|By Thomas Krafft||
|December 4, 2012 07:45 AM EST||
Wikibon produced an interesting material (looks like paid by Aerospike, NoSQL database recently emerged by resurrecting failed CitrusLeaf and acquihiring AlchemyDB, which product, of course, was recommended in the end) that compares NoSQL databases based on storing data in flash-based SSD vs. storing data in DRAM.
There are number of factual problems with that paper and I want to point them out.
Note that Wikibon doesn’t mention GridGain in this study (we are not a NoSQL datastore per-se after all) so I don’t have any bone in this game other than annoyance with biased and factually incorrect writing.
“Minimal” Performance Advantage of DRAM vs SSD
The paper starts with a simple statement “The minimal performance disadvantage of flash, relative to main memory…”. Minimal? I’ve seen number of studies where performance difference between SSDs and DRAM range form 100 to 10,000 times. For example, this University of California, Berkeley study claims that SSD bring almost no advantage to the Facebook Hadoop cluster and DRAM pre-caching is the way forward.
Let me provide even shorter explanation. Assuming we are dealing with Java – SSD devices are visible to Java application as typical block devices, and therefore accessed as such. It means that a typical object read from such device involves the same steps as reading this object from a file: hardware I/O subsystem, OS I/O subsystem, OS buffering, Java I/O subsystem & buffering, Java deserialization and induced GC. And… if you read the same object from DRAM – it involves few bytecode instructions – and that’s it.
Native C/C++ apps (like MongoDB) can take a slightly quicker route with memory mapped files (or various other IPC methods) – but the performance increase will not be significant (for obvious reason of needing to read/swap the entire pages vs. single object access pattern in DRAM).
Yet another recent technical explanation of the disadvantages of SSD storage can be found here (talking about Oracle’s “in-memory” strategy).
MongoDB, Cassandra, CouchDB DRAM-based?
Amid all the confusion on this topic it’s no wonder the author got it wrong. Neither MongoDB, Cassandra or CouchDB are in-memory systems. They are disk-based systems with support for memory caching. There’s nothing wrong with that and nothing new – every database developed in the last 25 years naturally provides in-memory caching to augment it’s main disk storage.
The fundamental difference here is that in-memory data systems like GridGain, SAP HAHA, GigaSpaces, GemFire, SqlFire, MemSQL, VoltDB, etc. use DRAM (memory) as the main storage medium and use disk for optional durability and overflow. This focus on RAM-based storage allows to completely re-optimized all main algorithms used in these systems.
For example, ACID implementation in GridGain that provides support for full-featured distributed ACID transactions beats every NoSQL database (EC-based) out there in read and even write performance: there are no single key limitations, no consistency trade offs to make, no application-side MVCC, no user-based conflict resolutions or other crutches – it just works the same way as it works in Oracle or DB2 – but faster.
2TB Cluster for $1.2M :)
If there was on piece in the original paper that was completely made up to fit the predefined narrative it was a price comparison. If the author thinks that 2TB RAM cluster costs $1.2M today – I have not one but two Golden Gate bridges to sell just for him…
Let’s see. A typical Dell/HP/IBM/Cisco blade with 256GB of DRAM will cost below $20K if you just buy on the list prices (Cisco seems to offer the best prices starting at around $15K for 256GB blades). That brings the total cost of 2TB cluster well below $200K (with all network and power equipment included and 100s TBs of disk storage).
Is this more expensive that SSD only cluster? Yes, by 2.5-3x times more expensive. But you are getting dramatic performance increase with the right software that more than justifies that price increase.
2-3x times price difference is nonetheless important and it provides our customers a very clear choice. If price is an issue and high performance is not – there are disk-based systems of wide varieties. If high performance and sub-second response on processing TBs of data is required – the hardware will be proportionally more expensive.
However, with 1GB of DRAM costing less than 1 USD and DRAM prices dropping 30% every 18 months – the era of disks (flash or spinning) is clearly coming to its logical end. It’s normal… it’s a progress and we all need to learn how to adapt.
Has anyone seen tape drives lately?
Technology vendors and analysts are eager to paint a rosy picture of how wonderful IoT is and why your deployment will be great with the use of their products and services. While it is easy to showcase successful IoT solutions, identifying IoT systems that missed the mark or failed can often provide more in the way of key lessons learned. In his session at @ThingsExpo, Peter Vanderminden, Principal Industry Analyst for IoT & Digital Supply Chain to Flatiron Strategies, will focus on how IoT depl...
Jan. 18, 2017 02:30 AM EST Reads: 1,805
Data is an unusual currency; it is not restricted by the same transactional limitations as money or people. In fact, the more that you leverage your data across multiple business use cases, the more valuable it becomes to the organization. And the same can be said about the organization’s analytics. In his session at 19th Cloud Expo, Bill Schmarzo, CTO for the Big Data Practice at Dell EMC, introduced a methodology for capturing, enriching and sharing data (and analytics) across the organization...
Jan. 18, 2017 02:15 AM EST Reads: 3,201
With all the incredible momentum behind the Internet of Things (IoT) industry, it is easy to forget that not a single CEO wakes up and wonders if “my IoT is broken.” What they wonder is if they are making the right decisions to do all they can to increase revenue, decrease costs, and improve customer experience – effectively the same challenges they have always had in growing their business. The exciting thing about the IoT industry is now these decisions can be better, faster, and smarter. Now ...
Jan. 18, 2017 01:30 AM EST Reads: 4,196
WebRTC is about the data channel as much as about video and audio conferencing. However, basically all commercial WebRTC applications have been built with a focus on audio and video. The handling of “data” has been limited to text chat and file download – all other data sharing seems to end with screensharing. What is holding back a more intensive use of peer-to-peer data? In her session at @ThingsExpo, Dr Silvia Pfeiffer, WebRTC Applications Team Lead at National ICT Australia, looked at differ...
Jan. 18, 2017 01:15 AM EST Reads: 4,867
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...
Jan. 18, 2017 01:00 AM EST Reads: 6,042
"ReadyTalk is an audio and web video conferencing provider. We've really come to embrace WebRTC as the platform for our future of technology," explained Dan Cunningham, CTO of ReadyTalk, in this SYS-CON.tv interview at WebRTC Summit at 19th Cloud Expo, held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA.
Jan. 18, 2017 12:00 AM EST Reads: 2,255
In 2014, Amazon announced a new form of compute called Lambda. We didn't know it at the time, but this represented a fundamental shift in what we expect from cloud computing. Now, all of the major cloud computing vendors want to take part in this disruptive technology. In his session at 20th Cloud Expo, John Jelinek IV, a web developer at Linux Academy, will discuss why major players like AWS, Microsoft Azure, IBM Bluemix, and Google Cloud Platform are all trying to sidestep VMs and containers...
Jan. 17, 2017 11:00 PM EST Reads: 572
IoT is at the core or many Digital Transformation initiatives with the goal of re-inventing a company's business model. We all agree that collecting relevant IoT data will result in massive amounts of data needing to be stored. However, with the rapid development of IoT devices and ongoing business model transformation, we are not able to predict the volume and growth of IoT data. And with the lack of IoT history, traditional methods of IT and infrastructure planning based on the past do not app...
Jan. 17, 2017 10:30 PM EST Reads: 724
The many IoT deployments around the world are busy integrating smart devices and sensors into their enterprise IT infrastructures. Yet all of this technology – and there are an amazing number of choices – is of no use without the software to gather, communicate, and analyze the new data flows. Without software, there is no IT. In this power panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, Dave McCarthy, Director of Products at Bsquare Corporation; Alan Williamson, Principal ...
Jan. 17, 2017 10:30 PM EST Reads: 2,365
WebRTC has had a real tough three or four years, and so have those working with it. Only a few short years ago, the development world were excited about WebRTC and proclaiming how awesome it was. You might have played with the technology a couple of years ago, only to find the extra infrastructure requirements were painful to implement and poorly documented. This probably left a bitter taste in your mouth, especially when things went wrong.
Jan. 17, 2017 09:15 PM EST Reads: 7,557
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
Jan. 17, 2017 08:00 PM EST Reads: 11,639
A critical component of any IoT project is what to do with all the data being generated. This data needs to be captured, processed, structured, and stored in a way to facilitate different kinds of queries. Traditional data warehouse and analytical systems are mature technologies that can be used to handle certain kinds of queries, but they are not always well suited to many problems, particularly when there is a need for real-time insights.
Jan. 17, 2017 06:45 PM EST Reads: 6,222
Providing secure, mobile access to sensitive data sets is a critical element in realizing the full potential of cloud computing. However, large data caches remain inaccessible to edge devices for reasons of security, size, format or limited viewing capabilities. Medical imaging, computer aided design and seismic interpretation are just a few examples of industries facing this challenge. Rather than fighting for incremental gains by pulling these datasets to edge devices, we need to embrace the i...
Jan. 17, 2017 05:15 PM EST Reads: 3,569
Web Real-Time Communication APIs have quickly revolutionized what browsers are capable of. In addition to video and audio streams, we can now bi-directionally send arbitrary data over WebRTC's PeerConnection Data Channels. With the advent of Progressive Web Apps and new hardware APIs such as WebBluetooh and WebUSB, we can finally enable users to stitch together the Internet of Things directly from their browsers while communicating privately and securely in a decentralized way.
Jan. 17, 2017 04:45 PM EST Reads: 3,055
Fifty billion connected devices and still no winning protocols standards. HTTP, WebSockets, MQTT, and CoAP seem to be leading in the IoT protocol race at the moment but many more protocols are getting introduced on a regular basis. Each protocol has its pros and cons depending on the nature of the communications. Does there really need to be only one protocol to rule them all? Of course not. In his session at @ThingsExpo, Chris Matthieu, co-founder and CTO of Octoblu, walked through how Octob...
Jan. 17, 2017 04:30 PM EST Reads: 2,907
The Internet of Things can drive efficiency for airlines and airports. In their session at @ThingsExpo, Shyam Varan Nath, Principal Architect with GE, and Sudip Majumder, senior director of development at Oracle, discussed the technical details of the connected airline baggage and related social media solutions. These IoT applications will enhance travelers' journey experience and drive efficiency for the airlines and the airports.
Jan. 17, 2017 04:15 PM EST Reads: 1,983
SYS-CON Events announced today that Catchpoint, a leading digital experience intelligence company, has been named “Silver Sponsor” of SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Catchpoint Systems is a leading Digital Performance Analytics company that provides unparalleled insight into your customer-critical services to help you consistently deliver an amazing customer experience. Designed for digital business, C...
Jan. 17, 2017 02:30 PM EST Reads: 1,744
With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend @ThingsExpo 2016 in New York. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be! Internet of @ThingsExpo, taking place June 6-8, 2017, at the Javits Center in New York City, New York, is co-located with 20th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry p...
Jan. 17, 2017 02:15 PM EST Reads: 3,643
In his General Session at 17th Cloud Expo, Bruce Swann, Senior Product Marketing Manager for Adobe Campaign, explored the key ingredients of cross-channel marketing in a digital world. Learn how the Adobe Marketing Cloud can help marketers embrace opportunities for personalized, relevant and real-time customer engagement across offline (direct mail, point of sale, call center) and digital (email, website, SMS, mobile apps, social networks, connected objects).
Jan. 17, 2017 02:00 PM EST Reads: 5,381
Things are changing so quickly in IoT that it would take a wizard to predict which ecosystem will gain the most traction. In order for IoT to reach its potential, smart devices must be able to work together. Today, there are a slew of interoperability standards being promoted by big names to make this happen: HomeKit, Brillo and Alljoyn. In his session at @ThingsExpo, Adam Justice, vice president and general manager of Grid Connect, will review what happens when smart devices don’t work togethe...
Jan. 17, 2017 01:45 PM EST Reads: 278