$ bin/push_to_asf.py -g gerrit-asf
INFO:root:Fetching from remote 'gerrit-asf'...
Branch 'asf-site': up to date
Branch 'branch-2.7.0': found on Apache but not in gerrit
Branch 'doc_prototype': found on Apache but not in gerrit
Branch 'hadoop-next': needs update
Cannot update branch 'hadoop-next' from gerrit:
Apache revision 75a857c0 is not an ancestor of gerrit revision 0449b5be
Something must have been committed to Apache and bypassed gerrit.
Manual intervention is required.