abossert commented on a change in pull request #8112: removed hard-coded Kafka
key and value deserializer
URL: https://github.com/apache/incubator-druid/pull/8112#discussion_r305561008
##########
File path:
extensions-core/kafka-indexing-service/src/main/java/org/apache/druid/indexing/kafka/KafkaRecordSupplier.java
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@@ -207,7 +210,40 @@ public static void addConsumerPropertiesFromConfig(
ClassLoader currCtxCl = Thread.currentThread().getContextClassLoader();
try {
Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
- return new KafkaConsumer<>(props, new ByteArrayDeserializer(), new
ByteArrayDeserializer());
+ Deserializer keyDeserializerObject;
+ Deserializer valueDeserializerObject;
+
+ try {
+ Class keyDeserializerClass =
Class.forName(props.getProperty("key.deserializer",
"org.apache.kafka.common.serialization.ByteArrayDeserializer"));
+ Method keyDeserializerMethod =
keyDeserializerClass.getMethod("deserialize", String.class, byte[].class);
+ Type keyDeserializerReturnType =
keyDeserializerMethod.getGenericReturnType();
+
+ if (keyDeserializerReturnType.getTypeName().equals("byte[]")) {
+ keyDeserializerObject = (Deserializer)
keyDeserializerClass.getConstructor().newInstance();
+ } else {
+ throw new IllegalArgumentException("Key deserializer must return a
byte array (byte[]), " + keyDeserializerClass.getName() + " returns " +
keyDeserializerReturnType.getTypeName());
+ }
+ }
+ catch (ClassNotFoundException | NoSuchMethodException |
InstantiationException | IllegalAccessException | InvocationTargetException e) {
+ throw new StreamException(e);
+ }
+
+ try {
+ Class valueDeserializerClass =
Class.forName(props.getProperty("value.deserializer",
"org.apache.kafka.common.serialization.ByteArrayDeserializer"));
Review comment:
I ended up with an error doing it this way, so I did this instead:
ByteArrayDeserializer.class.getTypeName()
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