I don't think it's related to transactions. As Ian mentioned above,
this behaviour is probably caused by in-memory cashing of the entire
datastore by the development server.
This is inconsistent with how the datastore works in production. While
there's a chance it won't be fixed, this behaviour at least should be
documented, as was the single-process nature of the development web
server. Filing an issue will speed this up.
On Jan 29, 1:40 pm, 3x3x3 nerd.l...@gmail.com wrote:
Thanks for quick reply.
Before filing an issue, let my problem clear enough.
Fromhttp://code.google.com/appengine/docs/python/datastore/transactions.html
The transaction function may be called multiple times if a datastore
operation fails due to another user updating entities in the entity
group at the same time.
Since dev_appserver serves only one request at a time and
running multiple server instances could not see datastore update each
other.
Is there any other way to test above scenario on local dev_appserver ?
On Jan 29, 10:42 am, Alexander Kojevnikov alexan...@kojevnikov.com
wrote:
Just tried it and indeed a new entity created from the first server's
admin does not appear in the admin of the second server. However,
after restarting the second server, the entity is there. Same thing
when deleting or updating the entities.
I suggest that you file an issue and post the link here so that we
could star it:http://code.google.com/p/googleappengine/issues/list
On Jan 29, 12:18 pm, 3x3x3 nerd.l...@gmail.com wrote:
Alex, thanks for your help.
I want to make some concurrent requests to test my transaction logic
on local dev_appserver.py.
I tried to run two instances of dev_appserver.py with different port:
8080 and 9000.
I didn't specify the datastore location path and supposed that both of
the two server instances share the same datastore.
I created a entity by using the development
consolehttp://localhost:8080/_ah/admin/datastore.
But I could NOT see the entity via the second dev_appserver instance
consolehttp://localhost:9000/_ah/admin/datastore.
Am I using dev_appserver in a wrong way?
On Jan 28, 9:25 pm, Alexander Kojevnikov alexan...@kojevnikov.com
wrote:
Yes, the development server can serve only one request at a
time:http://code.google.com/appengine/docs/python/tools/devserver.html#Usi...
On Jan 28, 9:03 pm, 3x3x3 nerd.l...@gmail.com wrote:
I run dev_appserver.py in Windows.
I add time.sleep(10) in one of my scripts and send request to that
script in browser.
During sleep, I send another request to other script in another
browser window.
It's seem that the second request is blocked until the first one has
done.
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