XiaoHongbo-Hope commented on code in PR #9375:
URL: https://github.com/apache/paimon/pull/9375#discussion_r3843628136


##########
paimon-python/pypaimon/write/writer/data_vector_writer.py:
##########
@@ -188,27 +188,32 @@ def _split_data(self, data: pa.RecordBatch) -> 
Tuple[pa.RecordBatch, pa.RecordBa
         return normal_data, vector_data
 
     def _should_roll_normal(self) -> bool:
-        if self.pending_normal_data is None:
+        # Runs on every write, so it answers from the running counts only.
+        if self._normal_buffer.is_empty:
             return False
-        if self.pending_normal_data.num_rows >= self.target_file_row_num:
+        if self._normal_buffer.num_rows >= self.target_file_row_num:
             return True
         if self.record_count % self.CHECK_ROLLING_RECORD_CNT != 0:
             return False
-        return self.pending_normal_data.nbytes > self.target_file_size
+        return self._normal_buffer.nbytes > self.target_file_size
 
     def _current_row_count(self) -> int:
-        if self.pending_normal_data is not None:
-            return self.pending_normal_data.num_rows
-        if self.vector_writer is not None and self.vector_writer.pending_data 
is not None:
-            return self.vector_writer.pending_data.num_rows
+        if not self._normal_buffer.is_empty:
+            return self._normal_buffer.num_rows
+        if self.vector_writer is not None:
+            # Running count, not a folded buffer: this runs on every write.
+            return self.vector_writer.pending_row_count
         return 0
 
     def _close_current_writers(self):
-        has_normal = self.pending_normal_data is not None and 
self.pending_normal_data.num_rows > 0
+        # Cleared at the end, once the normal file and the vector sidecars have
+        # both landed: a failure in either half has to leave the normal rows
+        # buffered, or a retry would commit sidecar-only metadata.
+        normal_data = self._normal_buffer.materialize()

Review Comment:
   Sidecar failure can duplicate normal data and break normal-sidecar 
consistency on retry. Please make the composite flush retry-safe.



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