PartitionIteratingOperation::constructor -> OperationServiceImpl::invokeOnPartitions -> OperationServiceImpl::invokeOnAllPartitions -> PartitionServiceImpl::getMemberPartitionsMap line 948

```
            List<Integer> ownedPartitions = memberPartitions.get(owner);
            if (ownedPartitions == null) {
                ownedPartitions = new ArrayList<Integer>();
                memberPartitions.put(owner, ownedPartitions);
            }
```