Remove subprocess.PIPE usage by using a temp file

[chamikaramj]

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[codecov[bot]]

Codecov Report

Merging #22654 (5901176) into master (4799828) will decrease coverage by 0.01%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #22654      +/-   ##
==========================================
- Coverage   74.20%   74.18%   -0.02%     
==========================================
  Files         708      708              
  Lines       93465    93473       +8     
==========================================
- Hits        69352    69347       -5     
- Misses      22838    22851      +13     
  Partials     1275     1275              

Flag	Coverage Δ
python	83.59% <0.00%> (-0.02%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdks/python/apache_beam/utils/subprocess_server.py	56.54% <0.00%> (-2.20%)	:arrow_down:
.../python/apache_beam/testing/test_stream_service.py	88.09% <0.00%> (-4.77%)	:arrow_down:
...che_beam/runners/interactive/interactive_runner.py	90.06% <0.00%> (-1.33%)	:arrow_down:
sdks/python/apache_beam/internal/metrics/metric.py	93.00% <0.00%> (-1.00%)	:arrow_down:
...hon/apache_beam/runners/direct/test_stream_impl.py	93.28% <0.00%> (-0.75%)	:arrow_down:
sdks/python/apache_beam/transforms/combiners.py	93.05% <0.00%> (-0.39%)	:arrow_down:
...ks/python/apache_beam/runners/worker/sdk_worker.py	88.94% <0.00%> (-0.16%)	:arrow_down:
...on/apache_beam/runners/dataflow/dataflow_runner.py	82.87% <0.00%> (-0.14%)	:arrow_down:
...hon/apache_beam/runners/worker/bundle_processor.py	93.42% <0.00%> (-0.13%)	:arrow_down:
sdks/python/apache_beam/runners/direct/executor.py	97.01% <0.00%> (+0.54%)	:arrow_up:
... and 1 more

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[chamikaramj]

Run XVR_PythonUsingJava_Dataflow PostCommit

[chamikaramj]

Run XVR_Direct PostCommit

[chamikaramj]

@robertwb I think you had concerns about this change.

Do you think this should be reverted ?

[TheNeuralBit]

@robertwb I think you had concerns about this change.

Do you think this should be reverted ?

I'm curious what the concerns were. My understanding was that this was a net positive, orthogonal to the grpc issue.

[chamikaramj]

@TheNeuralBit I reverted it before the new release cut since new grpcio has been released and we haven't run into issues. I think @robertwb believed that PIPE is the correct construct to use here (instead of temp files) and we should not run into deadlocks due to the way we use PIPE. We can get it in again in the future if needed.