Hey,

Yesterday, I've had a service running to delete a huge (1 TB) backlog of 
data from our appengine instance. It was working well at around 100 
entities/sec (has about a million entities). Today, however, it slowed down 
to around 0-1 entities/sec, using the same code.

I tracked it down to queries taking very long and then failing at a rate of 
around 90% with a timeout exception. I've configured the deadline to None, 
but that didn't help. Plus, yesterday everything worked fine, I've deleted 
around a million entities before it started to choke.

The application ID is 'towermadness', the backend ID is 'deleter'.

Thanks!
Volker

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