[infinispan-dev] rehashing hazard

[Mircea Markus]

On 22 Oct 2010, at 15:17, Vladimir Blagojevic wrote:
> 
>>> 
>>> The operations that need to be sequential are state transfer and tx log transfer. 
>>> State is being *pulled* by C (thread running on C) and tx log is *pushed* by A (thread running on A). Two threads running in different VMs. 
>> 
>> Ok, this would be the issue then - this must have changed when Vladimir inverted the leave task to be a pull for the main state.  They both used to be pushes and sequential.
>> 
>> Perhaps the sequentiality can be re-established by a lock on the receiver?
> 
> Interested. What if C thread announce that it pulled state and upon reception of this message A drains the logs?

Is there any work that can be done in parallel? State transfer and log draining need to happen in sequence.
If not what's the point of using two threads? One thread approach would be more maintainable and simple. I emphasise _maintainable_ because I've just debugged logs of state transfer and it's not the nicest thing to do.
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