Re: strange exception

On Fri, Dec 23, 2016 at 12:42 AM, Sanjay Rao <[email protected]>
wrote:

> My zope application is a multi-node application. Each node has two
> databases.
> - One local file based database for some local storage. This does not
> create any exception.
> - One centralised database running on ZEO. (For this I maintain one global
> database connection across all threads). This connection is protected by a
> global lock.
>

OK, that is likely part of the failure, although it's hard to say.  Don't
do this, it's too hard to do this correctly.



>
> Same thread can make changes in both databases, but in separate
> transactions. Application does not cause any consistency issues because
> both databases have independent information from each other.
>
> When I keep number of threads about 15 then exception was not observed,
> but if i increase number of threads to 30 then it was observed
> consistently. Once this exception occurs then it keep happening until not
> restarted.
>
> Do you need some more information to understand ?
>

No. I have enough. Don't do what you're doing.  The fact that the problem
happens as you add more threads should be a strong indicator that your
approach is flawed.

Jim

-- 
Jim Fulton
http://jimfulton.info

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