Hadoop QA generated comments based on patches submitted to JIRAs; for example:
There are some spurious -1's given to the patch. The patch only affects documentation, not source code, but Hadoop QA says that:
Evidently Hadoop QA is not able to recall the set of Findbugs warnings from the previous build.
(Of course the Findbugs warnings themselves should be addressed, but this patch could not have added to them).
This should be "160 warning messages", not "-160 warning messages".
Thanks to NKeywal for suggesting that the relevant file is dev-support/test-patch.sh.