rittikaadhikari commented on code in PR #12005: URL: https://github.com/apache/kafka/pull/12005#discussion_r878592964
########## core/src/main/scala/kafka/server/LeaderEndPoint.scala: ########## @@ -0,0 +1,108 @@ +/* + * 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 kafka.cluster.BrokerEndPoint +import kafka.server.AbstractFetcherThread.{ReplicaFetch, ResultWithPartitions} +import org.apache.kafka.common.TopicPartition +import org.apache.kafka.common.requests.FetchRequest +import org.apache.kafka.common.message.OffsetForLeaderEpochResponseData.EpochEndOffset +import org.apache.kafka.common.message.{FetchResponseData, OffsetForLeaderEpochRequestData} + +import scala.collection.Map + +/** + * This trait defines the APIs to be used on the client side to access a broker that is a leader. + */ +trait LeaderEndPoint { + + type FetchData = FetchResponseData.PartitionData + type EpochData = OffsetForLeaderEpochRequestData.OffsetForLeaderPartition + + /** + * A boolean specifying if truncation when fetching from the leader is supported + */ + def isTruncationOnFetchSupported: Boolean + + /** + * Initiate closing access to fetches from leader. + */ + def initiateClose(): Unit + + /** + * Closes access to fetches from leader. + * `initiateClose` must be called prior to invoking `close`. + */ + def close(): Unit + + /** + * The specific broker (host:port) we want to connect to. + */ + def brokerEndPoint(): BrokerEndPoint + + /** + * Given a fetchRequest, carries out the expected request and returns + * the results from fetching from the leader. + * + * @param fetchRequest The fetch request we want to carry out + * + * @return A map of topic partition -> fetch data + */ + def fetch(fetchRequest: FetchRequest.Builder): Map[TopicPartition, FetchData] + + /** + * Fetches the log start offset of the given topic partition, at a specific + * leader epoch, from the leader. + * + * @param topicPartition The topic partition that we want to fetch from + * @param currentLeaderEpoch An int representing the current leader epoch of the requester + * + * @return A long representing the earliest offset in the leader's topic partition. Review Comment: I can add some documentation to the `fetchEarliestOffset` in both implemented endpoint classes to reflect that -- 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. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
