Thanks for the reply.

If memcache is used, how do I implement it so that the counter would
always be updated and not be deleted?

On Mar 6, 4:35 am, "Ikai L (Google)" <ika...@google.com> wrote:
> Have you looked into Memcache's INCR?
>
> http://code.google.com/appengine/docs/java/javadoc/com/google/appengi...,
> long)
>
> This'll do it atomically, but you run the risk of it being volatile,
> so you'll have to account for that in your client code.
>
>
>
> On Tue, Mar 2, 2010 at 11:40 PM, legendlink <gregc...@gmail.com> wrote:
> > hi, i wanted to have a sequence generator that increments by x value
> > everytime it generates a value. if i would create the sequence
> > generator by using the datastore, it is likely that data contention
> > would occurr if there is high access times.
>
> > i have looked into the sample code of max ross in the google code
> > repository (SequenceExamplesJDO.java) and  think this is limited to
> > increment by 1 only and not increment by x value.
>
> > if sharding technique is used, my concern is that i might not get the
> > right sequence.
>
> > what is the best/elegant way of doing sequence generator that
> > increments x value?
>
> > --
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>
> --
> Ikai Lan
> Developer Programs Engineer, Google App 
> Enginehttp://googleappengine.blogspot.com|http://twitter.com/app_engine

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