Method call

src/HBaseClient.java:2783–2802

(final Exception ex)

           */
          class ErrorCB implements Callback<Deferred<Object>, Exception> {
            @Override
            public Deferred<Object> call(final Exception ex) throws Exception {
              Throwable cause = ex;
              if (ex instanceof DeferredGroupException) {
                cause = ((DeferredGroupException) ex).getCause();
              } 
              if (cause instanceof UnknownProtocolException) {
                // we may be using 2.0 so we need to try scanning meta
                // instead of calling getClosestRowBefore
                LOG.info("HBase may be running version 2.0 or newer. "
                    + "Trying to search meta via scan instead of gets.");
                scan_meta = true; // volatile flag
                return locateRegion(request, 
                                    table, 
                                    key, 
                                    closest_before, 
                                    return_location);
              }
              throw ex;
            }
          }
          
          if (return_location) {