1) simultaneous operation of multiple active sync replication threads
2) cookie management for individual sync replication thread
(include rid=%3d to the slapd cookie command line option (-c))
- memory based session history to minimize sync traffic
- when client is covered by a session history, then
[add+delete] mode is used
- when client cookie is not covered by the history because
the cookie is too outdated and/or the history is truncated,
[add+present] mode is used
2. Sync cookie syntax : comma separated name=value pairs
- csn=yyyymmddhh:mm:ssZ#0xSSSS#r#ssssr,sid=nnn
