Map<String,List<String>> kvs = Maps.newHashMap();
Tuple startTuple = new VTuple(1);
startTuple.put(0, DatumFactory.createInt4(50));
kvs.put("start", Lists.newArrayList(
new String(Base64.encodeBase64(
encoder.toBytes(startTuple), false))));
Tuple endTuple = new VTuple(1);
endTuple.put(0, DatumFactory.createInt4(80));
kvs.put("end", Lists.newArrayList(
new String(Base64.encodeBase64(
encoder.toBytes(endTuple), false))));