It seems like we did the same research on this issue.
I had the same problem except with Windows 7 and my development environment
is PyCharm 2.5. The only way I could get the development app server to
successfully persist to disk is by invoking it from the command line and
sending a keyboard interrupt to the console when I was finished. I could
not reproduce this issue using Linux (Ubuntu 11.10 64bit) or Mac OS X 10.7.
This is a case where I literally solved my problem by not using Windows.
I realize that isn't an option for everyone, so I would try manually
handling the start-up and shutdown of the dev app server.
On Friday, April 20, 2012 7:33:01 AM UTC-4, Jeff Gager wrote:
>
> I have just started using GAE (Python 2.7 SDK 1.6.4) , I have set up a
> simple test project using Pydev (latest version) in eclipse (indigo)
> on Windows XP (SP3).
>
> It all works fine, I can persist data in the datastore and blobstore
> and then retrieve it, but when I stop the development server and start
> it again the data in the datastore is lost. This is not the case for
> the blobstore which is retaining blobs fine and I can see the
> blobstore folder that gets created in C:\Temp
>
> I did the sensible thing and look back through old posts and found
> that most people who have this problem solve it by changing the
> location of the datastore file, so I used the following parameters;
>
> --datastore_path="${workspace_loc}/myproject/datastore" --
> blobstore_path="${workspace_loc}/myproject/blobstore" "$
> {workspace_loc}/myproject/src"
>
> I moved the blobstore at the same time as you can see.
>
> The blobstore still works, and now the blobstore folder is created in
> myproject folder as expected. The datastore file is still not created
> however, and when I stop and restart the development server the data
> is still lost.
>
> The dev server startup logs include the following entry
>
> WARNING 2012-04-20 10:49:04,513 datastore_file_stub.py:513] Could not
> read datastore data from C:\myworkspace\myproject\datastore
>
> So I know it is trying to create the datastore in the correct place.
>
> Finally I lifted the whole eclipse workspace folder and copied it to
> another computer with exactly the same setup except it is running
> Windows 7 instead of Windows XP.
>
> Everything works fine there - both the datastore file and blobstore
> folder are now created where I expect them to be.
>
> I have set up eclipse, python, gae, my project and my eclipse launch
> file in exactly the same way on two computers, it works on one and
> not the other. Maybe XP is something to do with it but to be honest I
> think that's unlikely.
>
> The only other clue I have come up with is that a recent change to the
> GAE development server stopped writing to the datastore file after
> every change and only flushes on exit, see this
>
> http://stackoverflow.com/questions/10060172/gae-sdk-1-6-4-dev-appserver-datastore-flush
>
>
> adding the following to my code did not help at all however
>
> from google.appengine.tools import dev_appserver
> import atexit
> atexit.register(dev_appserver.TearDownStubs)
>
> So it's not down to incorrect termination sequence either as far as I
> can tell.
>
> Anyway I am stumped and I would be really grateful for suggestions you
> guys can come up with.
>
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