I recommend looking at Appstats, and verifying whether you are performing
batch gets across entity groups. I have not met an app yet that is unable to
get acceptable HRD performance.

I should note that apps built on M/S have (usually unintentionally) been
optimized for the M/S performance characteristics. It makes sense that some
apps may need to or want to make adjustments before migrating to HRD.

I should also point out that I have yet to meet a developer whose not
happier on HRD and migrating their app. You may well be the first (although
I'm not trying to imply that you are the only one)... :)

On Thu, Aug 18, 2011 at 12:11 PM, thstart <thst...@gmail.com> wrote:

> Let me share my experience.
>
> I was developing an AppEngine app for a year.
> It was very fast (extremely fast), with latency > 1 sec.
> When High Replication data-store was released I decided to give it
> a try and switched to it. Unfortunately the latency got >1 Sec
> sometimes > 2 Sec. The app worked a wile that way and because
> still in beta I could experiment. So I decided to go to Billed option
> to see if the reliability and more importantly the latency could improve.
> Unfortunately this do not affected latency. Then I decided to go back to
> Master/Slave - our customers mentioned immediately our app is 2 times
> faster - again < 1 Sec latency. Then I needed to add https which is
> very important for our app. This do not added significant latency so our
> customers are very happy with this solution. Soon we will go public.
>
> So the latency issue is a show stopper for high replication version
> and we would want to stay with master slave.
>
> Anybody with similar experience?
>
> Thank you,
>
>
>
>
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-- 
Fred Sauer
Developer Advocate
Google Inc.
1600 Amphitheatre Parkway
Mountain View, CA 94043
fre...@google.com

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