rreddy-22 commented on code in PR #13443: URL: https://github.com/apache/kafka/pull/13443#discussion_r1188823115
########## group-coordinator/src/test/java/org/apache/kafka/coordinator/group/assignor/RangeAssignorTest.java: ########## @@ -0,0 +1,523 @@ +/* + * 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.coordinator.group.assignor; + +import org.apache.kafka.common.Uuid; + +import org.junit.jupiter.api.Test; + +import java.util.Arrays; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Map; +import java.util.Optional; +import java.util.Set; +import java.util.TreeMap; + +import static org.apache.kafka.coordinator.group.AssignmentTestUtil.mkAssignment; +import static org.apache.kafka.coordinator.group.AssignmentTestUtil.mkTopicAssignment; +import static org.junit.jupiter.api.Assertions.assertEquals; +import static org.junit.jupiter.api.Assertions.assertNull; +import static org.junit.jupiter.api.Assertions.assertTrue; + +public class RangeAssignorTest { + private final RangeAssignor assignor = new RangeAssignor(); + private final Uuid topic1Uuid = Uuid.randomUuid(); + private final Uuid topic2Uuid = Uuid.randomUuid(); + private final Uuid topic3Uuid = Uuid.randomUuid(); + private final String consumerA = "A"; + private final String consumerB = "B"; + private final String consumerC = "C"; + + @Test + public void testOneConsumerNoTopic() { + Map<Uuid, AssignmentTopicMetadata> topics = Collections.singletonMap(topic1Uuid, new AssignmentTopicMetadata(3)); + Map<String, AssignmentMemberSpec> members = Collections.singletonMap( + consumerA, + new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.emptyList(), + Collections.emptyMap() + ) + ); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment groupAssignment = assignor.assign(assignmentSpec); + + assertEquals(Collections.emptyMap(), groupAssignment.members()); + } + + @Test + public void testOneConsumerSubscribedToNonExistentTopic() { + Map<Uuid, AssignmentTopicMetadata> topics = Collections.singletonMap(topic1Uuid, new AssignmentTopicMetadata(3)); + Map<String, AssignmentMemberSpec> members = Collections.singletonMap( + consumerA, + new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.singletonList(topic2Uuid), + Collections.emptyMap() + ) + ); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment groupAssignment = assignor.assign(assignmentSpec); + + assertTrue(groupAssignment.members().isEmpty()); + } + + @Test + public void testFirstAssignmentTwoConsumersTwoTopicsSameSubscriptions() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic3Uuid, new AssignmentTopicMetadata(2)); + + Map<String, AssignmentMemberSpec> members = new TreeMap<>(); + + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic3Uuid), + Collections.emptyMap() + )); + + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic3Uuid), + Collections.emptyMap() + )); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<String, Map<Uuid, Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + expectedAssignment.put(consumerA, mkAssignment(mkTopicAssignment(topic1Uuid, 0, 1))); + expectedAssignment.put(consumerB, mkAssignment(mkTopicAssignment(topic1Uuid, 2))); + // Topic 3 Partitions Assignment + expectedAssignment.get(consumerA).putAll(mkAssignment(mkTopicAssignment(topic3Uuid, 0))); + expectedAssignment.get(consumerB).putAll(mkAssignment(mkTopicAssignment(topic3Uuid, 1))); + + assertAssignment(expectedAssignment, computedAssignment); + } + + @Test + public void testFirstAssignmentThreeConsumersThreeTopicsDifferentSubscriptions() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic3Uuid, new AssignmentTopicMetadata(2)); + + Map<String, AssignmentMemberSpec> members = new TreeMap<>(); + + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + Collections.emptyMap() + )); + + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.singletonList(topic3Uuid), + Collections.emptyMap() + )); + + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic2Uuid, topic3Uuid), + Collections.emptyMap() + )); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<String, Map<Uuid, Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + expectedAssignment.put(consumerA, mkAssignment(mkTopicAssignment(topic1Uuid, 0, 1, 2))); + // Topic 2 Partitions Assignment + expectedAssignment.get(consumerA).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 0, 1))); + expectedAssignment.put(consumerC, mkAssignment(mkTopicAssignment(topic2Uuid, 2))); + // Topic 3 Partitions Assignment + expectedAssignment.put(consumerB, mkAssignment(mkTopicAssignment(topic3Uuid, 0))); + expectedAssignment.get(consumerC).putAll(mkAssignment(mkTopicAssignment(topic3Uuid, 1))); + + assertAssignment(expectedAssignment, computedAssignment); + } + + @Test + public void testFirstAssignmentNumConsumersGreaterThanNumPartitions() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic3Uuid, new AssignmentTopicMetadata(2)); + + Map<String, AssignmentMemberSpec> members = new TreeMap<>(); + + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic3Uuid), + Collections.emptyMap() + )); + + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic3Uuid), + Collections.emptyMap() + )); + + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic3Uuid), + Collections.emptyMap() + )); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<String, Map<Uuid, Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 3 has 2 partitions but three consumers subscribed to it - one of them will not get a partition. + // Topic 1 Partitions Assignment + expectedAssignment.put(consumerA, mkAssignment(mkTopicAssignment(topic1Uuid, 0))); + expectedAssignment.put(consumerB, mkAssignment(mkTopicAssignment(topic1Uuid, 1))); + expectedAssignment.put(consumerC, mkAssignment(mkTopicAssignment(topic1Uuid, 2))); + // Topic 3 Partitions Assignment + expectedAssignment.get(consumerA).putAll(mkAssignment(mkTopicAssignment(topic3Uuid, 0))); + expectedAssignment.get(consumerB).putAll(mkAssignment(mkTopicAssignment(topic3Uuid, 1))); + + assertAssignment(expectedAssignment, computedAssignment); + } + + @Test + public void testReassignmentNumConsumersGreaterThanNumPartitionsWhenOneConsumerAdded() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(2)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(2)); + + Map<String, AssignmentMemberSpec> members = new TreeMap<>(); + + Map<Uuid, Set<Integer>> currentAssignmentForA = new HashMap<>(); + currentAssignmentForA.put(topic1Uuid, Collections.singleton(0)); + currentAssignmentForA.put(topic2Uuid, Collections.singleton(0)); + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForA + )); + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic1Uuid, Collections.singleton(1)); + currentAssignmentForB.put(topic2Uuid, Collections.singleton(1)); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForB + )); + + // Add a new consumer to trigger a re-assignment + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + Collections.emptyMap() + )); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<String, Map<Uuid, Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + expectedAssignment.put(consumerA, mkAssignment(mkTopicAssignment(topic1Uuid, 0))); + expectedAssignment.put(consumerB, mkAssignment(mkTopicAssignment(topic1Uuid, 1))); + // Topic 2 Partitions Assignment + expectedAssignment.get(consumerA).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 0))); + expectedAssignment.get(consumerB).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 1))); + + // Consumer C shouldn't get any assignment, due to stickiness A, B retain their assignments + assertNull(computedAssignment.members().get(consumerC)); + assertAssignment(expectedAssignment, computedAssignment); + assertCoPartitionJoinProperty(computedAssignment); + } + + @Test + public void testReassignmentWhenOnePartitionAddedForTwoConsumersTwoTopics() { + // Simulating adding a partition - originally T1 -> 3 Partitions and T2 -> 3 Partitions + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(4)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(4)); + + Map<String, AssignmentMemberSpec> members = new TreeMap<>(); + + Map<Uuid, Set<Integer>> currentAssignmentForA = new HashMap<>(); + currentAssignmentForA.put(topic1Uuid, new HashSet<>(Arrays.asList(0, 1))); + currentAssignmentForA.put(topic2Uuid, new HashSet<>(Arrays.asList(0, 1))); + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForA + )); + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic1Uuid, Collections.singleton(2)); + currentAssignmentForB.put(topic2Uuid, Collections.singleton(2)); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForB + )); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<String, Map<Uuid, Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + expectedAssignment.put(consumerA, mkAssignment(mkTopicAssignment(topic1Uuid, 0, 1))); + expectedAssignment.put(consumerB, mkAssignment(mkTopicAssignment(topic1Uuid, 2, 3))); + // Topic 2 Partitions Assignment + expectedAssignment.get(consumerA).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 0, 1))); + expectedAssignment.get(consumerB).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 2, 3))); + + assertAssignment(expectedAssignment, computedAssignment); + assertCoPartitionJoinProperty(computedAssignment); + } + + @Test + public void testReassignmentWhenOneConsumerAddedAfterInitialAssignmentWithTwoConsumersTwoTopics() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(3)); + + Map<String, AssignmentMemberSpec> members = new TreeMap<>(); + + Map<Uuid, Set<Integer>> currentAssignmentForA = new HashMap<>(); + currentAssignmentForA.put(topic1Uuid, new HashSet<>(Arrays.asList(0, 1))); + currentAssignmentForA.put(topic2Uuid, new HashSet<>(Arrays.asList(0, 1))); + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForA + )); + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic1Uuid, Collections.singleton(2)); + currentAssignmentForB.put(topic2Uuid, Collections.singleton(2)); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForB + )); + + // Add a new consumer to trigger a re-assignment + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + Collections.emptyMap() + )); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<String, Map<Uuid, Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + expectedAssignment.put(consumerA, mkAssignment(mkTopicAssignment(topic1Uuid, 0))); + expectedAssignment.put(consumerB, mkAssignment(mkTopicAssignment(topic1Uuid, 2))); + expectedAssignment.put(consumerC, mkAssignment(mkTopicAssignment(topic1Uuid, 1))); + // Topic 2 Partitions Assignment + expectedAssignment.get(consumerA).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 0))); + expectedAssignment.get(consumerB).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 2))); + expectedAssignment.get(consumerC).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 1))); + + assertAssignment(expectedAssignment, computedAssignment); + assertCoPartitionJoinProperty(computedAssignment); + } + + @Test + public void testReassignmentWhenOneConsumerAddedAndOnePartitionAfterInitialAssignmentWithTwoConsumersTwoTopics() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + // Add a new partition to topic 1, initially T1 -> 3 partitions + topics.put(topic1Uuid, new AssignmentTopicMetadata(4)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(3)); + + Map<String, AssignmentMemberSpec> members = new TreeMap<>(); + + Map<Uuid, Set<Integer>> currentAssignmentForA = new HashMap<>(); + currentAssignmentForA.put(topic1Uuid, new HashSet<>(Arrays.asList(0, 1))); + currentAssignmentForA.put(topic2Uuid, new HashSet<>(Arrays.asList(0, 1))); + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForA + )); + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic1Uuid, Collections.singleton(2)); + currentAssignmentForB.put(topic2Uuid, Collections.singleton(2)); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForB + )); + + // Add a new consumer to trigger a re-assignment + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.singletonList(topic1Uuid), + Collections.emptyMap() + )); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<String, Map<Uuid, Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + expectedAssignment.put(consumerA, mkAssignment(mkTopicAssignment(topic1Uuid, 0, 1))); + expectedAssignment.put(consumerB, mkAssignment(mkTopicAssignment(topic1Uuid, 2))); + expectedAssignment.put(consumerC, mkAssignment(mkTopicAssignment(topic1Uuid, 3))); + // Topic 2 Partitions Assignment + // Since the new consumer isn't subscribed to topic 2 the assignment shouldn't change + expectedAssignment.get(consumerA).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 0, 1))); + expectedAssignment.get(consumerB).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 2))); + + assertAssignment(expectedAssignment, computedAssignment); + } + + @Test + public void testReassignmentWhenOneConsumerRemovedAfterInitialAssignmentWithTwoConsumersTwoTopics() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(3)); + + Map<String, AssignmentMemberSpec> members = new TreeMap<>(); + // Consumer A was removed + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic1Uuid, new HashSet<>(Collections.singletonList(2))); + currentAssignmentForB.put(topic2Uuid, new HashSet<>(Collections.singletonList(2))); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForB + )); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<String, Map<Uuid, Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + expectedAssignment.put(consumerB, mkAssignment(mkTopicAssignment(topic1Uuid, 0, 1, 2))); + // Topic 2 Partitions Assignment + expectedAssignment.get(consumerB).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 0, 1, 2))); + + assertAssignment(expectedAssignment, computedAssignment); + assertCoPartitionJoinProperty(computedAssignment); + } + + @Test + public void testReassignmentWhenMultipleSubscriptionsRemovedAfterInitialAssignmentWithThreeConsumersTwoTopics() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic3Uuid, new AssignmentTopicMetadata(2)); + + Map<String, AssignmentMemberSpec> members = new TreeMap<>(); + + // Let initial subscriptions be A -> T1, T2 // B -> T2 // C -> T2, T3 + // Change the subscriptions to A -> T1 // B -> T1, T2, T3 // C -> T2 + + Map<Uuid, Set<Integer>> currentAssignmentForA = new HashMap<>(); + currentAssignmentForA.put(topic1Uuid, new HashSet<>(Arrays.asList(0, 1, 2))); + currentAssignmentForA.put(topic2Uuid, Collections.singleton(0)); + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.singletonList(topic1Uuid), + currentAssignmentForA + )); + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic2Uuid, Collections.singleton(1)); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid, topic3Uuid), + currentAssignmentForB + )); + + Map<Uuid, Set<Integer>> currentAssignmentForC = new HashMap<>(); + currentAssignmentForC.put(topic2Uuid, Collections.singleton(2)); + currentAssignmentForC.put(topic3Uuid, new HashSet<>(Arrays.asList(0, 1))); + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.singletonList(topic2Uuid), + currentAssignmentForC + )); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<String, Map<Uuid, Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + expectedAssignment.put(consumerA, mkAssignment(mkTopicAssignment(topic1Uuid, 0, 1))); + expectedAssignment.put(consumerB, mkAssignment(mkTopicAssignment(topic1Uuid, 2))); + // Topic 2 Partitions Assignment + expectedAssignment.get(consumerB).putAll(mkAssignment(mkTopicAssignment(topic2Uuid, 0, 1))); + expectedAssignment.put(consumerC, mkAssignment(mkTopicAssignment(topic2Uuid, 2))); + // Topic 3 Partitions Assignment + expectedAssignment.get(consumerB).putAll(mkAssignment(mkTopicAssignment(topic3Uuid, 0, 1))); + + assertAssignment(expectedAssignment, computedAssignment); + } + + private void assertAssignment(Map<String, Map<Uuid, Set<Integer>>> expectedAssignment, GroupAssignment computedGroupAssignment) { + for (String memberId : computedGroupAssignment.members().keySet()) { + Map<Uuid, Set<Integer>> computedAssignmentForMember = computedGroupAssignment.members().get(memberId).targetPartitions(); + assertEquals(expectedAssignment.get(memberId), computedAssignmentForMember); + } + } + + private void assertCoPartitionJoinProperty(GroupAssignment groupAssignment) { Review Comment: we don't need it but we wanted separate property tests right? -- This is an automated message from the Apache Git Service. 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