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new 8eaa706e94 [flink] Bug fix for non-JSON deserialization in Flink CDC
(#6116)
8eaa706e94 is described below
commit 8eaa706e942d120eadad67cd242dee73c97f6922
Author: Arnav Balyan <[email protected]>
AuthorDate: Wed Aug 27 07:39:22 2025 +0530
[flink] Bug fix for non-JSON deserialization in Flink CDC (#6116)
---
.../KafkaDebeziumJsonDeserializationSchema.java | 7 ++-
...KafkaDebeziumJsonDeserializationSchemaTest.java | 58 ++++++++++++++++++++++
2 files changed, 64 insertions(+), 1 deletion(-)
diff --git
a/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/kafka/KafkaDebeziumJsonDeserializationSchema.java
b/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/kafka/KafkaDebeziumJsonDeserializationSchema.java
index a56608e3f7..887af5f606 100644
---
a/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/kafka/KafkaDebeziumJsonDeserializationSchema.java
+++
b/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/kafka/KafkaDebeziumJsonDeserializationSchema.java
@@ -67,7 +67,12 @@ public class KafkaDebeziumJsonDeserializationSchema
byte[] key = message.key();
JsonNode keyNode = null;
if (key != null && key.length > 0) {
- keyNode = objectMapper.readValue(key, JsonNode.class);
+ try {
+ keyNode = objectMapper.readValue(key, JsonNode.class);
+ } catch (Exception ignore) {
+ // If the key is not valid JSON, ignore it to avoid
failing deserialization.
+ // The CDC pipeline only relies on the JSON value payload.
+ }
}
JsonNode valueNode = objectMapper.readValue(message.value(),
JsonNode.class);
diff --git
a/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/kafka/KafkaDebeziumJsonDeserializationSchemaTest.java
b/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/kafka/KafkaDebeziumJsonDeserializationSchemaTest.java
new file mode 100644
index 0000000000..be29047ab3
--- /dev/null
+++
b/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/kafka/KafkaDebeziumJsonDeserializationSchemaTest.java
@@ -0,0 +1,58 @@
+/*
+ * 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.paimon.flink.action.cdc.kafka;
+
+import org.apache.paimon.flink.action.cdc.CdcSourceRecord;
+
+import
org.apache.paimon.shade.jackson2.com.fasterxml.jackson.databind.JsonNode;
+
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.nio.charset.StandardCharsets;
+
+/**
+ * Unit tests for {@link KafkaDebeziumJsonDeserializationSchema}. Ensures that
deserialization
+ * succeeds when Kafka keys are not valid JSON and verifies that the value
payload is still parsed
+ * correctly.
+ */
+public class KafkaDebeziumJsonDeserializationSchemaTest {
+
+ @Test
+ public void testDeserializeWithNonJsonKey() throws Exception {
+ KafkaDebeziumJsonDeserializationSchema schema =
+ new KafkaDebeziumJsonDeserializationSchema();
+
+ byte[] rawKey = "non-json-key".getBytes(StandardCharsets.UTF_8);
+ byte[] jsonValue =
"{\"after\":{\"id\":1},\"op\":\"c\"}".getBytes(StandardCharsets.UTF_8);
+
+ CdcSourceRecord record =
+ schema.deserialize(new ConsumerRecord<>("topic", 0, 0L,
rawKey, jsonValue));
+
+ Assertions.assertNotNull(record, "Deserialization should succeed and
return a record");
+ Assertions.assertNull(record.getKey(), "Key should be null when the
Kafka key is not JSON");
+
+ JsonNode valueNode = (JsonNode) record.getValue();
+ Assertions.assertEquals(
+ 1,
+ valueNode.get("after").get("id").asInt(),
+ "Value JSON should be parsed correctly");
+ }
+}
