Welcome!

SAP HANA Cloud Authors: Dana Gardner, Elizabeth White, Liz McMillan, Craig Lowell, Pat Romanski

Blog Feed Post

Supercharge Your Web Applications Using JBoss Data Grid

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.

You can watch the webinar here and download it from here.

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.


Read the original blog entry...

More Stories By Daniel Thompson

I curate the content on this page, but the credit goes to my talented colleagues for the posts that you see here. Much of what you read on this page is the work of friends at How to JBoss, and I encourage you to drop by the site at http://www.howtojboss.com for some of the best JBoss technical and non-technical content for developers, architects and technology executives on the Web.

@ThingsExpo Stories
For basic one-to-one voice or video calling solutions, WebRTC has proven to be a very powerful technology. Although WebRTC’s core functionality is to provide secure, real-time p2p media streaming, leveraging native platform features and server-side components brings up new communication capabilities for web and native mobile applications, allowing for advanced multi-user use cases such as video broadcasting, conferencing, and media recording.
Data is the fuel that drives the machine learning algorithmic engines and ultimately provides the business value. In his session at Cloud Expo, Ed Featherston, a director and senior enterprise architect at Collaborative Consulting, will discuss the key considerations around quality, volume, timeliness, and pedigree that must be dealt with in order to properly fuel that engine.
SYS-CON Events announced today that 910Telecom will exhibit 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. Housed in the classic Denver Gas & Electric Building, 910 15th St., 910Telecom is a carrier-neutral telecom hotel located in the heart of Denver. Adjacent to CenturyLink, AT&T, and Denver Main, 910Telecom offers connectivity to all major carriers, Internet service providers, Internet backbones and ...
DevOps at Cloud Expo, taking place Nov 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 widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long dev...
Amazon has gradually rolled out parts of its IoT offerings in the last year, but these are just the tip of the iceberg. In addition to optimizing their back-end AWS offerings, Amazon is laying the ground work to be a major force in IoT – especially in the connected home and office. Amazon is extending its reach by building on its dominant Cloud IoT platform, its Dash Button strategy, recently announced Replenishment Services, the Echo/Alexa voice recognition control platform, the 6-7 strategic...
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...
Akana has announced the availability of version 8 of its API Management solution. The Akana Platform provides an end-to-end API Management solution for designing, implementing, securing, managing, monitoring, and publishing APIs. It is available as a SaaS platform, on-premises, and as a hybrid deployment. Version 8 introduces a lot of new functionality, all aimed at offering customers the richest API Management capabilities in a way that is easier than ever for API and app developers to use.
Personalization has long been the holy grail of marketing. Simply stated, communicate the most relevant offer to the right person and you will increase sales. To achieve this, you must understand the individual. Consequently, digital marketers developed many ways to gather and leverage customer information to deliver targeted experiences. In his session at @ThingsExpo, Lou Casal, Founder and Principal Consultant at Practicala, discussed how the Internet of Things (IoT) has accelerated our abil...
With so much going on in this space you could be forgiven for thinking you were always working with yesterday’s technologies. So much change, so quickly. What do you do if you have to build a solution from the ground up that is expected to live in the field for at least 5-10 years? This is the challenge we faced when we looked to refresh our existing 10-year-old custom hardware stack to measure the fullness of trash cans and compactors.
The emerging Internet of Everything creates tremendous new opportunities for customer engagement and business model innovation. However, enterprises must overcome a number of critical challenges to bring these new solutions to market. In his session at @ThingsExpo, Michael Martin, CTO/CIO at nfrastructure, outlined these key challenges and recommended approaches for overcoming them to achieve speed and agility in the design, development and implementation of Internet of Everything solutions wi...
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....
I wanted to gather all of my Internet of Things (IOT) blogs into a single blog (that I could later use with my University of San Francisco (USF) Big Data “MBA” course). However as I started to pull these blogs together, I realized that my IOT discussion lacked a vision; it lacked an end point towards which an organization could drive their IOT envisioning, proof of value, app dev, data engineering and data science efforts. And I think that the IOT end point is really quite simple…
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...
"My role is working with customers, helping them go through this digital transformation. I spend a lot of time talking to banks, big industries, manufacturers working through how they are integrating and transforming their IT platforms and moving them forward," explained William Morrish, General Manager Product Sales at Interoute, in this SYS-CON.tv interview at 18th Cloud Expo, held June 7-9, 2016, at the Javits Center in New York City, NY.
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.
Today we can collect lots and lots of performance data. We build beautiful dashboards and even have fancy query languages to access and transform the data. Still performance data is a secret language only a couple of people understand. The more business becomes digital the more stakeholders are interested in this data including how it relates to business. Some of these people have never used a monitoring tool before. They have a question on their mind like “How is my application doing” but no id...
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...
SYS-CON Events announced today that Venafi, the Immune System for the Internet™ and the leading provider of Next Generation Trust Protection, will exhibit at @DevOpsSummit at 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Venafi is the Immune System for the Internet™ that protects the foundation of all cybersecurity – cryptographic keys and digital certificates – so they can’t be misused by bad guys in attacks...
Smart Cities are here to stay, but for their promise to be delivered, the data they produce must not be put in new siloes. In his session at @ThingsExpo, Mathias Herberts, Co-founder and CTO of Cityzen Data, will deep dive into best practices that will ensure a successful smart city journey.
In today's uber-connected, consumer-centric, cloud-enabled, insights-driven, multi-device, global world, the focus of solutions has shifted from the product that is sold to the person who is buying the product or service. Enterprises have rebranded their business around the consumers of their products. The buyer is the person and the focus is not on the offering. The person is connected through multiple devices, wearables, at home, on the road, and in multiple locations, sometimes simultaneously...