|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 world's leading Cloud event, Cloud Expo has launched Microservices Journal on the SYS-CON.com portal, featuring over 19,000 original articles, news stories, features, and blog entries. DevOps Journal is focused on this critical enterprise IT topic in the world of cloud computing. Microservices Journal offers top articles, news stories, and blog posts from the world's well-known experts and guarantees better exposure for its authors than any other publication. Follow new article posts on Twitter at @MicroservicesE
Mar. 31, 2015 12:00 PM EDT Reads: 1,539
SYS-CON Events announced today that Litmus Automation will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Litmus Automation’s vision is to provide a solution for companies that are in a rush to embrace the disruptive Internet of Things technology and leverage it for real business challenges. Litmus Automation simplifies the complexity of connected devices applications with Loop, a secure and scalable cloud platform.
Mar. 31, 2015 12:00 PM EDT Reads: 500
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, will discuss 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 I...
Mar. 31, 2015 11:46 AM EDT Reads: 368
SYS-CON Events announced today the IoT Bootcamp – Jumpstart Your IoT Strategy, being held June 9–10, 2015, in conjunction with 16th Cloud Expo and Internet of @ThingsExpo at the Javits Center in New York City. This is your chance to jumpstart your IoT strategy. Combined with real-world scenarios and use cases, the IoT Bootcamp is not just based on presentations but includes hands-on demos and walkthroughs. We will introduce you to a variety of Do-It-Yourself IoT platforms including Arduino, Raspberry Pi, BeagleBone, Spark and Intel Edison. You will also get an overview of cloud technologies s...
Mar. 31, 2015 11:00 AM EDT Reads: 2,205
Containers and microservices have become topics of intense interest throughout the cloud developer and enterprise IT communities. Accordingly, attendees at the upcoming 16th Cloud Expo at the Javits Center in New York June 9-11 will find fresh new content in a new track called PaaS | Containers & Microservices Containers are not being considered for the first time by the cloud community, but a current era of re-consideration has pushed them to the top of the cloud agenda. With the launch of Docker's initial release in March of 2013, interest was revved up several notches. Then late last...
Mar. 31, 2015 09:15 AM EDT Reads: 2,284
The WebRTC Summit 2014 New York, to be held June 9-11, 2015, at the Javits Center in New York, NY, announces that its Call for Papers is open. Topics include all aspects of improving IT delivery by eliminating waste through automated business models leveraging cloud technologies. WebRTC Summit is co-located with 16th International Cloud Expo, @ThingsExpo, Big Data Expo, and DevOps Summit.
Mar. 31, 2015 09:00 AM EDT Reads: 1,686
SOA Software has changed its name to Akana. With roots in Web Services and SOA Governance, Akana has established itself as a leader in API Management and is expanding into cloud integration as an alternative to the traditional heavyweight enterprise service bus (ESB). The company recently announced that it achieved more than 90% year-over-year growth. As Akana, the company now addresses the evolution and diversification of SOA, unifying security, management, and DevOps across SOA, APIs, microservices, and more.
Mar. 31, 2015 08:30 AM EDT Reads: 2,101
Wearable technology was dominant at this year’s International Consumer Electronics Show (CES) , and MWC was no exception to this trend. New versions of favorites, such as the Samsung Gear (three new products were released: the Gear 2, the Gear 2 Neo and the Gear Fit), shared the limelight with new wearables like Pebble Time Steel (the new premium version of the company’s previously released smartwatch) and the LG Watch Urbane. The most dramatic difference at MWC was an emphasis on presenting wearables as fashion accessories and moving away from the original clunky technology associated with t...
Mar. 31, 2015 03:00 AM EDT Reads: 1,548
SYS-CON Events announced today that robomq.io will exhibit at SYS-CON's @ThingsExpo, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. robomq.io is an interoperable and composable platform that connects any device to any application. It helps systems integrators and the solution providers build new and innovative products and service for industries requiring monitoring or intelligence from devices and sensors.
Mar. 30, 2015 06:00 PM EDT Reads: 1,569
The list of ‘new paradigm’ technologies that now surrounds us appears to be at an all time high. From cloud computing and Big Data analytics to Bring Your Own Device (BYOD) and the Internet of Things (IoT), today we have to deal with what the industry likes to call ‘paradigm shifts’ at every level of IT. This is disruption; of course, we understand that – change is almost always disruptive.
Mar. 30, 2015 04:00 PM EDT Reads: 1,182
SYS-CON Events announced today that Solgenia will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY, and the 17th International Cloud Expo®, which will take place on November 3–5, 2015, at the Santa Clara Convention Center in Santa Clara, CA. Solgenia is the global market leader in Cloud Collaboration and Cloud Infrastructure software solutions. Designed to “Bridge the Gap” between Personal and Professional Social, Mobile and Cloud user experiences, our solutions help large and medium-sized organizations dr...
Mar. 30, 2015 03:00 PM EDT Reads: 2,965
SYS-CON Events announced today that SafeLogic has been named “Bag Sponsor” of SYS-CON's 16th International Cloud Expo® New York, which will take place June 9-11, 2015, at the Javits Center in New York City, NY. SafeLogic provides security products for applications in mobile and server/appliance environments. SafeLogic’s flagship product CryptoComply is a FIPS 140-2 validated cryptographic engine designed to secure data on servers, workstations, appliances, mobile devices, and in the Cloud.
Mar. 30, 2015 11:00 AM EDT Reads: 1,544
After making a doctor’s appointment via your mobile device, you receive a calendar invite. The day of your appointment, you get a reminder with the doctor’s location and contact information. As you enter the doctor’s exam room, the medical team is equipped with the latest tablet containing your medical history – he or she makes real time updates to your medical file. At the end of your visit, you receive an electronic prescription to your preferred pharmacy and can schedule your next appointment.
Mar. 30, 2015 10:00 AM EDT Reads: 935
GENBAND has announced that SageNet is leveraging the Nuvia platform to deliver Unified Communications as a Service (UCaaS) to its large base of retail and enterprise customers. Nuvia’s cloud-based solution provides SageNet’s customers with a full suite of business communications and collaboration tools. Two large national SageNet retail customers have recently signed up to deploy the Nuvia platform and the company will continue to sell the service to new and existing customers. Nuvia’s capabilities include HD voice, video, multimedia messaging, mobility, conferencing, Web collaboration, deskt...
Mar. 30, 2015 01:00 AM EDT Reads: 1,522
SYS-CON Media announced today that @WebRTCSummit Blog, the largest WebRTC resource in the world, has been launched. @WebRTCSummit Blog offers top articles, news stories, and blog posts from the world's well-known experts and guarantees better exposure for its authors than any other publication. @WebRTCSummit Blog can be bookmarked ▸ Here @WebRTCSummit conference site can be bookmarked ▸ Here
Mar. 29, 2015 10:00 PM EDT Reads: 1,863
SYS-CON Events announced today that Cisco, the worldwide leader in IT that transforms how people connect, communicate and collaborate, has been named “Gold Sponsor” of SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Cisco makes amazing things happen by connecting the unconnected. Cisco has shaped the future of the Internet by becoming the worldwide leader in transforming how people connect, communicate and collaborate. Cisco and our partners are building the platform for the Internet of Everything by connecting the...
Mar. 29, 2015 07:00 PM EDT Reads: 5,281
Temasys has announced senior management additions to its team. Joining are David Holloway as Vice President of Commercial and Nadine Yap as Vice President of Product. Over the past 12 months Temasys has doubled in size as it adds new customers and expands the development of its Skylink platform. Skylink leads the charge to move WebRTC, traditionally seen as a desktop, browser based technology, to become a ubiquitous web communications technology on web and mobile, as well as Internet of Things compatible devices.
Mar. 29, 2015 06:00 PM EDT Reads: 1,886
Docker is an excellent platform for organizations interested in running microservices. It offers portability and consistency between development and production environments, quick provisioning times, and a simple way to isolate services. In his session at DevOps Summit at 16th Cloud Expo, Shannon Williams, co-founder of Rancher Labs, will walk through these and other benefits of using Docker to run microservices, and provide an overview of RancherOS, a minimalist distribution of Linux designed expressly to run Docker. He will also discuss Rancher, an orchestration and service discovery platf...
Mar. 29, 2015 04:15 PM EDT Reads: 2,469
SYS-CON Events announced today that Vitria Technology, Inc. will exhibit at SYS-CON’s @ThingsExpo, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Vitria will showcase the company’s new IoT Analytics Platform through live demonstrations at booth #330. Vitria’s IoT Analytics Platform, fully integrated and powered by an operational intelligence engine, enables customers to rapidly build and operationalize advanced analytics to deliver timely business outcomes for use cases across the industrial, enterprise, and consumer segments.
Mar. 29, 2015 03:30 PM EDT Reads: 2,229
SYS-CON Events announced today that Liaison Technologies, a leading provider of data management and integration cloud services and solutions, has been named "Silver Sponsor" of SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York, NY. Liaison Technologies is a recognized market leader in providing cloud-enabled data integration and data management solutions to break down complex information barriers, enabling enterprises to make smarter decisions, faster.
Mar. 29, 2015 03:00 PM EDT Reads: 3,512