Handle some of the exceptions as unrecoverable errors

This is because msg_size_too_large and topic_authorization_failed error
codes should be treated as an unrecoverable error.
In Fluentd, we need to mark as unrecoverable with raise
Fluent::Unrecoverable. But current implementation does not handle them
as unrecoverable errors.

Signed-off-by: Hiroshi Hatake <hiroshi@chronosphere.io>

lib/fluent/plugin/out_rdkafka2.rb

@@ -126,6 +126,8 @@ class Fluent::Rdkafka2Output < Output
     config_param :max_enqueue_bytes_per_second, :size, :default => nil, :desc => 'The maximum number of enqueueing bytes per second'
 
     config_param :service_name, :string, :default => nil, :desc => 'Used for sasl.kerberos.service.name'
+    config_param :unrecoverable_error_types, :array, :default => [:topic_authorization_failed, :msg_size_too_large],
+                 :desc => 'Handle some of the errors should be unrecoverable if specified'
 
     config_section :buffer do
       config_set_default :chunk_keys, ["topic"]
@@ -522,7 +524,12 @@ def enqueue_with_retry(producer, topic, record_buf, message_key, partition, head
 
             raise e
           else
-            raise e
+            if unrecoverable_error_types.include?(e.code)
+              # some of the errors should be handled as an unrecoverable error
+              raise Fluent::UnrecoverableError, "Rejected due to #{e}"
+            else
+              raise e
+            end
           end
         end
       end