[infinispan-dev] Write Skew issue (versioning)

[Manik Surtani]

I'm taking a look - started a discussion on the forums.  :)

On 27 Jan 2012, at 16:44, Mircea Markus wrote:

> Looks like a bug, mind creating a JIRA for it?
> 
> On 24 Jan 2012, at 21:45, Pedro Ruivo wrote:
>> Hi,
>> 
>> yes I have the versioning enabled. Like you said, I've posted in the forum too [1].
>> 
>> btw, the ISPN config is here [2]
>> 
>> [1] -- https://community.jboss.org/thread/177846
>> [2] -- http://pastebin.com/UCxGXw3K
>> 
>> Cheers,
>> Pedro
>> 
>> On 24-01-2012 19:15, Mircea Markus wrote:
>>> 
>>> Hi Pedro and thanks for reporting this.
>>> Do you have versioning enabled? Otherwise the writeSkewCheck won't be performed at commit time. 
>>> If you do have versioning enabled, may I suggest to take this on the user forums[1] - this way it would be easier for other users that have the same problem to find it.
>>> 
>>> [1] https://community.jboss.org/community/infinispan?view=discussions&start=0
>>> 
>>> On 24 Jan 2012, at 18:42, Pedro Ruivo wrote:
>>>> Hi,
>>>> 
>>>> I think I have spotted a problem with the write skew check 
>>>> implementation based on versioning.
>>>> 
>>>> I've made this test to confirm:
>>>> 
>>>> I have a global counter that is incremented concurrently by two 
>>>> different nodes, running ISPN with Repeatable Read with write skew 
>>>> enabled. I expected that each successfully transaction will commit a 
>>>> different value.
>>>> 
>>>> In detail, each node do the following:
>>>> 
>>>> beginTx
>>>> Integer count = cache.get("counter");
>>>> count = count + 1;
>>>> cache.put("counter", count)
>>>> commitTx
>>>> 
>>>> To avoid errors, I've run this test on two ISPN versions: 5.1.0.CR4 and 
>>>> 5.0.1.Final. In 5.0.1.Final, it works as expected. However, on 5.1.0.CR4 
>>>> I have a lot of repeated values. After a first check at the code, I've 
>>>> the impression that the problem may be due to that the version numbers 
>>>> of the keys for which the write skew check should be run is not sent 
>>>> with the prepare command.
>>>> 
>>>> Cheers,
>>>> Pedro Ruivo
>>>> _______________________________________________
>>>> infinispan-dev mailing list
>>>> infinispan-dev at lists.jboss.org
>>>> https://lists.jboss.org/mailman/listinfo/infinispan-dev
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> infinispan-dev mailing list
>>> infinispan-dev at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/infinispan-dev
>> _______________________________________________
>> infinispan-dev mailing list
>> infinispan-dev at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/infinispan-dev
> 
> _______________________________________________
> infinispan-dev mailing list
> infinispan-dev at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/infinispan-dev

--
Manik Surtani
manik at jboss.org
twitter.com/maniksurtani

Lead, Infinispan
http://www.infinispan.org



-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/infinispan-dev/attachments/20120127/6cca9e06/attachment.html