sink: add debezium-avro protocol

pkg/config/sink.go

@@ -144,7 +144,8 @@ type SinkConfig struct {
 	DispatchRules []*DispatchRule `toml:"dispatchers" json:"dispatchers,omitempty"`
 
 	ColumnSelectors []*ColumnSelector `toml:"column-selectors" json:"column-selectors,omitempty"`
-	// SchemaRegistry is only available when the downstream is MQ using avro protocol.
+	// SchemaRegistry is only available when the downstream is MQ using avro protocol
+	// or debezium protocol with Confluent Avro encoding.
 	SchemaRegistry *string `toml:"schema-registry" json:"schema-registry,omitempty"`
 	// EncoderConcurrency is only available when the downstream is MQ.
 	EncoderConcurrency *int `toml:"encoder-concurrency" json:"encoder-concurrency,omitempty"`

pkg/sink/codec/builder.go

@@ -40,6 +40,9 @@ func NewEventEncoder(ctx context.Context, cfg *common.Config) (common.EventEncod
 	case config.ProtocolCanalJSON:
 		return canal.NewJSONRowEventEncoder(ctx, cfg)
 	case config.ProtocolDebezium:
+		if cfg.AvroConfluentSchemaRegistry != "" {
+			return debezium.NewAvroBatchEncoder(ctx, cfg, config.GetGlobalServerConfig().ClusterID)
+		}
 		return debezium.NewBatchEncoder(cfg, config.GetGlobalServerConfig().ClusterID), nil
 	case config.ProtocolSimple:
 		return simple.NewEncoder(ctx, cfg)

pkg/sink/codec/common/config.go

@@ -55,7 +55,8 @@ type Config struct {
 
 	OutputRowKey bool
 
-	// avro only
+	// avro only, except AvroConfluentSchemaRegistry is also used by debezium
+	// protocol when Confluent Avro encoding is enabled.
 	AvroConfluentSchemaRegistry    string
 	AvroDecimalHandlingMode        string
 	AvroBigintUnsignedHandlingMode string
@@ -410,6 +411,13 @@ func (c *Config) Validate() error {
 		}
 	}
 
+	if c.Protocol == config.ProtocolDebezium && c.AvroGlueSchemaRegistry != nil {
+		return errors.ErrCodecInvalidConfig.GenWithStack(
+			`Debezium protocol only supports "%s" for Confluent Avro Schema Registry`,
+			codecOPTAvroSchemaRegistry,
+		)
+	}
+
 	if c.MaxMessageBytes <= 0 {
 		return errors.ErrCodecInvalidConfig.Wrap(
 			errors.Errorf("invalid max-message-bytes %d", c.MaxMessageBytes),

pkg/sink/codec/common/config_test.go

@@ -0,0 +1,33 @@
+// Copyright 2026 PingCAP, Inc.
+//
+// Licensed 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,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package common
+
+import (
+	"testing"
+
+	"github.com/pingcap/ticdc/pkg/config"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDebeziumSchemaRegistryConfig(t *testing.T) {
+	t.Parallel()
+
+	cfg := NewConfig(config.ProtocolDebezium)
+	cfg.AvroConfluentSchemaRegistry = "http://127.0.0.1:8081"
+	require.NoError(t, cfg.Validate())
+
+	cfg = NewConfig(config.ProtocolDebezium)
+	cfg.AvroGlueSchemaRegistry = &config.GlueSchemaRegistryConfig{}
+	require.ErrorContains(t, cfg.Validate(), `Debezium protocol only supports "schema-registry"`)
+}