Jiabao-Sun commented on code in PR #1: URL: https://github.com/apache/flink-connector-mongodb/pull/1#discussion_r1011340413
########## flink-connector-mongodb/src/main/java/org/apache/flink/connector/mongodb/sink/writer/MongoWriter.java: ########## @@ -0,0 +1,183 @@ +/* + * 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.flink.connector.mongodb.sink.writer; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.annotation.VisibleForTesting; +import org.apache.flink.api.common.functions.util.ListCollector; +import org.apache.flink.api.common.operators.MailboxExecutor; +import org.apache.flink.api.common.serialization.SerializationSchema; +import org.apache.flink.api.connector.sink2.Sink; +import org.apache.flink.api.connector.sink2.SinkWriter; +import org.apache.flink.connector.mongodb.common.config.MongoConnectionOptions; +import org.apache.flink.connector.mongodb.sink.config.MongoWriteOptions; +import org.apache.flink.connector.mongodb.sink.writer.context.MongoSinkContext; +import org.apache.flink.connector.mongodb.sink.writer.context.MongoSinkContextImpl; +import org.apache.flink.connector.mongodb.sink.writer.serializer.MongoSerializationSchema; +import org.apache.flink.metrics.groups.SinkWriterMetricGroup; +import org.apache.flink.runtime.operators.util.metrics.CountingCollector; +import org.apache.flink.util.Collector; +import org.apache.flink.util.FlinkRuntimeException; + +import com.mongodb.MongoException; +import com.mongodb.client.MongoClient; +import com.mongodb.client.MongoClients; +import com.mongodb.client.model.WriteModel; +import org.bson.BsonDocument; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.List; + +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** + * This class is responsible to write records in a MongoDB collection. + * + * @param <IN> The type of the input elements. + */ +@Internal +public class MongoWriter<IN> implements SinkWriter<IN> { + + private static final Logger LOG = LoggerFactory.getLogger(MongoWriter.class); + + private final MongoConnectionOptions connectionOptions; + private final MongoWriteOptions writeOptions; + private final MongoSerializationSchema<IN> serializationSchema; + private final MongoSinkContext sinkContext; + private final MailboxExecutor mailboxExecutor; + private final boolean flushOnCheckpoint; + private final List<WriteModel<BsonDocument>> bulkRequests = new ArrayList<>(); + private final Collector<WriteModel<BsonDocument>> collector; + private final MongoClient mongoClient; + + private boolean checkpointInProgress = false; + private volatile long lastSendTime = 0L; + private volatile long ackTime = Long.MAX_VALUE; + + public MongoWriter( + MongoConnectionOptions connectionOptions, + MongoWriteOptions writeOptions, + boolean flushOnCheckpoint, + Sink.InitContext initContext, + MongoSerializationSchema<IN> serializationSchema) { + this.connectionOptions = checkNotNull(connectionOptions); + this.writeOptions = checkNotNull(writeOptions); + this.serializationSchema = checkNotNull(serializationSchema); + this.flushOnCheckpoint = flushOnCheckpoint; + + checkNotNull(initContext); + this.mailboxExecutor = checkNotNull(initContext.getMailboxExecutor()); + + SinkWriterMetricGroup metricGroup = checkNotNull(initContext.metricGroup()); + metricGroup.setCurrentSendTimeGauge(() -> ackTime - lastSendTime); + + this.collector = + new CountingCollector<>( + new ListCollector<>(this.bulkRequests), + metricGroup.getNumRecordsSendCounter()); + + // Initialize the serialization schema. + this.sinkContext = new MongoSinkContextImpl(initContext, writeOptions); + try { + SerializationSchema.InitializationContext initializationContext = + initContext.asSerializationSchemaInitializationContext(); + serializationSchema.open(initializationContext, sinkContext, writeOptions); + } catch (Exception e) { + throw new FlinkRuntimeException("Failed to open the MongoEmitter", e); + } + + // Initialize the mongo client. + this.mongoClient = MongoClients.create(connectionOptions.getUri()); + } + + @Override + public void write(IN element, Context context) throws IOException, InterruptedException { + // do not allow new bulk writes until all actions are flushed + while (checkpointInProgress) { + mailboxExecutor.yield(); + } + collector.collect(serializationSchema.serialize(element, sinkContext)); + if (isOverMaxActionsLimit() || isOverMaxFlushIntervalLimit()) { + doBulkWrite(); + } + } + + @Override + public void flush(boolean endOfInput) throws IOException { + checkpointInProgress = true; + while (!bulkRequests.isEmpty() && (flushOnCheckpoint || endOfInput)) { + doBulkWrite(); + } + checkpointInProgress = false; + } + + @Override + public void close() { + if (mongoClient != null) { + mongoClient.close(); + } + } + + @VisibleForTesting + void doBulkWrite() throws IOException { + if (bulkRequests.isEmpty()) { + // no records to write + return; + } + + int maxRetryTimes = writeOptions.getMaxRetryTimes(); + for (int i = 0; i <= maxRetryTimes; i++) { + try { + lastSendTime = System.currentTimeMillis(); + mongoClient + .getDatabase(connectionOptions.getDatabase()) + .getCollection(connectionOptions.getCollection(), BsonDocument.class) + .bulkWrite(bulkRequests); + ackTime = System.currentTimeMillis(); + bulkRequests.clear(); + break; + } catch (MongoException e) { + LOG.error("Bulk Write to MongoDB failed, retry times = {}", i, e); + if (i >= maxRetryTimes) { + throw new IOException(e); + } + try { + Thread.sleep(1000L * i); Review Comment: Add the configuration `sink.retry.interval` and fixed the sleep time for the first attempt. -- This is an automated message from the Apache Git Service. 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