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
Widespread fragmentation is stalling the growth of the IIoT and making it difficult for partners to work together. The number of software platforms, apps, hardware and connectivity standards is creating paralysis among businesses that are afraid of being locked into a solution. EdgeX Foundry is unifying the community around a common IoT edge framework and an ecosystem of interoperable components.
In his session at 21st Cloud Expo, Carl J. Levine, Senior Technical Evangelist for NS1, will objectively discuss how DNS is used to solve Digital Transformation challenges in large SaaS applications, CDNs, AdTech platforms, and other demanding use cases. Carl J. Levine is the Senior Technical Evangelist for NS1. A veteran of the Internet Infrastructure space, he has over a decade of experience with startups, networking protocols and Internet infrastructure, combined with the unique ability to it...
"MobiDev is a software development company and we do complex, custom software development for everybody from entrepreneurs to large enterprises," explained Alan Winters, U.S. Head of Business Development at MobiDev, 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.
"Space Monkey by Vivent Smart Home is a product that is a distributed cloud-based edge storage network. Vivent Smart Home, our parent company, is a smart home provider that places a lot of hard drives across homes in North America," explained JT Olds, Director of Engineering, and Brandon Crowfeather, Product Manager, at Vivint Smart Home, in this SYS-CON.tv interview at @ThingsExpo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
"IBM is really all in on blockchain. We take a look at sort of the history of blockchain ledger technologies. It started out with bitcoin, Ethereum, and IBM evaluated these particular blockchain technologies and found they were anonymous and permissionless and that many companies were looking for permissioned blockchain," stated René Bostic, Technical VP of the IBM Cloud Unit in North America, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Conventi...
"Akvelon is a software development company and we also provide consultancy services to folks who are looking to scale or accelerate their engineering roadmaps," explained Jeremiah Mothersell, Marketing Manager at Akvelon, 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.
Coca-Cola’s Google powered digital signage system lays the groundwork for a more valuable connection between Coke and its customers. Digital signs pair software with high-resolution displays so that a message can be changed instantly based on what the operator wants to communicate or sell. In their Day 3 Keynote at 21st Cloud Expo, Greg Chambers, Global Group Director, Digital Innovation, Coca-Cola, and Vidya Nagarajan, a Senior Product Manager at Google, discussed how from store operations and ...
Large industrial manufacturing organizations are adopting the agile principles of cloud software companies. The industrial manufacturing development process has not scaled over time. Now that design CAD teams are geographically distributed, centralizing their work is key. With large multi-gigabyte projects, outdated tools have stifled industrial team agility, time-to-market milestones, and impacted P&L stakeholders.
Gemini is Yahoo’s native and search advertising platform. To ensure the quality of a complex distributed system that spans multiple products and components and across various desktop websites and mobile app and web experiences – both Yahoo owned and operated and third-party syndication (supply), with complex interaction with more than a billion users and numerous advertisers globally (demand) – it becomes imperative to automate a set of end-to-end tests 24x7 to detect bugs and regression. In th...
"Cloud Academy is an enterprise training platform for the cloud, specifically public clouds. We offer guided learning experiences on AWS, Azure, Google Cloud and all the surrounding methodologies and technologies that you need to know and your teams need to know in order to leverage the full benefits of the cloud," explained Alex Brower, VP of Marketing at Cloud Academy, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clar...
"There's plenty of bandwidth out there but it's never in the right place. So what Cedexis does is uses data to work out the best pathways to get data from the origin to the person who wants to get it," explained Simon Jones, Evangelist and Head of Marketing at Cedexis, 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.
SYS-CON Events announced today that CrowdReviews.com has been named “Media Sponsor” of SYS-CON's 22nd International Cloud Expo, which will take place on June 5–7, 2018, at the Javits Center in New York City, NY. CrowdReviews.com is a transparent online platform for determining which products and services are the best based on the opinion of the crowd. The crowd consists of Internet users that have experienced products and services first-hand and have an interest in letting other potential buye...
SYS-CON Events announced today that Telecom Reseller has been named “Media Sponsor” of SYS-CON's 22nd International Cloud Expo, which will take place on June 5-7, 2018, at the Javits Center in New York, NY. Telecom Reseller reports on Unified Communications, UCaaS, BPaaS for enterprise and SMBs. They report extensively on both customer premises based solutions such as IP-PBX as well as cloud based and hosted platforms.
It is of utmost importance for the future success of WebRTC to ensure that interoperability is operational between web browsers and any WebRTC-compliant client. To be guaranteed as operational and effective, interoperability must be tested extensively by establishing WebRTC data and media connections between different web browsers running on different devices and operating systems. In his session at WebRTC Summit at @ThingsExpo, Dr. Alex Gouaillard, CEO and Founder of CoSMo Software, presented ...
WebRTC is great technology to build your own communication tools. It will be even more exciting experience it with advanced devices, such as a 360 Camera, 360 microphone, and a depth sensor camera. In his session at @ThingsExpo, Masashi Ganeko, a manager at INFOCOM Corporation, introduced two experimental projects from his team and what they learned from them. "Shotoku Tamago" uses the robot audition software HARK to track speakers in 360 video of a remote party. "Virtual Teleport" uses a multip...
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...
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.
Leading companies, from the Global Fortune 500 to the smallest companies, are adopting hybrid cloud as the path to business advantage. Hybrid cloud depends on cloud services and on-premises infrastructure working in unison. Successful implementations require new levels of data mobility, enabled by an automated and seamless flow across on-premises and cloud resources. In his general session at 21st Cloud Expo, Greg Tevis, an IBM Storage Software Technical Strategist and Customer Solution Architec...
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 ...
An increasing number of companies are creating products that combine data with analytical capabilities. Running interactive queries on Big Data requires complex architectures to store and query data effectively, typically involving data streams, an choosing efficient file format/database and multiple independent systems that are tied together through custom-engineered pipelines. In his session at @BigDataExpo at @ThingsExpo, Tomer Levi, a senior software engineer at Intel’s Advanced Analytics gr...