xbaran commented on a change in pull request #526: HIVE-21218: KafkaSerDe
doesn't support topics created via Confluent
URL: https://github.com/apache/hive/pull/526#discussion_r254983249
##########
File path: kafka-handler/README.md
##########
@@ -25,6 +25,10 @@ If you want to switch serializer/deserializer classes you
can use alter table.
```sql
ALTER TABLE kafka_table SET TBLPROPERTIES
("kafka.serde.class"="org.apache.hadoop.hive.serde2.avro.AvroSerDe");
```
+
+If you use Confluent Avro serialzier/deserializer with schema registry you may
want to remove 4 bytes from beginning that represents schema ID from registry.
+It can be done with settings `"avro.serde.magic.bytes"="true"`. It's
recommended to set
`"avro.schema.url"="http://schemaregistry/SimpleDocument.avsc"`
Review comment:
Yea, this is true the schema could be from s3 or other source. I put that
`schemaregistry` hostname as a placeholder which is misleading.
I like that idea with `avro.serde.type="confluent"`
That `avro.schema.literal` is from 2014 and from what I read from code it
has higher priority than `avro.schema.url`. Well, there is never enough
documentation tho :)
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