kafka OffsetSyncStore 源码
kafka OffsetSyncStore 代码
文件路径:/connect/mirror/src/main/java/org/apache/kafka/connect/mirror/OffsetSyncStore.java
/*
* 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.mirror;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.errors.WakeupException;
import org.apache.kafka.common.serialization.ByteArrayDeserializer;
import org.apache.kafka.common.utils.Utils;
import java.util.Map;
import java.util.HashMap;
import java.util.Collections;
import java.time.Duration;
import java.util.Optional;
import java.util.OptionalLong;
/** Used internally by MirrorMaker. Stores offset syncs and performs offset translation. */
class OffsetSyncStore implements AutoCloseable {
private final KafkaConsumer<byte[], byte[]> consumer;
private final Map<TopicPartition, OffsetSync> offsetSyncs = new HashMap<>();
private final TopicPartition offsetSyncTopicPartition;
OffsetSyncStore(MirrorConnectorConfig config) {
consumer = new KafkaConsumer<>(config.offsetSyncsTopicConsumerConfig(),
new ByteArrayDeserializer(), new ByteArrayDeserializer());
offsetSyncTopicPartition = new TopicPartition(config.offsetSyncsTopic(), 0);
consumer.assign(Collections.singleton(offsetSyncTopicPartition));
}
// for testing
OffsetSyncStore(KafkaConsumer<byte[], byte[]> consumer, TopicPartition offsetSyncTopicPartition) {
this.consumer = consumer;
this.offsetSyncTopicPartition = offsetSyncTopicPartition;
}
OptionalLong translateDownstream(TopicPartition sourceTopicPartition, long upstreamOffset) {
Optional<OffsetSync> offsetSync = latestOffsetSync(sourceTopicPartition);
if (offsetSync.isPresent()) {
if (offsetSync.get().upstreamOffset() > upstreamOffset) {
// Offset is too far in the past to translate accurately
return OptionalLong.of(-1L);
}
long upstreamStep = upstreamOffset - offsetSync.get().upstreamOffset();
return OptionalLong.of(offsetSync.get().downstreamOffset() + upstreamStep);
} else {
return OptionalLong.empty();
}
}
// poll and handle records
synchronized void update(Duration pollTimeout) {
try {
consumer.poll(pollTimeout).forEach(this::handleRecord);
} catch (WakeupException e) {
// swallow
}
}
public synchronized void close() {
consumer.wakeup();
Utils.closeQuietly(consumer, "offset sync store consumer");
}
protected void handleRecord(ConsumerRecord<byte[], byte[]> record) {
OffsetSync offsetSync = OffsetSync.deserializeRecord(record);
TopicPartition sourceTopicPartition = offsetSync.topicPartition();
offsetSyncs.put(sourceTopicPartition, offsetSync);
}
private Optional<OffsetSync> latestOffsetSync(TopicPartition topicPartition) {
return Optional.ofNullable(offsetSyncs.get(topicPartition));
}
}
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