XuMingmin commented on a change in pull request #1127: [CALCITE-2913] Adapter
for Apache Kafka
URL: https://github.com/apache/calcite/pull/1127#discussion_r284358866
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File path: site/_docs/kafka_adapter.md
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@@ -0,0 +1,103 @@
+---
+layout: docs
+title: Kafka adapter
+permalink: /docs/kafka_adapter.html
+---
+<!--
+{% comment %}
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements. See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to you under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+{% endcomment %}
+-->
+
+**Note**:
+
+KafkaAdapter is an experimental feature, changes in public API and usage are
expected.
+
+For instructions on downloading and building Calcite, start with
the[tutorial]({{ site.baseurl }}/docs/tutorial.html).
+
+The Kafka adapter exposes an Apache Kafka topic as a STREAM table, so it can
be queried using
+[Calcite Stream SQL]({{ site.baseurl }}/docs/stream.html). Note that the
adapter will not attempt to scan all topics,
+instead users need to configure tables manually, one Kafka stream table is
mapping to one Kafka topic.
+
+A basic example of a model file is given below:
+
+{% highlight json %}
+{
+ "version": "1.0",
+ "defaultSchema": "KAFKA",
+ "schemas": [
+ {
+ "name": "KAFKA",
+ "tables": [
+ {
+ "name": "TABLE_NAME",
+ "type": "custom",
+ "factory": "org.apache.calcite.adapter.kafka.KafkaTableFactory",
+ "row.converter": "com.example.CustKafkaRowConverter",
+ "operand": {
+ "bootstrap.servers": "host1:port,host2:port",
+ "topic.name": "kafka.topic.name",
+ "consumer.params": {
+ "key.deserializer":
"org.apache.kafka.common.serialization.ByteArrayDeserializer",
+ "value.deserializer":
"org.apache.kafka.common.serialization.ByteArrayDeserializer"
+ }
+ }
+ }
+ ]
+ }
+ ]
+}
+{% endhighlight %}
+
+Note that:
+
+1. As Kafka message is schemaless, a [KafkaRowConverter]({{ site.apiRoot
}}/org/apache/calcite/adapter/kafka/KafkaRowConverter.html)
+ is required to specify row schema explicitly(with parameter `row.converter`),
and
+ how to decode Kafka message to Calcite row. [KafkaRowConverterImpl]({{
site.apiRoot }}/org/apache/calcite/adapter/kafka/KafkaRowConverterImpl.html)
+ is used if not provided;
+
+2. More consumer settings can be added in parameter `consumer.paras`;
Review comment:
yes, let me update it.
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