It's a property used by the Mapper API:

http://www.google.com/codesearch?q=__scatter__+package:http://appengine-mapreduce\.googlecode\.com&origq=__scatter__&btnG=Search+Trunk

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Ikai Lan
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On Tue, Jan 11, 2011 at 9:32 AM, Stephen Johnson <onepagewo...@gmail.com>wrote:

> Checking my datastore statistics today I noticed that a new property
> has magically appeared named __scatter__ of type ShortBlob. I don't
> have any property defined with this name and it has the App Engine
> format of __xyz__ naming so I'm assuming it's something Google has
> introduced. However, this is a little disconcerting that it is showing
> up in datastore statistics and no mention of this has been provided by
> google. Also, it doesn't show up in the datastore viewere. Is anyone
> else seeing this magic property? Should I be concerned? Anyone know
> it's purpose?
>
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