eskabetxe commented on code in PR #2:
URL: 
https://github.com/apache/flink-connector-jdbc/pull/2#discussion_r1444672855


##########
flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/sink/writer/JdbcWriterStateSerializer.java:
##########
@@ -0,0 +1,76 @@
+package org.apache.flink.connector.jdbc.sink.writer;
+
+import org.apache.flink.annotation.Internal;
+import 
org.apache.flink.connector.jdbc.datasource.transactions.xa.domain.TransactionId;
+import org.apache.flink.core.io.SimpleVersionedSerializer;
+import org.apache.flink.core.memory.DataInputDeserializer;
+import org.apache.flink.core.memory.DataOutputSerializer;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/** {@link JdbcWriterState} serializer. */
+@Internal
+public class JdbcWriterStateSerializer implements 
SimpleVersionedSerializer<JdbcWriterState> {
+
+    private static final Logger LOG = 
LoggerFactory.getLogger(JdbcWriterStateSerializer.class);
+
+    @Override
+    public int getVersion() {
+        return 2;
+    }
+
+    @Override
+    public byte[] serialize(JdbcWriterState state) throws IOException {
+        final DataOutputSerializer out = new DataOutputSerializer(1);
+        out.writeInt(state.getHanging().size());
+        for (TransactionId tid : state.getHanging()) {
+            byte[] tIdBytes = tid.serialize();
+            out.writeByte(tIdBytes.length);
+            out.write(tIdBytes, 0, tIdBytes.length);
+        }
+        out.writeInt(state.getPrepared().size());
+        for (TransactionId tid : state.getPrepared()) {
+            byte[] tIdBytes = tid.serialize();
+            out.writeByte(tIdBytes.length);
+            out.write(tIdBytes, 0, tIdBytes.length);
+        }
+        return out.getSharedBuffer();
+    }
+
+    @Override
+    public JdbcWriterState deserialize(int version, byte[] serialized) throws 
IOException {
+        final DataInputDeserializer in = new DataInputDeserializer(serialized);
+
+        if (version == getVersion()) {
+            return deserializeV2(in);
+        }
+
+        LOG.error("Unknown version of state: " + version);

Review Comment:
   done



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