@Override
  public Set<?> keySet() {
    recordTXOperation(ServerRegionOperation.KEY_SET, null);
    return KeySetOp.execute(pool, regionName);
  }
Does a region clear on the server using the given connection.

@param con the connection to use to send to the server
@param eventId the event id for this clear
@param callbackArg an optional callback arg to pass to any cache callbacks
geode-core/src/main/java/org/apache/geode/cache/client/internal/ServerRegionProxy.java