kafka: Remove unused connection pool options

These options were deprecated 7 years ago[1] and have been unused since
then.

[1] 1ccdccddaa

Change-Id: I75f85cf25e4fc3cb027386d479f2da4765e5bb8b

oslo_messaging/_drivers/kafka_driver/kafka_options.py

@@ -18,71 +18,43 @@ from oslo_messaging._drivers import common
 KAFKA_OPTS = [
     cfg.IntOpt('kafka_max_fetch_bytes', default=1024 * 1024,
                help='Max fetch bytes of Kafka consumer'),
-
     cfg.FloatOpt('kafka_consumer_timeout', default=1.0,
                  help='Default timeout(s) for Kafka consumers'),
-
-    cfg.IntOpt('pool_size', default=10,
-               deprecated_for_removal=True,
-               deprecated_reason='Driver no longer uses connection pool. ',
-               help='Pool Size for Kafka Consumers'),
-
-    cfg.IntOpt('conn_pool_min_size', default=2,
-               deprecated_for_removal=True,
-               deprecated_reason='Driver no longer uses connection pool. ',
-               help='The pool size limit for connections expiration policy'),
-
-    cfg.IntOpt('conn_pool_ttl', default=1200,
-               deprecated_for_removal=True,
-               deprecated_reason='Driver no longer uses connection pool. ',
-               help='The time-to-live in sec of idle connections in the pool'),
-
     cfg.StrOpt('consumer_group', default="oslo_messaging_consumer",
                help='Group id for Kafka consumer. Consumers in one group '
                     'will coordinate message consumption'),
-
     cfg.FloatOpt('producer_batch_timeout', default=0.,
                  help="Upper bound on the delay for KafkaProducer batching "
                       "in seconds"),
-
     cfg.IntOpt('producer_batch_size', default=16384,
                help='Size of batch for the producer async send'),
-
     cfg.StrOpt('compression_codec', default='none',
                choices=['none', 'gzip', 'snappy', 'lz4', 'zstd'],
                help='The compression codec for all data generated by the '
                     'producer. If not set, compression will not be used. '
                     'Note that the allowed values of this depend on the kafka '
                     'version'),
-
     cfg.BoolOpt('enable_auto_commit',
                 default=False,
                 help='Enable asynchronous consumer commits'),
-
     cfg.IntOpt('max_poll_records', default=500,
                help='The maximum number of records returned in a poll call'),
-
     cfg.StrOpt('security_protocol', default='PLAINTEXT',
                choices=('PLAINTEXT', 'SASL_PLAINTEXT', 'SSL', 'SASL_SSL'),
                help='Protocol used to communicate with brokers'),
-
     cfg.StrOpt('sasl_mechanism',
                default='PLAIN',
                help='Mechanism when security protocol is SASL'),
-
     cfg.StrOpt('ssl_cafile',
                default='',
                help='CA certificate PEM file used to verify the server'
                ' certificate'),
-
     cfg.StrOpt('ssl_client_cert_file',
                default='',
                help='Client certificate PEM file used for authentication.'),
-
     cfg.StrOpt('ssl_client_key_file',
                default='',
                help='Client key PEM file used for authentication.'),
-
     cfg.StrOpt('ssl_client_key_password',
                default='',
                help='Client key password file used for authentication.')

releasenotes/notes/remove-kafka-conn-pool-opts-0b7962e2f22b24ed.yaml

@@ -0,0 +1,9 @@
+---
+upgrade:
+  - |
+    The following deprecated options in the ``[oslo_messaging_kafka]`` section
+    have been removed.
+
+    - ``pool_size``
+    - ``conn_pool_min_size``
+    - ``conn_pool_ttl``