###Resolution
Fix confirmed:
Tests.SortDupBug Page 1 #100 Total 11066 api.serverfault.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 11066 api.serverfault.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 --------------------------------------- Page 1 #100 Total 11157 api.superuser.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 11157 api.superuser.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 --------------------------------------- Page 1 #100 Total 8909 api.meta.stackoverflow.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 8909 api.meta.stackoverflow.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 --------------------------------------- Page 1 #100 Total 1904 api.webapps.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 1904 api.webapps.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0
Downgraded from red alert to "i wonder where else this will pop up".
It seems that the problem is grouping around short lists, or perhaps the end of lists.
Notice that some sites have a single odd dupe. This can be explained many ways and is to be expected.
The sites with less than 2 pages of users show significant anomalies.
Again, this could be due to a low user count or due to proximity to end of list.
Finding out why it is happening might shed light on other possible problems.
-------------------------------- Page 1 #100 Total 11024 api.serverfault.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 11024 api.serverfault.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 11111 api.superuser.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 11111 api.superuser.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 8867 api.meta.stackoverflow.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 8867 api.meta.stackoverflow.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 1866 api.webapps.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 1866 api.webapps.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 627 api.meta.webapps.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 627 api.meta.webapps.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 951 api.gaming.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 951 api.gaming.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 360 api.meta.gaming.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 360 api.meta.gaming.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 626 api.webmasters.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 626 api.webmasters.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 188 api.meta.webmasters.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #88 Total 188 api.meta.webmasters.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 575, -------------------------------- Page 1 #100 Total 772 api.cooking.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 772 api.cooking.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 88, -------------------------------- Page 1 #100 Total 268 api.meta.cooking.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 268 api.meta.cooking.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 176, -------------------------------- Page 1 #100 Total 213 api.gamedev.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 213 api.gamedev.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 109 api.meta.gamedev.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #9 Total 109 api.meta.gamedev.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 63, 60, 49, 16, 5, 4, 3, 2, -------------------------------- Page 1 #100 Total 172 api.gadgets.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #72 Total 172 api.gadgets.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 41, 38, 37, 34, 32, 30, 29, 25, 18, 21, 7, 11, 10, 4, -------------------------------- Page 1 #87 Total 87 api.meta.gadgets.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #0 Total 87 api.meta.gadgets.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 177 api.photo.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw 124 Page 2 #77 Total 177 api.photo.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #92 Total 92 api.meta.photo.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #0 Total 92 api.meta.photo.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 142 api.stats.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #42 Total 142 api.stats.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 135, 134, 35, 33, 30, 29, 21, 19, 18, 16, 12, 10, 7, 4, 3, 2, 43, 27, 53, 51, 50, 102, 94, 84, 76, 65, 64, 129, 127, -------------------------------- Page 1 #67 Total 67 api.meta.stats.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #0 Total 67 api.meta.stats.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 122 api.math.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #22 Total 122 api.math.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 98, 83, 81, 78, 77, 75, 71, 69, 68, 60, 46, 32, 27, 18, 15, 14, 7, 4, 2, -------------------------------- Page 1 #77 Total 77 api.meta.math.stackexchange.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #0 Total 77 api.meta.math.stackexchange.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0 -------------------------------- Page 1 #100 Total 1766 api.stackapps.com /users?max=2147483647&min=99&page=1&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Page 2 #100 Total 1766 api.stackapps.com /users?max=2147483647&min=99&page=2&pagesize=100&key=qgAq_KfDu0KYzlNG-qaTuw Dupes iteration 0