[jira] [Created] (BEAM-13721) ZeroDivisionError if source bundle smaller than 1mb

["Inbar Dekel (Jira)" <ji...@apache.org>]

Inbar Dekel created BEAM-13721:
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             Summary: ZeroDivisionError if source bundle smaller than 1mb
                 Key: BEAM-13721
                 URL: https://issues.apache.org/jira/browse/BEAM-13721
             Project: Beam
          Issue Type: Bug
          Components: io-py-mongodb
    Affects Versions: 2.24.0
            Reporter: Inbar Dekel
            Assignee: Yichi Zhang


Hi,
I built a (GCP) DataFlow + apache-beam (version 2.24.0) pipeline, using python.
The pipeline's stages are:
1. reading from BigQuery
2. running a custom function (using the ParDo while passing it a class inheriting 'beam.DoFn'), that transforms the read data.
3. writing the transformed data to BigQuery
 
The pipeline works fine when stage 1 is querying a small amount of data, but when it is querying data from the last six months (lots of data), I am getting this error:
 
apache_beam.runners.dataflow.dataflow_runner.DataflowRuntimeException: Dataflow pipeline failed. State: FAILED, Error:
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/dataflow_worker/batchworker.py", line 649, in do_work
    work_executor.execute()
  File "/usr/local/lib/python3.7/site-packages/dataflow_worker/executor.py", line 179, in execute
    op.start()
  File "dataflow_worker/native_operations.py", line 38, in dataflow_worker.native_operations.NativeReadOperation.start
  File "dataflow_worker/native_operations.py", line 39, in dataflow_worker.native_operations.NativeReadOperation.start
  File "dataflow_worker/native_operations.py", line 44, in dataflow_worker.native_operations.NativeReadOperation.start
  File "dataflow_worker/native_operations.py", line 48, in dataflow_worker.native_operations.NativeReadOperation.start
  File "/usr/local/lib/python3.7/site-packages/dataflow_worker/workercustomsources.py", line 69, in __iter__
    self._source.start_position, self._source.stop_position)
  File "/usr/local/lib/python3.7/site-packages/apache_beam/io/concat_source.py", line 78, in get_range_tracker
    start_position, stop_position, self._source_bundles)
  File "/usr/local/lib/python3.7/site-packages/apache_beam/io/concat_source.py", line 131, in __init__
    self._compute_cumulative_weights(source_bundles[start[0]:last]) + [1] *
  File "/usr/local/lib/python3.7/site-packages/apache_beam/io/concat_source.py", line 154, in _compute_cumulative_weights
    running_total.append(max(min_diff, min(1, running_total[-1] + w / total)))
ZeroDivisionError: float division by zero
 
I saw this issue in your repository:
 
https://issues.apache.org/jira/browse/BEAM-10004
 
which is referencing the same problem I have, but even though this fix is already implemented in my version of apache-beam (2.24.0), I still get this error.
 
Can you please guide me in fixing this issue?
Is it something I am doing wrong or is this your bug?
 
Thank you in advance and have a good one!
 
Inbar Dekel



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