The replication lag affects actual entity data as well as indexes. -- 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 Fri, Jan 7, 2011 at 12:05 PM, Waldemar Kornewald <[email protected]>wrote: > Hi Ikai, > > On Friday, January 7, 2011 12:09:24 AM UTC+1, Ikai Lan (Google) wrote: >> >> Hey guys, some answers to your questions that we've compiled from various >> team members (mostly Alfred, presenter of "Next Gen Queries" and the fourth >> one from the left in this video >> http://www.youtube.com/watch?v=dg0TEIRQePg): >> >> - Typically, how long does it take for HR query data to become consistent >> (a ballpark figure)? >> >> 100ms is the estimate. However - we have seen cases where this can be >> higher. If you were to use the eventual consistency read option in the >> master-slave configuration, we've seen that the average replication lag is >> about 3 minutes with an upper bound of 10 minutes. >> > > Does the eventual consistency lag only affect DB indexes (i.e. the query > results contain up-to-date entities as if fetched via db.get(), but they > might not really match the query, anymore)? Or does the lag affect the > actual entity data returned by the query (i.e. the results contain > *outdated* entities, IOW returning older data than db.get())? > > Bye, > Waldemar Kornewald > > -- > 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%[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.
