|By Flex News Desk||
|October 22, 2008 03:56 PM EDT||
Open sourcing of the highly compressed communication protocol AMF and server‐side Flex components play an important role in adoption of Flex by the enterprises. Live Cycle Data Services (LCDS) is an excellent solution for building scalable RIA, but it’s not cheap. For those who don’t have a budget for LCDS, Adobe has released BlazeDS, the open source implementation of AMF communication protocol.
BlazeDS was offered as a free version of LCDS Flex remoting that also promised scaled down support of a modest number of concurrent users for data push.
But the enterprise clients wanted the best of both worlds: an inexpensive and scalable solution. The great part about LCDS and BlazeDS is that their code base is extendable and you can try to make the code do new things. The problem is that the base code is targeting only conventional Java Servlet container where BlazeDS is deployed, and performance/scalability of BlazeDS also depends on the number of concurrent connections supported by your server such as Tomcat, JBoss, WebSphere et al.
Farata Systems architects started experiments in this area when the prerelease of Jetty 7 became available. Jetty is a mature open source server that supports Java Servlet 3.0 specification (JSR 315).
BlazeDS runs in a servlet container, which maintains a thread pool. Each thread is given to a client request and is returned back to the reusable pool after the client is served. When the client uses so called long running connection that thread becomes locked by that client as it never finishes the request. So the number of the concurrent subscribers in BlazeDS depends on the number of threads a particular servlet container can hold.
While BlazeDS is preconfigured with just 10 simultaneous connections, it can be increased to several hundreds, and the actual number depends on the server's threading configuration, CPU and the size of its JVM heap memory. This number can also be affected by the number of messages processed by server in the unit of time and size of the messages.
Non-blocking I/O combined with Servlet 3.0 architectureallowsyou to write the code that is not tied to available server threads. The servlet container sends a request for execution and puts it in a suspended mode releasing the thread for other requests. When the result comes back, it resumes the processing of the request efficiently recycling a smaller number of threads. Because of that, the number of streaming connections can be increased to thousands.
The first goal was to create a module for BlazeDS to support the Servlet 3.0 with the messaging based on the AMF streaming. Thus test was set with Jetty - the first servlet container that implements Servlet 3.0 API. In less than six months this specification will be supported by most of the J2EE application servers. Additional endpoints ( components responsible for binding actual application services with servlet container ) were created based on BlazeDS open source implementation.
Tree small changes are required to add nio endpoints to a standard BlazeDS (or LCDS for that matter) application in the standard Jetty installation:
a) Add Farata’s nioblazeds.jar to Jetty’s lib folder
b) Modify the services-config.xml file of BlazeDS to change the standard thread-based end point for AMF streaming with Farata’s NioAmfEndpoint that supports Servlet 3.0 API.
c) Increase the parameter of the Jetty’s number of open file handlers based on the number of concurrent users requests you are planning to process.
The Trader Desktop, a sample application that comes with BlazeDS was successfully deployed under BlazeDS/Jetty and tested without any changes with enhanced endpoints.
The next step was to stress test this application using one of the commercial testing software suites that support AMF protocol. Farata engineers teamed up with Neotys, creator of a robust stress testing product called NeoLoad, that allows to emulate workload of tens of thousands of users hitting a server via both HTTP and AMF protocols.
Now you can watch a short screencast of the test that emulates 5000 users working with the Trader Desktop over the 5 minute period. The test starts with 200 users ramping up at the rate of 500 users per 10 seconds.
In this demo, the server side feed sends the messages about the latest stock prices to the Flex subscribers. After that, you’ll be monitoring this process using ds-console, yet another sample application that comes with
BlazeDS. First, the monitor will show just one client with a small number of messages, and the number of maximum streaming client is set to 65535.
Then you’ll see how easy it is with Neoload to load a large number of the users. The test uses 5 machines to emulate the load. The push count is the number of messages sent by the server. The test runs on a 8-cpu machine. Watch the number of allocated threads and the number of users – the number of threads is several times lower than the number of users at any given time. Please note that even when the number of users grows, the number of threads doesn’t. These processes are not expensive neither from the memory not from the CPU utilization perspective.
In this test the system was purposely restricted by introducing throttling in the Feed.java.
During this 5 minute test the server sent about 2.1 million messages. Since the first three minutes (180 seconds) of the test Neoload was ramping up the number of users until it reached 5000, count this time as a half or 90 seconds. Adding another two minutes brings the adjusted test time to 210 seconds or 10000 messages per second. This means that that each of 5000 users received 2 messages per second, which matches the throttling parameter that was set( in Feed.java we specified 400ms of sleep time between messages broadcast). Based on the server CPU and memory utilization we should have no problem supporting over 12000 users on this configuration as long as bandwidth and external load generators are added.
One of the machines used in this test was an 8-core MacPro for the server and four of the cores were shared with the VM emulating one of the client’s machine. There were also two 3Ghz desktops, one MacBook Pro and one 2Ghz Dell laptop - that’s the one that will work really hard trying to parse 300 messages per second. Actually, NeoLoad goes a little too hard on the client trying to even parse AMF messages on the machine running thousands of simulated clients.
The screencast of the stress test is located at http://myflex.org//demos/JettyBlazeDS/JettyBlazeDSloadTest.html .
Comparing with conventional and other technologies
Farata ran the same test with Apache Tomcat server using traditional thread-based I/O and standard BlazeDS long polling. Tomcat comes preconfigured with 250 threads. After increasing gradually this number, the same test can run for about 800 users, but pretty soon the system becomes unstable running out of threads and giving out of memory errors.
Tomcat also has experimental NIO implementation of servlet container named Comet. Farata has also created an endpoint adapter to utilize this feature of Jetty with BlazeDS. But while holding high promises of more efficient full duplex protocol the current Tomcat Comet implementation had some reliability issues.
The screencast should be treated as feasibility study and technical comment and not the benchmark of any sort as it still has a lot of room for improvement. More tests are required against the final release of Servlet 3 implementation for proper scalability benchmark for different servers/configurations.
Based on these results, you may consider using open source BlazeDS in the most demanding enterprise Flex applications. To be fair, we need to mention that LCDS is more than a data push, but if you are looking for a no-cost extensible solution that works in a standard Web environment with corporate firewalls and require session management, properly tuned BlazeDS becomes a good scalable solution for you next RIA.
|Jedi 03/10/10 08:01:00 AM EST|
I tried this setup. But I am getting this error:
What is causing this?
|Yakov Fain 10/27/08 01:05:21 PM EDT|
At this point these are just experiments that we perform to accommodate the need of some of our clients.
This year we are not planning to open source it, but most likely will do it next year when more J2EE app servers will start implementing Servlets 3.0 spec. As far as I know, Resin will be next.
|[email protected] 10/27/08 07:02:33 AM EDT|
Where can i find nioblazeds.jar? Is it or will it be open source?
|frankyin 10/26/08 09:54:55 PM EDT|
Sounds very interesting.
Apache Hadoop is emerging as a distributed platform for handling large and fast incoming streams of data. Predictive maintenance, supply chain optimization, and Internet-of-Things analysis are examples where Hadoop provides the scalable storage, processing, and analytics platform to gain meaningful insights from granular data that is typically only valuable from a large-scale, aggregate view. One architecture useful for capturing and analyzing streaming data is the Lambda Architecture, represent...
Mar. 25, 2017 08:45 PM EDT Reads: 5,900
My team embarked on building a data lake for our sales and marketing data to better understand customer journeys. This required building a hybrid data pipeline to connect our cloud CRM with the new Hadoop Data Lake. One challenge is that IT was not in a position to provide support until we proved value and marketing did not have the experience, so we embarked on the journey ourselves within the product marketing team for our line of business within Progress. In his session at @BigDataExpo, Sum...
Mar. 25, 2017 08:45 PM EDT Reads: 2,732
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...
Mar. 25, 2017 06:15 PM EDT Reads: 2,548
SYS-CON Events announced today that Ocean9will exhibit at 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. Ocean9 provides cloud services for Backup, Disaster Recovery (DRaaS) and instant Innovation, and redefines enterprise infrastructure with its cloud native subscription offerings for mission critical SAP workloads.
Mar. 25, 2017 05:15 PM EDT Reads: 1,916
In his session at @ThingsExpo, Eric Lachapelle, CEO of the Professional Evaluation and Certification Board (PECB), will provide an overview of various initiatives to certifiy the security of connected devices and future trends in ensuring public trust of IoT. Eric Lachapelle is the Chief Executive Officer of the Professional Evaluation and Certification Board (PECB), an international certification body. His role is to help companies and individuals to achieve professional, accredited and worldw...
Mar. 25, 2017 04:00 PM EDT Reads: 483
SYS-CON Events announced today that Technologic Systems Inc., an embedded systems solutions company, will exhibit at SYS-CON's @ThingsExpo, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Technologic Systems is an embedded systems company with headquarters in Fountain Hills, Arizona. They have been in business for 32 years, helping more than 8,000 OEM customers and building over a hundred COTS products that have never been discontinued. Technologic Systems’ pr...
Mar. 25, 2017 01:45 PM EDT Reads: 3,277
SYS-CON Events announced today that CA Technologies has been named “Platinum 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, and the 21st International Cloud Expo®, which will take place October 31-November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. CA Technologies helps customers succeed in a future where every business – from apparel to energy – is being rewritten by software. From ...
Mar. 25, 2017 01:30 PM EDT Reads: 1,693
The taxi industry never saw Uber coming. Startups are a threat to incumbents like never before, and a major enabler for startups is that they are instantly “cloud ready.” If innovation moves at the pace of IT, then your company is in trouble. Why? Because your data center will not keep up with frenetic pace AWS, Microsoft and Google are rolling out new capabilities In his session at 20th Cloud Expo, Don Browning, VP of Cloud Architecture at Turner, will posit that disruption is inevitable for c...
Mar. 25, 2017 01:15 PM EDT Reads: 2,034
SYS-CON Events announced today that Cloudistics, an on-premises cloud computing company, has been named “Bronze 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. Cloudistics delivers a complete public cloud experience with composable on-premises infrastructures to medium and large enterprises. Its software-defined technology natively converges network, storage, compute, virtualization, and management into a ...
Mar. 25, 2017 12:45 PM EDT Reads: 1,869
Keeping pace with advancements in software delivery processes and tooling is taxing even for the most proficient organizations. Point tools, platforms, open source and the increasing adoption of private and public cloud services requires strong engineering rigor - all in the face of developer demands to use the tools of choice. As Agile has settled in as a mainstream practice, now DevOps has emerged as the next wave to improve software delivery speed and output. To make DevOps work, organization...
Mar. 25, 2017 12:45 PM EDT Reads: 1,669
The explosion of new web/cloud/IoT-based applications and the data they generate are transforming our world right before our eyes. In this rush to adopt these new technologies, organizations are often ignoring fundamental questions concerning who owns the data and failing to ask for permission to conduct invasive surveillance of their customers. Organizations that are not transparent about how their systems gather data telemetry without offering shared data ownership risk product rejection, regu...
Mar. 25, 2017 12:30 PM EDT Reads: 5,054
SYS-CON Events announced today that Loom Systems will exhibit at 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. Founded in 2015, Loom Systems delivers an advanced AI solution to predict and prevent problems in the digital business. Loom stands alone in the industry as an AI analysis platform requiring no prior math knowledge from operators, leveraging the existing staff to succeed in the digital era. With offices in S...
Mar. 25, 2017 12:30 PM EDT Reads: 1,162
SYS-CON Events announced today that Interoute, owner-operator of one of Europe's largest networks and a global cloud services platform, has been named “Bronze Sponsor” of SYS-CON's 20th Cloud Expo, which will take place on June 6-8, 2017 at the Javits Center in New York, New York. Interoute is the owner-operator of one of Europe's largest networks and a global cloud services platform which encompasses 12 data centers, 14 virtual data centers and 31 colocation centers, with connections to 195 add...
Mar. 25, 2017 12:00 PM EDT Reads: 927
SYS-CON Events announced today that SoftLayer, an IBM Company, has been named “Gold Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York, New York. SoftLayer, an IBM Company, provides cloud infrastructure as a service from a growing number of data centers and network points of presence around the world. SoftLayer’s customers range from Web startups to global enterprises.
Mar. 25, 2017 11:15 AM EDT Reads: 1,526
SYS-CON Events announced today that CrowdReviews.com has been named “Media 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. CrowdReviews.com is a transparent online platform for determining which products and services are the best based on the opinion of the crowd. The crowd consists of Internet users that have experienced products and services first-hand and have an interest in letting other potential buyers...
Mar. 25, 2017 11:00 AM EDT Reads: 3,544
SYS-CON Events announced today that T-Mobile will exhibit at 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. As America's Un-carrier, T-Mobile US, Inc., is redefining the way consumers and businesses buy wireless services through leading product and service innovation. The Company's advanced nationwide 4G LTE network delivers outstanding wireless experiences to 67.4 million customers who are unwilling to compromise on ...
Mar. 25, 2017 10:45 AM EDT Reads: 2,082
SYS-CON Events announced today that Infranics will exhibit at 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. Since 2000, Infranics has developed SysMaster Suite, which is required for the stable and efficient management of ICT infrastructure. The ICT management solution developed and provided by Infranics continues to add intelligence to the ICT infrastructure through the IMC (Infra Management Cycle) based on mathemat...
Mar. 25, 2017 10:00 AM EDT Reads: 2,920
SYS-CON Events announced today that SD Times | BZ Media has been named “Media 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. BZ Media LLC is a high-tech media company that produces technical conferences and expositions, and publishes a magazine, newsletters and websites in the software development, SharePoint, mobile development and commercial UAV markets.
Mar. 25, 2017 09:15 AM EDT Reads: 4,225
SYS-CON Events announced today that Telecom Reseller has been named “Media 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. Telecom Reseller reports on Unified Communications, UCaaS, BPaaS for enterprise and SMBs. They report extensively on both customer premises based solutions such as IP-PBX as well as cloud based and hosted platforms.
Mar. 25, 2017 08:30 AM EDT Reads: 2,046
"I think that everyone recognizes that for IoT to really realize its full potential and value that it is about creating ecosystems and marketplaces and that no single vendor is able to support what is required," explained Esmeralda Swartz, VP, Marketing Enterprise and Cloud at Ericsson, in this SYS-CON.tv interview at @ThingsExpo, held June 7-9, 2016, at the Javits Center in New York City, NY.
Mar. 25, 2017 08:00 AM EDT Reads: 4,078