@Override
  public ZKWatcher getWatcher() {
    return watcher;
  }
Get the full znode path for the node used by the coordinator or member to trigger an abort of
the global barrier acquisition or execution in subprocedures.
@param controller     controller running the procedure
@param opInstanceName name of the running procedure instance (not the procedure description).
@return full znode path to the abort znode
hbase-server/src/main/java/org/apache/hadoop/hbase/procedure/ZKProcedureUtil.java