Github user zentol commented on the issue:
https://github.com/apache/flink/pull/4027
After looking into the remaining modules a bit i think we could safely
merge a full checkstyle commit for all modules but flink-runtime, contrary to
my previous comments in the JIRA. Core, java, optimizer and tests are actually
rather stale in terms of modifications; we primarily add things to them which
typically doesn't result in conflicts.
For runtime I'm currently thinking of applying the full checkstyle one
package at a time; there's way to many threads going on in there to globally
introduce most rules at once; although there are some exceptions like adding an
empty line before the package declaration.
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