|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 cloud market growth today is largely in public clouds. While there is a lot of spend in IT departments in virtualization, these aren’t yet translating into a true “cloud” experience within the enterprise. What is stopping the growth of the “private cloud” market? In his general session at 18th Cloud Expo, Nara Rajagopalan, CEO of Accelerite, explored the challenges in deploying, managing, and getting adoption for a private cloud within an enterprise. What are the key differences between wh...
Jun. 26, 2016 01:00 PM EDT Reads: 692
It is one thing to build single industrial IoT applications, but what will it take to build the Smart Cities and truly society changing applications of the future? The technology won’t be the problem, it will be the number of parties that need to work together and be aligned in their motivation to succeed. In his Day 2 Keynote at @ThingsExpo, Henrik Kenani Dahlgren, Portfolio Marketing Manager at Ericsson, discussed how to plan to cooperate, partner, and form lasting all-star teams to change t...
Jun. 26, 2016 12:30 PM EDT Reads: 1,089
There is little doubt that Big Data solutions will have an increasing role in the Enterprise IT mainstream over time. Big Data at Cloud Expo - to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA - has announced its Call for Papers is open. Cloud computing is being adopted in one form or another by 94% of enterprises today. Tens of billions of new devices are being connected to The Internet of Things. And Big Data is driving this bus. An exponential increase is...
Jun. 26, 2016 12:00 PM EDT Reads: 1,311
In his general session at 18th Cloud Expo, Lee Atchison, Principal Cloud Architect and Advocate at New Relic, discussed cloud as a ‘better data center’ and how it adds new capacity (faster) and improves application availability (redundancy). The cloud is a ‘Dynamic Tool for Dynamic Apps’ and resource allocation is an integral part of your application architecture, so use only the resources you need and allocate /de-allocate resources on the fly.
Jun. 26, 2016 12:00 PM EDT Reads: 1,040
The 19th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Digital Transformation, Microservices 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 business opportuni...
Jun. 26, 2016 12:00 PM EDT Reads: 1,256
Internet of @ThingsExpo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with the 19th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world and ThingsExpo Silicon Valley Call for Papers is now open.
Jun. 26, 2016 12:00 PM EDT Reads: 1,092
In his keynote at 18th Cloud Expo, Andrew Keys, Co-Founder of ConsenSys Enterprise, provided an overview of the evolution of the Internet and the Database and the future of their combination – the Blockchain. Andrew Keys is Co-Founder of ConsenSys Enterprise. He comes to ConsenSys Enterprise with capital markets, technology and entrepreneurial experience. Previously, he worked for UBS investment bank in equities analysis. Later, he was responsible for the creation and distribution of life sett...
Jun. 26, 2016 11:00 AM EDT Reads: 1,021
Machine Learning helps make complex systems more efficient. By applying advanced Machine Learning techniques such as Cognitive Fingerprinting, wind project operators can utilize these tools to learn from collected data, detect regular patterns, and optimize their own operations. In his session at 18th Cloud Expo, Stuart Gillen, Director of Business Development at SparkCognition, discussed how research has demonstrated the value of Machine Learning in delivering next generation analytics to imp...
Jun. 26, 2016 09:45 AM EDT Reads: 542
There are several IoTs: the Industrial Internet, Consumer Wearables, Wearables and Healthcare, Supply Chains, and the movement toward Smart Grids, Cities, Regions, and Nations. There are competing communications standards every step of the way, a bewildering array of sensors and devices, and an entire world of competing data analytics platforms. To some this appears to be chaos. In this power panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, Bradley Holt, Developer Advocate a...
Jun. 26, 2016 08:45 AM EDT Reads: 696
Cognitive Computing is becoming the foundation for a new generation of solutions that have the potential to transform business. Unlike traditional approaches to building solutions, a cognitive computing approach allows the data to help determine the way applications are designed. This contrasts with conventional software development that begins with defining logic based on the current way a business operates. In her session at 18th Cloud Expo, Judith S. Hurwitz, President and CEO of Hurwitz & ...
Jun. 25, 2016 03:00 PM EDT Reads: 1,555
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, wh...
Jun. 25, 2016 01:45 PM EDT Reads: 892
19th Cloud Expo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, 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 strategy. Meanwhile, 94% of enterpri...
Jun. 25, 2016 01:15 PM EDT Reads: 1,233
SYS-CON Events announced today that Bsquare has been named “Silver Sponsor” of SYS-CON's @ThingsExpo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. For more than two decades, Bsquare has helped its customers extract business value from a broad array of physical assets by making them intelligent, connecting them, and using the data they generate to optimize business processes.
Jun. 25, 2016 11:45 AM EDT Reads: 1,181
Internet of @ThingsExpo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 19th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The Internet of Things (IoT) is the most profound change in personal and enterprise IT since the creation of the Worldwide Web more than 20 years ago. All major researchers estimate there will be tens of billions devices - comp...
Jun. 25, 2016 11:15 AM EDT Reads: 1,201
Cloud computing is being adopted in one form or another by 94% of enterprises today. Tens of billions of new devices are being connected to The Internet of Things. And Big Data is driving this bus. An exponential increase is expected in the amount of information being processed, managed, analyzed, and acted upon by enterprise IT. This amazing is not part of some distant future - it is happening today. One report shows a 650% increase in enterprise data by 2020. Other estimates are even higher....
Jun. 25, 2016 10:15 AM EDT Reads: 1,264
Connected devices and the industrial internet are growing exponentially every year with Cisco expecting 50 billion devices to be in operation by 2020. In this period of growth, location-based insights are becoming invaluable to many businesses as they adopt new connected technologies. Knowing when and where these devices connect from is critical for a number of scenarios in supply chain management, disaster management, emergency response, M2M, location marketing and more. In his session at @Th...
Jun. 25, 2016 07:30 AM EDT Reads: 898
SYS-CON Events announced today that ReadyTalk, a leading provider of online conferencing and webinar services, has been named Vendor Presentation Sponsor at the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. ReadyTalk delivers audio and web conferencing services that inspire collaboration and enable the Future of Work for today’s increasingly digital and mobile workforce. By combining intuitive, innovative tec...
Jun. 24, 2016 01:00 PM EDT Reads: 1,339
Amazon has gradually rolled out parts of its IoT offerings, but these are just the tip of the iceberg. In addition to optimizing their backend AWS offerings, Amazon is laying the ground work to be a major force in IoT - especially in the connected home and office. In his session at @ThingsExpo, Chris Kocher, founder and managing director of Grey Heron, explained how Amazon is extending its reach to become a major force in IoT by building on its dominant cloud IoT platform, its Dash Button strat...
Jun. 24, 2016 12:00 PM EDT Reads: 1,603
industrial company for a multi-year contract initially valued at over $4.0 million. In addition to DataV software, Bsquare will also provide comprehensive systems integration, support and maintenance services. DataV leverages advanced data analytics, predictive reasoning, data-driven diagnostics, and automated orchestration of remediation actions in order to improve asset uptime while reducing service and warranty costs.
Jun. 22, 2016 11:00 AM EDT Reads: 1,358
Vidyo, Inc., has joined the Alliance for Open Media. The Alliance for Open Media is a non-profit organization working to define and develop media technologies that address the need for an open standard for video compression and delivery over the web. As a member of the Alliance, Vidyo will collaborate with industry leaders in pursuit of an open and royalty-free AOMedia Video codec, AV1. Vidyo’s contributions to the organization will bring to bear its long history of expertise in codec technolo...
Jun. 19, 2016 12:45 PM EDT Reads: 1,249