jonvex commented on code in PR #13694:
URL: https://github.com/apache/hudi/pull/13694#discussion_r2269828301


##########
hudi-spark-datasource/hudi-spark-common/src/main/scala/org/apache/hudi/cdc/CDCFileGroupIterator.scala:
##########
@@ -516,17 +525,19 @@ class CDCFileGroupIterator(split: HoodieCDCFileGroupSplit,
       
.withBufferSize(HoodieMetadataConfig.MAX_READER_BUFFER_SIZE_PROP.defaultValue)
       .withPartition(partitionPath)
       .withMetaClient(metaClient)
-      .withRecordBuffer(recordBuffer)
+      .withRecordBuffer(keyBasedFileGroupRecordBuffer.get())
       .build
 
-    
CloseableIteratorListener.addListener(recordBuffer.getLogRecordIterator).asScala
+    
CloseableIteratorListener.addListener(keyBasedFileGroupRecordBuffer.get().getLogRecordIterator).asScala
   }
 
   /**
    * Convert InternalRow to json string.
    */
-  private def convertRowToJsonString(record: InternalRow): UTF8String = {
-    internalRowToJsonStringConverter.convert(record)
+  private def convertBufferedRecordToJsonString(record: 
BufferedRecord[InternalRow]): UTF8String = {
+    internalRowToJsonStringConverterMap.getOrElseUpdate(record.getSchemaId,
+      new 
InternalRowToJsonStringConverter(HoodieInternalRowUtils.getCachedSchema(readerContext.getRecordContext.decodeAvroSchema(record.getSchemaId))))

Review Comment:
   This passes:
   ```
     private var invokeCount: Int = 0
     private var myMap: mutable.Map[Int, InternalRowToJsonStringConverter] = 
new mutable.HashMap[Int, InternalRowToJsonStringConverter]
   
     def getSchema(x: Int): Schema = {
       invokeCount += x
       new Schema.Parser().parse(HoodieTestDataGenerator.TRIP_SCHEMA)
     }
   
     def getConverter(x: Int): InternalRowToJsonStringConverter = {
       myMap.getOrElseUpdate(x,
           new 
InternalRowToJsonStringConverter(HoodieInternalRowUtils.getCachedSchema(getSchema(x))))
     }
   
     test("Test by name param") {
       invokeCount = 0
       myMap = new mutable.HashMap[Int, InternalRowToJsonStringConverter]
       val converters = new mutable.ListBuffer[InternalRowToJsonStringConverter]
       for (i <- 0 to 5) {
         converters.append(getConverter(i))
       }
   
       for (i <- 0 to 5) {
         assertEquals(converters(i), getConverter(i))
       }
       assertEquals(15, invokeCount)
     }
   ```



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