App Engine charges $6,500 to update a ListProperty on 14.1 million entities
Reading the thread (I'm curious about GAE, not an expert), it seems like the details aren't clear at all.  Neither the original poster nor the Google rep seem to have a clear idea of what I/O operations are being generated.<p>But this bit stood out: $0.10 per 100k writes.  That price seems to be far too high.  The poster is doing (something like) a reindex of 10M entries (that kind of data is pretty small really: it's the kind of database you might use as a test set on your laptop interactively). Figure each modification is atomic, and that the b-tree height of the storage is ~4.  So that's 40M writes to create an index, or $400!<p>Seriously?  Again, this is the kind of task you'd expect to do quickly and interactively on your development box, and it costs a price of the same order as your day's salary (!) to execute in the cloud?<p>Looking at this from the perspective of the underlying I/O device: this index consumes just a tiny, tiny fraction of a hard disk drive's capacity.  Yet creating it costs enough to <i>buy the device</i> several times over?<p>Something is wrong.  Is that a misquote or have I misunderstood?