Github user alpinegizmo commented on the issue:
https://github.com/apache/flink/pull/3720
I prefer a conservative approach for as long as we still have to support
building the docs on Ruby 1.9, so I'd keep the number of updated gems as small
as possible.
As for adding support for Ruby 2.4, both docs/Gemfile and
docs/ruby2/Gemfile should be updated, along with their corresponding (and
derived) Gemfile.lock files. Moreover, the octokit downgrade is not needed.
I'm not sure what motivates some of the proposed gem upgrades. I was able
to get the docs to build on ruby 2.4 by making changing both Gemfiles as shown
below. This leaves the classifier-reborn, ffi, libv8, posix-spawn, rb-inotify,
redcarpet, and sass gems as they are rather than upgrading them. Do we need
newer versions of any of those?
-gem 'json'
+gem 'json', '2.0.4'
+gem 'yajl-ruby', '1.2.2'
+gem 'jekyll-coffeescript', '1.0.2'
With these upgrades, the build script still works for me on Ruby 1.9.3 and
2.3.3, as well as 2.4.0.
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