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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Work logged] (HIVE-21218) KafkaSerDe doesn't support topics created via Confluent Avro serializer
Date Fri, 08 Feb 2019 08:16:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-21218?focusedWorklogId=196116&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-196116
]

ASF GitHub Bot logged work on HIVE-21218:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 08/Feb/19 08:15
            Start Date: 08/Feb/19 08:15
    Worklog Time Spent: 10m 
      Work Description: xbaran commented on pull request #526: HIVE-21218: KafkaSerDe doesn't
support topics created via Confluent
URL: https://github.com/apache/hive/pull/526#discussion_r254983960
 
 

 ##########
 File path: kafka-handler/src/test/org/apache/hadoop/hive/kafka/AvroBytesConverterTest.java
 ##########
 @@ -0,0 +1,70 @@
+package org.apache.hadoop.hive.kafka;
+
+import com.google.common.collect.Maps;
+import io.confluent.kafka.schemaregistry.client.MockSchemaRegistryClient;
+import io.confluent.kafka.serializers.KafkaAvroSerializer;
+import org.apache.avro.Schema;
+import org.apache.hadoop.hive.serde2.avro.AvroGenericRecordWritable;
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.util.Map;
+
+/**
+ * Created by Milan Baran on 1/29/19 15:03.
+ */
+public class AvroBytesConverterTest {
+
+    private static SimpleRecord simpleRecord1 = SimpleRecord.newBuilder().setId("123").setName("test").build();
+    private static byte[] simpleRecord1AsBytes;
+
+    /**
+     * Emulate confluent avro producer that add 4 magic bits (int) before value bytes. The
int represents the schema ID from schema registry.
+     */
+    @BeforeClass
+    public static void setUp() {
+        Map<String,String> config = Maps.newHashMap();
+        config.put("schema.registry.url","http://localhost");
+        KafkaAvroSerializer avroSerializer = new KafkaAvroSerializer(new MockSchemaRegistryClient());
+        avroSerializer.configure(config, false);
 
 Review comment:
   Yea, good idea. Right now as @b-slim said keys are treated as bytes. But it this case we
need to add a lot of configuration into actual kafka table properties. 
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 196116)
    Time Spent: 40m  (was: 0.5h)

> KafkaSerDe doesn't support topics created via Confluent Avro serializer
> -----------------------------------------------------------------------
>
>                 Key: HIVE-21218
>                 URL: https://issues.apache.org/jira/browse/HIVE-21218
>             Project: Hive
>          Issue Type: Bug
>          Components: kafka integration, Serializers/Deserializers
>    Affects Versions: 3.1.1
>            Reporter: Milan Baran
>            Assignee: Milan Baran
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> According to [Google groups|https://groups.google.com/forum/#!topic/confluent-platform/JYhlXN0u9_A] the
Confluent avro serialzier uses propertiary format for kafka value - <magic_byte 0x00><4
bytes of schema ID><regular avro bytes for object that conforms to schema>. 
> This format does not cause any problem for Confluent kafka deserializer which respect
the format however for hive kafka handler its bit a problem to correctly deserialize kafka
value, because Hive uses custom deserializer from bytes to objects and ignores kafka consumer
ser/deser classes provided via table property.
> It would be nice to support Confluent format with magic byte.
> Also it would be great to support Schema registry as well.



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