abbccdda commented on a change in pull request #9012: URL: https://github.com/apache/kafka/pull/9012#discussion_r457015552
########## File path: core/src/main/scala/kafka/server/BrokerToControllerChannelManager.scala ########## @@ -0,0 +1,211 @@ +/* + * 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. + */ + +package kafka.server + +import java.util.concurrent.{BlockingQueue, LinkedBlockingQueue, TimeUnit} + +import kafka.common.{InterBrokerSendThread, RequestAndCompletionHandler} +import kafka.network.RequestChannel +import kafka.utils.Logging +import org.apache.kafka.clients._ +import org.apache.kafka.common.requests.AbstractRequest +import org.apache.kafka.common.utils.{LogContext, Time} +import org.apache.kafka.common.Node +import org.apache.kafka.common.metrics.Metrics +import org.apache.kafka.common.network._ +import org.apache.kafka.common.protocol.Errors +import org.apache.kafka.common.requests.AbstractRequest.NoOpRequestBuilder +import org.apache.kafka.common.security.JaasContext + +import scala.collection.mutable +import scala.jdk.CollectionConverters._ + +/** + * This class manages the connection between a broker and the controller. It runs a single + * {@link BrokerToControllerRequestThread} which uses the broker's metadata cache as its own metadata to find + * and connect to the controller. The channel is async and runs the network connection in the background. + * The maximum number of in-flight requests are set to one to ensure orderly response from the controller, therefore + * care must be taken to not block on outstanding requests for too long. + */ +class BrokerToControllerChannelManager(metadataCache: kafka.server.MetadataCache, + time: Time, + metrics: Metrics, + config: KafkaConfig, + threadNamePrefix: Option[String] = None) extends Logging { + private val requestQueue = new LinkedBlockingQueue[BrokerToControllerQueueItem] + private val logContext = new LogContext(s"[broker-${config.brokerId}-to-controller] ") + private val manualMetadataUpdater = new ManualMetadataUpdater() + private val requestThread = newRequestThread + + def start(): Unit = { + requestThread.start() + } + + def shutdown(): Unit = { + requestThread.shutdown() + requestThread.awaitShutdown() + } + + private[server] def newRequestThread = { + val brokerToControllerListenerName = config.controlPlaneListenerName.getOrElse(config.interBrokerListenerName) + val brokerToControllerSecurityProtocol = config.controlPlaneSecurityProtocol.getOrElse(config.interBrokerSecurityProtocol) + + val networkClient = { + val channelBuilder = ChannelBuilders.clientChannelBuilder( + brokerToControllerSecurityProtocol, + JaasContext.Type.SERVER, + config, + brokerToControllerListenerName, + config.saslMechanismInterBrokerProtocol, + time, + config.saslInterBrokerHandshakeRequestEnable, + logContext + ) + val selector = new Selector( + NetworkReceive.UNLIMITED, + Selector.NO_IDLE_TIMEOUT_MS, + metrics, + time, + "BrokerToControllerChannel", + Map("BrokerId" -> config.brokerId.toString).asJava, + false, + channelBuilder, + logContext + ) + new NetworkClient( + selector, + manualMetadataUpdater, + config.brokerId.toString, + 1, + 0, + 0, + Selectable.USE_DEFAULT_BUFFER_SIZE, + Selectable.USE_DEFAULT_BUFFER_SIZE, + config.requestTimeoutMs, + config.connectionSetupTimeoutMs, + config.connectionSetupTimeoutMaxMs, + ClientDnsLookup.DEFAULT, Review comment: Actually I'm not fully aware of a proper value for this field, how do we actually determine it? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
