Pin serverless databricks-connect to MAJOR.MINOR, not bare major - #29
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A serverless environment's constraint list (protobuf, grpcio, pyarrow, etc.) is generated from a specific runtime snapshot, so it is only validated against the MAJOR.MINOR release series present at generation time. The previous bare-major pin (``~=18.0``, resolving ``>=18.0, <19``) allowed newer minor releases whose bundled pyspark protobuf stubs may be incompatible with the pinned runtime libraries. Concretely, ``databricks-connect~=18.0`` resolved to 18.3.4, whose pyspark pb2 files use a ``_globals`` pattern intended for protobuf 6.x's ``BuildTopDescriptorsAndMessages``. With the v5 constraint list's ``protobuf~=5.29.4`` (the runtime version), that method does not inject ``_globals``, so the ``if not _USE_C_DESCRIPTORS:`` branch raises ``NameError: name '_globals' is not defined``. Fix ``dbconnect_pin()`` to pin to MAJOR.MINOR.0 (``~=18.0.0``, resolving ``>=18.0.0, <18.1``) — matching what was generated for DBR environments all along — and regenerate the six serverless pyprojects. Co-authored-by: Isaac <no-reply@databricks.com>
rclarey
previously approved these changes
Aug 31, 2026
Update the expected value from ``~=17.0`` (the old bare-major pin) to ``~=17.3.0`` (MAJOR.MINOR.0) to match the corrected dbconnect_pin() and also fix the comment that still said ``~=MAJOR.0``. Co-authored-by: Isaac <no-reply@databricks.com>
rclarey
approved these changes
Aug 31, 2026
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Summary
dbconnect_pin()inenvgen.pywas producing bare-major pins (~=18.0) after PR Pin serverless databricks-connect by major (~=17.0, not ~=17.3.0) #15, allowing any version in the major series (e.g. 18.3.4).databricks-connect 18.3.4's bundled pyspark pb2 stubs use a_globalspattern requiring protobuf 6.x'sBuildTopDescriptorsAndMessages. With v5'sprotobuf~=5.29.4constraint, theif not _USE_C_DESCRIPTORS:branch raisesNameError: name '_globals' is not defined.MAJOR.MINOR.0(~=18.0.0→>=18.0.0, <18.1), matching how DBR environments have always been pinned, and regenerate all 6 serverless pyprojects.Test plan
uv syncon a default-python bundle resolves todatabricks-connect~=18.0.0(not 18.3.x)from databricks.connect import DatabricksSessionsucceeds after sync