tvalentyn commented on code in PR #30639:
URL: https://github.com/apache/beam/pull/30639#discussion_r1525603715
##########
sdks/python/apache_beam/runners/worker/data_plane.py:
##########
@@ -147,6 +148,10 @@ def maybe_flush(self):
def flush(self):
# type: () -> None
if self._flush_callback:
+ if self.size() > _FLUSH_MAX_SIZE:
+ raise ValueError(
+ f'Buffer size {self.size()} exceeds GRPC limit {_FLUSH_MAX_SIZE}. '
+ 'This is likely due to a single element that is too large.')
Review Comment:
```suggestion
'This is likely due to a single element that is too large. '
'To mitigate, store large elements in external storage systems, '
'and use PCollections to pass their metadata, '
'or use a custom coder that reduces the element's size.')
```
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