YuriGusev commented on code in PR #1: URL: https://github.com/apache/flink-connector-dynamodb/pull/1#discussion_r1012407031
########## flink-connector-dynamodb/src/main/java/org/apache/flink/streaming/connectors/dynamodb/sink/DynamoDbSink.java: ########## @@ -0,0 +1,163 @@ +/* + * 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.Internal; +import org.apache.flink.annotation.PublicEvolving; +import org.apache.flink.connector.base.sink.AsyncSinkBase; +import org.apache.flink.connector.base.sink.writer.BufferedRequestState; +import org.apache.flink.connector.base.sink.writer.ElementConverter; +import org.apache.flink.core.io.SimpleVersionedSerializer; + +import java.io.IOException; +import java.util.Collection; +import java.util.Collections; +import java.util.List; +import java.util.Properties; + +import static org.apache.flink.util.Preconditions.checkArgument; +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** + * A DynamoDB Sink that performs async requests against a destination table using the buffering + * protocol specified in {@link AsyncSinkBase}. + * + * <p>The sink internally uses a {@link + * software.amazon.awssdk.services.dynamodb.DynamoDbAsyncClient} to communicate with the AWS + * endpoint. + * + * <p>The behaviour of the buffering may be specified by providing configuration during the sink + * build time. + * + * <ul> + * <li>{@code maxBatchSize}: the maximum size of a batch of entries that may be written to + * DynamoDb. DynamoDB client supports only up to 25 elements in the batch. + * <li>{@code maxInFlightRequests}: the maximum number of in flight requests that may exist, if + * any more in flight requests need to be initiated once the maximum has been reached, then it + * will be blocked until some have completed + * <li>{@code maxBufferedRequests}: the maximum number of elements held in the buffer, requests to + * sink will backpressure while the number of elements in the buffer is at the maximum + * <li>{@code maxBatchSizeInBytes}: the maximum size of a batch of entries that may be written to + * DynamoDb measured in bytes + * <li>{@code maxTimeInBufferMS}: the maximum amount of time an entry is allowed to live in the + * buffer, if any element reaches this age, the entire buffer will be flushed immediately + * <li>{@code maxRecordSizeInBytes}: the maximum size of a record the sink will accept into the + * buffer, a record of size larger than this will be rejected when passed to the sink + * <li>{@code failOnError}: when an exception is encountered while persisting to DynamoDb, the job + * will fail immediately if failOnError is set + * <li>{@code dynamoDbTablesConfig}: if provided for the table, the DynamoDb sink will attempt to + * deduplicate records with the same primary and/or secondary keys in the same batch request. + * Only the latest record with the same combination of key attributes is preserved in the + * request. + * </ul> Review Comment: Fixed and other javadocs also updated -- 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]
