I have started getting deadlock exceptions thrown from code that uses Guavas 
ConcurrentHashMap

http://code.google.com/p/googleappengine/issues/detail?id=5384

Aside from this problem, loading requests frequently seem to block on 
something (resource access?).  Normally they complete in 5-8 seconds but 
sometimes (~25%) they take 20 - 60 seconds or just time-out (DEEx).

I was not getting either of these problems with thread-safe=false but 
latency was higher so I don't want to switch back to that mode.

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