ahmedabu98 commented on code in PR #24979:
URL: https://github.com/apache/beam/pull/24979#discussion_r1253410733


##########
sdks/python/apache_beam/io/gcp/bigquery.py:
##########
@@ -1515,11 +1528,43 @@ def process(self, element, *schema_side_inputs):
 
     if not self.with_batched_input:
       row_and_insert_id = element[1]
+      row_byte_size = get_deep_size(row_and_insert_id)
+      # maintain buffer byte size for each destination
+      self._destination_buffer_byte_size.setdefault(destination, 0)
+      # send large rows that exceed BigQuery insert limits to DLQ
+      if row_byte_size >= self.max_insert_payload_size:
+        row_mb_size = row_byte_size / 1_000_000
+        max_mb_size = self.max_insert_payload_size / 1_000_000
+        error = (

Review Comment:
   I don't think it needs to? we are already preparing batches with the right 
size before sending them to `_flush_batch`



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