return TabularData.class.cast(connection.invoke(objName,
operationName, null, null));
} catch (IOException e) {
throw new MetricUnreachableException("Unable to get operation return value for " + objName + "->" + operationName, e);
} catch (Exception e) {
throw new MetricNotFoundException("Unable to get operation return value for " + objName + "->" + operationName, e);
}
}