[GitHub] [flink] wuchong commented on a change in pull request #10847: [FLINK-15578][connectors/jdbc] implement exactly once JDBC sink

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wuchong commented on a change in pull request #10847:
URL: https://github.com/apache/flink/pull/10847#discussion_r558178582



##########
File path: flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/xa/JdbcXaSinkFunction.java
##########
@@ -0,0 +1,367 @@
+/*
+ * 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.jdbc.xa;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.common.functions.AbstractRichFunction;
+import org.apache.flink.api.common.state.CheckpointListener;
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.connector.jdbc.JdbcExactlyOnceOptions;
+import org.apache.flink.connector.jdbc.JdbcExecutionOptions;
+import org.apache.flink.connector.jdbc.JdbcStatementBuilder;
+import org.apache.flink.connector.jdbc.internal.JdbcBatchingOutputFormat;
+import org.apache.flink.connector.jdbc.internal.executor.JdbcBatchStatementExecutor;
+import org.apache.flink.connector.jdbc.xa.XaFacade.EmptyXaTransactionException;
+import org.apache.flink.runtime.state.FunctionInitializationContext;
+import org.apache.flink.runtime.state.FunctionSnapshotContext;
+import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction;
+import org.apache.flink.streaming.api.functions.sink.SinkFunction;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.transaction.xa.Xid;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Deque;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Optional;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import static org.apache.flink.connector.jdbc.xa.JdbcXaSinkFunctionState.of;
+
+/**
+ * JDBC sink function that uses XA transactions to provide exactly once guarantees. That is, if a
+ * checkpoint succeeds then all records emitted during it are committed in the database, and rolled
+ * back otherwise.
+ *
+ * <p>Each parallel subtask has it's own transactions, independent from other subtasks. Therefore,
+ * consistency is only guaranteed within partitions.

Review comment:
       Ah, I see. 




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