default void postModifyTable(final ObserverContext<MasterCoprocessorEnvironment> ctx,
    final TableName tableName, TableDescriptor oldDescriptor, TableDescriptor currentDescriptor)
    throws IOException {
  }
Called after the modifyTable operation has been requested. Called as part of modify table RPC
call.
@param ctx               the environment to interact with the framework and master
@param tableName         the name of the table
@param oldDescriptor     descriptor of table before modify operation happened
@param currentDescriptor current TableDescriptor of the table
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MasterObserver.java