Dmytro Sadovnychyi created BEAM-12900:
-----------------------------------------
Summary: Dataflow fails to materialize elements over 2GB
Key: BEAM-12900
URL: https://issues.apache.org/jira/browse/BEAM-12900
Project: Beam
Issue Type: Bug
Components: io-py-gcp, runner-dataflow, sdk-py-core
Affects Versions: 2.32.0
Reporter: Dmytro Sadovnychyi
In some cases when we have some big individual element (e.g. after a Combine)
and given a combination of side-inputs afterwards Dataflow might decide to
materialize PCollection into temporary storage (on GCS using avrofile with
simple "bytes" schema) – this process fails if our element is more than 2GB in
size.
Job ID: 2021-09-15_02_14_12-14362936082336076824
Stacktrace:
```
Error message from worker: Traceback (most recent call last): File
"/usr/local/lib/python3.7/site-packages/dataflow_worker/batchworker.py", line
651, in do_work work_executor.execute() File
"/usr/local/lib/python3.7/site-packages/dataflow_worker/executor.py", line 181,
in execute op.finish() File "dataflow_worker/native_operations.py", line 93, in
dataflow_worker.native_operations.NativeWriteOperation.finish File
"dataflow_worker/native_operations.py", line 94, in
dataflow_worker.native_operations.NativeWriteOperation.finish File
"dataflow_worker/native_operations.py", line 95, in
dataflow_worker.native_operations.NativeWriteOperation.finish File
"/usr/local/lib/python3.7/site-packages/dataflow_worker/nativeavroio.py", line
308, in __exit__ self._data_file_writer.flush() File "fastavro/_write.pyx",
line 664, in fastavro._write.Writer.flush File "fastavro/_write.pyx", line 639,
in fastavro._write.Writer.dump File "fastavro/_write.pyx", line 451, in
fastavro._write.snappy_write_block File "fastavro/_write.pyx", line 458, in
fastavro._write.snappy_write_block File
"/usr/local/lib/python3.7/site-packages/apache_beam/io/filesystemio.py", line
200, in write self._uploader.put(b) File
"/usr/local/lib/python3.7/site-packages/apache_beam/io/gcp/gcsio.py", line 720,
in put self._conn.send_bytes(data.tobytes()) File
"/usr/local/lib/python3.7/multiprocessing/connection.py", line 200, in
send_bytes self._send_bytes(m[offset:offset + size]) File
"/usr/local/lib/python3.7/multiprocessing/connection.py", line 393, in
_send_bytes header = struct.pack("!i", n) struct.error: 'i' format requires
-2147483648 <= number <= 2147483647
```
This can be solved via a Reshuffle which forces it to be materialized on a
shuffling service instead, which doesn't have this limitation.
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