For people who are all excited about the long running tasks in 1.4.0,
be aware of a minor issue that queries still can't live more than 30
seconds (although this is no doubt subject to change)
You can't do this for more than 30 seconds (java devs excuse the
python):
for item in Model.all():
dosomething
It will still timeout after 30 seconds if you haven't gotten through
Model. Note that this pattern is highly inefficient anyhow as it only
grabs 20 rows at a time before doing another rpc.
You need to do Model.all().fetch(x), set x so you don't run out of
memory and wrap that in an outer loop that uses cursors to re-execute
the query.
For me it was simpler just to keep the old 30 second logic in place.
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