[jbosscache-dev] Re: Non Blocking State Transfer Status (& Integration with JGroups)

[Bela Ban]

I'd do exactly the same; whether you do the copying in JGroups or user 
space results in the same amount of copying...

Once NIO2 gets implemented, with scattering/gathering writes/reads, this 
is a different story because we can then get rid of copies. That's going 
to take a while though...

Manik Surtani wrote:
>
> On 6 Jan 2009, at 22:05, Brian Stansberry wrote:
>
>>
>> BTW, is a *JGroups* streaming API necessary here?  The old AS Farm 
>> service passed arbitrary sized files by sending byte[] chunks via 
>> RpcDispatcher calls. Worked fine. That's not quite what JBC would 
>> need, since FarmService read a chunk from a FileInputStream and 
>> passed it to JGroups; you'd want an OutputStream impl that would pass 
>> a chunk to JGroups when it's internal buffer reached size X.
>
> This could be done but this would involve excessive copying of 
> buffers.  The whole purpose behind the JGroups streaming JIRA is to 
> optimise away such unnecessary buffer copying between layers.
>
> --
> Manik Surtani
> Lead, JBoss Cache
> http://www.jbosscache.org
> manik at jboss.org <mailto:manik at jboss.org>
>
>
>
>
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-- 
Bela Ban
Lead JGroups / Clustering Team
JBoss - a division of Red Hat