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From Kiran Ayyagari <>
Subject Re: [Mitosis] ADS cluster management
Date Fri, 16 Jan 2009 19:53:53 GMT
hi Alex,

Alex Karasulu wrote:
> I've thought about using these kinds of generalized frameworks to help 
> piece together various aspects of the LDAP replication system. At 
> various stages I thought that these toolkits may be as you thought 
> heavy.

yep they are in one way or the other w.r.t our requirement
> In most cases, I felt that they were hard to fashion into 
> something LDAP specific.  I've always felt like you have to create the 
> message transport layer and directly implement the group management 
> since it was defined by the replication agreement.
I would say *yes* we may have to go for this, having spent much time with ActiveMQ
and River/Jini to see how we can fit either of these into the replication system here are
some observations

We can use ActiveMQ's 'Network of Brokers' feature to automatically discover the other ADS
but its usage ends there rest of the crucial things related to replication we need to manage
as usual,
but on ActiveMQ channel. In this case IMHO we don't gain much by using ActiveMQ, in addition
to that
securing these ActiveMQ channel(s) is another issue.

In order to use River/Jini it seems to be too much of a burden to set up the system, for that
to run we need to setup
security permissions for the code base (and/or) we need to keep the code in a 'http server'
!!! and security manager

> Also I think there's something like this out there used by JINI: 
> Javaspaces I think.  FYI JINI is now an Apache project called River I 
> think so the code should be there.
> Cheers,
> Alex

Kiran Ayyagari

> On Tue, Jan 13, 2009 at 9:13 AM, ayyagarikiran < 
> <>> wrote:
>     hi Guys,
>       Am currently looking for a framework/toolkit which provides
>     reliable network management I mean group management, node
>       election etc. including application level message transfer.
>       To put it in a simple way, a process group communication toolkit
>     like JGroups ( (it is licensed
>       under LGPL, so we cannot use it)
>       This is for managing the network nodes present in a ADS Multi
>     Master Replication System
>       One idea is to use ActiveMQ with it 'Network of Brokers' feature.
>     IMO this might be heavy with all the JMS thingy but
>       am still evaluating the feasibility of using ActiveMQ.
>       And another one I have come across is
>     ZooKeeper(
>      from the web site
>       <snip>
>       ZooKeeper is a high-performance coordination service for
>     distributed applications. It exposes common services - such
>       as naming, configuration management, synchronization, and group
>     services - in a simple interface so you don't have to
>       write them from scratch. You can use it off-the-shelf to implement
>     consensus, group management, leader election, and
>       presence protocols. And you can build on it for your own, specific
>     needs.
>       <snip>
>       did any one use it before? or do you have any other suggestions.
>       As am still trying for a possible solution, I think this is the
>     right time to ask for your suggestions.
>     I appreciate your time :)
>     Kiran Ayyagari

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