kevin-wu24 commented on code in PR #19589: URL: https://github.com/apache/kafka/pull/19589#discussion_r2077999374
########## raft/src/test/java/org/apache/kafka/raft/KafkaRaftClientAutoJoinTest.java: ########## @@ -0,0 +1,308 @@ +/* + * 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 org.apache.kafka.raft; + +import org.apache.kafka.common.protocol.Errors; +import org.apache.kafka.common.record.MemoryRecords; + +import org.apache.kafka.common.utils.BufferSupplier; +import org.apache.kafka.server.common.KRaftVersion; +import org.junit.jupiter.api.Test; + +import java.util.concurrent.ThreadLocalRandom; +import java.util.stream.Stream; + +import static org.apache.kafka.raft.KafkaRaftClientTest.replicaKey; +import static org.apache.kafka.raft.RaftClientTestContext.RaftProtocol.KIP_595_PROTOCOL; +import static org.apache.kafka.raft.RaftClientTestContext.RaftProtocol.KIP_853_PROTOCOL; + +public class KafkaRaftClientAutoJoinTest { + @Test + public void testAutoRemoveOldVoter() throws Exception { + final var leader = replicaKey(randomReplicaId(), true); + final var oldFollower = replicaKey(leader.id() + 1, true); + final var newFollowerKey = replicaKey(oldFollower.id(), true); + final int epoch = 1; + final var context = new RaftClientTestContext.Builder( + newFollowerKey.id(), + newFollowerKey.directoryId().get() + ) + .withRaftProtocol(KIP_853_PROTOCOL) + .withStartingVoters( + VoterSetTest.voterSet(Stream.of(leader, oldFollower)), KRaftVersion.KRAFT_VERSION_1 + ) + .withElectedLeader(epoch, leader.id()) + .withAutoJoin(true) + .withCanBecomeVoter(true) + .build(); + + context.advanceTimeAndFetchToUpdateVoterSetTimer(epoch, leader.id()); + + context.time.sleep(context.fetchTimeoutMs - 1); + context.pollUntilRequest(); + final var removeRequest = context.assertSentRemoveVoterRequest(oldFollower); + context.deliverResponse( + removeRequest.correlationId(), + removeRequest.destination(), + RaftUtil.removeVoterResponse(Errors.NONE, Errors.NONE.message()) + ); + + // after sending a remove voter the next request should be a fetch + context.pollUntilRequest(); + final var fetchRequest = context.assertSentFetchRequest(); + context.assertFetchRequestData(fetchRequest, epoch, 0L, 0); + } + + @Test + public void testAutoAddNewVoter() throws Exception { + final var leader = replicaKey(randomReplicaId(), true); + final var follower = replicaKey(leader.id() + 1, true); + final var newVoter = replicaKey(follower.id() + 1, true); + final int epoch = 1; + final var context = new RaftClientTestContext.Builder( + newVoter.id(), + newVoter.directoryId().get() + ) + .withRaftProtocol(KIP_853_PROTOCOL) + .withStartingVoters( + VoterSetTest.voterSet(Stream.of(leader, follower)), KRaftVersion.KRAFT_VERSION_1 + ) + .withElectedLeader(epoch, leader.id()) + .withAutoJoin(true) + .withCanBecomeVoter(true) + .build(); + + context.advanceTimeAndFetchToUpdateVoterSetTimer(epoch, leader.id()); + + context.time.sleep(context.fetchTimeoutMs - 1); + context.pollUntilRequest(); + final var addRequest = context.assertSentAddVoterRequest( + newVoter, + context.client.quorum().localVoterNodeOrThrow().listeners() + ); + context.deliverResponse( + addRequest.correlationId(), + addRequest.destination(), + RaftUtil.addVoterResponse(Errors.NONE, Errors.NONE.message()) + ); + + // after sending an add voter the next request should be a fetch + context.pollUntilRequest(); + final var fetchRequest = context.assertSentFetchRequest(); + context.assertFetchRequestData(fetchRequest, epoch, 0L, 0); + } + + @Test + public void testObserverRemovesOldVoterAndAutoJoins() throws Exception { + final var leader = replicaKey(randomReplicaId(), true); + final var oldFollower = replicaKey(leader.id() + 1, true); + final var newFollowerKey = replicaKey(oldFollower.id(), true); + final int epoch = 1; + final var context = new RaftClientTestContext.Builder( + newFollowerKey.id(), + newFollowerKey.directoryId().get() + ) + .withRaftProtocol(KIP_853_PROTOCOL) + .withStartingVoters( + VoterSetTest.voterSet(Stream.of(leader, oldFollower)), KRaftVersion.KRAFT_VERSION_1 + ) + .withElectedLeader(epoch, leader.id()) + .withAutoJoin(true) + .withCanBecomeVoter(true) + .build(); + + // advance time and complete a fetch to trigger the remove voter request + context.advanceTimeAndFetchToUpdateVoterSetTimer(epoch, leader.id()); + context.time.sleep(context.fetchTimeoutMs - 1); + context.pollUntilRequest(); + final var removeRequest = context.assertSentRemoveVoterRequest(oldFollower); + context.deliverResponse( + removeRequest.correlationId(), + removeRequest.destination(), + RaftUtil.removeVoterResponse(Errors.NONE, Errors.NONE.message()) + ); + + // after sending a remove voter the next request should be a fetch + context.pollUntilRequest(); + final var removeVoterFetch = context.assertSentFetchRequest(); + context.assertFetchRequestData( + removeVoterFetch, + epoch, + context.log.endOffset().offset(), + context.log.lastFetchedEpoch() + ); + + // deliver the fetch response with the updated voter set after removing the old voter + var localEndOffset = context.log.endOffset().offset(); + context.deliverResponse( + removeVoterFetch.correlationId(), + removeVoterFetch.destination(), + context.fetchResponse( + epoch, + leader.id(), + MemoryRecords.withVotersRecord( + localEndOffset, + 0, + epoch, + BufferSupplier.NO_CACHING.get(300), + VoterSetTest.voterSet(Stream.of(leader)).toVotersRecord((short) 0)), + localEndOffset + 1, + Errors.NONE + ) + ); + // poll kraft to update the replica's voter set + context.client.poll(); + + // advance time and complete a fetch to trigger the add voter request + context.advanceTimeAndFetchToUpdateVoterSetTimer(epoch, leader.id()); + context.time.sleep(context.fetchTimeoutMs - 1); + context.pollUntilRequest(); + final var addVoterRequest = context.assertSentAddVoterRequest( + newFollowerKey, + context.client.quorum().localVoterNodeOrThrow().listeners() + ); + context.deliverResponse( + addVoterRequest.correlationId(), + addVoterRequest.destination(), + RaftUtil.addVoterResponse(Errors.NONE, Errors.NONE.message()) + ); + + // after sending an add voter the next request should be a fetch + context.pollUntilRequest(); + final var addVoterFetch = context.assertSentFetchRequest(); + context.assertFetchRequestData( + addVoterFetch, + epoch, + context.log.endOffset().offset(), + context.log.lastFetchedEpoch() + ); + + // deliver the fetch response with the updated voter set after adding the observer + localEndOffset = context.log.endOffset().offset(); + context.deliverResponse( + addVoterFetch.correlationId(), + addVoterFetch.destination(), + context.fetchResponse( + epoch, + leader.id(), + MemoryRecords.withVotersRecord( + localEndOffset, + 0, + epoch, + BufferSupplier.NO_CACHING.get(300), + VoterSetTest.voterSet(Stream.of(leader, newFollowerKey)).toVotersRecord((short) 0)), + localEndOffset + 1, + Errors.NONE + ) + ); + // poll kraft to update the replica's voter set + context.client.poll(); Review Comment: Just added and cleaning up this test file for readability, since there's a lot of duplicate code. -- This is an automated message from the Apache Git Service. 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