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From Stuart Johnson <>
Subject Re: Google App Engine
Date Sat, 16 Oct 2010 12:11:11 GMT
  Hi Avdhesh,

No, Blobstore and Datastore are not the same.  Blobstore is more like 
Amazon S3.  You have a key, and a binary blob of data.  All you can do 
is insert and delete. Blobstore does not have the same restrictions on 
the amout of data you can store.

There is one very interesting feature of Blobstore.  There is an 
additional API, that will do image transformations on the fly.  For 
example, you can specify the size of image you want, on retrieval.  So 
there is no need to store thumbnails on all your uploaded images. 
Details here:


On 16/10/10 04:49, Avdhesh Yadav wrote:
> Luciano  Is blob store and data store same thing ? I have found a simple
> data Store library for google app engine [1]
> [1]
> On Sat, Oct 16, 2010 at 8:13 AM, Stuart Johnson<>  wrote:
>>   Hey Stuart
>>>     We support deploying PhotArk in Google AppEngine, and we seem to be
>>> a good option for you. We still need to add a small adapter to read
>>> from the blob store, but other then that, we should be able to be your
>>> GAE Gallery. Would you feel comfortable helping us write the "blob
>>> store" adapter ?
>> Hi Luciano, yes I am happy to help. I have only been working with
>> Java/Eclipse/AppEngine for a week, so it's fairly new to me. I'm using App
>> Engine as a data store for a Mono/C# server application I have.  I'm working
>> with pictures at the moment, but would like to add video support later.
>> Stuart.

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