@Override
  protected boolean isMatchingRegionLocation(RegionStateNode rsn) {
    return super.isMatchingRegionLocation(rsn) || rsn.getRegionLocation() == null;
  }
The RegionStateNode will not have a location if a confirm of an OPEN fails. On fail, the
RegionStateNode regionLocation is set to null. This is 'looser' than the test done in the
superclass. The HBCKSCP has been scheduled by an operator via hbck2 probably at the behest of a
report of an 'Unknown Server' in the 'HBCK Report'. Let the operators operation succeed even in
case where the region location in the RegionStateNode is null.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/HBCKServerCrashProcedure.java