- All Implemented Interfaces:
- Direct Known Subclasses:
This data bag will gather distinct items in memory until a size threshold is passed, at which point it will write out all of the items to disk using the supplied serializer.
After adding is finished, call
iterator() to set up the data bag for reading back items and iterating over them.
The iterator will retrieve only distinct items.
IMPORTANT: You may not add any more items after this call. You may subsequently call
times which will give you a new iterator for each invocation. If you do not consume the entire iterator, you should
Iter.close(Iterator) to close any FileInputStreams associated with the iterator.
Additionally, make sure to call
SortedDataBag.close() when you are finished to free any system resources (preferably in a finally block).
Implementation Notes: Data is stored without duplicates as it comes in in a HashSet. When it is time to spill, that data is sorted and written to disk. An iterator that eliminates adjacent duplicates is used in conjunction with the SortedDataBag's iterator.
isSortedpublic boolean isSorted()Description copied from interface:
DataBagFind out if the bag is sorted.
isDistinctpublic boolean isDistinct()Description copied from interface:
DataBagFind out if the bag is distinct.
iteratorDescription copied from class:
SortedDataBagReturns an iterator over a set of elements of type E. If you do not exhaust the iterator, you should call
Iter.close(Iterator)to be sure any open file handles are closed.