Glitch on wanikani

My page says “Available Now” but I just finished all reviews. Any ideas?

I have the same issue. It’ll probably be fixed soon!

Yep we are on it.


We have reverted an update we made a couple hours ago.

Some bad news.

A subset of reviews done between 12:10PM PDT to 01:20PM PDT did not get registered. Unfortunately, there is no way for us to recover these reviews. This is a something we are really sorry for and it was definitely something we didn’t anticipate. What this means is there are some reviews in the mentioned time period which will appear in your review queue again at their previous SRS state. Again, this applies to a subset of reviews done in the aforementioned time period.

At the technical level this is what happened.

Before the change, we used Memcached as a cache store. We also use Redis, mainly for background-job queueing. Today, we transitioned to the same Redis instance for cache storage. When the Redis instance exceeded its memory allotment, it started using the LRU algorithm to manage memory. That algorithm started dropping some queued background jobs, many of which were for post-review processing.

So the question is: what are we going to do to make sure this doesn’t happen again.

  • We have reverted back to our previous caching set-up.
  • We had specced out changes to make activity tracking more robust a while back and planned on tackling it later in the quarter. This goal has now been reprioritized and is now on the top of our list. With what we specced out, recovering reviews would have been trivial.

Again we are really sorry this has happened. If anyone has any further questions or concerns feel free to leave them in this thread or contact us at


Thanks for the great reply (was sent here for similar question)

Working on improvements that caused a bug, that is very common and acceptable. You where trying to make an improvement after all =)
Hope it gets figured out, either by staying on the old or find a way to go over to the new. Improvements are always good, it is worth the bugs, as long as they get squashed as they are found :wink:

Thanks for your hard work!

I was just wondering if all the lost reviews should have been returned by now? Because some showed up, but according to WK and the Ultimate Timeline there are still 5 reviews in limbo. I’m not in a hurry, just letting you know in case it should be back to normal but isn’t.

Ah! I wondered what had happened there but I just redid those reviews.

Shit happens. Better luck next time!

Do you see the reviews on WK now? If you do them, they’ll update, and the Timeline and the app should be back in sync.

Yesss, all back to normal! Thank you for the quick action and reply!

Just did 500 reviews and only had to redo ~30 due to this. I’m happy I didn’t start sooner, it could have been so much worse.


Unfortunately, it looks like the bug is still existing… Just finished some reviews and the timer hasn’t reset.

False alarm. Timer is back. Just a little slow.

This topic was automatically closed 365 days after the last reply. New replies are no longer allowed.