transactionId(Pair<int64_t, int64_t>(machineId, clientLocalSequenceNumber)),
partId(Pair<int64_t, int32_t>(clientLocalSequenceNumber, partNumber)),
data(_data) {
transactionId(Pair<int64_t, int64_t>(machineId, clientLocalSequenceNumber)),
partId(Pair<int64_t, int32_t>(clientLocalSequenceNumber, partNumber)),
data(_data) {