nirtsruya commented on code in PR #1: URL: https://github.com/apache/flink-connector-dynamodb/pull/1#discussion_r996989759
########## flink-connector-aws-dynamodb/src/main/java/org/apache/flink/streaming/connectors/dynamodb/sink/DynamoDbSinkBuilder.java: ########## @@ -0,0 +1,134 @@ +/* + * 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.streaming.connectors.dynamodb.sink; + +import org.apache.flink.annotation.PublicEvolving; +import org.apache.flink.connector.base.sink.AsyncSinkBaseBuilder; +import org.apache.flink.connector.base.sink.writer.ElementConverter; +import org.apache.flink.streaming.connectors.dynamodb.config.DynamoDbTablesConfig; + +import java.util.Optional; +import java.util.Properties; + +/** + * Builder to construct {@link DynamoDbSink}. + * + * <p>The following example shows the minimum setup to create a {@link DynamoDbSink} that writes + * records into DynamoDb + * + * <pre>{@code + * private static class DummyDynamoDbRequestConverter implements DynamoDbRequestConverter<String> { + * + * @Override + * public DynamoDbRequest apply(String s) { + * final Map<String, DynamoDbAttributeValue> item = new HashMap<>(); + * item.put("your-key", DynamoDbAttributeValue.builder().s(s).build()); + * return DynamoDbRequest.builder() + * .tableName("your-table-name") + * .putRequest(DynamoDbPutRequest.builder().item(item).build()) + * .build(); + * } + * } + * DynamoDbSink<String> dynamoDbSink = DynamoDbSink.<String>builder() + * .setDynamoDbRequestConverter(new DummyDynamoDbRequestConverter()) + * .build(); + * }</pre> + * + * <p>If the following parameters are not set in this builder, the following defaults will be used: + * + * <ul> + * <li>{@code maxBatchSize} will be 25 + * <li>{@code maxInFlightRequests} will be 50 + * <li>{@code maxBufferedRequests} will be 10000 + * <li>{@code maxBatchSizeInBytes} will be 16 MB i.e. {@code 16 * 1000 * 1000} + * <li>{@code maxTimeInBufferMS} will be 5000ms + * <li>{@code maxRecordSizeInBytes} will be 400 KB i.e. {@code 400 * 1000 * 1000} + * <li>{@code failOnError} will be false + * <li>{@code dynamoDbTablesConfig} will be empty meaning no records deduplication will be + * performed by the sink + * </ul> + * + * @param <InputT> type of elements that should be persisted in the destination + */ +@PublicEvolving +public class DynamoDbSinkBuilder<InputT> + extends AsyncSinkBaseBuilder<InputT, DynamoDbWriteRequest, DynamoDbSinkBuilder<InputT>> { + + private static final int DEFAULT_MAX_BATCH_SIZE = 25; + private static final int DEFAULT_MAX_IN_FLIGHT_REQUESTS = 50; Review Comment: Very good point, I was thinking about it, I think we should definately add a comment about this. We need to be specific here, as if we are using parallelism, MAX_IN_FLIGHT_REQUESTS alone will not help and we need to ensure key and ordering from the source as well But in general, I think we should document that the sink has this "problem" Maybe in the future we can allow to use single PutItem requests and allow expressions as you mentioned in another comment -- 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. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
