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KAFKA-12254: Ensure MM2 creates topics with source topic configs #10217

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Merged
rajinisivaram merged 7 commits into from
Mar 1, 2021
Merged

KAFKA-12254: Ensure MM2 creates topics with source topic configs #10217

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KAFKA-12254: Ensure MM2 creates topics with source topic configs
dhruvilshah3 Feb 26, 2021
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minor style change
dhruvilshah3 Feb 26, 2021
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add comments
dhruvilshah3 Feb 26, 2021
db09806
describe configs with source topic names
dhruvilshah3 Feb 26, 2021
6bce266
cache source to remote topic mapping
dhruvilshah3 Feb 26, 2021
5b4925d
minor change
dhruvilshah3 Feb 26, 2021
79d2029
address review comment
dhruvilshah3 Feb 26, 2021
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38 changes: 31 additions & 7 deletions connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorSourceConnector.java
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Original file line number Diff line number Diff line change
Expand Up @@ -309,18 +309,37 @@ private void createOffsetSyncsTopic() {
// visible for testing
void computeAndCreateTopicPartitions()
throws InterruptedException, ExecutionException {
Map<String, Long> partitionCounts = knownSourceTopicPartitions.stream()
Map<String, Long> topicToParitionCount = knownSourceTopicPartitions.stream()
.collect(Collectors.groupingBy(TopicPartition::topic, Collectors.counting())).entrySet().stream()
.collect(Collectors.toMap(x -> formatRemoteTopic(x.getKey()), Entry::getValue));
Set<String> knownTargetTopics = toTopics(knownTargetTopicPartitions);
List<NewTopic> newTopics = partitionCounts.entrySet().stream()
.filter(x -> !knownTargetTopics.contains(x.getKey()))
.map(x -> new NewTopic(x.getKey(), x.getValue().intValue(), (short) replicationFactor))

// get the set of topics that are not present on the target
Set<String> topicsToCreate = topicToParitionCount.keySet().stream()
.filter(topic -> !knownTargetTopics.contains(topic))
.collect(Collectors.toSet());
if (topicsToCreate.isEmpty())
return;

// get corresponding topic configurations from the source
Map<String, Config> configs = describeTopicConfigs(topicsToCreate);
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// construct collections for new topics and partitions
List<NewTopic> newTopics = topicToParitionCount.entrySet().stream()
.filter(topicAndPartitionCount -> !knownTargetTopics.contains(topicAndPartitionCount.getKey()))
.map(topicAndPartitionCount -> {
String topicName = topicAndPartitionCount.getKey();
Map<String, String> topicConfigs = configToMap(configs.get(topicName));
return new NewTopic(topicName, topicAndPartitionCount.getValue().intValue(), (short) replicationFactor)
.configs(topicConfigs);
})
.collect(Collectors.toList());
Map<String, NewPartitions> newPartitions = partitionCounts.entrySet().stream()
Map<String, NewPartitions> newPartitions = topicToParitionCount.entrySet().stream()
.filter(x -> knownTargetTopics.contains(x.getKey()))
.collect(Collectors.toMap(Entry::getKey, x -> NewPartitions.increaseTo(x.getValue().intValue())));
createTopicPartitions(partitionCounts, newTopics, newPartitions);

// create topic partitions on target
createTopicPartitions(topicToParitionCount, newTopics, newPartitions);
}

// visible for testing
Expand Down Expand Up @@ -359,6 +378,11 @@ private static Collection<TopicDescription> describeTopics(AdminClient adminClie
return adminClient.describeTopics(topics).all().get().values();
}

static Map<String, String> configToMap(Config config) {
return config.entries().stream()
.collect(Collectors.toMap(ConfigEntry::name, ConfigEntry::value));
}

@SuppressWarnings("deprecation")
// use deprecated alterConfigs API for broker compatibility back to 0.11.0
private void updateTopicConfigs(Map<String, Config> topicConfigs)
Expand Down Expand Up @@ -390,7 +414,7 @@ private static Stream<TopicPartition> expandTopicDescription(TopicDescription de
.map(x -> new TopicPartition(topic, x.partition()));
}

private Map<String, Config> describeTopicConfigs(Set<String> topics)
Map<String, Config> describeTopicConfigs(Set<String> topics)
throws InterruptedException, ExecutionException {
Set<ConfigResource> resources = topics.stream()
.map(x -> new ConfigResource(ConfigResource.Type.TOPIC, x))
Expand Down
22 changes: 20 additions & 2 deletions connect/mirror/src/test/java/org/apache/kafka/connect/mirror/MirrorSourceConnectorTest.java
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Expand Up @@ -16,6 +16,7 @@
*/
package org.apache.kafka.connect.mirror;

import kafka.log.LogConfig;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.acl.AccessControlEntry;
import org.apache.kafka.common.acl.AclBinding;
Expand Down Expand Up @@ -183,9 +184,15 @@ public void testRefreshTopicPartitions() throws Exception {
connector.initialize(mock(ConnectorContext.class));
connector = spy(connector);

Config topicConfig = new Config(Arrays.asList(
new ConfigEntry(LogConfig.CleanupPolicyProp(), "compact"),
new ConfigEntry(LogConfig.SegmentBytesProp(), "100")));
Map<String, Config> configs = Collections.singletonMap("source.topic", topicConfig);

List<TopicPartition> sourceTopicPartitions = Collections.singletonList(new TopicPartition("topic", 0));
doReturn(sourceTopicPartitions).when(connector).findSourceTopicPartitions();
doReturn(Collections.emptyList()).when(connector).findTargetTopicPartitions();
doReturn(configs).when(connector).describeTopicConfigs(Collections.singleton("source.topic"));
doNothing().when(connector).createTopicPartitions(any(), any(), any());

connector.refreshTopicPartitions();
Expand All @@ -194,7 +201,12 @@ public void testRefreshTopicPartitions() throws Exception {

Map<String, Long> expectedPartitionCounts = new HashMap<>();
expectedPartitionCounts.put("source.topic", 1L);
List<NewTopic> expectedNewTopics = Arrays.asList(new NewTopic("source.topic", 1, (short) 0));
Map<String, String> configMap = MirrorSourceConnector.configToMap(topicConfig);
assertEquals(2, configMap.size());

List<NewTopic> expectedNewTopics = Arrays.asList(
new NewTopic("source.topic", 1, (short) 0)
.configs(configMap));

verify(connector, times(2)).computeAndCreateTopicPartitions();
verify(connector, times(2)).createTopicPartitions(
Expand All @@ -217,10 +229,17 @@ public void testRefreshTopicPartitionsTopicOnTargetFirst() throws Exception {
connector.initialize(mock(ConnectorContext.class));
connector = spy(connector);

Config topicConfig = new Config(Arrays.asList(
new ConfigEntry(LogConfig.CleanupPolicyProp(), "compact"),
new ConfigEntry(LogConfig.SegmentBytesProp(), "100")));
Map<String, Config> configs = Collections.singletonMap("source.topic", topicConfig);

List<TopicPartition> sourceTopicPartitions = Collections.emptyList();
List<TopicPartition> targetTopicPartitions = Collections.singletonList(new TopicPartition("source.topic", 0));
doReturn(sourceTopicPartitions).when(connector).findSourceTopicPartitions();
doReturn(targetTopicPartitions).when(connector).findTargetTopicPartitions();
doReturn(configs).when(connector).describeTopicConfigs(Collections.singleton("source.topic"));
doReturn(Collections.emptyMap()).when(connector).describeTopicConfigs(Collections.emptySet());
doNothing().when(connector).createTopicPartitions(any(), any(), any());

// partitions appearing on the target cluster should not cause reconfiguration
Expand All @@ -234,6 +253,5 @@ public void testRefreshTopicPartitionsTopicOnTargetFirst() throws Exception {
// when partitions are added to the source cluster, reconfiguration is triggered
connector.refreshTopicPartitions();
verify(connector, times(1)).computeAndCreateTopicPartitions();

}
}