[infinispan-dev] Repeatable reads and WSC as default

[Dan Berindei]

I still think WSC should be enabled by default, but we probably missed
the 9.0 train.

I see the 8.0 discussion also included batching, i.e. hiding the WSC
options and forcing batching to use optimistic locking w/out WSC
(currently batching allows any locking type, but batch transactions
are isolated from external transactions). That would be at odds with
Sanne's suggestions in the "major version cleaning" thread, because
those would require a batch to join any external transaction.

Cheers
Dan


On Fri, Feb 24, 2017 at 3:53 PM, Radim Vansa <rvansa at redhat.com> wrote:
> Hi all,
>
> I am writing a bit too late in 9.0 cycle, but since I've found couple of
> bugs [1][2] and spaces for improvement [3][4] in WSC implementation, I
> was wondering about confirming the performance effect of fixes. And I am
> wondering if the current defaults for transactional cache, being
> READ_COMMITTED and WSC off are the best options.
>
> During 8.0 cycle Tristan raised a discussion [5] including WSC defaults
> and I think that the general opinion was "make it default", which
> requires RR isolation and simple versioning scheme. But I think that the
> whole thing [6] went a bit forgotten and all that was done is [7].
>
> Do we want to do this, at least using current API? (we most likely don't
> want to refactor ConfigurationBuilder when CR2 is out)
>
> Radim
>
> [1] https://issues.jboss.org/browse/ISPN-7526
> [2] https://issues.jboss.org/browse/ISPN-7527
> [3] https://issues.jboss.org/browse/ISPN-7528
> [4]
> https://github.com/infinispan/infinispan/blob/master/core/src/main/java/org/infinispan/container/entries/ClusteredRepeatableReadEntry.java#L30
> could be a contention point
> [5]
> http://infinispan.markmail.org/message/rasqqkojwdboql7y?q=write+skew+list:org%2Ejboss%2Elists%2Einfinispan-dev+order:date-backward
> [6] https://issues.jboss.org/browse/ISPN-3927
> [7] https://issues.jboss.org/browse/ISPN-7507
>
> --
> Radim Vansa <rvansa at redhat.com>
> JBoss Performance Team
>
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