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https://issues.apache.org/jira/browse/BEAM-12900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17483860#comment-17483860
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Beam JIRA Bot commented on BEAM-12900:
--------------------------------------
This issue was marked "stale-P2" and has not received a public comment in 14
days. It is now automatically moved to P3. If you are still affected by it, you
can comment and move it back to P2.
> 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
> Priority: P3
>
> 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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