quick answer: no, I don't use datastore as a queue (although I am using Task 
Queues, and some of the tasks recover info from Datastore as part of its 
job. And also recover data from memcache, and also do some retrieval of data 
using GData APIs, and also do some calculations).
By the way, do you consider a rate of 8 requests per minute a high 
throughput? The queue rate for the queue that is hanging is now configured 
to a maximum of 32/min, but the cron job that runs every minute to enqueue 
tasks in the specific queue that hangs does enqueue, at a maximum, 8 tasks 
per run, so I could lower the rate to 8/min (0.13 tasks per second) if you 
consider 32/min is too high.

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