMQ Artemis and Apache Kafka with the bridge you
could have a hybrid broker setup,
+having a data flow with CORE, AMQP, MQTT clients, as well as now Kafka
clients also.
+Taking and giving the best features of both broker technologies when and
where needed for a flow of data.
+
+
+
+The intent is this will be a two way bridge, but currently the flow is a
single direction
+from Apache ActiveMQ Artemis to Apache Kafka
+
+
+The source and target servers are remote making bridging suitable
+for reliably sending messages from one artemis cluster to kafka,
+for instance across a WAN, to the cloud, or internet and where the
connection may be unreliable.
+
+The bridge has built in resilience to failure so if the target server
+connection is lost, e.g. due to network failure, the bridge will retry
+connecting to the target until it comes back online. When it comes back
+online it will resume operation as normal.
+
+
+
+In summary, Apache ActiveMQ Kafka Bridge is a way to reliably connect
separate
+Apache ActiveMQ Artemis server and Apache Kafka server together.
+
+## Configuring Kakfa Bridges
+
+Bridges are configured in `broker.xml`.
+Let's kick off
+with an example (this is actually from the kafka bridge test example):
+
+
+ <connector-services>
+ <connector-service name="my-kafka-bridge">
+
<factory-class>org.apache.activemq.artemis.integration.kafka.bridge.KafkaProducerBridgeFactory</factory-class>
+ <param key="bootstrap.servers"
value="kafka-1.domain.local:9092,kafka-2.domain.local:9092,kafka-3.domain.local:9092"
/>
+ <param key="queue-name" value="my.artemis.queue" />
+ <param key="kafka-topic" value="my_kafka_topic" />
+ </connector-service>
+ </connector-services>
+
+In the above example we have shown the required parameters to
+configure for a kakfa bridge. See below for a complete list of available
configuration options.
+
+### Serialization
+By default the CoreMessageSerializer is used.
+
+#### CoreMessageSerializer
+Default but can be explicitly set using
+
+ <param key="value.serializer"
value="org.apache.activemq.artemis.integration.kafka.protocol.core.CoreMessageSerializer"
/>
+
+This maps the Message properties to Record headers.
+And then maps the payload binary as the Record value, encoding TextMessage
+
+This makes it easy to consume from Kafka using default deserializers
+TextMessage using StringDeserializer and
+ByteMessage using BytesDeserializer.
+
+Also to note, if you serialized your objects using binary serialization
like Apache Avro, Apache Thrift etc. into a byte array for the ByteMessage,
+as that byte array is preserved in the record value part as is, you could
deserialize using an equivalent deserializer
+direct to back into Avro Record / Thrift Struct.
+
+Also supplied are some Apache Kafka deserializers allowing you to consume
from Apache Kafka
+and get a more familiar CoreMessage or JMSMessage, that your consumers can
use:
+
+`org.apache.activemq.artemis.integration.kafka.protocol.core.jms.CoreJmsMessageDeserializer`
+`org.apache.activemq.artemis.integration.kafka.protocol.core.CoreMessageDeserializer`
+
+You can get these Apache Kafka, Serializers/Deserializers via maven using
the following GAV coordinates:
+
+ <depedency>
+ <groupId>org.apache.activemq</groupId>
+ <artifactId>artemis-kafka-core-protocol</artifactId>
+ <version>2.4.0-SNAPSHOT</version>
+ </depedency>
+
+
+#### AMQPMessageSerializer
+Can be set by using:
+
+ <param key="value.serializer"
value="org.apache.activemq.artemis.integration.kafka.protocol.amqp.AMQPMessageSerializer"
/>
+
+
+This encodes the whole message into amqp binary protocol into the Record
value.
+
+This is useful if you have something like
+
+ https://github.com/EnMasseProject/amqp-kafka-bridge
+
+As it allows messages to pump into kafka in amqp binary, to then consumed
from kafka by clients using amqp binary protocol.
+
+Also provided are Apache Qpid Proton based Apache Kafka deserializers
allowing you to consume from
+Apache Kafka and get a ProtonMessage.
+
+`org.apache.activemq.artemis.integration.kafka.protocol.amqp.proton.ProtonMessageDeserializer`
+
+You can get these Apache Kafka, Serializers/Deserializers via maven using
the following GAV coordinates:
+
+ <depedency>
+ <groupId>org.apache.activemq</groupId>
+ <artifactId>artemis-kafka-amqp-protocol</artifactId>
+ <version>2.4.0-SNAPSHOT</version>
--- End diff --
As earlier version comment.
---
