default void postUpdateMasterConfiguration(ObserverContext<MasterCoprocessorEnvironment> ctx,
    Configuration postReloadConf) throws IOException {
  }
Called after reloading the HMaster's {@link Configuration} from disk
@param ctx            the coprocessor instance's environment
@param postReloadConf the {@link Configuration} that was loaded
@throws IOException if you need to signal an IO error
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MasterObserver.java