[infinispan-dev] Cross-site clustering

[Mircea Markus]

Cool, I'll implement Bela's suggestion for the next release: https://issues.jboss.org/browse/ISPN-2332


On 21 Sep 2012, at 17:06, Erik Salter wrote:

> I like Bela’s configuration.  Maybe take it a step further and allow a default backup configuration for all sites?   
the backup configuration is now inherited from the default site even now, or are you referring to something else?

>  
> FWIW, here’s my config.  I get warnings about looping back to the site, but it seems to work.
>  
>   <global>
>    
>     <sites local="${net.beaumaris.site.local:site1}">
>       <site name="${net.beaumaris.site.site01:site1}"/>
>       <site name="${net.beaumaris.site.site02:site2}"/>
>       <site name="${net.beaumaris.site.site03:site3}"/>
>     </sites>
>       …
>      <default>
>    
>     <sites>
>       <backups>      
>         <backup site="${net.beaumaris.site.site01:site1}" strategy="ASYNC"/>
>         <backup site="${net.beaumaris.site.site02:site2}" strategy="ASYNC"/>
>         <backup site="${net.beaumaris.site.site03:site3}" strategy="ASYNC"/>
>       </backups>
>     </sites>        
>  
> Erik
>  
> From: infinispan-dev-bounces at lists.jboss.org[mailto:infinispan-dev-bounces at lists.jboss.org] On Behalf OfMircea Markus
> Sent: Friday, September 21, 2012 8:36 AM
> To: infinispan -Dev List
> Subject: Re: [infinispan-dev] Cross-site clustering
>  
>  
> On 21 Sep 2012, at 15:13, Bela Ban wrote:
> 
> 
> Hi Mircea,
> 
> I'm in the process of setting up the Infinispan GUI demo across 3 data 
> centers, and I ran into an issue with the Infinispan config file. Not 
> really a bug, but something that could be improved.
> 
> Currently, the Infinispan config (let's call it infinispan.xml) defines 
> the sites and their backup sites and refers to the local JGroups cluster 
> config file (jgroups.xml). The latter has a RELAY2 protocol at the top 
> of its stack which points to the relay configuration (relay2.xml), which 
> defines the sites and how they connect to each other. Finally, there's a 
> jgroups-relay2.xml file (referred to from relay2.xml) which defines the 
> global bridge, connecting all 3 sites.
> 
> OK, so that 4 config files and I don't see how to reduce them. 
> However... currently infinispan.xml is *site-specific*, ie. we need 1 
> infinispan.xml for LON, 1 for SFO and 1 for NYC.
> 
> The 3 JGroups config files (jgroups.xml, relay2.xml and 
> relay2-bridge.xml) are *not* site-specific, ie. they can be used in any 
> site, provided that we set a few system properties, such as
> cluster-specific mcast address and port, and site name (relay2.xml).
> 
> I believe cross-site clustering would benefit from making infinispan.xml 
> symmetric as well, that is, we could use it in any site.
> 
> To do this, I suggest the following:
> 
> #1 Sites config:
>  <sites local="LON">
>             <site name="SFO"/>
>             <site name="NYC"/>
>             <site name="LON"/>
>         </sites>
> 
> 
> Nothing needs to be changed here, except to parameterize local: <sites 
> local="${SITE:LON}"...>. A node in a given site can then be started 
> using -DSITE=LON. This could also be used for relay2.xml.
> 
> - Question-1: why do we need to list the sites above ? We're not 
> defining any config for those sites, so I don't see why this is needed…
> yes, defining these sites is not required. The only thing that's needed is  
>  <sites local="LON">
> 
> 
> #2 Backups config:
>  <namedCache name="users">
>         <sites>
>             <backups>
>                 <backup site="NYC" backupFailurePolicy="WARN" 
> strategy="SYNC" timeout="12000"/>
>                 <backup site="SFO" backupFailurePolicy="IGNORE" 
> strategy="ASYNC"/>
>             </backups>
>         </sites>
>     </namedCache>
> 
> 
> This is *asymmetric*. IMO, a better config would be:
> 
> <global>
>   <sites>
>        <localSite="${site:LON}" backupSites="${backup-sites:SFO,NYC}" />
> This would require configuring "localSite" for all caches in the system. Unless added to the default cache and forbid an override. I'd prefer to keep it in the global, but don't really have a strong feeling about it.
>        <backups>
>                 <backup site="NYC" backupFailurePolicy="WARN" 
> strategy="SYNC" timeout="12000"/>
>                 <backup site="SFO" backupFailurePolicy="IGNORE" 
> strategy="ASYNC"/>
>                 <backup site="LON" backupFailurePolicy="IGNORE" 
> strategy="ASYNC"/>
>        </backups>
>    </sites>
> </global>
>  
> For me the above seems harder to read than the one currently in use, but otoh simplifying the config would be something nice.
> What do other think? Erik? 
>  
> 
> 
> Here, we define global backup strategies and the local site. Both of 
> them can be parameterized, e.g. we start up nodes in
> - LON: -Dsite=LON -DbackupSites="SFO,NYC"
> - SFO: -Dsite=SFO -DbackupSites=NYC
> - NYC: -Dsite=NYC -DbackupSites=     // no backups
> 
> 
> This would allow us to have only 1 infinispan.xml, regardless of the 
> site in which it is used.
> 
> Of course, since backup strageties are globally defined, if people 
> wanted different backup strategies per site (or per named cache), they 
> could still copy infinispan.xml and modify it...
> 
> WDYT ?
> 
> 
> 
> 
> -- 
> Bela Ban, JGroups lead (http://www.jgroups.org)
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>  
> Cheers,
> -- 
> Mircea Markus
> Infinispan lead (www.infinispan.org)
>  
>  
> 
>  
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Cheers,
-- 
Mircea Markus
Infinispan lead (www.infinispan.org)




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