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From GitBox <...@apache.org>
Subject [GitHub] dawidwys closed pull request #6078: [FLINK-9438] Add documentation for AvroDeserializationSchema
Date Wed, 08 Aug 2018 07:24:48 GMT
dawidwys closed pull request #6078: [FLINK-9438] Add documentation for AvroDeserializationSchema
URL: https://github.com/apache/flink/pull/6078

This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:

As this is a foreign pull request (from a fork), the diff is supplied
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diff --git a/docs/dev/connectors/kafka.md b/docs/dev/connectors/kafka.md
index 47a6651a5de..b9dbd8fe07f 100644
--- a/docs/dev/connectors/kafka.md
+++ b/docs/dev/connectors/kafka.md
@@ -166,6 +166,39 @@ For convenience, Flink provides the following schemas:
     The KeyValue objectNode contains a "key" and "value" field which contain all fields,
as well as
     an optional "metadata" field that exposes the offset/partition/topic for this message.
+3. `AvroDeserializationSchema` which reads data serialized with Avro format using a statically
provided schema. It can
+    infer the schema from Avro generated classes (`AvroDeserializationSchema.forSpecific(...)`)
or it can work with `GenericRecords`
+    with a manually provided schema (with `AvroDeserializationSchema.forGeneric(...)`). This
deserialization schema expects that
+    the serialized records DO NOT contain embedded schema.
+    - There is also a version of this schema available that can lookup the writer's schema
(schema which was used to write the record) in
+      [Confluent Schema Registry](https://docs.confluent.io/current/schema-registry/docs/index.html).
Using these deserialization schema
+      record will be read with the schema that was retrieved from Schema Registry and transformed
to a statically provided( either through 
+      `ConfluentRegistryAvroDeserializationSchema.forGeneric(...)` or `ConfluentRegistryAvroDeserializationSchema.forSpecific(...)`).
+    <br>To use this deserialization schema one has to add the following additional
+<div class="codetabs" markdown="1">
+<div data-lang="AvroDeserializationSchema" markdown="1">
+{% highlight xml %}
+  <groupId>org.apache.flink</groupId>
+  <artifactId>flink-avro</artifactId>
+  <version>{{site.version }}</version>
+{% endhighlight %}
+<div data-lang="ConfluentRegistryAvroDeserializationSchema" markdown="1">
+{% highlight xml %}
+  <groupId>org.apache.flink</groupId>
+  <artifactId>flink-avro-confluent-registry</artifactId>
+  <version>{{site.version }}</version>
+{% endhighlight %}
 When encountering a corrupted message that cannot be deserialized for any reason, there
 are two options - either throwing an exception from the `deserialize(...)` method
 which will cause the job to fail and be restarted, or returning `null` to allow


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