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POHow to cache files over 1MB with rack/cache on Heroku?
 

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  1. POHow to cache files over 1MB with rack/cache on Heroku?
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    <p>I'm using a combination of <a href="http://markevans.github.io/dragonfly/" rel="noreferrer">Dragonfly</a> and <a href="http://rtomayko.github.io/rack-cache/" rel="noreferrer">rack/cache</a> hosted on Heroku.</p> <p>I'm using Dragonfly for uploaded assets. Thumbnails are processed on-the-fly and stored in rack/cache for fast delivery from memcached (via the <a href="https://addons.heroku.com/memcachier" rel="noreferrer">Memcachier addon</a>).</p> <p>Regular static assets are also cached in memcached via rack/cache.</p> <p>My problem is that any uploaded files over 1MB are causing a 500 error in my application.</p> <pre><code>2013-07-15T10:38:27.040992+00:00 app[web.1]: DalliError: Value too large, memcached can only store 1048576 bytes per key [key: d49c36d5db74ef45e957cf169a0b27b83b9e84de, size: 1502314] 2013-07-15T10:38:27.052255+00:00 app[web.1]: cache: [GET /media/BAhbBlsHOgZmSSIdNTA3Njk3ZWFiODBmNDEwMDEzMDAzNjA4BjoGRVQ/WTW_A5Flyer_HealthcareMedicalObsGynae_WEB.pdf] miss, store 2013-07-15T10:38:27.060583+00:00 app[web.1]: !! Unexpected error while processing request: undefined method `each' for nil:NilClass </code></pre> <p>Memcache has a limit of 1MB, so I can understand why my asset was not cached, but I would rather it didn't break serving assets.</p> <p>I'm not even sure where this error is coming from. Presumably from one of the other rack middlewares?</p> <p>Increasing the maximum file size doesn't seem to have have any affect. </p> <pre><code>config.cache_store = :dalli_store, ENV["MEMCACHIER_SERVERS"].split(","), {¬ :username =&gt; ENV["MEMCACHIER_USERNAME"],¬ :password =&gt; ENV["MEMCACHIER_PASSWORD"],¬ :value_max_bytes =&gt; 5242880 # 5MB¬ } </code></pre> <p>Long term, I know that moving this sort of asset off of Heroku is a sensible move, but that won't be a quick job.</p> <p>What can I do to serve these assets on Heroku in the meantime without errors?</p>
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