[Openfire-br] Introducing Hazelcast ... a new way to cluster Openfire!

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Marcelo Terres

Sent to you by mhterres via Google Reader: Introducing Hazelcast ... a
new way to cluster Openfire! via Blog Posts From Ignite Realtime Blog
Tagged With openfire by communityadmin at igniterealtime.org on 9/23/12

By Tom Evans



A few of you more intrepid Openfire fans may have noticed a bit of
recent activity in one of the branches of the Openfire SVN repository.
Well, some of your fellow developers have been working behind the
scenes to provide clustering support for PubSub, perhaps one of the
lesser-known modules of our beloved real-time collaboration server.
PubSub is an implementation of the XEP-0060 specification which extends
the XMPP standard to add publish-subscribe functionality to the XMPP
Core. However, if you have ever tried to use this module in Openfire,
you may have been disappointed to discover that it was not designed to
work in a clustered deployment. In fact, PubSub was forcibly disabled
when deployed in a cluster! The main focus of the development effort
was to address OF-205 and implement clustering support for the PubSub
module. This work is now complete and the PubSub module is
cluster-enabled and ready for action.



My Kingdom for a Cluster!



However, during the course of this development effort, the team also
took a critical look at the current clustering implementation itself
(the "clustering" plugin). This solution is currently the only way to
run Openfire in a clustered configuration (where multiple servers share
the load). Unfortunately this plugin is inextricably tied to Oracle
Coherence, an enterprise class (and enterprise priced) middleware
component. A recent quote from Oracle put the price of Coherence (EE)
at well over $300K for a smallish deployment ... clearly an untenable
solution and incompatible partnership with the Openfire project.



We looked around for clustering alternatives that would have better
affinity with Openfire, and landed with Hazelcast (Community Edition).
Hazelcast is an open source clustering and highly scalable data
distribution platform for Java. It enjoys a large deployment base and
is licensed under the community-friendly Apache 2.0 license. There are
also commercial licensing options available for deployments where
professional support and enterprise security (among other features) are
must-haves. This looked like a perfect fit for our needs, and likely
for the Openfire community as well.



Where Two or Three are Gathered...



We are pleased to annouce the immediate availabilty of a new
Hazelcast-based clustering plugin for Openfire. Starting today in the
trunk of the Openfire SVN repository you will find the new plugin
(/src/plugins/hazelcast/). Note that you will need to also setup the
latest version of the Openfire core (currently 3.7.2-Beta) to use the
new plugin.



We are looking for a few brave Openfire afficionados who can take the
latest build and give it a whirl with your various deployment scenarios:

- How many users and/or cluster member nodes do you have?
- Which modules/components of Openfire are you using?
- What is your typical JVM configuration? Preferred OS? Network
topology (load balancer, LAN/WAN, etc.)?
Your feedback is very important and will help ensure that this new
clustering solution will be a robust and stable component in the next
Openfire release.



Those who have wrestled with the existing clustering plugin will
hopefully find the new solution to be much simpler to configure and
deploy ... and certainly much lower cost! There is a README file
included with the new Hazelcast plugin that documents the basic steps
for setting up an Openfire cluster, including links to the supporting
Hazelcast documentation (if needed).



Testing ... Testing ... Is this thing on?



Please take the new build for a spin and report your feedback here. We
will be posting an article to the main community page before long, but
would love to have some initial feedback from the core developers
before engaging a wider audience. No doubt there will be some bugs and
configuration glitches ... can you help us find and fix them?



Thanks in advance for your consideration and assistance.

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