aIbrahiim commented on issue #34739:
URL: https://github.com/apache/beam/issues/34739#issuecomment-4334301297

   I did an investigation to the last failures and I found out that failing 
jobs share the same error signature:
   
   - MLTest.test_ml_preprocessing_yaml fails.
   - Failed: Timeout (>600.0s) from pytest-timeout
   - apache_beam.utils.subprocess_server: Error bringing up service
   - repeated Waiting for grpc channel to be ready at localhost:<port>
   
   Passing/failing versions vary by run, but the core failure is the same test 
behavior (slow/hung service readiness), not different independent failures.
   
   So MLTest.test_ml_preprocessing_yaml is intermittently timing out while 
waiting for a local expansion/subprocess grpc service to become ready and under 
workflow load and newer Python versions, startup latency or readiness race 
conditions are causing the 600s timeout path


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