dlg99 commented on a change in pull request #9927: URL: https://github.com/apache/pulsar/pull/9927#discussion_r626098728
########## File path: pulsar-io/kafka-connect-adaptor/src/main/java/org/apache/pulsar/io/kafka/connect/KafkaConnectSink.java ########## @@ -0,0 +1,325 @@ +/** + * 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.pulsar.io.kafka.connect; + +import com.google.common.annotations.VisibleForTesting; +import com.google.common.base.Preconditions; +import com.google.common.collect.ImmutableMap; +import com.google.common.collect.Lists; +import com.google.common.collect.Maps; +import com.google.common.util.concurrent.ThreadFactoryBuilder; +import lombok.extern.slf4j.Slf4j; +import org.apache.kafka.clients.consumer.OffsetAndMetadata; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.record.TimestampType; +import org.apache.kafka.connect.connector.Task; +import org.apache.kafka.connect.data.Schema; +import org.apache.kafka.connect.sink.SinkConnector; +import org.apache.kafka.connect.sink.SinkRecord; +import org.apache.kafka.connect.sink.SinkTask; +import org.apache.pulsar.client.api.schema.GenericObject; +import org.apache.pulsar.client.impl.schema.KeyValueSchema; +import org.apache.pulsar.common.schema.SchemaType; +import org.apache.pulsar.functions.api.Record; +import org.apache.pulsar.io.core.KeyValue; +import org.apache.pulsar.io.core.Sink; +import org.apache.pulsar.io.core.SinkContext; + +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Properties; +import java.util.concurrent.ConcurrentLinkedDeque; +import java.util.concurrent.Executors; +import java.util.concurrent.ScheduledExecutorService; +import java.util.concurrent.TimeUnit; + +import static org.apache.pulsar.io.kafka.connect.PulsarKafkaWorkerConfig.OFFSET_STORAGE_TOPIC_CONFIG; +import static org.apache.pulsar.io.kafka.connect.PulsarKafkaWorkerConfig.PULSAR_SERVICE_URL_CONFIG; + +@Slf4j +public class KafkaConnectSink implements Sink<GenericObject> { + + private boolean unwrapKeyValueIfAvailable; + + private final static ImmutableMap<Class<?>, Schema> primitiveTypeToSchema; + private final static ImmutableMap<SchemaType, Schema> pulsarSchemaTypeTypeToKafkaSchema; + + static { + primitiveTypeToSchema = ImmutableMap.<Class<?>, Schema>builder() + .put(Boolean.class, Schema.BOOLEAN_SCHEMA) + .put(Byte.class, Schema.INT8_SCHEMA) + .put(Short.class, Schema.INT16_SCHEMA) + .put(Integer.class, Schema.INT32_SCHEMA) + .put(Long.class, Schema.INT64_SCHEMA) + .put(Float.class, Schema.FLOAT32_SCHEMA) + .put(Double.class, Schema.FLOAT64_SCHEMA) + .put(String.class, Schema.STRING_SCHEMA) + .put(byte[].class, Schema.BYTES_SCHEMA) + .build(); + pulsarSchemaTypeTypeToKafkaSchema = ImmutableMap.<SchemaType, Schema>builder() + .put(SchemaType.BOOLEAN, Schema.BOOLEAN_SCHEMA) + .put(SchemaType.INT8, Schema.INT8_SCHEMA) + .put(SchemaType.INT16, Schema.INT16_SCHEMA) + .put(SchemaType.INT32, Schema.INT32_SCHEMA) + .put(SchemaType.INT64, Schema.INT64_SCHEMA) + .put(SchemaType.FLOAT, Schema.FLOAT32_SCHEMA) + .put(SchemaType.DOUBLE, Schema.FLOAT64_SCHEMA) + .put(SchemaType.STRING, Schema.STRING_SCHEMA) + .put(SchemaType.BYTES, Schema.BYTES_SCHEMA) + .build(); + } + + private PulsarKafkaSinkContext sinkContext; + private PulsarKafkaSinkTaskContext taskContext; + private SinkConnector connector; + private SinkTask task; + + private int batchSize; + private long lingerMs; + private final ScheduledExecutorService scheduledExecutor = + Executors.newSingleThreadScheduledExecutor(new ThreadFactoryBuilder() + .setNameFormat("pulsar-io-kafka-adaptor-sink-flush-%d") + .build()); + private final ConcurrentLinkedDeque<Record<GenericObject>> pendingFlushQueue = new ConcurrentLinkedDeque<>(); + private volatile boolean isRunning = false; + + private final Properties props = new Properties(); + private PulsarKafkaConnectSinkConfig kafkaSinkConfig; + + protected String topicName; + + @Override + public void write(Record<GenericObject> sourceRecord) { + if (log.isDebugEnabled()) { + log.debug("Record sending to kafka, record={}.", sourceRecord); + } + + if (!isRunning) { + log.error("Sink is stopped. Cannot send the record {}", sourceRecord); + sourceRecord.fail(); + return; + } + + try { + SinkRecord record = toSinkRecord(sourceRecord); + task.put(Lists.newArrayList(record)); + } catch (Exception ex) { + log.error("Error sending the record {}", sourceRecord, ex); + sourceRecord.fail(); + return; + } + pendingFlushQueue.add(sourceRecord); + flushIfNeeded(false); + } + + @Override + public void close() throws Exception { + isRunning = false; + flushIfNeeded(true); + scheduledExecutor.shutdown(); + if (!scheduledExecutor.awaitTermination(10 * lingerMs, TimeUnit.MILLISECONDS)) { + log.error("scheduledExecutor did not terminate in {} ms", 10 * lingerMs); + } + + task.stop(); + connector.stop(); + taskContext.close(); + + log.info("Kafka sink stopped."); + } + + @Override + public void open(Map<String, Object> config, SinkContext ctx) throws Exception { + kafkaSinkConfig = PulsarKafkaConnectSinkConfig.load(config); + Objects.requireNonNull(kafkaSinkConfig.getTopic(), "Kafka topic is not set"); + topicName = kafkaSinkConfig.getTopic(); + unwrapKeyValueIfAvailable = kafkaSinkConfig.isUnwrapKeyValueIfAvailable(); + + String kafkaConnectorFQClassName = kafkaSinkConfig.getKafkaConnectorSinkClass(); + kafkaSinkConfig.getKafkaConnectorConfigProperties().forEach(props::put); + + Class<?> clazz = Class.forName(kafkaConnectorFQClassName); + connector = (SinkConnector) clazz.getConstructor().newInstance(); + + Class<? extends Task> taskClass = connector.taskClass(); + sinkContext = new PulsarKafkaSinkContext(); + connector.initialize(sinkContext); + connector.start(Maps.fromProperties(props)); + + List<Map<String, String>> configs = connector.taskConfigs(1); + Preconditions.checkNotNull(configs); + Preconditions.checkArgument(configs.size() == 1); + + configs.forEach(x -> { + x.put(OFFSET_STORAGE_TOPIC_CONFIG, kafkaSinkConfig.getOffsetStorageTopic()); + x.put(PULSAR_SERVICE_URL_CONFIG, kafkaSinkConfig.getPulsarServiceUrl()); + }); + task = (SinkTask) taskClass.getConstructor().newInstance(); + taskContext = + new PulsarKafkaSinkTaskContext(configs.get(0), ctx, task::open); + task.initialize(taskContext); + task.start(configs.get(0)); + + batchSize = kafkaSinkConfig.getBatchSize(); + lingerMs = kafkaSinkConfig.getLingerTimeMs(); + scheduledExecutor.scheduleAtFixedRate(() -> + this.flushIfNeeded(true), lingerMs, lingerMs, TimeUnit.MILLISECONDS); + + + isRunning = true; + log.info("Kafka sink started : {}.", props); + } + + private void flushIfNeeded(boolean force) { + if (force || pendingFlushQueue.stream().limit(batchSize).count() >= batchSize) { + scheduledExecutor.submit(this::flush); + } + } + + // flush always happens on the same thread + public void flush() { + if (log.isDebugEnabled()) { + log.debug("flush requested, pending: {}, batchSize: {}", + pendingFlushQueue.size(), batchSize); + } + + if (pendingFlushQueue.isEmpty()) { + return; + } + + final Record<GenericObject> lastNotFlushed = pendingFlushQueue.getLast(); + Map<TopicPartition, OffsetAndMetadata> currentOffsets = taskContext.currentOffsets(); + + try { + task.flush(currentOffsets); + taskContext.flushOffsets(currentOffsets); + ackUntil(lastNotFlushed, Record::ack); + } catch (Throwable t) { + log.error("error flushing pending records", t); + ackUntil(lastNotFlushed, Record::fail); + } + } + + private void ackUntil(Record<GenericObject> lastNotFlushed, java.util.function.Consumer<Record<GenericObject>> cb) { + while (!pendingFlushQueue.isEmpty()) { + Record<GenericObject> r = pendingFlushQueue.pollFirst(); + cb.accept(r); + if (r == lastNotFlushed) { + break; + } + } + } + + /** + * org.apache.kafka.connect.data.Schema for the object + * @param obj - Object to get schema of. + * @return org.apache.kafka.connect.data.Schema + */ + private static Schema getKafkaConnectSchemaForObject(Object obj) { + if (obj != null && primitiveTypeToSchema.containsKey(obj.getClass())) { + return primitiveTypeToSchema.get(obj.getClass()); + } + return null; + } + + public static Schema getKafkaConnectSchema(org.apache.pulsar.client.api.Schema pulsarSchema, Object obj) { + if (pulsarSchema != null && pulsarSchema.getSchemaInfo() != null + && pulsarSchemaTypeTypeToKafkaSchema.containsKey(pulsarSchema.getSchemaInfo().getType())) { + return pulsarSchemaTypeTypeToKafkaSchema.get(pulsarSchema.getSchemaInfo().getType()); + } + + Schema result = getKafkaConnectSchemaForObject(obj); + if (result == null) { + throw new IllegalStateException("Unsupported kafka schema for Pulsar Schema " + + (pulsarSchema == null || pulsarSchema.getSchemaInfo() == null + ? "null" + : pulsarSchema.getSchemaInfo().toString()) + + " object class " + + (obj == null ? "null" : obj.getClass().getCanonicalName())); + } + return result; + } + + + @SuppressWarnings("rawtypes") + private SinkRecord toSinkRecord(Record<GenericObject> sourceRecord) { + final int partition = sourceRecord.getPartitionIndex().orElse(0); + final String topic = sourceRecord.getTopicName().orElse(topicName); + final Object key; + final Object value; + final Schema keySchema; + final Schema valueSchema; + + // sourceRecord is never instanceof KVRecord + // https://github.com/apache/pulsar/pull/10113 + if (unwrapKeyValueIfAvailable && sourceRecord.getSchema() != null + && sourceRecord.getSchema().getSchemaInfo() != null + && sourceRecord.getSchema().getSchemaInfo().getType() == SchemaType.KEY_VALUE) { + KeyValueSchema kvSchema = (KeyValueSchema) sourceRecord.getSchema(); + KeyValue kv = (KeyValue) sourceRecord.getValue().getNativeObject(); + key = kv.getKey(); + value = kv.getValue(); + keySchema = getKafkaConnectSchema(kvSchema.getKeySchema(), key); + valueSchema = getKafkaConnectSchema(kvSchema.getValueSchema(), value); + } else { + key = sourceRecord.getKey().orElse(null); + value = sourceRecord.getValue().getNativeObject(); + keySchema = Schema.STRING_SCHEMA; Review comment: this code builds Kafka's SinkRecord. Kafka's SinkRecord expect STRING_SCHEMA with String object (i.e. https://github.com/confluentinc/kafka-connect-hdfs/blob/d140586c87275283a5265913b4130a3fa16fd81f/src/test/java/io/confluent/connect/hdfs/TestWithMiniDFSCluster.java#L184) I will handle `msg.hasBase64EncodedKey()` (bytes key) separately. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
