Certainly. This could be a solution. But the challenge is to have a
total decentralized system and a lus or a registry introduce a certain
degree of centralization.
I'm having a look at Shoal's code and JXTA api to understand how world
group can be used for the purpose.
Multicast port used by Shoal is fixed or changes from group to group?
Emanuele
Shreedhar Ganapathy wrote:
> One could think of a registry or a lookup service a la Jini or a UDDI
> registry or a JMX based MBean that exposes an API for retrieving a
> collection of such Shoal groups. At the simplest level these could
> just be a list of group names. But the important part is the protocol
> for group discovery.
>
> Shreedhar Ganapathy wrote:
>> Yes, we can expose a GMS API that will allow for a Uber entity for
>> viewing a collection of groups. Jxta has traditionally had the
>> advantage of being able to expose a compositional pattern of
>> peergroups whereby a WorldPeerGroup composes of one or more
>> infrastructure netpeergroups.
>> I am hoping this can be done through Jxta. I am not sure if Mo is
>> suggesting that GMS have a separate process of discovering all groups
>> in a subnet. That would be a lot of design and development work in
>> the GMS layer.
>>
>> Emanuele wrote:
>>> My application is addressed to highly dynamic and fully
>>> decentralized environments which impose a decentralized discovery
>>> mechanism. Moreover I think such a feature could be essential to
>>> enable self-organizing capabilities in these settings.
>>>
>>> Emanuele
>>>
>>> Mohamed Abdelaziz wrote:
>>>>
>>>>
>>>> I think the simplest way is to expose a GMS API which allows for
>>>> discovery of active clusters, which should be easy in the case of
>>>> local sub-nets. It's a little tricky when crossing the sub-net
>>>> boundries, which can be overcome by distributed queries cross
>>>> networks, thus enabling such in geographically distributed
>>>> clusters. Do you see a need for such feature in your application?
>>>>
>>>> Mohamed
>>>>
>>>> On Feb 15, 2008, at 5:07 PM, Emanuele <mane81_at_email.it> wrote:
>>>>
>>>>> Yes, something like that.
>>>>> I'll try to be more precise with an example: suppose there is a
>>>>> set of cluster in the system and clusters can be added and removed
>>>>> at runtime. Entities belonging to one cluster can move to another
>>>>> cluster according to some policies or rules. To support this sort
>>>>> of dynamism a way to find current active cluster is necessary.
>>>>>
>>>>> I think that I have to go deeper into JXTA api, but I would
>>>>> appreciate any useful hints because I'm really new to Jxta :)
>>>>>
>>>>> Emanuele
>>>>>
>>>>> Shreedhar Ganapathy wrote:
>>>>>> Does Jxta expose any api to query the world peer group for a
>>>>>> specific infrastructure netpeergroup by name ?
>>>>>>
>>>>>> I think something of that kind is what Emanuele is asking for.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Mohamed Abdelaziz wrote:
>>>>>>> Provided the cluster mcast port is known, discovery in world
>>>>>>> group could be employed to discover cluster instances, a
>>>>>>> functionality which could be exposed in shoal.
>>>>>>>
>>>>>>> Mohamed
>>>>>>>
>>>>>>> On Feb 15, 2008, at 2:14 PM, Shreedhar Ganapathy
>>>>>>> <Shreedhar.Ganapathy_at_Sun.COM> wrote:
>>>>>>>
>>>>>>>> I am sure Jxta has some way to determine that. We probably dont
>>>>>>>> know of it and hence Shoal Apis dont expose it. Would wait for
>>>>>>>> Mohamed's response on this.
>>>>>>>>
>>>>>>>> Emanuele wrote:
>>>>>>>>> Hi.
>>>>>>>>> If I don't know any group names, there is a way to find the
>>>>>>>>> clusters currently instantiated in my network?
>>>>>>>>> Thanks
>>>>>>>>>
>>>>>>>>> Emanuele
>>>>>>>>>
>>>>>>>>>
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