Re: Zeo and two processes changing the zodb - not getting the up to date version of the object

Le 02/02/17 à 11:53, Jo Gilder a écrit :
> Thanks, I haven't used monkey patches before.
> 
> I have now wrapped my readonly code in an explicit transaction and using readCurrent seems to be doing the job. More testing needed though.

Maybe I didn't understand your issue but readCurrent has a different purpose than all other suggested solutions (which actually all do the same thing):
- ZEO 5 with server-sync true
- ping the server explictely before transaction.begin() (which may be annoying to maintain in your code)
- use our monkey-patch

Julien

> On Thursday, 2 February 2017 09:50:34 UTC, Julien Muchembled wrote:
> 
>     Le 02/02/17 à 10:26, Jo Gilder a écrit :
>     > Hi, do you have an example of this in use? I can't see where it is used in your code base.
> 
>     It's a monkey-patch. Once this module is loaded, we know that we have a up-to-date view of the DB when we start a transaction.
> 
>     Here is a place where it's important for us to have such behaviour:
>       https://lab.nexedi.com/nexedi/erp5/blob/f6d96c460323a5b7094feff2fbbf545deb9195db/product/CMFActivity/Activity/SQLBase.py#L497 <https://lab.nexedi.com/nexedi/erp5/blob/f6d96c460323a5b7094feff2fbbf545deb9195db/product/CMFActivity/Activity/SQLBase.py#L497>
> 
>     To check this, we also have a unit test at
>       https://lab.nexedi.com/nexedi/erp5/blob/f6d96c460323a5b7094feff2fbbf545deb9195db/product/ERP5/tests/testInvalidationBug.py#L93 <https://lab.nexedi.com/nexedi/erp5/blob/f6d96c460323a5b7094feff2fbbf545deb9195db/product/ERP5/tests/testInvalidationBug.py#L93>
> 
>     Julien
> 
>     > On Wednesday, 1 February 2017 18:05:11 UTC, Julien Muchembled wrote:
>     > 
>     >     Le 02/01/17 à 18:37, Jo Gilder a écrit :
>     >     > I'm running zeo 4. Is there any way to do this without upgrading? We are a week away from a release and upgrading zeo means upgrading lots of other packages too.
>     >     > 
>     >     You can use our monkey-patch on
>     >       Connection.ping
>     >     and
>     >       Connection.newTransaction
>     > 
>     >     https://lab.nexedi.com/nexedi/erp5/blob/master/product/ERP5Type/patches/ZODBConnection.py <https://lab.nexedi.com/nexedi/erp5/blob/master/product/ERP5Type/patches/ZODBConnection.py> <https://lab.nexedi.com/nexedi/erp5/blob/master/product/ERP5Type/patches/ZODBConnection.py <https://lab.nexedi.com/nexedi/erp5/blob/master/product/ERP5Type/patches/ZODBConnection.py>>
>     > 
>     >     Julien
>     > 
> 
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