Maciej Wisniowski wrote at 2007-4-11 20:28 +0200:
Currently I have some problems with our application (Zope2.8.4) and with Conflict Errors in sessions. In general if we have few concurrent requests that are running sometimes for 3-4 minutes (and they're touching session inside) I get a lot of conflict errors with Inceraser, OOBTree, Length2 etc.
Session conflict errors are very common -- for the following reason: While individual sessions are usually used only by a single request at a time, they share common administrative data structures (e.g. the OOBTree that holds the session objects). The administrative data structures usually have conflict resolution *BUT* conflict resolution requires sufficient history -- and the temporary storage usually holding the sessions only has minimal history. Therefore, conflict resolution is usually ineffective (impossible) and you get lots of conflicts. -- Dieter