@Override
      public void onComplete() {
        if (tableNotFound) {
          complete(tableName, req, null, new TableNotFoundException(tableName));
        } else if (!completeNormally) {
          complete(tableName, req, null, new IOException(
            "Unable to find region for '" + Bytes.toStringBinary(req.row) + "' in " + tableName));
        }
      }
The asynchronous locator for regions other than meta.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncNonMetaRegionLocator.java