Wednesday Apr 18, 2012
Tuesday Mar 15, 2011
By alexismp on Mar 15, 2011
This 8-minute video Mahesh introduces the problem domain (replication of stateful data) and how the replication was enhanced compared to the earlier 2.x family of products and also discusses how the GMS (Group Management System) has also been enhanced for better replication and failover.
The follow-up demonstration uses a four-instance cluster (on two machines), show the installation of the load-balancer, the deployment of an application, and exercising the failover after a node has been disappeared from the cluster.
This screencast is hosted on the GlassFish YouTube Channel.
By alexismp on Mar 15, 2011
John Clingan covers the clustering architecture changes with previous versions, the use of SSH, DAS (Domain Admin Server) scalability improvements, failover improvements with consistent hash algorithm for replicas and better performance, the new load-balancer configuration tool, and finally steps to deploy a highly-available application using the command line or the graphical admin. High availability of WS-ReliableMessaging and JMS services are also covered in this webinar.
Sunday Feb 07, 2010
By pelegri on Feb 07, 2010
The Sun-Oracle Strategy WebCast and subsequent Webcasts and Docs generated multiple comments and discussions threads in the Web from which I want to highlight a few comments in here. Please check the original posts for context, clarification and caveats.
On OSS licensing - "There are no plans to change the open source GlassFish licensing for any of the GlassFish modules that I am aware of as I work directly with the team right now in the integration process" (Mike Lehmann, Director of PM for WebLogic Server and GlassFish).
On clustering - "Clearly GlassFish 2.1 has clustering today and 3.0 currently does not. Customers depend on the GlassFish 2.1 implementation and as I have said on TSS we are committed to continue supporting it per our lifetime support policies" (ML).
More on clustering - "We are very much working with the team to assess how clustering will fit on the 3.x roadmap given it was already on the original 3.x roadmap - the ideal will be at least parity with 2.1 - so judge on the result when we deliver versus ahead of the plan" (ML).
Ultimately, all of these comments will need to be judged by the reality of what Oracle delivers. As I wrote at TSS, "The Proof of the Pudding is in the RoadMap". In that same thread, Mike writes: "You will have to judge us on how we execute over the next few months while we realign roadmaps and delivery schedules but I hope we can surprise folks with some good turns we can do as a combined company."
It is still very early in the process of integrating the GlassFish team into Oracle; remember that the two companies could not work together before CiC. Hopefully we will soon be able to give you more details.
Wednesday Oct 28, 2009
By pelegri on Oct 28, 2009
Today was the release of SailFin v2 (download, home, wiki) and its companion Sun GlassFish Communications Server 2.0 (download, home). SailFin v2 is a big release; it leverages GlassFish v2.1.1 (more tomorrow) and adds a number of features including high availability, rolling upgrade, flexible network topology, better overload protection, Diameter support, improved diagnosability, Java based DCR files for the load balancer, and more.
I can't cover SailFin v2 properly but I'll collect some of the relevant links so you can follow them up. Start with Binod's overview: SailFin v2 Released! and move from there:
Some of the major changes are:
- A new replica selection algorithm that improves scalability by easing load distribution after failure.
- Enhancements to the Converged Load Balancer to support writing DCR rules in Java.
- The ability to do rolling upgrades leverages session replication; see this example.
- Improved use of multihoming features for more flexible deployments. See Ramesh's writeup.
- Diameter support in Sun's for-fee AddOn; see details in Venu's many posts, including  and .
- Improved load protection. See Robert's one pager and Sankar's work on JMX Notification.
As part of the release, the team has posted a number of new entries, including:
- Next is what? (Prasad)
- Subscribing to user state using Sun Diameter Sh API (Venu)
- Setup and Configure Diameter on SailFin (Naman Mehta)
- Diameter Administration on SailFIn 2.0 (Yamini KB)
- SailFin v2 Released (Srikanth Anandal)
- CLB Enhancements in SailFin 2.0 (Kshitiz Saxena)
- Overload Protection in SailFin: What's new in 2.0 (Rampsarathy)
- Tips and Tricks of SailFin HA (Bhavani Shankar)
- Multihoming in SailFin. (Ramesh)
- TA entries tagged SailFin,
- Prasad's earlier roundup: "SailFin 2.0 is Around the Corner!"
- Sreeram's notes on SailFin amazon images.
- How to write Conference App in 15 lines of nicely formatted code!
Finally, a list for PR/Press reports:
Wednesday Oct 07, 2009
By Binod P G on Oct 07, 2009
Rolling upgrade is a necessary feature to avert system down time. Needless to say that it is very important for telco environments.
Session replication is used to prevent loss of sessions during rolling upgrade (and also in case of a failure). Sreedhar explains the new replica selection algorithm used in SailFin V2 and its benefits. Check it out!
Tuesday Sep 22, 2009
By Binod P G on Sep 22, 2009
Improving the clustering and high availability has been the focus of SailFin V2. Now, a new 3PCC (Third party call control) converged sample application demonstrating the session failover feature of sailfin has been integrated. The 3PCC sample has been written to follow the guidelines from RFC 3725.
Tuesday Sep 08, 2009
By pelegri on Sep 08, 2009
provides an overview and a
List of Fixes
Saturday Aug 29, 2009
By pelegri on Aug 29, 2009
Last month, John and Shreedhar gave a free webinar on High Availability through Load Balancing of GlassFish Clusters. The presentation was well attended, see posts from John and from an attendee, Daniel-Noz, and the recording of the webinar is now available.
And, if you are interested in this topic, also check out this White Paper Application Scalability and Fault Tolerance with GlassFish Load Balancer (and companion survey).
Saturday Nov 22, 2008
By pelegri on Nov 22, 2008
Clustering - supported in GlassFish since Sept 2007 - will be further improved in the GFv2.1 release (companion to SailFin). One of the improvements is Apache 2.2 support and Kshitiz has written an good writeup on the configuration steps and mentions the automated support also.
Clustering is used for horizontal scalability and high availability; interest and use of the feature is increasing quickly with GlassFish deployments. Check the official documentation and our recent White Paper on HA. Also, Satyajit just put together a set of slides on the topic (writeup, PDF@SLX, SlideShare).
We will cover Clustering in a future TA Online event; the Seam Online Event on Thursday went very well and I think the new format with multiple, shorter, presentations around a single topic is well suited to this new medium.
Saturday Nov 15, 2008
By pelegri on Nov 15, 2008
Sun has published a new White Paper showing how to combine the GlassFish Server with Solaris 10 Containers on Sun Fire T2000 servers to implement high available solutions under different topologies. The benefits of this arrangement includes benefits from the open source of GF as well as the manageability and price/performance and power-consumption/performance of Containers/CMT.
The White Paper is free but requires registration. The authors are from the core HA group at Sun.
Monday Dec 03, 2007
By pelegri on Dec 03, 2007
GlassFish has had mod_jk support since GFv1; a common use case is where Apache httpd server is serving static pages and delegating to GlassFish for dynamic content.
The any-day-now GFv2 UR1 release also supports the case where httpd works as a load balancer to a cluster of GF instances, and Jan's latest note describes in detail how this works out.
Jan's entry not just describes how to configure httpd and GF but it also includes an architectural overview, explaining how jvmRoute works in the load balancer scheme used by httpd as well as how it was implemented. Check it out!
Sunday Nov 11, 2007
By pelegri on Nov 11, 2007
The second entry is more advanced and covers High Availability in JMS. Linda talks about brokers, clusters, and stores in the OpenMQ implementation and points to the future directions for the project.
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