[infinispan-dev] DIST and putAll calls

[Manik Surtani]

On 8 Jul 2009, at 16:13, Galder Zamarreno wrote:

> Hi,
>
> Re: https://jira.jboss.org/jira/browse/ISPN-120
>
> While looking at this, I've started thinking how DIST dealt with  
> putAll() calls. It looks, based on  
> MultipleKeysRecipientGenerator.generateRecipients() that there's a  
> union made of all the recipients for all the keys in the putAll().  
> Is that how's that supposed to work?
>
> Theoretically, it looks to me there should be a put op called for  
> each of the keys but obviously, doing the current way is more  
> performant in spite of creating more copies in the cluster than the  
> number of owners set.

Well there will always be a tradeoff.  And that tradeoff will depend  
on a number of factors, including the size of the map passed to putAll  
and the degree of overlap in entry colocation.  If we know we have a  
low degree of overlap it may make sense to break up the map; but if  
the map is small it may be cheaper/quicker to just let everyone have  
the map and discard what they don't need.

Cheers
--
Manik Surtani
manik at jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
http://www.jbosscache.org