@Override
    public boolean hasResult() {
      return true;
    }
Gathers the local data on the region and sends it back to the {@link ResultCollector} in
serialized form as {@link SnapshotPacket}s. Uses a sliding window provided by the
{@link FlowController} to avoid over-running the exporting member.

@param <K> the key type
@param <V> the value type

@see FlowController
geode-core/src/main/java/org/apache/geode/internal/cache/snapshot/WindowedExporter.java