protected Collection<MultiMapRecord> getInternal(Data key){
throwExceptionIfNull(key);
Collection<MultiMapRecord> coll = txMap.get(key);
if (coll == null){
GetAllOperation operation = new GetAllOperation(name, key);
try {
int partitionId = getNodeEngine().getPartitionService().getPartitionId(key);
Future<MultiMapResponse> f = getNodeEngine().getOperationService().invokeOnPartition(MultiMapService.SERVICE_NAME, operation, partitionId);
MultiMapResponse response = f.get();
coll = response.getRecordCollection(getNodeEngine());