// Appends a new packet of buffered deletes to the stream,
// setting its generation:
public synchronized long push(FrozenBufferedDeletes packet) {
/*
* The insert operation must be atomic. If we let threads increment the gen
* and push the packet afterwards we risk that packets are out of order.
* With DWPT this is possible if two or more flushes are racing for pushing
* updates. If the pushed packets get our of order would loose documents
* since deletes are applied to the wrong segments.
*/
packet.setDelGen(nextGen++);
assert packet.any();
assert checkDeleteStats();
assert packet.delGen() < nextGen;
assert deletes.isEmpty() || deletes.get(deletes.size() - 1).delGen() < packet.delGen()
: "Delete packets must be in order";
deletes.add(packet);
numTerms.addAndGet(packet.numTermDeletes);
bytesUsed.addAndGet(packet.bytesUsed);
if (infoStream.isEnabled("BD")) {
infoStream.message(
"BD",
"push deletes "
+ packet
+ " delGen="
+ packet.delGen()
+ " packetCount="
+ deletes.size()
+ " totBytesUsed="
+ bytesUsed.get());
}
assert checkDeleteStats();
return packet.delGen();
}
