yihua commented on code in PR #13694:
URL: https://github.com/apache/hudi/pull/13694#discussion_r2268297362


##########
hudi-spark-datasource/hudi-spark-common/src/main/scala/org/apache/hudi/cdc/CDCFileGroupIterator.scala:
##########
@@ -489,24 +500,22 @@ class CDCFileGroupIterator(split: HoodieCDCFileGroupSplit,
       .withProps(readerProperties)
       .withLatestCommitTime(split.changes.last.getInstant)
       .build()
-    
CloseableIteratorListener.addListener(fileGroupReader.getClosableIterator).asScala
+    
CloseableIteratorListener.addListener(fileGroupReader.getClosableBufferedRecordIterator).asScala
   }
 
   private def loadLogFile(logFile: HoodieLogFile, instant: String): 
Iterator[BufferedRecord[InternalRow]] = {
     val partitionPath = 
FSUtils.getRelativePartitionPath(metaClient.getBasePath, 
logFile.getPath.getParent)
-    val readerContext = new 
SparkFileFormatInternalRowReaderContext(baseFileReader, Seq.empty, Seq.empty,
-      conf, metaClient.getTableConfig)
     readerContext.setLatestCommitTime(instant)
     readerContext.setHasBootstrapBaseFile(false)
     readerContext.setHasLogFiles(true)
-    readerContext.initRecordMerger(readerProperties)
     readerContext.setSchemaHandler(
       new FileGroupReaderSchemaHandler[InternalRow](readerContext, avroSchema, 
avroSchema,
         Option.empty(), metaClient.getTableConfig, readerProperties))
     val stats = new HoodieReadStats
-    val recordBuffer = new 
KeyBasedFileGroupRecordBuffer[InternalRow](readerContext, metaClient, 
readerContext.getMergeMode,
+    keyBasedFileGroupRecordBuffer.ifPresent(k => k.close())
+    keyBasedFileGroupRecordBuffer = Option.of(new 
KeyBasedFileGroupRecordBuffer[InternalRow](readerContext, metaClient, 
readerContext.getMergeMode,

Review Comment:
   What's the reason of reusing `keyBasedFileGroupRecordBuffer` variable here?



##########
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:
   @jonvex could you write a test or add breakpoints to validate that 
`InternalRowToJsonStringConverter` is constructed once per schema ID?



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