As Ikai said, this was added in support of making mapper more efficient. It's supposed to be completely invisible, so its visibility is a bug. Can you let me know where you're seeing it (admin console? API?) and your appid? Also, in case you're worried, Google is picking up the bill for this property, so it shouldn't affect your storage costs any.
Thanks -Fred On Jan 11, 12:29 pm, "Ikai Lan (Google)" <[email protected]> wrote: > The scatter property is being used to better distribute work across > different worker shards. Prior to the scatter property, there were several > incidents where work was unevenly distributed across tasks. > > -- > Ikai Lan > Developer Programs Engineer, Google App Engine > Blogger:http://googleappengine.blogspot.com > Reddit:http://www.reddit.com/r/appengine > Twitter:http://twitter.com/app_engine > > On Tue, Jan 11, 2011 at 11:06 AM, Stephen Johnson > <[email protected]>wrote: > > > > > > > > > Thanks Ikai, > > I've been using mapreduce for a long time and have never seen properties > > added to our own entities like that. I'll take a look and see what it's > > being used for so I understand it better and if this side-effect is > > documented anywhere since it is strange and a little disconcerting to see > > unknown properties popping up on your own entities. > > Thanks, > > Steve > > > On Tue, Jan 11, 2011 at 11:42 AM, Ikai Lan (Google) < > > [email protected] <ikai.l%[email protected]>> wrote: > > >> It's a property used by the Mapper API: > > >>http://www.google.com/codesearch?q=__scatter__+package:http://appengi....googlecode\.com&origq=__scatter__&btnG=Search+Trunk<http://www.google.com/codesearch?q=__scatter__+package:http://appengi...> > > >> -- > >> Ikai Lan > >> Developer Programs Engineer, Google App Engine > >> Blogger:http://googleappengine.blogspot.com > >> Reddit:http://www.reddit.com/r/appengine > >> Twitter:http://twitter.com/app_engine > > >> On Tue, Jan 11, 2011 at 9:32 AM, Stephen Johnson > >> <[email protected]>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? > > >>> -- > >>> You received this message because you are subscribed to the Google Groups > >>> "Google App Engine" group. > >>> To post to this group, send email to [email protected]. > >>> To unsubscribe from this group, send email to > >>> [email protected]<google-appengine%2Bunsubscrib > >>> [email protected]> > >>> . > >>> For more options, visit this group at > >>>http://groups.google.com/group/google-appengine?hl=en. > > >> -- > >> You received this message because you are subscribed to the Google Groups > >> "Google App Engine" group. > >> To post to this group, send email to [email protected]. > >> To unsubscribe from this group, send email to > >> [email protected]<google-appengine%2Bunsubscrib > >> [email protected]> > >> . > >> For more options, visit this group at > >>http://groups.google.com/group/google-appengine?hl=en. > > > -- > > You received this message because you are subscribed to the Google Groups > > "Google App Engine" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]<google-appengine%2Bunsubscrib > > [email protected]> > > . > > For more options, visit this group at > >http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
