Iterate over large collection in MongoDB via spring-data

Question

Friends!

I am using MongoDB in java project via spring-data. I use Repository interfaces to access data in collections. For some processing I need to iterate over all el

Answer 1

Late response, but maybe will help someone in the future. Spring data doesn't provide any API to wrap Mongo DB Cursor capabilities. It uses it within find methods, but always returns completed list of objects. Options are to use Mongo API directly or to use Spring Data Paging API, something like that:

        final int pageLimit = 300;
        int pageNumber = 0;
        Page page = repository.findAll(new PageRequest(pageNumber, pageLimit));
        while (page.hasNextPage()) {
            processPageContent(page.getContent());
            page = repository.findAll(new PageRequest(++pageNumber, pageLimit));
        }
        // process last page
        processPageContent(page.getContent());

UPD (!) This method is not sufficient for large sets of data (see @Shawn Bush comments) Please use Mongo API directly for such cases.