Google has said in the past that there is no negative performance effect from enabling XG transactions if you only use a single entity group. The rational thing to do is always enable XG transactions all the time, but be aware when you span multiple entity groups in a transaction.
I think it was silly of them to add this flag. Jeff On Sat, Jan 14, 2012 at 8:23 AM, Mike Lawrence <m...@systemsplanet.com> wrote: > I guess I didn't expect to see mention of requiring entity groups for > transactions now that GAE supports cross-entity-group transactions. > > Does GAE really need both modes? > Is there a performance benefit to not > enabling global transactions? > > > On Jan 13, 3:25 m, "Ikai Lan (Google)" <ika...@google.com> wrote: >> Actually, I took a look at these docs and it seems like we do talk about >> cross group transactions. There are a few areas where we talk about >> exceptions being thrown for transactions on entities in different entity >> groups, but that's expected behavior. You must specify that you want a >> cross-group transaction. >> >> We'd definitely like to improve these docs, however. Do you have any >> suggestions or areas where this documentation seems confusing? >> >> -- >> Ikai Lan >> Developer Programs Engineer, Google App Engine >> plus.ikailan.com | twitter.com/ikai >> >> On Fri, Jan 13, 2012 at 12:23 PM, Ikai Lan (Google) <ika...@google.com>wrote: >> >> >> >> > Thanks! I'll file a bug for this since it's not merely a one line fix. >> > We'll probably want to better explain cross-entity group transactions a bit >> > and link to the documentation on that subject. >> >> > -- >> > Ikai Lan >> > Developer Programs Engineer, Google App Engine >> > plus.ikailan.com | twitter.com/ikai >> >> > On Fri, Jan 13, 2012 at 11:12 AM, Mike Lawrence >> > <m...@systemsplanet.com>wrote: >> >> >> Ikai, >> >> Docs still say transactions wont span entity groups: >> >>http://code.google.com/appengine/docs/java/datastore/transactions.html >> >> >>http://code.google.com/p/googleappengine/wiki/SdkForJavaReleaseNotes >> >> Version 1.5.5 - Oct 11, 2011 >> >> App Engine now supports Cross Group (XG) transactions with the >> >> High Replication Datastore, which allow you to perform transactions >> >> across multiple entity groups. >> >>http://code.google.com/appengine/docs/java/datastore/transactions.html >> >> >> Sincerely, Mike Lawrence >> >> >> On Thu, Jan 12, 2012 at 12:23 AM, >> >> <google-appengine-java@googlegroups.com> wrote: >> >> > Today's Topic Summary >> >> >> > Group:http://groups.google.com/group/google-appengine-java/topics >> >> >> > problem with Content-type: null with css files [1 Update] >> >> > Minor update to Java SDK: 1.6.1.1 [1 Update] >> >> > [No Subject] [1 Update] >> >> > proxying datastore request [3 Updates] >> >> > how to get the correct time for germany? [2 Updates] >> >> >> > problem with Content-type: null with css files >> >> >> > "Ikai Lan (Google)" <ika...@google.com> Jan 11 05:22PM -0800 >> >> >> > We have an SDK update that resolves this issue on upload (I've also >> >> posted >> >> > in a separate thread about this): >> >> > ...more >> >> >> > Minor update to Java SDK: 1.6.1.1 >> >> >> > "Ikai Lan (Google)" <ika...@google.com> Jan 11 05:21PM -0800 >> >> >> > Hey everyone, >> >> >> > There's a new version of the Java SDK available for download. You can >> >> get >> >> > it here: >> >> >>http://code.google.com/p/googleappengine/downloads/detail?name=appeng... >> >> > ...more >> >> >> > [No Subject] >> >> >> > Aviv Keren <aviv...@gmail.com> Jan 11 11:08PM +0200 >> >> >> > Ok tnx! >> >> > ...more >> >> >> > proxying datastore request >> >> >> > meiaestro <jmalbre...@gmx.de> Jan 11 07:18AM -0800 >> >> >> > Hi all! >> >> >> > I was thinking about making my RPC calls to the server (datastore >> >> commands) >> >> > more secure against java script or data stream modifications on client >> >> side >> >> > (when user is already signed ...more >> >> >> > "Ikai Lan (Google)" <ika...@google.com> Jan 11 10:44AM -0800 >> >> >> > Hi there! >> >> >> > "- a logged in user could manipulate the RPC call (he could for >> >> > example exchange his userID by the ID of someone else and access the >> >> data >> >> > of this user)**** >> >> >> > - to avoid that I need to ...more >> >> >> > meiaestro <jmalbre...@gmx.de> Jan 11 12:31PM -0800 >> >> >> > Thanks for the reply. >> >> >> > You're right. I did not use the Users API, as I do not want to force the >> >> > users to have a google account (or any other existing account). This >> >> will >> >> > be optional at a ...more >> >> >> > how to get the correct time for germany? >> >> >> > vega <_v...@vr-web.de> Jan 11 07:24AM -0800 >> >> >> > hi everyone. >> >> >> > since the days are getting longer, i noticed that in 2 months ill have >> >> an >> >> > error with my getTime() Method, which gives me the current time in a >> >> "human >> >> > friendly" way. >> >> >> > /** ...more >> >> >> > Ian Marshall <ianmarshall...@gmail.com> Jan 11 08:44AM -0800 >> >> >> > The code below is how I do this. It works for summer and winter times >> >> > automajically. >> >> >> > public static final Locale G_LOCALE_UK = Locale.UK; >> >> > public static final String G_S_TIME_ZONE_ID = ...more >> >> >> > You received this message because you are subscribed to the Google Group >> >> > google-appengine-java. >> >> > You can post via email. >> >> > To unsubscribe from this group, send an empty message. >> >> > For more options, visit this group. >> >> >> > -- >> >> > You received this message because you are subscribed to the Google >> >> Groups >> >> > "Google App Engine for Java" group. >> >> > To post to this group, send email to >> >> google-appengine-java@googlegroups.com. >> >> > To unsubscribe from this group, send email to >> >> > google-appengine-java+unsubscr...@googlegroups.com. >> >> > For more options, visit this group at >> >> >http://groups.google.com/group/google-appengine-java?hl=en. >> >> >> -- >> >> You received this message because you are subscribed to the Google Groups >> >> "Google App Engine for Java" group. >> >> To post to this group, send email to >> >> google-appengine-java@googlegroups.com. >> >> To unsubscribe from this group, send email to >> >> google-appengine-java+unsubscr...@googlegroups.com. >> >> For more options, visit this group at >> >>http://groups.google.com/group/google-appengine-java?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to google-appengine-java@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine-java+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
