Ray: [ray] [bazel] build failure, error --experimental_ui_deduplicate unrecognized

[acxz]

What is the problem?

When trying to build ray from source I am getting the following output:

Error

```
Extracting Bazel installation...
Starting local Bazel server and connecting to it...
INFO: Reading rc options for 'build' from /home/acxz/vcs/git/github/acxz/pkgbuilds/python-ray/src/ray-ray-1.0.0/.bazelrc:
'build' options: --enable_platform_specific_config --action_env=PATH --compilation_mode=opt --experimental_ui_deduplicate --per_file_copt=.pb.cc$@-w --per_file_copt=-.(asm|S)$,external/.@-w --per_file_copt=-.(asm|S)$,external/com_github_grpc_grpc/.@-DGRPC_BAZEL_BUILD --http_timeout_scaling=5.0 --verbose_failures
ERROR: --experimental_ui_deduplicate :: Unrecognized option: --experimental_ui_deduplicate
Traceback (most recent call last):
File "setup.py", line 450, in
setuptools.setup(
File "/usr/lib/python3.8/site-packages/setuptools/__init__.py", line 153, in setup
return distutils.core.setup(*attrs)
File "/usr/lib/python3.8/distutils/core.py", line 148, in setup
dist.run_commands()
File "/usr/lib/python3.8/distutils/dist.py", line 966, in run_commands
self.run_command(cmd)
File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/usr/lib/python3.8/distutils/command/build.py", line 135, in run
self.run_command(cmd_name)
File "/usr/lib/python3.8/distutils/cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "setup.py", line 443, in run
return pip_run(self)
File "setup.py", line 352, in pip_run
build(True, BUILD_JAVA)
File "setup.py", line 309, in build
return bazel_invoke(
File "setup.py", line 195, in bazel_invoke
result = invoker([cmd] + cmdline, *args, *kwargs)
File "/usr/lib/python3.8/subprocess.py", line 364, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['bazel', 'build', '--verbose_failures', '--', '//:ray_pkg']' returned non-zero exit status 2.

```

Ray version and other system information (Python version, TensorFlow version, OS):
ray: 1.0.0
python: 3.8.5
gcc: 10.2.0
bazel: 3.5.0
os: Arch Linux

Reproduction (REQUIRED)

Please provide a script that can be run to reproduce the issue. The script should have no external library dependencies (i.e., use fake or mock data / environments):

If we cannot run your script, we cannot fix your issue.

• [ ] I have verified my script runs in a clean environment and reproduces the issue.
• [ ] I have verified the issue also occurs with the latest wheels.

The above does not apply since this is a build issue.

[acxz]

Related issues:
https://github.com/ray-project/ray/discussions/9308
https://github.com/ray-project/ray/issues/10774

[rkooo567]

I guess your bazel version is not correct? I am using bazel 3.2.0

[acxz]

Yep seems that in the later bazel releases --experimental_ui_deduplicate has been removed. Just made a PR to resolve it.

I would still consider this a bug.

[rkooo567]

We explicitly said the supported version of bazel is just 3.2.0 in our code (https://github.com/ray-project/ray/blob/ce96b03b07a4a4bdd851aa84493c616cd291aff2/python/setup.py#L31). We should probably improve our documentation or error handling, but I don't consider this a bug. Let me add a doc tag here.

[rkooo567]

Task: Specify a bazel veresion in our doc for development.

[acxz]

I see, in any case I dont think my PR hurts, if anything it allows Ray to build on later bazel versions as well which I am sure will eventually be needed.

[rkooo567]

Oh, I didn't realize you pushed a PR! Thanks for doing that!

One concern I have is that when people use 3.2.0, this flag will be on again. Do you know what the flag is exactly about?

cc @simon-mo @mehrdadn Did you guys know why we added this flag in the first place? It seems to be off by default in bazel >= 3.5

[rkooo567]

I'd love to merge the PR, but let me verify this is fine from people who are familiar with our bazel config! Thanks for the contribution again :)

[mehrdadn]

@rkooo567 I think I added it for cleaning up the Bazel output. But you can remove it. It seems to have been removed in https://github.com/bazelbuild/bazel/commit/a6935cd0857a2008f7957b663ba1c7364ee9c0dc

[rkooo567]

Awesome! @acxz we will merge the PR shortly. Thanks again for the contribution!