Relax protobuf lower bound to 3.20. (#15506)

This PR drops the lower bound of protobuf to 3.20, to make cuDF compatible with the versions used in Google Colab.

I tested this manually in Google Colab, which uses protobuf 3.20, and cuDF 24.02 seemed to work fine when reading ORC statistics (the only runtime feature in cuDF that needs protobuf). Note: cuDF 24.02 was built was a newer protobuf/protoc, version 4.x.

I will test this by forcing protobuf 3.20 in CI, and then revert those changes if tests pass.

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - Nick Becker (https://github.com/beckernick)
  - Ray Douglass (https://github.com/raydouglass)
  - Matthew Roeschke (https://github.com/mroeschke)

URL: #15506

conda/environments/all_cuda-118_arch-x86_64.yaml

@@ -68,7 +68,7 @@ dependencies:
 - pandoc
 - pip
 - pre-commit
-- protobuf>=4.21,<5
+- protobuf>=3.20,<5
 - ptxcompiler
 - pyarrow==14.0.2.*
 - pydata-sphinx-theme!=0.14.2

conda/environments/all_cuda-122_arch-x86_64.yaml

@@ -66,7 +66,7 @@ dependencies:
 - pandoc
 - pip
 - pre-commit
-- protobuf>=4.21,<5
+- protobuf>=3.20,<5
 - pyarrow==14.0.2.*
 - pydata-sphinx-theme!=0.14.2
 - pynvjitlink

conda/recipes/cudf/meta.yaml

@@ -78,7 +78,7 @@ requirements:
     {% endif %}
     - cuda-version ={{ cuda_version }}
   run:
-    - {{ pin_compatible('protobuf', min_pin='x.x', max_pin='x') }}
+    - protobuf >=3.20,<5.0a0
     - python
     - typing_extensions >=4.0.0
     - pandas >=2.0,<2.2.2dev0

dependencies.yaml

@@ -286,7 +286,7 @@ dependencies:
       - output_types: conda
         packages:
           - &rmm_conda rmm==24.6.*
-          - &protobuf protobuf>=4.21,<5
+          - &protobuf protobuf>=3.20,<5
           - pip
           - pip:
               - git+https://github.com/python-streamz/streamz.git@master

python/cudf/pyproject.toml

@@ -34,7 +34,7 @@ dependencies = [
     "nvtx>=0.2.1",
     "packaging",
     "pandas>=2.0,<2.2.2dev0",
-    "protobuf>=4.21,<5",
+    "protobuf>=3.20,<5",
     "ptxcompiler",
     "pyarrow>=14.0.1,<15.0.0a0",
     "rich",