[infinispan-dev] rethinking ISPN transactions

[Mircea Markus]

On Nov 29, 2013, at 1:45 PM, Mark Little <mlittle at redhat.com> wrote:

> I haven't looked at how ISPN does this today, but here are some thoughts given how we do this within the transaction system for ACID transactions:
> 
> (i) have you considered async prepare?

There is a certain degree of asynchronicity in the sense that the prepare we send happens in parallel on all the nodes involved in the transaction. Is this what you have in mind? 

> 
> (ii) async commit/rollback could involve an external audit component to capture the outcome of the transaction, which can be inspected later. Many years ago the OTS and CORBA Notification Service did this together.

If the commit/rollback fails this should be picked up by the TM recovery process - I guess that would do the job. 
This improves the throughput indeed, but might be confusing for users: reading the data written by a "successfully" completed transaction (i.e. TM.commit() returns without exception) would not work.

> 
> (iii) if you don't allow heuristics then there are guarantees with async commit/rollback.
> 
> Mark.
> 
> 
> On 8 Nov 2013, at 15:28, Mircea Markus wrote:
> 
>> 1. Async options for commit/rollback
>> - they don't really make sense as a user you don't get any guarantee on the status of the transaction
>> - they complicate the code significantly
>> - I think they should be removed
> 
> ---
> Mark Little
> mlittle at redhat.com
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Cheers,
-- 
Mircea Markus
Infinispan lead (www.infinispan.org)