mumrah commented on a change in pull request #9100: URL: https://github.com/apache/kafka/pull/9100#discussion_r474959176
########## File path: core/src/main/scala/kafka/server/AlterIsrChannelManager.scala ########## @@ -0,0 +1,132 @@ +package kafka.server + +import java.util +import java.util.concurrent.{ScheduledFuture, TimeUnit} +import java.util.concurrent.atomic.AtomicLong + +import kafka.api.LeaderAndIsr +import kafka.metrics.KafkaMetricsGroup +import kafka.utils.{Logging, Scheduler} +import kafka.zk.KafkaZkClient +import org.apache.kafka.clients.ClientResponse +import org.apache.kafka.common.TopicPartition +import org.apache.kafka.common.message.AlterIsrRequestData.{AlterIsrRequestPartitions, AlterIsrRequestTopics} +import org.apache.kafka.common.message.{AlterIsrRequestData, AlterIsrResponseData} +import org.apache.kafka.common.protocol.Errors +import org.apache.kafka.common.requests.{AlterIsrRequest, AlterIsrResponse} + +import scala.collection.mutable +import scala.jdk.CollectionConverters._ + +/** + * Handles the sending of AlterIsr requests to the controller. Updating the ISR is an asynchronous operation, + * so partitions will learn about updates through LeaderAndIsr messages sent from the controller + */ +trait AlterIsrChannelManager { + val IsrChangePropagationBlackOut = 5000L + val IsrChangePropagationInterval = 60000L + + def enqueueIsrUpdate(alterIsrItem: AlterIsrItem): Unit + + def clearPending(topicPartition: TopicPartition): Unit + + def startup(): Unit + + def shutdown(): Unit +} + +case class AlterIsrItem(topicPartition: TopicPartition, leaderAndIsr: LeaderAndIsr) + +class AlterIsrChannelManagerImpl(val controllerChannelManager: BrokerToControllerChannelManager, + val zkClient: KafkaZkClient, + val scheduler: Scheduler, + val brokerId: Int, + val brokerEpoch: Long) extends AlterIsrChannelManager with Logging with KafkaMetricsGroup { + + private val pendingIsrUpdates: mutable.Map[TopicPartition, AlterIsrItem] = new mutable.HashMap[TopicPartition, AlterIsrItem]() + private val lastIsrChangeMs = new AtomicLong(0) + private val lastIsrPropagationMs = new AtomicLong(0) + + @volatile private var scheduledRequest: Option[ScheduledFuture[_]] = None + + override def enqueueIsrUpdate(alterIsrItem: AlterIsrItem): Unit = { + pendingIsrUpdates synchronized { + pendingIsrUpdates(alterIsrItem.topicPartition) = alterIsrItem + lastIsrChangeMs.set(System.currentTimeMillis()) + // Rather than sending right away, we'll delay at most 50ms to allow for batching of ISR changes happening + // in fast succession + if (scheduledRequest.isEmpty) { + scheduledRequest = Some(scheduler.schedule("propagate-alter-isr", propagateIsrChanges, 50, -1, TimeUnit.MILLISECONDS)) + } + } + } + + override def clearPending(topicPartition: TopicPartition): Unit = { + pendingIsrUpdates synchronized { + // when we get a new LeaderAndIsr, we clear out any pending requests + pendingIsrUpdates.remove(topicPartition) + } + } + + override def startup(): Unit = { + controllerChannelManager.start() + } + + override def shutdown(): Unit = { + controllerChannelManager.shutdown() + } + + private def propagateIsrChanges(): Unit = { + val now = System.currentTimeMillis() + pendingIsrUpdates synchronized { + if (pendingIsrUpdates.nonEmpty) { + // Max ISRs to send? + val message = new AlterIsrRequestData() + .setBrokerId(brokerId) + .setBrokerEpoch(brokerEpoch) + .setTopics(new util.ArrayList()) + + pendingIsrUpdates.values.groupBy(_.topicPartition.topic()).foreachEntry((topic, items) => { + val topicPart = new AlterIsrRequestTopics() + .setName(topic) + .setPartitions(new util.ArrayList()) + message.topics().add(topicPart) + items.foreach(item => { + topicPart.partitions().add(new AlterIsrRequestPartitions() + .setPartitionIndex(item.topicPartition.partition()) + .setLeaderId(item.leaderAndIsr.leader) + .setLeaderEpoch(item.leaderAndIsr.leaderEpoch) + .setNewIsr(item.leaderAndIsr.isr.map(Integer.valueOf).asJava) + .setCurrentIsrVersion(item.leaderAndIsr.zkVersion) + ) + }) + }) + + def responseHandler(response: ClientResponse): Unit = { Review comment: Continued in https://github.com/apache/kafka/pull/9100#discussion_r474934833 ---------------------------------------------------------------- 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