Welcome!

Weblogic Authors: Yeshim Deniz, Elizabeth White, Michael Meiner, Michael Bushong, Avi Rosenthal

Related Topics: Weblogic

Weblogic: Article

Java Messaging Services Clustering Part 2

JMS clustered architectures, colloaction, and distributed load balancing

In Part 1 of this article series we discussed the fundamental aspects of clustering JMS resources in a WebLogic cluster. In Part 2 we will discuss JMS clustering in the context of design and configuration strategies that demonstrate how to create efficient JMS architectures.

Clustering Concepts
Enterprise applications come is a variety of sizes. For small-scale deployments, a J2EE application might be deployed on a single WebLogic server. Such a configuration, for example, would call for little consideration to the location of JMS and JDBC resources since clients that need to access those resources would, in most cases, reside on the same physical server. In contrast, mid- or large-scale J2EE deployments are most likely clustered across many physical servers to provide the application with high availability and load balancing capabilities. A clustered application, however, is more complex and network-demanding. Server instances in a cluster provide services to other server instances, sometimes across remote connections. It is important to consider the location of clients in an application cluster with respect to the resources they need to access. In some cases you may prefer to minimize remote connections by placing clients and resources on the same physical server; this is known as collocation. In other cases, however, you may want to distribute the work load among the physical servers in a cluster to utilize all available processing power; this is known as distributed load balancing.

The concept of collocation is important to consider in any clustered application. The idea behind collocation is simple: target your application server resources, such as JMS and JDBC, to physical server instances where clients are located and need access to those resources. For example, a JMS message producer first must find a connection factory, and then establish a connection to a JMS server for accessing a specific destination. If the JMS client uses a connection factory located on a remote server instance, a remote connection will be created. Additionally, if the connection factory and JMS server hosting the destination are located on separate physical servers, a remote JMS connection is created. While there is nothing preventing the JMS client from using remote connection factories and JMS resources, a more efficient approach is to collocate the JMS client with the connection factory and JMS resources it needs, thereby avoiding the use of remote connections and reducing network traffic.

With distributed load balancing, WebLogic allocates the work load to all server instances in the cluster to provide uniform use of available resources.

In a JMS cluster configuration, for example, messages sent to a distributed queue are load balanced among the destination members hosted by JMS servers on separate server instances. This approach helps to ensure accurate contribution of processing capacity from all physical servers in the cluster based on the preconfigured load balancing scheme for the distributed destination.

Collocation and distributed load balancing in the context of JMS are key concepts in this article. The next series of architectures illustrate different configurations and how they affect the behavior of clustered JMS applications.

Internal JMS Clients
Figure 1 illustrates a typical WebLogic cluster with distributed JMS resources. The cluster consists of three physical server instances. The WebLogic server instances each hosts its own JMS server with persistent file store (FS1, FS2, and FS3). A distributed queue (DQ) consists of two physical queue members, MQ1 and MQ2, which are deployed to WebLogic server instances 1 and 3, respectively. A connection factory (CF1) is targeted to the cluster making it available to each WebLogic server instance as a local JNDI object. The JMS clients, including message producers MP1, MP2, and message-driven beans MDB1, MDB2, reside on the WebLogic instances that host their desired destination, DQ.

Let's first look at the location of the connection factory, CF1. By targeting CF1 to the cluster, WebLogic first attempts to load balance consumers and producers on the same physical server instance. As depicted on WebLogic Servers 1 and 3, the JMS clients first connect locally to CF1. The connection factory then creates a JMS connection to the local JMS server on that WebLogic instance, connecting the clients with a local member destination of DQ. In this case, local JMS connections are created for the JMS clients.

It should be clear from Figure 1 that all JMS clients, including the connection factories, JMS servers, and distributed destination members, are collocated. This is ideal for WebLogic as it avoids the cost of load balancing across the remote member destinations of DQ while routing messages to collocated destinations instead.

To ensure WebLogic will first load balance locally, enable Server Affinity from the WebLogic Administration console for any connection factory collocated with JMS resources. In Figure 1, we enabled this option on CF1, and then targeted the connection factory to the entire cluster. Note that connection factories are clients to JMS servers, so it is good practice to collocate these types of administered objects as well, not just JMS producers and consumers.

WebLogic Server 2 does not host any queue members for DQ, so we don't target JMS clients to that server instance to avoid routing messages to remote destinations members. This architecture is suitable for systems that prefer increased performance at the cost of some distributed load balancing. This expense is attributed to the preference of local resources over remote resources. Even the persistent stores configured for the JMS servers use a local file resource. The file stores may be configured for superior performance by setting the Synchronous Write Policy to Disabled (configurable from the Administration console for each file store), which completes transactions once they are stored in memory. In terms of reliability, however, this is the least desirable policy, and is not recommended for applications that cannot afford to lose messages. The default policy Cache-Flush, which forces all writes to disk before transactions are complete, is a good trade-off between performance and transactional reliability.

External JMS Clients
The WebLogic cluster depicted in Figure 2 is similar to Figure 1, except here the message producers MP1, MP2, and MP3 are external JMS clients. These types of clients may represent batch processes executed throughout the day to perform specific message-based tasks. The connection factory CF1 is targeted to the cluster with Server Affinity enabled. The message-driven beans MDB1 and MDB2 connect with the collocated CF1 on their respective WebLogic server instances to access DQ without the need for remote JMS connections, just as in Figure 1.

The external JMS clients may also use CF1 to access DQ, but this may cause unnecessary remote connections and remote routing of message traffic. As depicted in the illustration, MP2 connects to CF1 on WebLogic Server 2. The connection factory must now connect MP2 with a physical queue member of DQ. Connection factory CF1 is enabled with Server Affinity, so it first attempts to connect MP2 with a local member destination of DQ. Since JMSServer2 does not host a collocated queue member, CF1 is forced to create a remote JMS connection to MQ1 on WebLogic Server 1, which effectively routes all message traffic from MP2 across that remote connection. This can create an undesirable network-intensive process if MP2 is generating hundreds, if not thousands, of messages per day, such as in a financial trading application that publishes stock prices nonstop to trader desks throughout the daily trading session.

More Stories By Raffi Basmajian

Raffi Basmajian works as an application architect for a major financial services firm in New York City. He specializes in architecting Java/J2EE distributed systems and integration frameworks. He can be reached at [email protected]

Comments (0)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


@ThingsExpo Stories
The 22nd International Cloud Expo | 1st DXWorld Expo has announced that its Call for Papers is open. Cloud Expo | DXWorld Expo, to be held June 5-7, 2018, at the Javits Center in New York, NY, brings together Cloud Computing, Digital Transformation, Big Data, Internet of Things, DevOps, Machine Learning and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding busin...
SYS-CON Events announced today that Synametrics Technologies will exhibit at SYS-CON's 22nd International Cloud Expo®, which will take place on June 5-7, 2018, at the Javits Center in New York, NY. Synametrics Technologies is a privately held company based in Plainsboro, New Jersey that has been providing solutions for the developer community since 1997. Based on the success of its initial product offerings such as WinSQL, Xeams, SynaMan and Syncrify, Synametrics continues to create and hone inn...
Smart cities have the potential to change our lives at so many levels for citizens: less pollution, reduced parking obstacles, better health, education and more energy savings. Real-time data streaming and the Internet of Things (IoT) possess the power to turn this vision into a reality. However, most organizations today are building their data infrastructure to focus solely on addressing immediate business needs vs. a platform capable of quickly adapting emerging technologies to address future ...
No hype cycles or predictions of a gazillion things here. IoT is here. You get it. You know your business and have great ideas for a business transformation strategy. What comes next? Time to make it happen. In his session at @ThingsExpo, Jay Mason, an Associate Partner of Analytics, IoT & Cybersecurity at M&S Consulting, presented a step-by-step plan to develop your technology implementation strategy. He also discussed the evaluation of communication standards and IoT messaging protocols, data...
Product connectivity goes hand and hand these days with increased use of personal data. New IoT devices are becoming more personalized than ever before. In his session at 22nd Cloud Expo | DXWorld Expo, Nicolas Fierro, CEO of MIMIR Blockchain Solutions, will discuss how in order to protect your data and privacy, IoT applications need to embrace Blockchain technology for a new level of product security never before seen - or needed.
In his session at 21st Cloud Expo, Raju Shreewastava, founder of Big Data Trunk, provided a fun and simple way to introduce Machine Leaning to anyone and everyone. He solved a machine learning problem and demonstrated an easy way to be able to do machine learning without even coding. Raju Shreewastava is the founder of Big Data Trunk (www.BigDataTrunk.com), a Big Data Training and consulting firm with offices in the United States. He previously led the data warehouse/business intelligence and B...
Cloud Expo | DXWorld Expo have announced the conference tracks for Cloud Expo 2018. Cloud Expo will be held June 5-7, 2018, at the Javits Center in New York City, and November 6-8, 2018, at the Santa Clara Convention Center, Santa Clara, CA. Digital Transformation (DX) is a major focus with the introduction of DX Expo within the program. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive ov...
A strange thing is happening along the way to the Internet of Things, namely far too many devices to work with and manage. It has become clear that we'll need much higher efficiency user experiences that can allow us to more easily and scalably work with the thousands of devices that will soon be in each of our lives. Enter the conversational interface revolution, combining bots we can literally talk with, gesture to, and even direct with our thoughts, with embedded artificial intelligence, whic...
"Evatronix provides design services to companies that need to integrate the IoT technology in their products but they don't necessarily have the expertise, knowledge and design team to do so," explained Adam Morawiec, VP of Business Development at Evatronix, in this SYS-CON.tv interview at @ThingsExpo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
Recently, REAN Cloud built a digital concierge for a North Carolina hospital that had observed that most patient call button questions were repetitive. In addition, the paper-based process used to measure patient health metrics was laborious, not in real-time and sometimes error-prone. In their session at 21st Cloud Expo, Sean Finnerty, Executive Director, Practice Lead, Health Care & Life Science at REAN Cloud, and Dr. S.P.T. Krishnan, Principal Architect at REAN Cloud, discussed how they built...
Digital Transformation (DX) is not a "one-size-fits all" strategy. Each organization needs to develop its own unique, long-term DX plan. It must do so by realizing that we now live in a data-driven age, and that technologies such as Cloud Computing, Big Data, the IoT, Cognitive Computing, and Blockchain are only tools. In her general session at 21st Cloud Expo, Rebecca Wanta explained how the strategy must focus on DX and include a commitment from top management to create great IT jobs, monitor ...
"Digital transformation - what we knew about it in the past has been redefined. Automation is going to play such a huge role in that because the culture, the technology, and the business operations are being shifted now," stated Brian Boeggeman, VP of Alliances & Partnerships at Ayehu, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
In his Opening Keynote at 21st Cloud Expo, John Considine, General Manager of IBM Cloud Infrastructure, led attendees through the exciting evolution of the cloud. He looked at this major disruption from the perspective of technology, business models, and what this means for enterprises of all sizes. John Considine is General Manager of Cloud Infrastructure Services at IBM. In that role he is responsible for leading IBM’s public cloud infrastructure including strategy, development, and offering m...
SYS-CON Events announced today that Evatronix will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Evatronix SA offers comprehensive solutions in the design and implementation of electronic systems, in CAD / CAM deployment, and also is a designer and manufacturer of advanced 3D scanners for professional applications.
To get the most out of their data, successful companies are not focusing on queries and data lakes, they are actively integrating analytics into their operations with a data-first application development approach. Real-time adjustments to improve revenues, reduce costs, or mitigate risk rely on applications that minimize latency on a variety of data sources. In his session at @BigDataExpo, Jack Norris, Senior Vice President, Data and Applications at MapR Technologies, reviewed best practices to ...
Recently, WebRTC has a lot of eyes from market. The use cases of WebRTC are expanding - video chat, online education, online health care etc. Not only for human-to-human communication, but also IoT use cases such as machine to human use cases can be seen recently. One of the typical use-case is remote camera monitoring. With WebRTC, people can have interoperability and flexibility for deploying monitoring service. However, the benefit of WebRTC for IoT is not only its convenience and interopera...
Nordstrom is transforming the way that they do business and the cloud is the key to enabling speed and hyper personalized customer experiences. In his session at 21st Cloud Expo, Ken Schow, VP of Engineering at Nordstrom, discussed some of the key learnings and common pitfalls of large enterprises moving to the cloud. This includes strategies around choosing a cloud provider(s), architecture, and lessons learned. In addition, he covered some of the best practices for structured team migration an...
With tough new regulations coming to Europe on data privacy in May 2018, Calligo will explain why in reality the effect is global and transforms how you consider critical data. EU GDPR fundamentally rewrites the rules for cloud, Big Data and IoT. In his session at 21st Cloud Expo, Adam Ryan, Vice President and General Manager EMEA at Calligo, examined the regulations and provided insight on how it affects technology, challenges the established rules and will usher in new levels of diligence arou...
22nd International Cloud Expo, taking place June 5-7, 2018, at the Javits Center in New York City, NY, and co-located with the 1st DXWorld Expo will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud ...
22nd International Cloud Expo, taking place June 5-7, 2018, at the Javits Center in New York City, NY, and co-located with the 1st DXWorld Expo will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud ...