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feat(loader): support kafka as datasource (#506)
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@@ -64,6 +64,7 @@ jobs: | |
| mvn test -P file | ||
| mvn test -P hdfs | ||
| mvn test -P jdbc | ||
| mvn test -P kafka | ||
| - name: Upload coverage to Codecov | ||
| uses: codecov/[email protected] | ||
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172 changes: 172 additions & 0 deletions
172
hugegraph-loader/src/main/java/org/apache/hugegraph/loader/reader/kafka/KafkaReader.java
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| @@ -0,0 +1,172 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.hugegraph.loader.reader.kafka; | ||
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| import java.time.Duration; | ||
| import java.util.ArrayDeque; | ||
| import java.util.Deque; | ||
| import java.util.Properties; | ||
| import java.util.Queue; | ||
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| import org.apache.hugegraph.loader.constant.Constants; | ||
| import org.apache.hugegraph.loader.exception.InitException; | ||
| import org.apache.hugegraph.loader.executor.LoadContext; | ||
| import org.apache.hugegraph.loader.mapping.InputStruct; | ||
| import org.apache.hugegraph.loader.parser.CsvLineParser; | ||
| import org.apache.hugegraph.loader.parser.JsonLineParser; | ||
| import org.apache.hugegraph.loader.parser.LineParser; | ||
| import org.apache.hugegraph.loader.parser.TextLineParser; | ||
| import org.apache.hugegraph.loader.reader.AbstractReader; | ||
| import org.apache.hugegraph.loader.reader.line.Line; | ||
| import org.apache.hugegraph.loader.source.file.FileFormat; | ||
| import org.apache.hugegraph.loader.source.kafka.KafkaSource; | ||
| import org.apache.hugegraph.util.Log; | ||
| import org.apache.kafka.clients.consumer.ConsumerRecord; | ||
| import org.apache.kafka.clients.consumer.ConsumerRecords; | ||
| import org.apache.kafka.clients.consumer.KafkaConsumer; | ||
| import org.apache.kafka.common.serialization.StringDeserializer; | ||
| import org.slf4j.Logger; | ||
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| import com.google.common.collect.ImmutableList; | ||
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| import lombok.SneakyThrows; | ||
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| public class KafkaReader extends AbstractReader { | ||
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| private static final Logger LOG = Log.logger(KafkaReader.class); | ||
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| private final KafkaSource source; | ||
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| private final LineParser parser; | ||
| private Queue<String> batch; | ||
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| private static final String BASE_CONSUMER_GROUP = "kafka-reader-base"; | ||
| private final KafkaConsumer dataConsumer; | ||
| private final boolean earlyStop; | ||
| private boolean emptyPoll; | ||
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| public KafkaReader(KafkaSource source) { | ||
| this.source = source; | ||
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| this.dataConsumer = createKafkaConsumer(); | ||
| this.parser = createLineParser(); | ||
| this.earlyStop = source.isEarlyStop(); | ||
| } | ||
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| @Override | ||
| public void init(LoadContext context, | ||
| InputStruct struct) throws InitException { | ||
| this.progress(context, struct); | ||
| } | ||
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| @Override | ||
| public void confirmOffset() { | ||
| // Do Nothing | ||
| } | ||
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| @Override | ||
| public void close() { | ||
| this.dataConsumer.close(); | ||
| } | ||
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| @Override | ||
| public boolean hasNext() { | ||
| return !this.earlyStop || !this.emptyPoll; | ||
| } | ||
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| @Override | ||
| public Line next() { | ||
| if (batch == null || batch.size() == 0) { | ||
| batch = nextBatch(); | ||
| } | ||
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| String rawValue = batch.poll(); | ||
| if (rawValue != null) { | ||
| return this.parser.parse(this.source.header(), rawValue); | ||
| } else { | ||
| this.emptyPoll = true; | ||
| } | ||
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| return null; | ||
| } | ||
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| private int getKafkaTopicPartitionCount() { | ||
| Properties props = new Properties(); | ||
| props.put("bootstrap.servers", this.source.getBootstrapServer()); | ||
| props.put("group.id", BASE_CONSUMER_GROUP); | ||
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| KafkaConsumer<?, ?> consumer = new KafkaConsumer<>(props); | ||
| int count = consumer.partitionsFor(this.source.getTopic()).size(); | ||
| consumer.close(); | ||
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| return count; | ||
| } | ||
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| private KafkaConsumer<String, String> createKafkaConsumer() { | ||
| Properties props = new Properties(); | ||
| props.put("bootstrap.servers", this.source.getBootstrapServer()); | ||
| props.put("max.poll.records", this.source.getBatchSize()); | ||
| props.put("group.id", this.source.getGroup()); | ||
| props.put("enable.auto.commit", Constants.KAFKA_AUTO_COMMIT); | ||
| props.put("auto.commit.interval.ms", String.valueOf(Constants.KAFKA_AUTO_COMMIT_INTERVAL)); | ||
| props.put("session.timeout.ms", String.valueOf(Constants.KAFKA_SESSION_TIMEOUT)); | ||
| if (this.source.isFromBeginning()) { | ||
| props.put("auto.offset.reset", Constants.KAFKA_EARLIEST_OFFSET); | ||
| } else { | ||
| props.put("auto.offset.reset", Constants.KAFKA_LATEST_OFFSET); | ||
| } | ||
| props.put("key.deserializer", StringDeserializer.class.getName()); | ||
| props.put("value.deserializer", StringDeserializer.class.getName()); | ||
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| KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props); | ||
| consumer.subscribe(ImmutableList.of(this.source.getTopic())); | ||
| return consumer; | ||
| } | ||
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| @SneakyThrows | ||
| private Deque<String> nextBatch() { | ||
| ConsumerRecords<String, String> records = | ||
| dataConsumer.poll(Duration.ofMillis(Constants.KAFKA_POLL_DURATION)); | ||
| Deque<String> queue = new ArrayDeque<>(records.count()); | ||
| if (records.count() == 0) { | ||
| Thread.sleep(Constants.KAFKA_POLL_GAP_INTERVAL); | ||
| } else { | ||
| for (ConsumerRecord<String, String> record : records) { | ||
| queue.add(record.value()); | ||
| } | ||
| } | ||
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| return queue; | ||
| } | ||
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| private LineParser createLineParser() { | ||
| FileFormat format = source.getFormat(); | ||
| switch (format) { | ||
| case CSV: | ||
| return new CsvLineParser(); | ||
| case TEXT: | ||
| return new TextLineParser(source.getDelimiter()); | ||
| case JSON: | ||
| return new JsonLineParser(); | ||
| default: | ||
| throw new AssertionError(String.format( | ||
| "Unsupported file format '%s' of source '%s'", | ||
| format, source)); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
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@@ -23,5 +23,7 @@ public enum SourceType { | |
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| HDFS, | ||
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| JDBC | ||
| JDBC, | ||
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| KAFKA | ||
| } | ||
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