private static void debugLogMutation(Mutation p) throws IOException {
    METALOG.debug("{} {}", p.getClass().getSimpleName(), p.toJSON());
  }
Pull the region state from a catalog table {@link Result}.
@return the region state, or null if unknown.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionStateStore.java