@Override
    public Optional<MasterObserver> getMasterObserver() {
      return Optional.of(this);
    }
We were only clearing rows that had a hregioninfo column in hbase:meta. Mangled rows that were
missing the hregioninfo because of error were being left behind messing up any subsequent table
made with the same name. HBASE-12980
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestEnableTable.java