|By Daniel Thompson||
|February 5, 2013 12:35 PM EST||
A few weeks ago, on January 16, Divya Mehra and I have delivered a webinar on using the JBoss Data Grid for improving the scalability and performance of web applications. As expected, the webinar has elicited a lot of questions, not all of which could be answered in the allotted time. As they were really interesting though we are trying to answer them here, also for the benefit of a larger audience.
In our application we have WebSphere running and use JSF + Richfaces and Spring with Oracle 11g. Can JBoss Data Grid be integrated even if we do no use JBoss EAP?
Yes it can. You can use it in either mode: library or remote client-server.
Can data grid operations participate in a distributed transaction? If so, does it ensure that the commit occurs throughout a cluster? Will all nodes be updated?
Yes, JBoss Data Grid supports distributed transactions in both library and remote client-server mode. The nodes can be enlisted as XA resources. Changes will be propagated across the cluster, but are guaranteed to be propagated to all nodes by the end of the transaction only if the replication mode is synchronous. If the replication mode is asynchronous, there are no such guarantees, although the changes will be eventually replicated.
What usage statistics are available from JDG (e.g. cache hits / misses)? Does a UI for viewing these come with the product or is it just JMX data that the client application has to process?
The data collected from monitoring the JBoss Data Grid activity is available as JMX MBeans. It can be visualized using the JBoss Operations Network, included in the product, or with any other JMX tools and clients (jconsole, VisualVM).
Eventual consistency will be available only in V7.0? What happens now if remote distributed JDG nodes cannot communicate and replicate an update? Would the client hang in that case?
Eventual consistency refers to a weaker consistency model than the strong consistency model which is currently implemented by JBoss Data Grid, maximizing availability at the expense of consistency (refer to the CAP theorem for details). With the current strong consistency model, in the case of communication failure, the behaviour of the client will largely depend on the synchronization model chosen – in the case of synchronous replication, the client may block until the client times out (but never indefinitely). In the case of asynchronous replication it will return immediately (even if replication to other nodes isn’t complete yet). Since JBoss Data Grid currently focuses on a strong concurrency model, eventual consistency will be effectively a new feature of the framework, allowing to deal with the state being inconsistent across the cluster under the control of the framework (for example, a GET operation may involve examining all copies of the data and a quorum-based decision as to which is the correct one).
If I use JBoss Data Grid in Library Mode, how do I add a node concretely?
In Library mode, each application creates its own node, embedded in the application. If multiple deployments of the application exist (for example in a cluster environment), the nodes will communicate with each other.
Is there any way to delete or clear data from the JBoss Data Grid without having to restart it?
Sure, there is. Data can be removed explicitly through remove() or clear() operations in the application, and their equivalents in the command-line interface (CLI) available in JBoss Data Grid 6.1. Eviction and expiration strategies can be set up as well, for removing unused or stale data from the cache.
Is there a strategy for distributing data in the grid and somehow coordinating parallel work on that distributed data?
JBoss Data Grid will provide a distributed execution framework in JBoss Data Grid 6.1, which will provide a flexible framework for coordinating parallel work. Building on top of that, at a higher level, map/reduce capabilities will be available as well.
When you add additional data grid nodes, do you use distributed locking across nodes and, if so, what impact does that have to the performace of the data grid as more nodes are added?
JBoss Data Grid uses lazy remote locking by default, which reduces traffic. But generally speaking, in a data grid scenario, only a subset of the data is available on each node (and there is a limited number of replicas across the cluster), so the addition of new nodes does not necessarily result in an increase of the number of locks. It all depends on how many nodes the data is replicated. The impact of distributed locking can be further reduced if the grouping API is used, to group keys commonly updated together within a single transaction.
But the demo performance data of 20% improvement is based on an in-memory cache without remote calls compared to remote database calls. It’s not a fair comparison. What about a remote cache compared to a remote database?
We will try to produce more data to illustrate other scenarios. It should be noted, however, that JBoss Data Grid is an in-memory data grid by design. Also, while remote calls add to the overhead, the biggest cost in the type of scenario we envisioned comes from the more expensive IO operations elicited by the database access, as well as the reduced concurrency when locking data in the database.
Does the JBoss Data Grid API have a way to ask for all of the keys (across the cluster) — sort of a master index?
In JBoss Data Grid 6.1, this will be possible through a map-reduce operation.
I saw data being accessed using get/put. Do you use SQL or NoSQL to access data?
JBoss Data Grid uses a key-value pair model so access to data is similar to a map. However, other methods of searching for data, such as index-based querying and map-reduce will be available in JBoss Data Grid 6.1.
Does the data grid allow me to specify how many copies of a piece of data are created and distributed? If I have a 20 node cluster, can I request that it be replicated to 2 of the 20 for example?
Yes, the replication and distribution strategies are configurable.
The buzz continues for cloud, data analytics and the Internet of Things (IoT) and their collective impact across all industries. But a new conversation is emerging - how do companies use industry disruption and technology enablers to lead in markets undergoing change, uncertainty and ambiguity? Organizations of all sizes need to evolve and transform, often under massive pressure, as industry lines blur and merge and traditional business models are assaulted and turned upside down. In this new data-driven world, marketplaces reign supreme while interoperability, APIs and applications deliver un...
Oct. 9, 2015 08:00 AM EDT Reads: 285
Too often with compelling new technologies market participants become overly enamored with that attractiveness of the technology and neglect underlying business drivers. This tendency, what some call the “newest shiny object syndrome,” is understandable given that virtually all of us are heavily engaged in technology. But it is also mistaken. Without concrete business cases driving its deployment, IoT, like many other technologies before it, will fade into obscurity.
Oct. 9, 2015 08:00 AM EDT
Today air travel is a minefield of delays, hassles and customer disappointment. Airlines struggle to revitalize the experience. GE and M2Mi will demonstrate practical examples of how IoT solutions are helping airlines bring back personalization, reduce trip time and improve reliability. In their session at @ThingsExpo, Shyam Varan Nath, Principal Architect with GE, and Dr. Sarah Cooper, M2Mi's VP Business Development and Engineering, will explore the IoT cloud-based platform technologies driving this change including privacy controls, data transparency and integration of real time context w...
Oct. 9, 2015 07:30 AM EDT
"Matrix is an ambitious open standard and implementation that's set up to break down the fragmentation problems that exist in IP messaging and VoIP communication," explained John Woolf, Technical Evangelist at Matrix, in this SYS-CON.tv interview at @ThingsExpo, held Nov 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
Oct. 9, 2015 07:00 AM EDT Reads: 5,880
WebRTC converts the entire network into a ubiquitous communications cloud thereby connecting anytime, anywhere through any point. In his session at WebRTC Summit,, Mark Castleman, EIR at Bell Labs and Head of Future X Labs, will discuss how the transformational nature of communications is achieved through the democratizing force of WebRTC. WebRTC is doing for voice what HTML did for web content.
Oct. 9, 2015 06:00 AM EDT Reads: 1,411
The IoT is upon us, but today’s databases, built on 30-year-old math, require multiple platforms to create a single solution. Data demands of the IoT require Big Data systems that can handle ingest, transactions and analytics concurrently adapting to varied situations as they occur, with speed at scale. In his session at @ThingsExpo, Chad Jones, chief strategy officer at Deep Information Sciences, will look differently at IoT data so enterprises can fully leverage their IoT potential. He’ll share tips on how to speed up business initiatives, harness Big Data and remain one step ahead by apply...
Oct. 9, 2015 05:15 AM EDT Reads: 511
Nowadays, a large number of sensors and devices are connected to the network. Leading-edge IoT technologies integrate various types of sensor data to create a new value for several business decision scenarios. The transparent cloud is a model of a new IoT emergence service platform. Many service providers store and access various types of sensor data in order to create and find out new business values by integrating such data.
Oct. 9, 2015 04:00 AM EDT Reads: 570
The broad selection of hardware, the rapid evolution of operating systems and the time-to-market for mobile apps has been so rapid that new challenges for developers and engineers arise every day. Security, testing, hosting, and other metrics have to be considered through the process. In his session at Big Data Expo, Walter Maguire, Chief Field Technologist, HP Big Data Group, at Hewlett-Packard, will discuss the challenges faced by developers and a composite Big Data applications builder, focusing on how to help solve the problems that developers are continuously battling.
Oct. 9, 2015 04:00 AM EDT Reads: 500
There are so many tools and techniques for data analytics that even for a data scientist the choices, possible systems, and even the types of data can be daunting. In his session at @ThingsExpo, Chris Harrold, Global CTO for Big Data Solutions for EMC Corporation, will show how to perform a simple, but meaningful analysis of social sentiment data using freely available tools that take only minutes to download and install. Participants will get the download information, scripts, and complete end-to-end walkthrough of the analysis from start to finish. Participants will also be given the pract...
Oct. 9, 2015 03:00 AM EDT Reads: 293
WebRTC services have already permeated corporate communications in the form of videoconferencing solutions. However, WebRTC has the potential of going beyond and catalyzing a new class of services providing more than calls with capabilities such as mass-scale real-time media broadcasting, enriched and augmented video, person-to-machine and machine-to-machine communications. In his session at @ThingsExpo, Luis Lopez, CEO of Kurento, will introduce the technologies required for implementing these ideas and some early experiments performed in the Kurento open source software community in areas ...
Oct. 9, 2015 03:00 AM EDT Reads: 728
Internet of Things (IoT) will be a hybrid ecosystem of diverse devices and sensors collaborating with operational and enterprise systems to create the next big application. In their session at @ThingsExpo, Bramh Gupta, founder and CEO of robomq.io, and Fred Yatzeck, principal architect leading product development at robomq.io, discussed how choosing the right middleware and integration strategy from the get-go will enable IoT solution developers to adapt and grow with the industry, while at the same time reduce Time to Market (TTM) by using plug and play capabilities offered by a robust IoT ...
Oct. 9, 2015 02:00 AM EDT Reads: 2,220
Today’s connected world is moving from devices towards things, what this means is that by using increasingly low cost sensors embedded in devices we can create many new use cases. These span across use cases in cities, vehicles, home, offices, factories, retail environments, worksites, health, logistics, and health. These use cases rely on ubiquitous connectivity and generate massive amounts of data at scale. These technologies enable new business opportunities, ways to optimize and automate, along with new ways to engage with users.
Oct. 9, 2015 02:00 AM EDT Reads: 167
The Internet of Things (IoT) is growing rapidly by extending current technologies, products and networks. By 2020, Cisco estimates there will be 50 billion connected devices. Gartner has forecast revenues of over $300 billion, just to IoT suppliers. Now is the time to figure out how you’ll make money – not just create innovative products. With hundreds of new products and companies jumping into the IoT fray every month, there’s no shortage of innovation. Despite this, McKinsey/VisionMobile data shows "less than 10 percent of IoT developers are making enough to support a reasonably sized team....
Oct. 9, 2015 02:00 AM EDT Reads: 209
“In the past year we've seen a lot of stabilization of WebRTC. You can now use it in production with a far greater degree of certainty. A lot of the real developments in the past year have been in things like the data channel, which will enable a whole new type of application," explained Peter Dunkley, Technical Director at Acision, in this SYS-CON.tv interview at @ThingsExpo, held Nov 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
Oct. 9, 2015 01:45 AM EDT Reads: 7,028
Through WebRTC, audio and video communications are being embedded more easily than ever into applications, helping carriers, enterprises and independent software vendors deliver greater functionality to their end users. With today’s business world increasingly focused on outcomes, users’ growing calls for ease of use, and businesses craving smarter, tighter integration, what’s the next step in delivering a richer, more immersive experience? That richer, more fully integrated experience comes about through a Communications Platform as a Service which allows for messaging, screen sharing, video...
Oct. 9, 2015 12:00 AM EDT Reads: 1,135
SYS-CON Events announced today that Dyn, the worldwide leader in Internet Performance, will exhibit at SYS-CON's 17th International Cloud Expo®, which will take place on November 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA. Dyn is a cloud-based Internet Performance company. Dyn helps companies monitor, control, and optimize online infrastructure for an exceptional end-user experience. Through a world-class network and unrivaled, objective intelligence into Internet conditions, Dyn ensures traffic gets delivered faster, safer, and more reliably than ever.
Oct. 8, 2015 10:00 PM EDT Reads: 597
The IoT market is on track to hit $7.1 trillion in 2020. The reality is that only a handful of companies are ready for this massive demand. There are a lot of barriers, paint points, traps, and hidden roadblocks. How can we deal with these issues and challenges? The paradigm has changed. Old-style ad-hoc trial-and-error ways will certainly lead you to the dead end. What is mandatory is an overarching and adaptive approach to effectively handle the rapid changes and exponential growth.
Oct. 8, 2015 09:00 PM EDT Reads: 119
Mobile messaging has been a popular communication channel for more than 20 years. Finnish engineer Matti Makkonen invented the idea for SMS (Short Message Service) in 1984, making his vision a reality on December 3, 1992 by sending the first message ("Happy Christmas") from a PC to a cell phone. Since then, the technology has evolved immensely, from both a technology standpoint, and in our everyday uses for it. Originally used for person-to-person (P2P) communication, i.e., Sally sends a text message to Betty – mobile messaging now offers tremendous value to businesses for customer and empl...
Oct. 8, 2015 05:30 PM EDT Reads: 233
Can call centers hang up the phones for good? Intuitive Solutions did. WebRTC enabled this contact center provider to eliminate antiquated telephony and desktop phone infrastructure with a pure web-based solution, allowing them to expand beyond brick-and-mortar confines to a home-based agent model. It also ensured scalability and better service for customers, including MUY! Companies, one of the country's largest franchise restaurant companies with 232 Pizza Hut locations. This is one example of WebRTC adoption today, but the potential is limitless when powered by IoT.
Oct. 8, 2015 04:30 PM EDT Reads: 7,474
You have your devices and your data, but what about the rest of your Internet of Things story? Two popular classes of technologies that nicely handle the Big Data analytics for Internet of Things are Apache Hadoop and NoSQL. Hadoop is designed for parallelizing analytical work across many servers and is ideal for the massive data volumes you create with IoT devices. NoSQL databases such as Apache HBase are ideal for storing and retrieving IoT data as “time series data.”
Oct. 8, 2015 02:45 PM EDT Reads: 499