| /* |
| * 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.hudi.utilities.sources; |
| |
| import org.apache.hudi.common.config.TypedProperties; |
| import org.apache.hudi.common.util.Option; |
| import org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamerMetrics; |
| import org.apache.hudi.utilities.schema.SchemaProvider; |
| import org.apache.hudi.utilities.sources.helpers.KafkaOffsetGen; |
| import org.apache.hudi.utilities.sources.helpers.KafkaOffsetGen.CheckpointUtils; |
| |
| import org.apache.kafka.common.serialization.StringDeserializer; |
| import org.apache.log4j.LogManager; |
| import org.apache.log4j.Logger; |
| import org.apache.spark.api.java.JavaRDD; |
| import org.apache.spark.api.java.JavaSparkContext; |
| import org.apache.spark.sql.SparkSession; |
| import org.apache.spark.streaming.kafka010.KafkaUtils; |
| import org.apache.spark.streaming.kafka010.LocationStrategies; |
| import org.apache.spark.streaming.kafka010.OffsetRange; |
| |
| /** |
| * Read json kafka data. |
| */ |
| public class JsonKafkaSource extends JsonSource { |
| |
| private static final Logger LOG = LogManager.getLogger(JsonKafkaSource.class); |
| |
| private final KafkaOffsetGen offsetGen; |
| |
| private final HoodieDeltaStreamerMetrics metrics; |
| |
| public JsonKafkaSource(TypedProperties properties, JavaSparkContext sparkContext, SparkSession sparkSession, |
| SchemaProvider schemaProvider, HoodieDeltaStreamerMetrics metrics) { |
| super(properties, sparkContext, sparkSession, schemaProvider); |
| this.metrics = metrics; |
| properties.put("key.deserializer", StringDeserializer.class); |
| properties.put("value.deserializer", StringDeserializer.class); |
| offsetGen = new KafkaOffsetGen(properties); |
| } |
| |
| @Override |
| protected InputBatch<JavaRDD<String>> fetchNewData(Option<String> lastCheckpointStr, long sourceLimit) { |
| OffsetRange[] offsetRanges = offsetGen.getNextOffsetRanges(lastCheckpointStr, sourceLimit, metrics); |
| long totalNewMsgs = CheckpointUtils.totalNewMessages(offsetRanges); |
| LOG.info("About to read " + totalNewMsgs + " from Kafka for topic :" + offsetGen.getTopicName()); |
| if (totalNewMsgs <= 0) { |
| return new InputBatch<>(Option.empty(), CheckpointUtils.offsetsToStr(offsetRanges)); |
| } |
| JavaRDD<String> newDataRDD = toRDD(offsetRanges); |
| return new InputBatch<>(Option.of(newDataRDD), CheckpointUtils.offsetsToStr(offsetRanges)); |
| } |
| |
| private JavaRDD<String> toRDD(OffsetRange[] offsetRanges) { |
| return KafkaUtils.createRDD(sparkContext, offsetGen.getKafkaParams(), offsetRanges, |
| LocationStrategies.PreferConsistent()).map(x -> (String) x.value()); |
| } |
| } |