[silva-dev] Upgrade (to 0.9.3) hangs

[Reinhard Hess]

Martijn Faassen wrote:

> Benno Luthiger wrote:
> 
>> Dear Clemens and Martijn
>>
>> After increasing the cache size from 400 to 20000 (Target number of 
>> objects
>> in memory per cache), the whole upgrade went through smoothly.
>>
>>
>>> Benno, how big is this database?
>>
>>
>> Here are the numbers:
>>  Database Size: 21.4M
>>  Total number of objects in the database: 9972
> 
> 
> Curious, this is not a particularly large database -- we've upgraded 
> much, much larger databases to 0.9.3 in the past. You'd think we 
> wouldn't get over the cache size limit, or if so, that it wouldn't block 
> the whole process. Ugh..
> 
> Regards,
> 
> Martijn

Same experience here as well. This is a comparably small site. We did test upgrades with larger 
sites and  Max.Objects.in.Cache.per.thread=400 which did _not_ hang.
I thought about changing this number in our "Upgrade Engine" in the very beginning of the tests but 
decided to keep it to stay as close as possible to a default Zope installation. Which was obviously 
a good idea, because it revealed that there could be a problem in certain cases. I put a note 
concerning this into our README for the upgrades, even if usually production sites here run usually 
with a value than the (low) default.

Greetings,
Reinhard