Youtube View Counter
Youtube recently ran into issues with it’s view counter for the Gangnum Style video. Basically, Google was using 32-bit integers to store the view counter value for its videos. This means that it had a maximum possible value of 2,147,483,647. This essentially “broke the internet” (at least for this one video) when the number of views passed that limit. My friend Allen asked me why Google didn’t already use the 64-bit version (which has a maximum value of 9,223,372,036,854,775,807… that’s nine quintillion with a Q) rather than 32-bit version. The answer: bandwidth.
First, Some Stats & Facts:
- In January 2012, Google had over 4 billion views per day. It’s definitely more now, but this is the most up-to-date stat I could find.
- Every time you load a Youtube video, you are downloading that view counter (along with the video and everything else on the page).
- 32-bit integers take up 4 Bytes; 64-bit integers take up 8 Bytes.
Now For Some Math:
oldCounterBandwidth = ( 4 Bytes / view ) * ( 4 billion views / day ) = 16 GB / day newCounterBandwidth = ( 8 Bytes / view ) * ( 4 billion views / day ) = 32 GB / day
Note: Final values were converted from Bytes to GigaBytes for clarity.
By converting to 64-bit integers to store the view counters, they are doubling their bandwidth from 16 GB per day to 32 GB per day…. just to load view counters. Keep in mind that the daily view stat I found is from January 2012.