[FLINK-36128][cdc-runtime] Fix potential unrecoverable in-flight data exception by promoting LENIENT as the default schema change behavior

This closes #3574.

flink-cdc-cli/src/main/java/org/apache/flink/cdc/cli/parser/YamlPipelineDefinitionParser.java

@@ -19,6 +19,8 @@ package org.apache.flink.cdc.cli.parser;
 
 import org.apache.flink.cdc.common.configuration.Configuration;
 import org.apache.flink.cdc.common.event.SchemaChangeEventType;
+import org.apache.flink.cdc.common.event.SchemaChangeEventTypeFamily;
+import org.apache.flink.cdc.common.pipeline.SchemaChangeBehavior;
 import org.apache.flink.cdc.common.utils.StringUtils;
 import org.apache.flink.cdc.composer.definition.PipelineDef;
 import org.apache.flink.cdc.composer.definition.RouteDef;
@@ -35,11 +37,14 @@ import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.dataformat.yaml.YA
 
 import java.nio.file.Path;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
+import java.util.stream.Stream;
 
+import static org.apache.flink.cdc.common.pipeline.PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR;
 import static org.apache.flink.cdc.common.utils.ChangeEventUtils.resolveSchemaEvolutionOptions;
 import static org.apache.flink.cdc.common.utils.Preconditions.checkNotNull;
 
@@ -99,6 +104,19 @@ public class YamlPipelineDefinitionParser implements PipelineDefinitionParser {
 
     private PipelineDef parse(JsonNode pipelineDefJsonNode, Configuration globalPipelineConfig)
             throws Exception {
+
+        // UDFs are optional. We parse UDF first and remove it from the pipelineDefJsonNode since
+        // it's not of plain data types and must be removed before calling toPipelineConfig.
+        List<UdfDef> udfDefs = new ArrayList<>();
+        Optional.ofNullable(((ObjectNode) pipelineDefJsonNode.get(PIPELINE_KEY)).remove(UDF_KEY))
+                .ifPresent(node -> node.forEach(udf -> udfDefs.add(toUdfDef(udf))));
+
+        // Pipeline configs are optional
+        Configuration userPipelineConfig = toPipelineConfig(pipelineDefJsonNode.get(PIPELINE_KEY));
+
+        SchemaChangeBehavior schemaChangeBehavior =
+                userPipelineConfig.get(PIPELINE_SCHEMA_CHANGE_BEHAVIOR);
+
         // Source is required
         SourceDef sourceDef =
                 toSourceDef(
@@ -113,7 +131,8 @@ public class YamlPipelineDefinitionParser implements PipelineDefinitionParser {
                         checkNotNull(
                                 pipelineDefJsonNode.get(SINK_KEY),
                                 "Missing required field \"%s\" in pipeline definition",
-                                SINK_KEY));
+                                SINK_KEY),
+                        schemaChangeBehavior);
 
         // Transforms are optional
         List<TransformDef> transformDefs = new ArrayList<>();
@@ -128,14 +147,6 @@ public class YamlPipelineDefinitionParser implements PipelineDefinitionParser {
         Optional.ofNullable(pipelineDefJsonNode.get(ROUTE_KEY))
                 .ifPresent(node -> node.forEach(route -> routeDefs.add(toRouteDef(route))));
 
-        // UDFs are optional
-        List<UdfDef> udfDefs = new ArrayList<>();
-        Optional.ofNullable(((ObjectNode) pipelineDefJsonNode.get(PIPELINE_KEY)).remove(UDF_KEY))
-                .ifPresent(node -> node.forEach(udf -> udfDefs.add(toUdfDef(udf))));
-
-        // Pipeline configs are optional
-        Configuration userPipelineConfig = toPipelineConfig(pipelineDefJsonNode.get(PIPELINE_KEY));
-
         // Merge user config into global config
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.addAll(globalPipelineConfig);
@@ -162,7 +173,7 @@ public class YamlPipelineDefinitionParser implements PipelineDefinitionParser {
         return new SourceDef(type, name, Configuration.fromMap(sourceMap));
     }
 
-    private SinkDef toSinkDef(JsonNode sinkNode) {
+    private SinkDef toSinkDef(JsonNode sinkNode, SchemaChangeBehavior schemaChangeBehavior) {
         List<String> includedSETypes = new ArrayList<>();
         List<String> excludedSETypes = new ArrayList<>();
 
@@ -172,6 +183,23 @@ public class YamlPipelineDefinitionParser implements PipelineDefinitionParser {
         Optional.ofNullable(sinkNode.get(EXCLUDE_SCHEMA_EVOLUTION_TYPES))
                 .ifPresent(e -> e.forEach(tag -> excludedSETypes.add(tag.asText())));
 
+        if (includedSETypes.isEmpty()) {
+            // If no schema evolution types are specified, include all schema evolution types by
+            // default.
+            Arrays.stream(SchemaChangeEventTypeFamily.ALL)
+                    .map(SchemaChangeEventType::getTag)
+                    .forEach(includedSETypes::add);
+        }
+
+        if (excludedSETypes.isEmpty()
+                && SchemaChangeBehavior.LENIENT.equals(schemaChangeBehavior)) {
+            // In lenient mode, we exclude DROP_TABLE and TRUNCATE_TABLE by default. This could be
+            // overridden by manually specifying excluded types.
+            Stream.of(SchemaChangeEventType.DROP_TABLE, SchemaChangeEventType.TRUNCATE_TABLE)
+                    .map(SchemaChangeEventType::getTag)
+                    .forEach(excludedSETypes::add);
+        }
+
         Set<SchemaChangeEventType> declaredSETypes =
                 resolveSchemaEvolutionOptions(includedSETypes, excludedSETypes);
 

flink-cdc-cli/src/test/java/org/apache/flink/cdc/cli/parser/YamlPipelineDefinitionParserTest.java

@@ -27,6 +27,7 @@ import org.apache.flink.cdc.composer.definition.TransformDef;
 import org.apache.flink.cdc.composer.definition.UdfDef;
 
 import org.apache.flink.shaded.guava31.com.google.common.collect.ImmutableMap;
+import org.apache.flink.shaded.guava31.com.google.common.collect.ImmutableSet;
 import org.apache.flink.shaded.guava31.com.google.common.io.Resources;
 
 import org.junit.jupiter.api.Test;
@@ -37,6 +38,11 @@ import java.time.Duration;
 import java.util.Arrays;
 import java.util.Collections;
 
+import static org.apache.flink.cdc.common.event.SchemaChangeEventType.ADD_COLUMN;
+import static org.apache.flink.cdc.common.event.SchemaChangeEventType.ALTER_COLUMN_TYPE;
+import static org.apache.flink.cdc.common.event.SchemaChangeEventType.CREATE_TABLE;
+import static org.apache.flink.cdc.common.event.SchemaChangeEventType.DROP_COLUMN;
+import static org.apache.flink.cdc.common.event.SchemaChangeEventType.RENAME_COLUMN;
 import static org.apache.flink.cdc.common.pipeline.PipelineOptions.PIPELINE_LOCAL_TIME_ZONE;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;
@@ -384,7 +390,13 @@ class YamlPipelineDefinitionParserTest {
                             Configuration.fromMap(
                                     ImmutableMap.<String, String>builder()
                                             .put("bootstrap-servers", "localhost:9092")
-                                            .build())),
+                                            .build()),
+                            ImmutableSet.of(
+                                    DROP_COLUMN,
+                                    ALTER_COLUMN_TYPE,
+                                    ADD_COLUMN,
+                                    CREATE_TABLE,
+                                    RENAME_COLUMN)),
                     Collections.singletonList(
                             new RouteDef(
                                     "mydb.default.app_order_.*",
@@ -401,7 +413,16 @@ class YamlPipelineDefinitionParserTest {
     private final PipelineDef minimizedDef =
             new PipelineDef(
                     new SourceDef("mysql", null, new Configuration()),
-                    new SinkDef("kafka", null, new Configuration()),
+                    new SinkDef(
+                            "kafka",
+                            null,
+                            new Configuration(),
+                            ImmutableSet.of(
+                                    DROP_COLUMN,
+                                    ALTER_COLUMN_TYPE,
+                                    ADD_COLUMN,
+                                    CREATE_TABLE,
+                                    RENAME_COLUMN)),
                     Collections.emptyList(),
                     Collections.emptyList(),
                     Collections.emptyList(),
@@ -474,7 +495,16 @@ class YamlPipelineDefinitionParserTest {
     private final PipelineDef pipelineDefWithUdf =
             new PipelineDef(
                     new SourceDef("values", null, new Configuration()),
-                    new SinkDef("values", null, new Configuration()),
+                    new SinkDef(
+                            "values",
+                            null,
+                            new Configuration(),
+                            ImmutableSet.of(
+                                    DROP_COLUMN,
+                                    ALTER_COLUMN_TYPE,
+                                    ADD_COLUMN,
+                                    CREATE_TABLE,
+                                    RENAME_COLUMN)),
                     Collections.emptyList(),
                     Collections.singletonList(
                             new TransformDef(

flink-cdc-common/src/main/java/org/apache/flink/cdc/common/event/SchemaChangeEventType.java

@@ -22,13 +22,23 @@ import org.apache.flink.cdc.common.annotation.PublicEvolving;
 /** An enumeration of schema change event types for {@link SchemaChangeEvent}. */
 @PublicEvolving
 public enum SchemaChangeEventType {
-    ADD_COLUMN,
+    ADD_COLUMN("add.column"),
-    ALTER_COLUMN_TYPE,
+    ALTER_COLUMN_TYPE("alter.column.type"),
-    CREATE_TABLE,
+    CREATE_TABLE("create.table"),
-    DROP_COLUMN,
+    DROP_COLUMN("drop.column"),
-    DROP_TABLE,
+    DROP_TABLE("drop.table"),
-    RENAME_COLUMN,
+    RENAME_COLUMN("rename.column"),
-    TRUNCATE_TABLE;
+    TRUNCATE_TABLE("truncate.table");
+
+    private final String tag;
+
+    SchemaChangeEventType(String tag) {
+        this.tag = tag;
+    }
+
+    public String getTag() {
+        return tag;
+    }
 
     public static SchemaChangeEventType ofEvent(SchemaChangeEvent event) {
         if (event instanceof AddColumnEvent) {

flink-cdc-common/src/main/java/org/apache/flink/cdc/common/pipeline/PipelineOptions.java

@@ -48,7 +48,7 @@ public class PipelineOptions {
     public static final ConfigOption<SchemaChangeBehavior> PIPELINE_SCHEMA_CHANGE_BEHAVIOR =
             ConfigOptions.key("schema.change.behavior")
                     .enumType(SchemaChangeBehavior.class)
-                    .defaultValue(SchemaChangeBehavior.EVOLVE)
+                    .defaultValue(SchemaChangeBehavior.LENIENT)
                     .withDescription(
                             Description.builder()
                                     .text("Behavior for handling schema change events. ")

flink-cdc-common/src/main/java/org/apache/flink/cdc/common/utils/ChangeEventUtils.java

@@ -90,13 +90,9 @@ public class ChangeEventUtils {
             List<String> includedSchemaEvolutionTypes, List<String> excludedSchemaEvolutionTypes) {
         List<SchemaChangeEventType> resultTypes = new ArrayList<>();
 
-        if (includedSchemaEvolutionTypes.isEmpty()) {
-            resultTypes.addAll(Arrays.asList(SchemaChangeEventTypeFamily.ALL));
-        } else {
         for (String includeTag : includedSchemaEvolutionTypes) {
             resultTypes.addAll(resolveSchemaEvolutionTag(includeTag));
         }
-        }
 
         for (String excludeTag : excludedSchemaEvolutionTypes) {
             resultTypes.removeAll(resolveSchemaEvolutionTag(excludeTag));

flink-cdc-common/src/test/java/org/apache/flink/cdc/common/utils/ChangeEventUtilsTest.java

@@ -17,11 +17,16 @@
 
 package org.apache.flink.cdc.common.utils;
 
+import org.apache.flink.cdc.common.event.SchemaChangeEventType;
+import org.apache.flink.cdc.common.event.SchemaChangeEventTypeFamily;
+
 import org.assertj.core.util.Sets;
 import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
 
 import static org.apache.flink.cdc.common.event.SchemaChangeEventType.ADD_COLUMN;
 import static org.apache.flink.cdc.common.event.SchemaChangeEventType.ALTER_COLUMN_TYPE;
@@ -36,9 +41,12 @@ import static org.apache.flink.cdc.common.testutils.assertions.EventAssertions.a
 public class ChangeEventUtilsTest {
     @Test
     public void testResolveSchemaEvolutionOptions() {
-        assertThat(
+
-                        ChangeEventUtils.resolveSchemaEvolutionOptions(
+        List<String> allTags =
-                                Collections.emptyList(), Collections.emptyList()))
+                Arrays.stream(SchemaChangeEventTypeFamily.ALL)
+                        .map(SchemaChangeEventType::getTag)
+                        .collect(Collectors.toList());
+        assertThat(ChangeEventUtils.resolveSchemaEvolutionOptions(allTags, Collections.emptyList()))
                 .isEqualTo(
                         Sets.set(
                                 TRUNCATE_TABLE,
@@ -51,7 +59,7 @@ public class ChangeEventUtilsTest {
 
         assertThat(
                         ChangeEventUtils.resolveSchemaEvolutionOptions(
-                                Collections.emptyList(), Collections.singletonList("drop")))
+                                allTags, Collections.singletonList("drop")))
                 .isEqualTo(
                         Sets.set(
                                 ADD_COLUMN,
@@ -73,7 +81,7 @@ public class ChangeEventUtilsTest {
 
         assertThat(
                         ChangeEventUtils.resolveSchemaEvolutionOptions(
-                                Collections.emptyList(), Collections.singletonList("drop.column")))
+                                allTags, Collections.singletonList("drop.column")))
                 .isEqualTo(
                         Sets.set(
                                 ADD_COLUMN,

flink-cdc-composer/src/test/java/org/apache/flink/cdc/composer/flink/FlinkPipelineComposerITCase.java

@@ -26,6 +26,7 @@ import org.apache.flink.cdc.common.event.Event;
 import org.apache.flink.cdc.common.event.RenameColumnEvent;
 import org.apache.flink.cdc.common.event.TableId;
 import org.apache.flink.cdc.common.pipeline.PipelineOptions;
+import org.apache.flink.cdc.common.pipeline.SchemaChangeBehavior;
 import org.apache.flink.cdc.common.schema.Column;
 import org.apache.flink.cdc.common.schema.Schema;
 import org.apache.flink.cdc.common.types.DataType;
@@ -134,6 +135,8 @@ class FlinkPipelineComposerITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -191,6 +194,8 @@ class FlinkPipelineComposerITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -313,6 +318,8 @@ class FlinkPipelineComposerITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -373,6 +380,8 @@ class FlinkPipelineComposerITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -441,6 +450,8 @@ class FlinkPipelineComposerITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -496,6 +507,8 @@ class FlinkPipelineComposerITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -569,6 +582,8 @@ class FlinkPipelineComposerITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -766,6 +781,8 @@ class FlinkPipelineComposerITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -972,6 +989,8 @@ class FlinkPipelineComposerITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -1035,6 +1054,8 @@ class FlinkPipelineComposerITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,

flink-cdc-composer/src/test/java/org/apache/flink/cdc/composer/flink/FlinkPipelineTransformITCase.java

@@ -29,6 +29,7 @@ import org.apache.flink.cdc.common.event.Event;
 import org.apache.flink.cdc.common.event.RenameColumnEvent;
 import org.apache.flink.cdc.common.event.TableId;
 import org.apache.flink.cdc.common.pipeline.PipelineOptions;
+import org.apache.flink.cdc.common.pipeline.SchemaChangeBehavior;
 import org.apache.flink.cdc.common.schema.Column;
 import org.apache.flink.cdc.common.schema.Schema;
 import org.apache.flink.cdc.common.types.DataType;
@@ -213,6 +214,8 @@ class FlinkPipelineTransformITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         pipelineConfig.set(PipelineOptions.PIPELINE_LOCAL_TIME_ZONE, "America/Los_Angeles");
         PipelineDef pipelineDef =
                 new PipelineDef(
@@ -266,6 +269,8 @@ class FlinkPipelineTransformITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -350,6 +355,8 @@ class FlinkPipelineTransformITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -436,6 +443,8 @@ class FlinkPipelineTransformITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -516,6 +525,8 @@ class FlinkPipelineTransformITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -608,6 +619,8 @@ class FlinkPipelineTransformITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,

flink-cdc-composer/src/test/java/org/apache/flink/cdc/composer/flink/FlinkPipelineUdfITCase.java

@@ -19,6 +19,7 @@ package org.apache.flink.cdc.composer.flink;
 
 import org.apache.flink.cdc.common.configuration.Configuration;
 import org.apache.flink.cdc.common.pipeline.PipelineOptions;
+import org.apache.flink.cdc.common.pipeline.SchemaChangeBehavior;
 import org.apache.flink.cdc.composer.PipelineExecution;
 import org.apache.flink.cdc.composer.definition.PipelineDef;
 import org.apache.flink.cdc.composer.definition.SinkDef;
@@ -139,6 +140,8 @@ public class FlinkPipelineUdfITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -207,6 +210,8 @@ public class FlinkPipelineUdfITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -273,6 +278,8 @@ public class FlinkPipelineUdfITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -341,6 +348,8 @@ public class FlinkPipelineUdfITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -411,6 +420,8 @@ public class FlinkPipelineUdfITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -472,6 +483,8 @@ public class FlinkPipelineUdfITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -565,6 +578,8 @@ public class FlinkPipelineUdfITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -632,6 +647,8 @@ public class FlinkPipelineUdfITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -697,6 +714,8 @@ public class FlinkPipelineUdfITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,
@@ -758,6 +777,8 @@ public class FlinkPipelineUdfITCase {
         // Setup pipeline
         Configuration pipelineConfig = new Configuration();
         pipelineConfig.set(PipelineOptions.PIPELINE_PARALLELISM, 1);
+        pipelineConfig.set(
+                PipelineOptions.PIPELINE_SCHEMA_CHANGE_BEHAVIOR, SchemaChangeBehavior.EVOLVE);
         PipelineDef pipelineDef =
                 new PipelineDef(
                         sourceDef,

flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/src/test/java/org/apache/flink/cdc/pipeline/tests/MysqlE2eITCase.java

@@ -210,7 +210,8 @@ public class MysqlE2eITCase extends PipelineTestEnvironment {
                                 + "  type: values\n"
                                 + "\n"
                                 + "pipeline:\n"
-                                + "  parallelism: %d",
+                                + "  parallelism: %d\n"
+                                + "  schema.change.behavior: evolve",
                         INTER_CONTAINER_MYSQL_ALIAS,
                         MYSQL_TEST_USER,
                         MYSQL_TEST_PASSWORD,

flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/src/test/java/org/apache/flink/cdc/pipeline/tests/SchemaEvolveE2eITCase.java

@@ -190,7 +190,6 @@ public class SchemaEvolveE2eITCase extends PipelineTestEnvironment {
                         "AddColumnEvent{tableId=%s.members, addedColumns=[ColumnWithPosition{column=`precise_age` DOUBLE, position=LAST, existedColumnName=null}]}",
                         "AddColumnEvent{tableId=%s.members, addedColumns=[ColumnWithPosition{column=`biological_sex` TINYINT, position=LAST, existedColumnName=null}]}",
                         "DataChangeEvent{tableId=%s.members, before=[], after=[1013, Fiona, null, null, 16.0, null], op=INSERT, meta=()}",
-                        "TruncateTableEvent{tableId=%s.members}",
                         "DataChangeEvent{tableId=%s.members, before=[], after=[1014, Gem, null, null, 17.0, null], op=INSERT, meta=()}"));
 
         assertNotExists(

flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/src/test/java/org/apache/flink/cdc/pipeline/tests/SchemaEvolvingTransformE2eITCase.java

@@ -189,7 +189,6 @@ public class SchemaEvolvingTransformE2eITCase extends PipelineTestEnvironment {
                         "AlterColumnTypeEvent{tableId=%s.members, typeMapping={age=DOUBLE}, oldTypeMapping={age=INT}}",
                         "AddColumnEvent{tableId=%s.members, addedColumns=[ColumnWithPosition{column=`biological_sex` TINYINT, position=LAST, existedColumnName=null}]}",
                         "DataChangeEvent{tableId=%s.members, before=[], after=[1013 -> Fiona, 1013, Fiona, 16.0, 1026169, age < 20, null, null], op=INSERT, meta=()}",
-                        "TruncateTableEvent{tableId=%s.members}",
                         "DataChangeEvent{tableId=%s.members, before=[], after=[1014 -> Gem, 1014, Gem, 17.0, 1028196, age < 20, null, null], op=INSERT, meta=()}"));
     }
 
@@ -233,11 +232,12 @@ public class SchemaEvolvingTransformE2eITCase extends PipelineTestEnvironment {
                                 + "\n"
                                 + "pipeline:\n"
                                 + "  schema.change.behavior: unexpected\n"
-                                + "  parallelism: 1",
+                                + "  parallelism: %d",
                         INTER_CONTAINER_MYSQL_ALIAS,
                         MYSQL_TEST_USER,
                         MYSQL_TEST_PASSWORD,
-                        schemaEvolveDatabase.getDatabaseName());
+                        schemaEvolveDatabase.getDatabaseName(),
+                        parallelism);
         Path mysqlCdcJar = TestUtils.getResource("mysql-cdc-pipeline-connector.jar");
         Path valuesCdcJar = TestUtils.getResource("values-cdc-pipeline-connector.jar");
         Path mysqlDriverJar = TestUtils.getResource("mysql-driver.jar");
@@ -310,7 +310,7 @@ public class SchemaEvolvingTransformE2eITCase extends PipelineTestEnvironment {
                                 + "\n"
                                 + "pipeline:\n"
                                 + "  schema.change.behavior: %s\n"
-                                + "  parallelism: 1",
+                                + "  parallelism: %d",
                         INTER_CONTAINER_MYSQL_ALIAS,
                         MYSQL_TEST_USER,
                         MYSQL_TEST_PASSWORD,
@@ -318,7 +318,8 @@ public class SchemaEvolvingTransformE2eITCase extends PipelineTestEnvironment {
                         mergeTable ? "(members|new_members)" : "members",
                         dbName,
                         dbName,
-                        behavior);
+                        behavior,
+                        parallelism);
         Path mysqlCdcJar = TestUtils.getResource("mysql-cdc-pipeline-connector.jar");
         Path valuesCdcJar = TestUtils.getResource("values-cdc-pipeline-connector.jar");
         Path mysqlDriverJar = TestUtils.getResource("mysql-driver.jar");

flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/src/test/java/org/apache/flink/cdc/pipeline/tests/TransformE2eITCase.java

@@ -738,12 +738,14 @@ public class TransformE2eITCase extends PipelineTestEnvironment {
                                 + "    projection: ID, 'id -> ' || ID AS UID, PRICEALPHA AS PRICE\n"
                                 + "    filter: ID > 1008\n"
                                 + "pipeline:\n"
-                                + "  parallelism: 1",
+                                + "  parallelism: %d\n"
+                                + "  schema.change.behavior: evolve",
                         INTER_CONTAINER_MYSQL_ALIAS,
                         MYSQL_TEST_USER,
                         MYSQL_TEST_PASSWORD,
                         transformTestDatabase.getDatabaseName(),
-                        transformTestDatabase.getDatabaseName());
+                        transformTestDatabase.getDatabaseName(),
+                        parallelism);
         Path mysqlCdcJar = TestUtils.getResource("mysql-cdc-pipeline-connector.jar");
         Path valuesCdcJar = TestUtils.getResource("values-cdc-pipeline-connector.jar");
         Path mysqlDriverJar = TestUtils.getResource("mysql-driver.jar");
@@ -835,12 +837,14 @@ public class TransformE2eITCase extends PipelineTestEnvironment {
                                 + "    projection: \\*, 'id -> ' || ID AS UID\n"
                                 + "    filter: ID > 1008\n"
                                 + "pipeline:\n"
-                                + "  parallelism: 1",
+                                + "  parallelism: %d\n"
+                                + "  schema.change.behavior: evolve",
                         INTER_CONTAINER_MYSQL_ALIAS,
                         MYSQL_TEST_USER,
                         MYSQL_TEST_PASSWORD,
                         transformTestDatabase.getDatabaseName(),
-                        transformTestDatabase.getDatabaseName());
+                        transformTestDatabase.getDatabaseName(),
+                        parallelism);
         Path mysqlCdcJar = TestUtils.getResource("mysql-cdc-pipeline-connector.jar");
         Path valuesCdcJar = TestUtils.getResource("values-cdc-pipeline-connector.jar");
         Path mysqlDriverJar = TestUtils.getResource("mysql-driver.jar");
@@ -940,12 +944,14 @@ public class TransformE2eITCase extends PipelineTestEnvironment {
                                 + "    projection: ID || ' <- id' AS UID, *\n"
                                 + "    filter: ID > 1008\n"
                                 + "pipeline:\n"
-                                + "  parallelism: 1",
+                                + "  parallelism: %d\n"
+                                + "  schema.change.behavior: evolve",
                         INTER_CONTAINER_MYSQL_ALIAS,
                         MYSQL_TEST_USER,
                         MYSQL_TEST_PASSWORD,
                         transformTestDatabase.getDatabaseName(),
-                        transformTestDatabase.getDatabaseName());
+                        transformTestDatabase.getDatabaseName(),
+                        parallelism);
         Path mysqlCdcJar = TestUtils.getResource("mysql-cdc-pipeline-connector.jar");
         Path valuesCdcJar = TestUtils.getResource("values-cdc-pipeline-connector.jar");
         Path mysqlDriverJar = TestUtils.getResource("mysql-driver.jar");

flink-cdc-runtime/src/main/java/org/apache/flink/cdc/runtime/operators/schema/coordinator/SchemaRegistryRequestHandler.java

@@ -403,10 +403,6 @@ public class SchemaRegistryRequestHandler implements Closeable {
                     }
                     return events;
                 }
-            case DROP_TABLE:
-                // We don't drop any tables in Lenient mode.
-                LOG.info("A drop table event {} has been ignored in Lenient mode.", event);
-                return Collections.emptyList();
             default:
                 return Collections.singletonList(event);
         }

flink-cdc-runtime/src/main/java/org/apache/flink/cdc/runtime/partitioning/PrePartitionOperator.java

@@ -28,6 +28,7 @@ import org.apache.flink.cdc.common.function.HashFunctionProvider;
 import org.apache.flink.cdc.common.schema.Schema;
 import org.apache.flink.cdc.runtime.operators.schema.SchemaOperator;
 import org.apache.flink.cdc.runtime.operators.sink.SchemaEvolutionClient;
+import org.apache.flink.cdc.runtime.serializer.event.EventSerializer;
 import org.apache.flink.runtime.jobgraph.OperatorID;
 import org.apache.flink.runtime.jobgraph.tasks.TaskOperatorEventGateway;
 import org.apache.flink.streaming.api.operators.AbstractStreamOperator;
@@ -108,7 +109,10 @@ public class PrePartitionOperator extends AbstractStreamOperator<PartitioningEve
 
     private void broadcastEvent(Event toBroadcast) {
         for (int i = 0; i < downstreamParallelism; i++) {
-            output.collect(new StreamRecord<>(new PartitioningEvent(toBroadcast, i)));
+            // Deep-copying each event is required since downstream subTasks might run in the same
+            // JVM
+            Event copiedEvent = EventSerializer.INSTANCE.copy(toBroadcast);
+            output.collect(new StreamRecord<>(new PartitioningEvent(copiedEvent, i)));
         }
     }