YuriGusev commented on code in PR #1: URL: https://github.com/apache/flink-connector-dynamodb/pull/1#discussion_r997909454
########## 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: Hi, Duplicated keys only matter when they get to the same batch request, then dynamodb service will fail the request. I took a simple approach to have accumulator to deduplicate entries based on PK/SK in the same request. E.g. if we had 25 entries and 1 entry has duplicated PK/SK we would then write 24 entries in the request. But if two entries with the same PK/SK get to two different in-flight batch request this is not a problem as deduplication then happens on DynamoDB side. If order of the duplicate/update entries matters I think batch sink can not be used anyway, as the order is mixed up by partial/full retries and parallelism in the sink. Then it is up to user to dedup before the sink. I may be misunderstood the question. :) -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
