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Day 21: Tuesday, Mar 25th, 2014
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0. Read `Scaling Twitter <http://highscalability.com/scaling-twitter-making-twitter-10000-percent-faster>`__

1. Fill out `quiz <https://docs.google.com/a/msu.edu/forms/d/14CeY0FzxosXZwyGTFguH_mHCGXRV8xxBw3d3gSMzE9Y/viewform>`__.

2. Discussion.

3. Read through the image saving code in the `day 21 branch <https://github.com/ctb/cse491-serverz/tree/day21>`__ and understand what it does.  Talk amongst yourselves and discuss any problems this code might have for high traffic Web sites.  Fill out `this form <https://docs.google.com/forms/d/1VHRGxP3QI6zDKMO2DB2t1vyagFApUyf7rGceWi-Ajww/viewform>`__ when you're done.

   Note: You can also look at the `difference between the day20 and day21 branches <https://github.com/ctb/cse491-serverz/compare/day20...day21?expand=1>`__.

   Reminder, to look at the day21 serverz repo, put a copy in the directory
   'day21' by doing:::

     git clone https://github.com/ctb/cse491-serverz.git day21 -b day21

   and then to run it::

     cd day21/
     python2.7 run-imageapp.py