In AbstractRocksDBState.writeKeyAndNamespace():
protected void writeKeyAndNamespace(DataOutputView out) throws IOException {
backend.keySerializer().serialize(backend.currentKey(), out);
out.writeByte(42);
namespaceSerializer.serialize(currentNamespace, out);
}Why write a byte 42 between key and namespace? The keySerializer and namespaceSerializer know their lengths. It seems we don't need this byte. Could anybody tell me what it is for? Is there any situation that we must have this separator?
