My only two comments are:

   - MemCache can contain null values - it wouldn't be the cause of your 
   issue but it's worth checking for null, rather than assuming that the 
   returned value has a length.
   - Your data will never stay in MemCache for 30 days - how often are your 
   calls between put and get?  The longest I've seen data stay in MemCache is 
   around a day and it can be as little as a few minutes.
   

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