Hi infractus. What can happen is that the last 1 to 10 cards (up to 10 cards are "cached"), will not have their review status updated if you get a disconnect error. So the cards may not have moved up or back to the failed pile as expected. From the server point of view (where the database is), nothing happened with those cards. So there shouldn't be a need to delete them, instead if any cards weren't updated due to a disconnect, they will show up in subsequent reviews. Keep in mind they may also be mixed with newly added cards, so it is not necessarily obvious when the cards come back.

EDIT: Hmm, now I seem to remember there was a bug with disconnect whereby the card would be rated twice, so it would jump two boxes. I don't remember if it was fixed, I'll investigate.

What can happen is if the connection is really slow, on local side the website will show the disconnect error with the retry link. But on the server side the message may arrive moments later. Then when you retry the server received the message twice.

I don't think it was fixed and I'll make a point of fixing it ASAP.

I'm looking right now at the flashcard review code. I'll make it more robust in that the server will never update the same card twice in a review session, and also return exactly what cards have been succesfully updated to the client. That should fix the issue with double rating of cards that happen with some disconnects.

Alright, thank you very much. Based on your descriptions that describes the issue fine and the solution you implemented should work great.
I have a somewhat spotty internet connection so I appreciate that you've made the effort to resolve this.

Could you guys do some testing on the staging site I linked above? Maybe delete all cards and add just the first 50 ones, that you already know very well? Then if you have disconnects you could confirm if it works better?

If you let me know that it appears to work fine, I'll push the changes to the live site in the next few days.

It seems to be working better now. Had a few disconnects today and the cards didn't jump any boxes.

My connection is only bad at my place of work on Wednesdays (sometimes Fridays). I'm sorry I couldn't test the staging site for you.

I had a disconnect today, and when I pressed "reconnect" the reconnect link went away but the system didn't continue and clicking "end" did nothing, so I had to exit. The last 12 cards were still where they were before I reviewed.

Also, how many reviews are supposed to be lost on unclean exit? I thought I remembered reading "up to 6" somewhere, but it's always been more than 6 on previous occasions as well.

Last edited by bladethecoder (2010 July 07, 5:02 pm)

Hmm, I'm pretty sure it was 12. I'll try to keep an eye on the numbers in case it happens again.

Hi blade,

The bug is fixed. I have an update coming soon. I rewrote the flashcard "engine" to use a more elegant "ajax queue" logic, which solves this problem. Basically from next update you can always reconnect regardless of the situation.

I *may* be able to update the site this weekend. I will announce downtime one day ahead.