Ben Sidhom created BEAM-3887:
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Summary: Python SDK harness retrieves element codes from gRPC
read/write nodes
Key: BEAM-3887
URL: https://issues.apache.org/jira/browse/BEAM-3887
Project: Beam
Issue Type: Sub-task
Components: sdk-py-core
Reporter: Ben Sidhom
Assignee: Ahmet Altay
The python harness does not correctly get coders from the gRPC read/write
transforms but rather from PCollection inputs/outputs. This prevents the
harness from correctly receiving/transmitting prefix-encoded elements (seen as
prefix-encoded byte arrays by the runner).
It should instead retrieve input and output coders from the gRPC nodes.
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