old_contents: # Licensed to the Apache Software Foundation (ASF) under one or more
  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # The ASF licenses this file to You under the Apache License, Version 2.0
  # (the "License"); you may not use this file except in compliance with
  # the License.  You may obtain a copy of the License at
  #
  #    http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from ducktape.mark import matrix
  from ducktape.mark.resource import cluster
  from ducktape.utils.util import wait_until
  
  from kafkatest.services.kafka import quorum
  from kafkatest.tests.verifiable_consumer_test import VerifiableConsumerTest
  
  class PluggableConsumerTest(VerifiableConsumerTest):
      """ Verify that the pluggable client framework works. """
  
      TOPIC = "test_topic"
      NUM_PARTITIONS = 1
  
      def __init__(self, test_context):
          super(PluggableConsumerTest, self).__init__(test_context, num_consumers=1, num_producers=0,
                                  num_zk=1, num_brokers=1, topics={
                                  self.TOPIC : { 'partitions': self.NUM_PARTITIONS, 'replication-factor': 1 },
          })
  
      @cluster(num_nodes=4)
      @matrix(metadata_quorum=quorum.all_non_upgrade)
      def test_start_stop(self, metadata_quorum=quorum.zk):
          """
          Test that a pluggable VerifiableConsumer module load works
          """
          consumer = self.setup_consumer(self.TOPIC)
  
          for num_started, node in enumerate(consumer.nodes, 1):
              consumer.start_node(node)
  
          self.logger.debug("Waiting for %d nodes to start" % len(consumer.nodes))
          wait_until(lambda: len(consumer.alive_nodes()) == len(consumer.nodes),
                     timeout_sec=60,
                     err_msg="Timed out waiting for consumers to start")
          self.logger.debug("Started: %s" % str(consumer.alive_nodes()))
          consumer.stop_all()
  
          self.logger.debug("Waiting for %d nodes to stop" % len(consumer.nodes))
          wait_until(lambda: len(consumer.dead_nodes()) == len(consumer.nodes),
                     timeout_sec=self.session_timeout_sec+5,
                     err_msg="Timed out waiting for consumers to shutdown")
  
new_contents: # Licensed to the Apache Software Foundation (ASF) under one or more
  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # The ASF licenses this file to You under the Apache License, Version 2.0
  # (the "License"); you may not use this file except in compliance with
  # the License.  You may obtain a copy of the License at
  #
  #    http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from ducktape.mark import matrix
  from ducktape.mark.resource import cluster
  from ducktape.utils.util import wait_until
  
  from kafkatest.services.kafka import quorum
  from kafkatest.tests.verifiable_consumer_test import VerifiableConsumerTest
  
  class PluggableConsumerTest(VerifiableConsumerTest):
      """ Verify that the pluggable client framework works. """
  
      TOPIC = "test_topic"
      NUM_PARTITIONS = 1
  
      def __init__(self, test_context):
          super(PluggableConsumerTest, self).__init__(test_context, num_consumers=1, num_producers=0,
                                  num_zk=1, num_brokers=1, topics={
                                  self.TOPIC : { 'partitions': self.NUM_PARTITIONS, 'replication-factor': 1 },
          })
  
      @cluster(num_nodes=4)
      @matrix(metadata_quorum=quorum.all_non_upgrade)
      def test_start_stop(self, metadata_quorum=quorum.zk):
          """
          Test that a pluggable VerifiableConsumer module load works
          """
          consumer = self.setup_consumer(self.TOPIC)
  
          for _, node in enumerate(consumer.nodes, 1):
              consumer.start_node(node)
  
          self.logger.debug("Waiting for %d nodes to start" % len(consumer.nodes))
          wait_until(lambda: len(consumer.alive_nodes()) == len(consumer.nodes),
                     timeout_sec=60,
                     err_msg="Timed out waiting for consumers to start")
          self.logger.debug("Started: %s" % str(consumer.alive_nodes()))
          consumer.stop_all()
  
          self.logger.debug("Waiting for %d nodes to stop" % len(consumer.nodes))
          wait_until(lambda: len(consumer.dead_nodes()) == len(consumer.nodes),
                     timeout_sec=self.session_timeout_sec+5,
                     err_msg="Timed out waiting for consumers to shutdown")
  
subject: Replace unused variable with underscore (#11037)