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

@param locator
@param range
@param gran
@return