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IncrementalCooperativeAssignorTest.java
1469 lines (1278 loc) · 74.3 KB
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IncrementalCooperativeAssignorTest.java
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/*
* 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.connect.runtime.distributed;
import org.apache.kafka.clients.consumer.internals.RequestFuture;
import org.apache.kafka.common.utils.LogContext;
import org.apache.kafka.common.utils.MockTime;
import org.apache.kafka.common.utils.Time;
import org.apache.kafka.connect.runtime.TargetState;
import org.apache.kafka.connect.runtime.distributed.WorkerCoordinator.ConnectorsAndTasks;
import org.apache.kafka.connect.util.ConnectorTaskId;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.mockito.ArgumentCaptor;
import org.mockito.Captor;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.junit.MockitoJUnit;
import org.mockito.junit.MockitoRule;
import java.util.AbstractMap.SimpleEntry;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import static org.apache.kafka.connect.runtime.distributed.IncrementalCooperativeConnectProtocol.CONNECT_PROTOCOL_V1;
import static org.apache.kafka.connect.runtime.distributed.IncrementalCooperativeConnectProtocol.CONNECT_PROTOCOL_V2;
import static org.apache.kafka.connect.runtime.distributed.WorkerCoordinator.WorkerLoad;
import static org.hamcrest.CoreMatchers.hasItems;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.runners.Parameterized.Parameter;
import static org.junit.runners.Parameterized.Parameters;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.Mockito.when;
public class IncrementalCooperativeAssignorTest {
@Rule
public MockitoRule rule = MockitoJUnit.rule();
@Mock
private WorkerCoordinator coordinator;
@Captor
ArgumentCaptor<Map<String, ExtendedAssignment>> assignmentsCapture;
@Parameters
public static Iterable<?> mode() {
return Arrays.asList(new Object[][] {{CONNECT_PROTOCOL_V1, CONNECT_PROTOCOL_V2}});
}
@Parameter
public short protocolVersion;
private ClusterConfigState configState;
private Map<String, ExtendedWorkerState> memberConfigs;
private Map<String, ExtendedWorkerState> expectedMemberConfigs;
private long offset;
private String leader;
private String leaderUrl;
private Time time;
private int rebalanceDelay;
private IncrementalCooperativeAssignor assignor;
private int rebalanceNum;
Map<String, ExtendedAssignment> assignments;
Map<String, ExtendedAssignment> returnedAssignments;
@Before
public void setup() {
leader = "worker1";
leaderUrl = expectedLeaderUrl(leader);
offset = 10;
configState = clusterConfigState(offset, 2, 4);
memberConfigs = memberConfigs(leader, offset, 1, 1);
time = Time.SYSTEM;
rebalanceDelay = DistributedConfig.SCHEDULED_REBALANCE_MAX_DELAY_MS_DEFAULT;
assignments = new HashMap<>();
initAssignor();
}
@After
public void teardown() {
verifyNoMoreInteractions(coordinator);
}
public void initAssignor() {
assignor = Mockito.spy(new IncrementalCooperativeAssignor(
new LogContext(),
time,
rebalanceDelay));
assignor.previousGenerationId = 1000;
}
@Test
public void testTaskAssignmentWhenWorkerJoins() {
when(coordinator.configSnapshot()).thenReturn(configState);
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
// First assignment with 1 worker and 2 connectors configured but not yet assigned
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(2, 8, 0, 0, "worker1");
// Second assignment with a second worker joining and all connectors running on previous worker
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
memberConfigs.put("worker2", new ExtendedWorkerState(leaderUrl, offset, null));
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 1, 4, "worker1", "worker2");
// Third assignment after revocations
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(1, 4, 0, 0, "worker1", "worker2");
// A fourth rebalance should not change assignments
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 0, "worker1", "worker2");
verify(coordinator, times(rebalanceNum)).configSnapshot();
verify(coordinator, times(rebalanceNum)).leaderState(any());
verify(coordinator, times(2 * rebalanceNum)).generationId();
verify(coordinator, times(rebalanceNum)).memberId();
verify(coordinator, times(rebalanceNum)).lastCompletedGenerationId();
}
@Test
public void testTaskAssignmentWhenWorkerLeavesPermanently() {
// Customize assignor for this test case
time = new MockTime();
initAssignor();
when(coordinator.configSnapshot()).thenReturn(configState);
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
// First assignment with 2 workers and 2 connectors configured but not yet assigned
memberConfigs.put("worker2", new ExtendedWorkerState(leaderUrl, offset, null));
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(2, 8, 0, 0, "worker1", "worker2");
// Second assignment with only one worker remaining in the group. The worker that left the
// group was a follower. No re-assignments take place immediately and the count
// down for the rebalance delay starts
applyAssignments(returnedAssignments);
assignments.remove("worker2");
memberConfigs = memberConfigs(leader, offset, assignments);
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(rebalanceDelay, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 0, "worker1");
time.sleep(rebalanceDelay / 2);
// Third (incidental) assignment with still only one worker in the group. Max delay has not
// been reached yet
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(rebalanceDelay / 2, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 0, "worker1");
time.sleep(rebalanceDelay / 2 + 1);
// Fourth assignment after delay expired
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(1, 4, 0, 0, "worker1");
verify(coordinator, times(rebalanceNum)).configSnapshot();
verify(coordinator, times(rebalanceNum)).leaderState(any());
verify(coordinator, times(2 * rebalanceNum)).generationId();
verify(coordinator, times(rebalanceNum)).memberId();
verify(coordinator, times(rebalanceNum)).lastCompletedGenerationId();
}
@Test
public void testTaskAssignmentWhenWorkerBounces() {
// Customize assignor for this test case
time = new MockTime();
initAssignor();
when(coordinator.configSnapshot()).thenReturn(configState);
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
// First assignment with 2 workers and 2 connectors configured but not yet assigned
memberConfigs.put("worker2", new ExtendedWorkerState(leaderUrl, offset, null));
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(2, 8, 0, 0, "worker1", "worker2");
// Second assignment with only one worker remaining in the group. The worker that left the
// group was a follower. No re-assignments take place immediately and the count
// down for the rebalance delay starts
applyAssignments(returnedAssignments);
assignments.remove("worker2");
memberConfigs = memberConfigs(leader, offset, assignments);
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(rebalanceDelay, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 0, "worker1");
time.sleep(rebalanceDelay / 2);
// Third (incidental) assignment with still only one worker in the group. Max delay has not
// been reached yet
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(rebalanceDelay / 2, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 0, "worker1");
time.sleep(rebalanceDelay / 4);
// Fourth assignment with the second worker returning before the delay expires
// Since the delay is still active, lost assignments are not reassigned yet
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
memberConfigs.put("worker2", new ExtendedWorkerState(leaderUrl, offset, null));
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(rebalanceDelay / 4, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 0, "worker1", "worker2");
time.sleep(rebalanceDelay / 4);
// Fifth assignment with the same two workers. The delay has expired, so the lost
// assignments ought to be assigned to the worker that has appeared as returned.
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(1, 4, 0, 0, "worker1", "worker2");
verify(coordinator, times(rebalanceNum)).configSnapshot();
verify(coordinator, times(rebalanceNum)).leaderState(any());
verify(coordinator, times(2 * rebalanceNum)).generationId();
verify(coordinator, times(rebalanceNum)).memberId();
verify(coordinator, times(rebalanceNum)).lastCompletedGenerationId();
}
@Test
public void testTaskAssignmentWhenLeaderLeavesPermanently() {
// Customize assignor for this test case
time = new MockTime();
initAssignor();
when(coordinator.configSnapshot()).thenReturn(configState);
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
// First assignment with 3 workers and 2 connectors configured but not yet assigned
memberConfigs.put("worker2", new ExtendedWorkerState(leaderUrl, offset, null));
memberConfigs.put("worker3", new ExtendedWorkerState(leaderUrl, offset, null));
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(2, 8, 0, 0, "worker1", "worker2", "worker3");
// Second assignment with two workers remaining in the group. The worker that left the
// group was the leader. The new leader has no previous assignments and is not tracking a
// delay upon a leader's exit
applyAssignments(returnedAssignments);
assignments.remove("worker1");
leader = "worker2";
leaderUrl = expectedLeaderUrl(leader);
memberConfigs = memberConfigs(leader, offset, assignments);
// The fact that the leader bounces means that the assignor starts from a clean slate
initAssignor();
// Capture needs to be reset to point to the new assignor
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(1, 3, 0, 0, "worker2", "worker3");
// Third (incidental) assignment with still only one worker in the group.
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 0, "worker2", "worker3");
verify(coordinator, times(rebalanceNum)).configSnapshot();
verify(coordinator, times(rebalanceNum)).leaderState(any());
verify(coordinator, times(2 * rebalanceNum)).generationId();
verify(coordinator, times(rebalanceNum)).memberId();
verify(coordinator, times(rebalanceNum)).lastCompletedGenerationId();
}
@Test
public void testTaskAssignmentWhenLeaderBounces() {
// Customize assignor for this test case
time = new MockTime();
initAssignor();
when(coordinator.configSnapshot()).thenReturn(configState);
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
// First assignment with 3 workers and 2 connectors configured but not yet assigned
memberConfigs.put("worker2", new ExtendedWorkerState(leaderUrl, offset, null));
memberConfigs.put("worker3", new ExtendedWorkerState(leaderUrl, offset, null));
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(2, 8, 0, 0, "worker1", "worker2", "worker3");
// Second assignment with two workers remaining in the group. The worker that left the
// group was the leader. The new leader has no previous assignments and is not tracking a
// delay upon a leader's exit
applyAssignments(returnedAssignments);
assignments.remove("worker1");
leader = "worker2";
leaderUrl = expectedLeaderUrl(leader);
memberConfigs = memberConfigs(leader, offset, assignments);
// The fact that the leader bounces means that the assignor starts from a clean slate
initAssignor();
// Capture needs to be reset to point to the new assignor
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(1, 3, 0, 0, "worker2", "worker3");
// Third assignment with the previous leader returning as a follower. In this case, the
// arrival of the previous leader is treated as an arrival of a new worker. Reassignment
// happens immediately, first with a revocation
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
memberConfigs.put("worker1", new ExtendedWorkerState(leaderUrl, offset, null));
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 2, "worker1", "worker2", "worker3");
// Fourth assignment after revocations
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 2, 0, 0, "worker1", "worker2", "worker3");
verify(coordinator, times(rebalanceNum)).configSnapshot();
verify(coordinator, times(rebalanceNum)).leaderState(any());
verify(coordinator, times(2 * rebalanceNum)).generationId();
verify(coordinator, times(rebalanceNum)).memberId();
verify(coordinator, times(rebalanceNum)).lastCompletedGenerationId();
}
@Test
public void testTaskAssignmentWhenFirstAssignmentAttemptFails() {
// Customize assignor for this test case
time = new MockTime();
initAssignor();
when(coordinator.configSnapshot()).thenReturn(configState);
doThrow(new RuntimeException("Unable to send computed assignment with SyncGroupRequest"))
.when(assignor).serializeAssignments(assignmentsCapture.capture());
// First assignment with 2 workers and 2 connectors configured but not yet assigned
memberConfigs.put("worker2", new ExtendedWorkerState(leaderUrl, offset, null));
try {
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
} catch (RuntimeException e) {
RequestFuture.failure(e);
}
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
// This was the assignment that should have been sent, but didn't make it all the way
assertDelay(0, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(2, 8, 0, 0, "worker1", "worker2");
// Second assignment happens with members returning the same assignments (memberConfigs)
// as the first time. The assignor detects that the number of members did not change and
// avoids the rebalance delay, treating the lost assignments as new assignments.
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(2, 8, 0, 0, "worker1", "worker2");
verify(coordinator, times(rebalanceNum)).configSnapshot();
verify(coordinator, times(rebalanceNum)).leaderState(any());
verify(coordinator, times(2 * rebalanceNum)).generationId();
verify(coordinator, times(rebalanceNum)).memberId();
verify(coordinator, times(rebalanceNum)).lastCompletedGenerationId();
}
@Test
public void testTaskAssignmentWhenSubsequentAssignmentAttemptFails() {
// Customize assignor for this test case
time = new MockTime();
initAssignor();
when(coordinator.configSnapshot()).thenReturn(configState);
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
// First assignment with 2 workers and 2 connectors configured but not yet assigned
memberConfigs.put("worker2", new ExtendedWorkerState(leaderUrl, offset, null));
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(2, 8, 0, 0, "worker1", "worker2");
when(coordinator.configSnapshot()).thenReturn(configState);
doThrow(new RuntimeException("Unable to send computed assignment with SyncGroupRequest"))
.when(assignor).serializeAssignments(assignmentsCapture.capture());
// Second assignment triggered by a third worker joining. The computed assignment should
// revoke tasks from the existing group. But the assignment won't be correctly delivered.
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
memberConfigs.put("worker3", new ExtendedWorkerState(leaderUrl, offset, null));
try {
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
} catch (RuntimeException e) {
RequestFuture.failure(e);
}
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
// This was the assignment that should have been sent, but didn't make it all the way
assertDelay(0, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 2, "worker1", "worker2", "worker3");
// Third assignment happens with members returning the same assignments (memberConfigs)
// as the first time.
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertDelay(0, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 2, "worker1", "worker2", "worker3");
verify(coordinator, times(rebalanceNum)).configSnapshot();
verify(coordinator, times(rebalanceNum)).leaderState(any());
verify(coordinator, times(2 * rebalanceNum)).generationId();
verify(coordinator, times(rebalanceNum)).memberId();
verify(coordinator, times(rebalanceNum)).lastCompletedGenerationId();
}
@Test
public void testTaskAssignmentWhenSubsequentAssignmentAttemptFailsOutsideTheAssignor() {
// Customize assignor for this test case
time = new MockTime();
initAssignor();
expectGeneration();
when(coordinator.configSnapshot()).thenReturn(configState);
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
// First assignment with 2 workers and 2 connectors configured but not yet assigned
memberConfigs.put("worker2", new ExtendedWorkerState(leaderUrl, offset, null));
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(2, 8, 0, 0, "worker1", "worker2");
// Second assignment triggered by a third worker joining. The computed assignment should
// revoke tasks from the existing group. But the assignment won't be correctly delivered
// and sync group with fail on the leader worker.
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
memberConfigs.put("worker3", new ExtendedWorkerState(leaderUrl, offset, null));
when(coordinator.generationId())
.thenReturn(assignor.previousGenerationId + 1)
.thenReturn(assignor.previousGenerationId + 1);
when(coordinator.lastCompletedGenerationId()).thenReturn(assignor.previousGenerationId - 1);
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
// This was the assignment that should have been sent, but didn't make it all the way
assertDelay(0, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 2, "worker1", "worker2", "worker3");
// Third assignment happens with members returning the same assignments (memberConfigs)
// as the first time.
when(coordinator.lastCompletedGenerationId()).thenReturn(assignor.previousGenerationId - 1);
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertDelay(0, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 0, 2, "worker1", "worker2", "worker3");
verify(coordinator, times(rebalanceNum)).configSnapshot();
verify(coordinator, times(rebalanceNum)).leaderState(any());
verify(coordinator, times(2 * rebalanceNum)).generationId();
verify(coordinator, times(rebalanceNum)).memberId();
verify(coordinator, times(rebalanceNum)).lastCompletedGenerationId();
}
@Test
public void testTaskAssignmentWhenConnectorsAreDeleted() {
configState = clusterConfigState(offset, 3, 4);
when(coordinator.configSnapshot()).thenReturn(configState);
doReturn(Collections.EMPTY_MAP).when(assignor).serializeAssignments(assignmentsCapture.capture());
// First assignment with 1 worker and 2 connectors configured but not yet assigned
memberConfigs.put("worker2", new ExtendedWorkerState(leaderUrl, offset, null));
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(3, 12, 0, 0, "worker1", "worker2");
// Second assignment with an updated config state that reflects removal of a connector
configState = clusterConfigState(offset + 1, 2, 4);
when(coordinator.configSnapshot()).thenReturn(configState);
applyAssignments(returnedAssignments);
memberConfigs = memberConfigs(leader, offset, assignments);
expectGeneration();
assignor.performTaskAssignment(leader, offset, memberConfigs, coordinator, protocolVersion);
++rebalanceNum;
returnedAssignments = assignmentsCapture.getValue();
assertDelay(0, returnedAssignments);
expectedMemberConfigs = memberConfigs(leader, offset, returnedAssignments);
assertNoReassignments(memberConfigs, expectedMemberConfigs);
assertAssignment(0, 0, 1, 4, "worker1", "worker2");
verify(coordinator, times(rebalanceNum)).configSnapshot();
verify(coordinator, times(rebalanceNum)).leaderState(any());
verify(coordinator, times(2 * rebalanceNum)).generationId();
verify(coordinator, times(rebalanceNum)).memberId();
verify(coordinator, times(rebalanceNum)).lastCompletedGenerationId();
}
@Test
public void testAssignConnectorsWhenBalanced() {
int num = 2;
List<WorkerLoad> existingAssignment = IntStream.range(0, 3)
.mapToObj(i -> workerLoad("worker" + i, i * num, num, i * num, num))
.collect(Collectors.toList());
List<WorkerLoad> expectedAssignment = existingAssignment.stream()
.map(wl -> new WorkerLoad.Builder(wl.worker()).withCopies(wl.connectors(), wl.tasks()).build())
.collect(Collectors.toList());
expectedAssignment.get(0).connectors().addAll(Arrays.asList("connector6", "connector9"));
expectedAssignment.get(1).connectors().addAll(Arrays.asList("connector7", "connector10"));
expectedAssignment.get(2).connectors().addAll(Arrays.asList("connector8"));
List<String> newConnectors = newConnectors(6, 11);
assignor.assignConnectors(existingAssignment, newConnectors);
assertEquals(expectedAssignment, existingAssignment);
}
@Test
public void testAssignTasksWhenBalanced() {
int num = 2;
List<WorkerLoad> existingAssignment = IntStream.range(0, 3)
.mapToObj(i -> workerLoad("worker" + i, i * num, num, i * num, num))
.collect(Collectors.toList());
List<WorkerLoad> expectedAssignment = existingAssignment.stream()
.map(wl -> new WorkerLoad.Builder(wl.worker()).withCopies(wl.connectors(), wl.tasks()).build())
.collect(Collectors.toList());
expectedAssignment.get(0).connectors().addAll(Arrays.asList("connector6", "connector9"));
expectedAssignment.get(1).connectors().addAll(Arrays.asList("connector7", "connector10"));
expectedAssignment.get(2).connectors().addAll(Arrays.asList("connector8"));
expectedAssignment.get(0).tasks().addAll(Arrays.asList(new ConnectorTaskId("task", 6), new ConnectorTaskId("task", 9)));
expectedAssignment.get(1).tasks().addAll(Arrays.asList(new ConnectorTaskId("task", 7), new ConnectorTaskId("task", 10)));
expectedAssignment.get(2).tasks().addAll(Arrays.asList(new ConnectorTaskId("task", 8)));
List<String> newConnectors = newConnectors(6, 11);
assignor.assignConnectors(existingAssignment, newConnectors);
List<ConnectorTaskId> newTasks = newTasks(6, 11);
assignor.assignTasks(existingAssignment, newTasks);
assertEquals(expectedAssignment, existingAssignment);
}
@Test
public void testAssignConnectorsWhenImbalanced() {
List<WorkerLoad> existingAssignment = new ArrayList<>();
existingAssignment.add(workerLoad("worker0", 0, 2, 0, 2));
existingAssignment.add(workerLoad("worker1", 2, 3, 2, 3));
existingAssignment.add(workerLoad("worker2", 5, 4, 5, 4));
existingAssignment.add(emptyWorkerLoad("worker3"));
List<String> newConnectors = newConnectors(9, 24);
List<ConnectorTaskId> newTasks = newTasks(9, 24);
assignor.assignConnectors(existingAssignment, newConnectors);
assignor.assignTasks(existingAssignment, newTasks);
for (WorkerLoad worker : existingAssignment) {
assertEquals(6, worker.connectorsSize());
assertEquals(6, worker.tasksSize());
}
}
@Test
public void testLostAssignmentHandlingWhenWorkerBounces() {
// Customize assignor for this test case
time = new MockTime();
initAssignor();
assertTrue(assignor.candidateWorkersForReassignment.isEmpty());
assertEquals(0, assignor.scheduledRebalance);
assertEquals(0, assignor.delay);
Map<String, WorkerLoad> configuredAssignment = new HashMap<>();
configuredAssignment.put("worker0", workerLoad("worker0", 0, 2, 0, 4));
configuredAssignment.put("worker1", workerLoad("worker1", 2, 2, 4, 4));
configuredAssignment.put("worker2", workerLoad("worker2", 4, 2, 8, 4));
memberConfigs = memberConfigs(leader, offset, 0, 2);
ConnectorsAndTasks newSubmissions = new ConnectorsAndTasks.Builder().build();
// No lost assignments
assignor.handleLostAssignments(new ConnectorsAndTasks.Builder().build(),
newSubmissions,
new ArrayList<>(configuredAssignment.values()),
memberConfigs);
assertThat("Wrong set of workers for reassignments",
Collections.emptySet(),
is(assignor.candidateWorkersForReassignment));
assertEquals(0, assignor.scheduledRebalance);
assertEquals(0, assignor.delay);
assignor.previousMembers = new HashSet<>(memberConfigs.keySet());
String flakyWorker = "worker1";
WorkerLoad lostLoad = workerLoad(flakyWorker, 2, 2, 4, 4);
memberConfigs.remove(flakyWorker);
ConnectorsAndTasks lostAssignments = new ConnectorsAndTasks.Builder()
.withCopies(lostLoad.connectors(), lostLoad.tasks()).build();
// Lost assignments detected - No candidate worker has appeared yet (worker with no assignments)
assignor.handleLostAssignments(lostAssignments, newSubmissions,
new ArrayList<>(configuredAssignment.values()), memberConfigs);
assertThat("Wrong set of workers for reassignments",
Collections.emptySet(),
is(assignor.candidateWorkersForReassignment));
assertEquals(time.milliseconds() + rebalanceDelay, assignor.scheduledRebalance);
assertEquals(rebalanceDelay, assignor.delay);
assignor.previousMembers = new HashSet<>(memberConfigs.keySet());
time.sleep(rebalanceDelay / 2);
rebalanceDelay /= 2;
// A new worker (probably returning worker) has joined
configuredAssignment.put(flakyWorker, new WorkerLoad.Builder(flakyWorker).build());
memberConfigs.put(flakyWorker, new ExtendedWorkerState(leaderUrl, offset, null));
assignor.handleLostAssignments(lostAssignments, newSubmissions,
new ArrayList<>(configuredAssignment.values()), memberConfigs);
assertThat("Wrong set of workers for reassignments",
Collections.singleton(flakyWorker),
is(assignor.candidateWorkersForReassignment));
assertEquals(time.milliseconds() + rebalanceDelay, assignor.scheduledRebalance);
assertEquals(rebalanceDelay, assignor.delay);
assignor.previousMembers = new HashSet<>(memberConfigs.keySet());
time.sleep(rebalanceDelay);
// The new worker has still no assignments
assignor.handleLostAssignments(lostAssignments, newSubmissions,
new ArrayList<>(configuredAssignment.values()), memberConfigs);
assertTrue("Wrong assignment of lost connectors",
configuredAssignment.getOrDefault(flakyWorker, new WorkerLoad.Builder(flakyWorker).build())
.connectors()
.containsAll(lostAssignments.connectors()));
assertTrue("Wrong assignment of lost tasks",
configuredAssignment.getOrDefault(flakyWorker, new WorkerLoad.Builder(flakyWorker).build())
.tasks()
.containsAll(lostAssignments.tasks()));
assertThat("Wrong set of workers for reassignments",
Collections.emptySet(),
is(assignor.candidateWorkersForReassignment));
assertEquals(0, assignor.scheduledRebalance);
assertEquals(0, assignor.delay);
}
@Test
public void testLostAssignmentHandlingWhenWorkerLeavesPermanently() {
// Customize assignor for this test case
time = new MockTime();
initAssignor();
assertTrue(assignor.candidateWorkersForReassignment.isEmpty());
assertEquals(0, assignor.scheduledRebalance);
assertEquals(0, assignor.delay);
Map<String, WorkerLoad> configuredAssignment = new HashMap<>();
configuredAssignment.put("worker0", workerLoad("worker0", 0, 2, 0, 4));
configuredAssignment.put("worker1", workerLoad("worker1", 2, 2, 4, 4));
configuredAssignment.put("worker2", workerLoad("worker2", 4, 2, 8, 4));
memberConfigs = memberConfigs(leader, offset, 0, 2);
ConnectorsAndTasks newSubmissions = new ConnectorsAndTasks.Builder().build();
// No lost assignments
assignor.handleLostAssignments(new ConnectorsAndTasks.Builder().build(),
newSubmissions,
new ArrayList<>(configuredAssignment.values()),
memberConfigs);
assertThat("Wrong set of workers for reassignments",
Collections.emptySet(),
is(assignor.candidateWorkersForReassignment));
assertEquals(0, assignor.scheduledRebalance);
assertEquals(0, assignor.delay);
assignor.previousMembers = new HashSet<>(memberConfigs.keySet());
String removedWorker = "worker1";
WorkerLoad lostLoad = workerLoad(removedWorker, 2, 2, 4, 4);
memberConfigs.remove(removedWorker);
ConnectorsAndTasks lostAssignments = new ConnectorsAndTasks.Builder()
.withCopies(lostLoad.connectors(), lostLoad.tasks()).build();
// Lost assignments detected - No candidate worker has appeared yet (worker with no assignments)
assignor.handleLostAssignments(lostAssignments, newSubmissions,
new ArrayList<>(configuredAssignment.values()), memberConfigs);
assertThat("Wrong set of workers for reassignments",
Collections.emptySet(),
is(assignor.candidateWorkersForReassignment));
assertEquals(time.milliseconds() + rebalanceDelay, assignor.scheduledRebalance);
assertEquals(rebalanceDelay, assignor.delay);
assignor.previousMembers = new HashSet<>(memberConfigs.keySet());
time.sleep(rebalanceDelay / 2);
rebalanceDelay /= 2;
// No new worker has joined
assignor.handleLostAssignments(lostAssignments, newSubmissions,
new ArrayList<>(configuredAssignment.values()), memberConfigs);
assertThat("Wrong set of workers for reassignments",
Collections.emptySet(),
is(assignor.candidateWorkersForReassignment));
assertEquals(time.milliseconds() + rebalanceDelay, assignor.scheduledRebalance);
assertEquals(rebalanceDelay, assignor.delay);
time.sleep(rebalanceDelay);
assignor.handleLostAssignments(lostAssignments, newSubmissions,
new ArrayList<>(configuredAssignment.values()), memberConfigs);
assertTrue("Wrong assignment of lost connectors",
newSubmissions.connectors().containsAll(lostAssignments.connectors()));
assertTrue("Wrong assignment of lost tasks",
newSubmissions.tasks().containsAll(lostAssignments.tasks()));
assertThat("Wrong set of workers for reassignments",
Collections.emptySet(),
is(assignor.candidateWorkersForReassignment));
assertEquals(0, assignor.scheduledRebalance);
assertEquals(0, assignor.delay);
}
@Test
public void testLostAssignmentHandlingWithMoreThanOneCandidates() {
// Customize assignor for this test case
time = new MockTime();
initAssignor();
assertTrue(assignor.candidateWorkersForReassignment.isEmpty());
assertEquals(0, assignor.scheduledRebalance);
assertEquals(0, assignor.delay);
Map<String, WorkerLoad> configuredAssignment = new HashMap<>();
configuredAssignment.put("worker0", workerLoad("worker0", 0, 2, 0, 4));
configuredAssignment.put("worker1", workerLoad("worker1", 2, 2, 4, 4));
configuredAssignment.put("worker2", workerLoad("worker2", 4, 2, 8, 4));
memberConfigs = memberConfigs(leader, offset, 0, 2);
ConnectorsAndTasks newSubmissions = new ConnectorsAndTasks.Builder().build();
// No lost assignments
assignor.handleLostAssignments(new ConnectorsAndTasks.Builder().build(),
newSubmissions,
new ArrayList<>(configuredAssignment.values()),
memberConfigs);
assertThat("Wrong set of workers for reassignments",
Collections.emptySet(),
is(assignor.candidateWorkersForReassignment));
assertEquals(0, assignor.scheduledRebalance);
assertEquals(0, assignor.delay);
assignor.previousMembers = new HashSet<>(memberConfigs.keySet());
String flakyWorker = "worker1";
WorkerLoad lostLoad = workerLoad(flakyWorker, 2, 2, 4, 4);
memberConfigs.remove(flakyWorker);
String newWorker = "worker3";
ConnectorsAndTasks lostAssignments = new ConnectorsAndTasks.Builder()
.withCopies(lostLoad.connectors(), lostLoad.tasks()).build();
// Lost assignments detected - A new worker also has joined that is not the returning worker
configuredAssignment.put(newWorker, new WorkerLoad.Builder(newWorker).build());
memberConfigs.put(newWorker, new ExtendedWorkerState(leaderUrl, offset, null));
assignor.handleLostAssignments(lostAssignments, newSubmissions,
new ArrayList<>(configuredAssignment.values()), memberConfigs);
assertThat("Wrong set of workers for reassignments",
Collections.singleton(newWorker),
is(assignor.candidateWorkersForReassignment));
assertEquals(time.milliseconds() + rebalanceDelay, assignor.scheduledRebalance);
assertEquals(rebalanceDelay, assignor.delay);
assignor.previousMembers = new HashSet<>(memberConfigs.keySet());
time.sleep(rebalanceDelay / 2);
rebalanceDelay /= 2;
// Now two new workers have joined
configuredAssignment.put(flakyWorker, new WorkerLoad.Builder(flakyWorker).build());
memberConfigs.put(flakyWorker, new ExtendedWorkerState(leaderUrl, offset, null));
assignor.handleLostAssignments(lostAssignments, newSubmissions,
new ArrayList<>(configuredAssignment.values()), memberConfigs);
Set<String> expectedWorkers = new HashSet<>();
expectedWorkers.addAll(Arrays.asList(newWorker, flakyWorker));
assertThat("Wrong set of workers for reassignments",
expectedWorkers,
is(assignor.candidateWorkersForReassignment));
assertEquals(time.milliseconds() + rebalanceDelay, assignor.scheduledRebalance);
assertEquals(rebalanceDelay, assignor.delay);
assignor.previousMembers = new HashSet<>(memberConfigs.keySet());
time.sleep(rebalanceDelay);
// The new workers have new assignments, other than the lost ones
configuredAssignment.put(flakyWorker, workerLoad(flakyWorker, 6, 2, 8, 4));
configuredAssignment.put(newWorker, workerLoad(newWorker, 8, 2, 12, 4));
// we don't reflect these new assignments in memberConfigs currently because they are not
// used in handleLostAssignments method
assignor.handleLostAssignments(lostAssignments, newSubmissions,
new ArrayList<>(configuredAssignment.values()), memberConfigs);
// both the newWorkers would need to be considered for re assignment of connectors and tasks
List<String> listOfConnectorsInLast2Workers = new ArrayList<>();
listOfConnectorsInLast2Workers.addAll(configuredAssignment.getOrDefault(newWorker, new WorkerLoad.Builder(flakyWorker).build())
.connectors());
listOfConnectorsInLast2Workers.addAll(configuredAssignment.getOrDefault(flakyWorker, new WorkerLoad.Builder(flakyWorker).build())
.connectors());
List<ConnectorTaskId> listOfTasksInLast2Workers = new ArrayList<>();
listOfTasksInLast2Workers.addAll(configuredAssignment.getOrDefault(newWorker, new WorkerLoad.Builder(flakyWorker).build())
.tasks());