jsancio commented on code in PR #19589:
URL: https://github.com/apache/kafka/pull/19589#discussion_r2077854157
##########
raft/src/main/java/org/apache/kafka/raft/KafkaNetworkChannel.java:
##########
@@ -178,6 +182,7 @@ public void pollOnce() {
requestThread.doWork();
}
+ @SuppressWarnings("NPathComplexity")
Review Comment:
Try using `if (...) { return } else if (...) { return } ...` and see if that
reduces the path complexity so you can remove this suppression.
You can also try using Java's new pattern matching and lambda syntax for
switch statements. E.g.
```java
return switch (requestData) {
case VoterRequestData voterData -> new VoterRequest.Builder(voterData);
...
default -> throw new IllegalArgumentException(...);
}
```
##########
raft/src/main/java/org/apache/kafka/raft/KafkaRaftClient.java:
##########
@@ -3266,14 +3304,45 @@ private long pollFollowerAsVoter(FollowerState state,
long currentTimeMs) {
backoffMs,
Math.min(
state.remainingFetchTimeMs(currentTimeMs),
- state.remainingUpdateVoterPeriodMs(currentTimeMs)
+ state.remainingUpdateVoterSetPeriodMs(currentTimeMs)
)
);
}
private long pollFollowerAsObserver(FollowerState state, long
currentTimeMs) {
if (state.hasFetchTimeoutExpired(currentTimeMs)) {
return maybeSendFetchToAnyBootstrap(currentTimeMs);
+ } else if (partitionState.lastKraftVersion().isReconfigSupported() &&
canBecomeVoter &&
+ quorumConfig.autoJoin() &&
state.hasUpdateVoterSetPeriodExpired(currentTimeMs)) {
+ /* Only replicas that are always flushing and are configured to
auto join should
Review Comment:
Replace "are always flushing" with "can become a voter."
##########
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:
How about adding this time advancement and showing that the replica sent a
fetch request?
```java
context.advanceTimeAndFetchToUpdateVoterSetTimer(epoch, leader.id());
context.time.sleep(context.fetchTimeoutMs - 1);
```
##########
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)),
Review Comment:
Missing newline.
```java
VoterSetTest.voterSet(Stream.of(leader,
newFollowerKey)).toVotersRecord((short) 0)
),
```
##########
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)),
Review Comment:
Missing newline.
```java
VoterSetTest.voterSet(Stream.of(leader)).toVotersRecord((short) 0)
),
```
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