[HUDI-1720] Fix RealtimeCompactedRecordReader StackOverflowError (#2721)

hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/realtime/RealtimeCompactedRecordReader.java

@@ -77,6 +77,14 @@ class RealtimeCompactedRecordReader extends AbstractRealtimeRecordReader
         .build();
   }
 
+  private Option<GenericRecord> buildGenericRecordwithCustomPayload(HoodieRecord record) throws IOException {
+    if (usesCustomPayload) {
+      return record.getData().getInsertValue(getWriterSchema());
+    } else {
+      return record.getData().getInsertValue(getReaderSchema());
+    }
+  }
+
   @Override
   public boolean next(NullWritable aVoid, ArrayWritable arrayWritable) throws IOException {
     // Call the underlying parquetReader.next - which may replace the passed in ArrayWritable
@@ -95,15 +103,24 @@ class RealtimeCompactedRecordReader extends AbstractRealtimeRecordReader
         // TODO(NA): Invoke preCombine here by converting arrayWritable to Avro. This is required since the
         // deltaRecord may not be a full record and needs values of columns from the parquet
         Option<GenericRecord> rec;
-        if (usesCustomPayload) {
+        rec = buildGenericRecordwithCustomPayload(deltaRecordMap.get(key));
-          rec = deltaRecordMap.get(key).getData().getInsertValue(getWriterSchema());
+        // If the record is not present, this is a delete record using an empty payload so skip this base record
-        } else {
+        // and move to the next record
-          rec = deltaRecordMap.get(key).getData().getInsertValue(getReaderSchema());
+        while (!rec.isPresent()) {
+          // if current parquet reader has no record, return false
+          if (!this.parquetReader.next(aVoid, arrayWritable)) {
+            return false;
+          }
+          String tempKey = arrayWritable.get()[HoodieInputFormatUtils.HOODIE_RECORD_KEY_COL_POS].toString();
+          if (deltaRecordMap.containsKey(tempKey)) {
+            rec = buildGenericRecordwithCustomPayload(deltaRecordMap.get(tempKey));
+          } else {
+            // need to return true, since now log file does not contain tempKey, but parquet file contains tempKey
+            return true;
+          }
         }
         if (!rec.isPresent()) {
-          // If the record is not present, this is a delete record using an empty payload so skip this base record
+          return false;
-          // and move to the next record
-          return next(aVoid, arrayWritable);
         }
         GenericRecord recordToReturn = rec.get();
         if (usesCustomPayload) {