@Override
      public void call(MasterObserver observer) throws IOException {
        observer.postModifyTableStoreFileTracker(this, tableName, dstSFT);
      }
@return An instance of MasterServices, an object NOT for general user-space Coprocessor
        consumption.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterCoprocessorHost.java