@Override
        public Boolean call(RegionObserver observer) throws IOException {
          return observer.postExists(this, get, getResult());
        }
@param get    the Get request
@param result the result returned by the region server
@return the result to return to the client
@exception IOException Exception
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionCoprocessorHost.java