On Fri, 2008-05-09 at 13:20 +0200, Maarten ter Huurne wrote:
By returning the DeferredList from next_batch(), you are chaining Deferreds:
http://twistedmatrix.com/projects/core/documentation/howto/defer.html#auto11
If you remove the "return" from next_batch(), the problem disappears. If you want to be able to register a callback when all items are processed, it's probably better to create a dedicated Deferred for that instead of chaining the DeferredLists.
Thanks for your reply, Marteen!
I guess I'm a little mystified by what's going wrong here -- I chain deferreds all the time -- I'm not sure what it is about returning a few thousand deferreds wrapped up into a smaller number of DeferredLists that's causing the problem, and I'd like to understand why.
Steve