YuriGusev commented on a change in pull request #18518:
URL: https://github.com/apache/flink/pull/18518#discussion_r841057538



##########
File path: 
flink-connectors/flink-connector-dynamodb/src/main/java/org/apache/flink/streaming/connectors/dynamodb/sink/TableRequestsContainer.java
##########
@@ -0,0 +1,67 @@
+/*
+ * 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.streaming.connectors.dynamodb.config.DynamoDbTablesConfig;
+import org.apache.flink.streaming.connectors.dynamodb.sink.key.PrimaryKey;
+
+import org.apache.flink.shaded.guava30.com.google.common.collect.ImmutableList;
+
+import software.amazon.awssdk.services.dynamodb.model.WriteRequest;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Container to accumulate requests in batches per table. De-duplicates batch 
request entities as
+ * per PrimaryKey definition. DynamoDB Batch API rejects the whole batch 
request if the request
+ * contains at least two items with identical hash and range keys (which 
essentially is two put
+ * operations).
+ */
+class TableRequestsContainer {
+
+    private final DynamoDbTablesConfig tablesConfig;
+    private final LinkedHashMap<String, Map<PrimaryKey, WriteRequest>> 
container;

Review comment:
       Yes, strange, probably got lost on previous re-base. It is fixed now.




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