blueflood-core/src/main/java/com/rackspacecloud/blueflood/io/astyanax/APreaggregatedMetricsRW.java
@Override
    public Map<Locator, MetricData> getDatapointsForRange(List<Locator> locators,
                                                          Range range,
                                                          Granularity gran) {
        return AstyanaxReader.getInstance().getDatapointsForRange(locators, range, gran);
    }
@Override
    public Map<Locator, MetricData> getDatapointsForRange(List<Locator> locators,
                                                          Range range,
                                                          Granularity gran) {
        return AstyanaxReader.getInstance().getDatapointsForRange(locators, range, gran);
    }
Fetches {@link com.rackspacecloud.blueflood.outputs.formats.MetricData} objects for the
specified list of {@link com.rackspacecloud.blueflood.types.Locator} and
{@link com.rackspacecloud.blueflood.types.Range} from the specified column family

@param locators
@param range
@param gran
@return