TupleEntryIterator itr = tap.openForRead(CascadingUtil.get().getFlowProcess());
while (itr.hasNext()) {
TupleEntry cur = itr.next();
long split = cur.getLong(0);
FixedSizeBitSet curSet = new FixedSizeBitSet(splitSize, ((BytesWritable) cur.getObject(1)).getBytes());
for (long i = 0; i < curSet.numBits(); i++) {
if (curSet.get(i)) {
bitSet.set(split * splitSize + i);
}
}
}