oh, now i see the instructions: they are not in the docs but only appear on 
the migration webpage when the migration reaches the last phase:


The data copy is now complete. You can validate the destination app's 
> performance on the High Replication datastore before redirecting traffic to 
> the new app.
> You may set the destination to read-write mode and redirect traffic to 
> there now. This step can not be reverted.



my app is just a prototype.  so, i'm assuming that if I enable read-write 
mode on both the source and destination at this point,
then i have a working backup of my original source app + a working HRD 
version of my app that i can start writing to and validating with my code 
(not just by looking at the datastore values).
the HRD version can't be reverted, but the source master-slave app can be 
re-migrated if there turn out to be problems with the hrd version, right?




On Monday, January 14, 2013 11:50:32 PM UTC+8, Dennis wrote:
>
>
> I'm in the process of migrating from master-slave datastore to hrd.
>
> I followed the instructions, blindly, because there is little explanation 
> of what is happening in each phase.
> Now, i'm just before the last phase of "finish migration".
> But I test my hrd app: it does not work.
> the logs say that writes have been disabled.  there was no mention of that 
> in the docs.
>
> what should I do?
> enable writes in my hrd and test the app?
> if it has problems then abort the migration?
> there is no mention of "enabling writes" in the hrd migration docs.
>

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