9:58 a.m.
Hi Galder,
Let me try to clarify this. With Diego we have developed a system for
forecasting the performance (e.g. maximum throughput, abort rate, avg.
transaction execution time) of an ISPN application when it is deployed
on a cluster of a different scale (compared to the current one).
We modelled using analytical techniques and machine learning the locking
and network-related behaviors of ISPN, but we did our work on ISPN 5.0
(replication mode), which used this "hybrid", partially local/partially
remote (and distributed=> no primary owner).
In other words, our performance prediction schemes won't work neither
for Optimistic nor for Pessimistic. That's why we were hoping there was
a way to revive that locking strategy on 5.2.
BTW, we're trying to see how much time it would take us to build a new
performance forecasting model capturing the 5.2 dynamics.... wish us
good luck because we will need it ready in 15 days....
Cheers,
Paolo
On 5/15/12 9:57 AM, Diego Didona wrote:
Hello again,
I need this behaviour because I have a piece of software which
relies on the knowledge of ISPN's locking scheme and it is *explicitly*
tailored for the locking scheme of ISPN 5.0; now I have to move to ISPN
5.2 so I just wanted to know if there is any chance of having my
previous software working with 5.2.
Thanks.
Regards,
Diego
> On May 14, 2012, at 5:53 PM, Diego Didona wrote:
>
>> Thanks Galder,
>> I am reading again the documentation you linked and I am also running
>> some simple tests but I see this behaviour:
>> - with OPTIMISTIC mode the lock is acquired *only* at prepare time
>> (thus *not* like in ISPN 5.0);
>> - with PESSIMISTIC mode the lock is acquired at encounter time on the
>> primary node (again, thus *not* like in ISPN 5.0).
>>
>> The behaviour I'm looking for is only-local encounter-time
>> locking + cluster-wide prepare-time locking.
> I can see what you mean by differences now, but why do you need this behaivour?
>
> What is your use case? IOW, what is the problem that you're having that requires
you to get local locks first?
>
>> Am I missing something?
>> Thanks again. Regards,
>> Diego
>>> That's already possible, seehttps://docs.jboss.org/author/x/FAY5
>>>
>>> Btw, the community wikis, like the one pointed below, are now used as design
documents. For the user guide, head tohttps://docs.jboss.org/author/display/ISPN.
>>>
>>> Cheers,
>>>
>>> On May 4, 2012, at 5:08 PM, Diego Didona wrote:
>>>
>>>> Hello,
>>>> looking at the code of ISPN 5.2 (and 5.1) I have seen that the
>>>> LockingIntercetor has been replaced with new ones. I would like to know
>>>> if there is the possibility to have ISPN 5.2 (or 5.1) working with the
>>>> *same* hybrid locking scheme described in [1], which was the default
>>>> till ISPN 5.0 and entailed the encounter-time write-locks acquisition
>>>> during the "local" execution of a transaction and then their
remote
>>>> acquisition on other nodes at prepare time.
>>>> Of course I would like to know if this is feasible just by tweaking some
>>>> configuration parameters, without having to modify the source code.
>>>> Thanks,
>>>> Diego
>>>> ------------------------
>>>> [1]https://community.jboss.org/wiki/OptimisticLockingInInfinispan
>>>> _______________________________________________
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>>> --
>>> Galder Zamarreño
>>> Sr. Software Engineer
>>> Infinispan, JBoss Cache
>>>
>>>
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> --
> Galder Zamarreño
> Sr. Software Engineer
> Infinispan, JBoss Cache
>
>
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