Baker Linden got us some new information this week in the Server-Scripting UG on the fix for Large Group Editing Problems.
For the last two months he has been trying to solve the problem of getting large data sets to transfer reliably via the current API (application programming interface) running over UDP (an Internet protocol – think of it as a spoken language), which is the protocol all viewers use now to get group member lists. It is when that UDP transfer fails that people have problems with group member lists failing to load. Those failures also create some simulator side issues that degrade performance.
The practical limit for use with UDP is a member list of about 10,000 members. Any group larger will not reliably download. On some connections even the smaller 10k list will have problems. Sometimes larger lists will download. Sometimes they won’t. Baker has optimized the SQL query that pulls the list and eliminated as many timing problems as possible. I get the impression that several SQL tricks were tried, like breaking up queries and batching group of members for transfer were tried. But, in the end it simply is not going to work. So, the new API is going to use HTTP for the transfer. Eventually the UDP service tube for group member lists will be eliminated.
