Bug - Mixing LimitFilter and Comparator?

Question

Hi guys,
We're running into a strange issue where we are using a limitfilter for pagination on an ordered query (Coherence 3.5.2). In other words, we're using cache.entrySet(limitFilter, comparator);
We set page size to 5, and put in 8 records e.g. "1, 2, 3, 4, 5, 6, 7, 8". I would expect that we would get the following pages {1, 2, 3, 4, 5},{6, 7, 8}. But instead we're getting a duplicates in our last page. In other words, we're actually getting {1, 2, 3, 4, 5}, {6, 6, 7, 7, 8}.
With six records instead of {1, 2, 3, 4, 5},{6}, but we are getting {1,2,3,4,5},{6,6}
With seven records instead of {1, 2, 3, 4, 5},{6, 7}, we are getting {1,2,3,4,5},{6,6,7,7}
With eight records instead of {1, 2, 3, 4, 5},{6, 7, 8}, we are getting {1,2,3,4,5},{6,6,7,7, 8}
With nine records instead of {1, 2, 3, 4, 5},{6, 7, 8, 9}, we are getting {1,2,3,4,5},{6,6,7,7, 8}, {9,9}
With ten records we correctly get {1, 2, 3, 4, 5},{6, 7, 8, 9, 10}.
We have tested that the comparator works correctly.
Can someone help us out?
Edited by: user12004023 on Jan 14, 2010 3:01 PM

Answer 1

We have an idea on what creates this issue. It only happens if you get the second to last page, then get the last page, without getting any pages in between. This will naturally happen if you're iterating through the pages. It seems to be a problem with the anchors. The problem goes away if you clear the anchors right before you get the last page.