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  • Developing a Support Plan for Cloud Applications

    - by BuckWoody
    Last week I blogged about developing a High-Availability plan. The specifics of a given plan aren't as simple as "Step 1, then Step 2" because in a hybrid environment (which most of us have) the situation changes the requirements. There are those that look for simple "template" solutions, but unless you settle on a single vendor and a single way of doing things, that's not really viable. The same holds true for support. As I've mentioned before, I'm not fond of the term "cloud", and would rather use the tem "Distributed Computing". That being said, more people understand the former, so I'll just use that for now. What I mean by Distributed Computing is leveraging another system or setup to perform all or some of a computing function. If this definition holds true, then you're essentially creating a partnership with a vendor to run some of your IT - whether that be IaaS, PaaS or SaaS, or more often, a mix. In your on-premises systems, you're the first and sometimes only line of support. That changes when you bring in a Cloud vendor. For Windows Azure, we have plans for support that you can pay for if you like. http://www.windowsazure.com/en-us/support/plans/ You're not off the hook entirely, however. You still need to create a plan to support your users in their applications, especially for the parts you control. The last thing they want to hear is "That's vendor X's problem - you'll have to call them." I find that this is often the last thing the architects think about in a solution. It's fine to put off the support question prior to deployment, but I would hold off on calling it "production" until you have that plan in place. There are lots of examples, like this one: http://www.va-interactive.com/inbusiness/editorial/sales/ibt/customer.html some of which are technology-specific. Once again, this is an "it depends" kind of approach. While it would be nice if there was just something in a box we could buy, it just doesn't work that way in a hybrid system. You have to know your options and apply them appropriately.

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  • Developing a Support Plan for Cloud Applications

    - by BuckWoody
    Last week I blogged about developing a High-Availability plan. The specifics of a given plan aren't as simple as "Step 1, then Step 2" because in a hybrid environment (which most of us have) the situation changes the requirements. There are those that look for simple "template" solutions, but unless you settle on a single vendor and a single way of doing things, that's not really viable. The same holds true for support. As I've mentioned before, I'm not fond of the term "cloud", and would rather use the tem "Distributed Computing". That being said, more people understand the former, so I'll just use that for now. What I mean by Distributed Computing is leveraging another system or setup to perform all or some of a computing function. If this definition holds true, then you're essentially creating a partnership with a vendor to run some of your IT - whether that be IaaS, PaaS or SaaS, or more often, a mix. In your on-premises systems, you're the first and sometimes only line of support. That changes when you bring in a Cloud vendor. For Windows Azure, we have plans for support that you can pay for if you like. http://www.windowsazure.com/en-us/support/plans/ You're not off the hook entirely, however. You still need to create a plan to support your users in their applications, especially for the parts you control. The last thing they want to hear is "That's vendor X's problem - you'll have to call them." I find that this is often the last thing the architects think about in a solution. It's fine to put off the support question prior to deployment, but I would hold off on calling it "production" until you have that plan in place. There are lots of examples, like this one: http://www.va-interactive.com/inbusiness/editorial/sales/ibt/customer.html some of which are technology-specific. Once again, this is an "it depends" kind of approach. While it would be nice if there was just something in a box we could buy, it just doesn't work that way in a hybrid system. You have to know your options and apply them appropriately.

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  • Chapter 5: From 2005 to 2010: Business Logic and Data

    After reading this chapter, you will be able to Use the Entity Framework (EF) to build a data access layer using an existing database or with the Model-First approach .Generate entity types from the Entity Data Model (EDM) Designer using the ADO.NET Entity Framework POCO templates. Get data from Web services Learn about data caching using the Microsoft Windows Server AppFabric (formerly known by the codename “Velocity”)

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  • Automatically minify and combine JavaScript and CSS files in any web site

    This article describes a complete package that speeds up loading of JavaScript, CSS, and images in an ASP.NET web site. It accomplishes this by minifying JavaScript and CSS files on the fly (and caching the minified content), combining JavaScript and CSS files, making it easy to load files from cookieless domains, and much more. This article has full step by step installation instructions for both IIS 7 and IIS 6 (each version requires different additions to web.config). It will also detail how to use all the features, complete with short examples.

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  • Apps Script Office Hours - October 25, 2012

    Apps Script Office Hours - October 25, 2012 - Arun announces an election sample app - soon! Look for the blog post on googleappsdeveloper.blogspot.com - LAX hackathon googleappsdeveloper.blogspot.com - Bill (Google Hangout) asks about ScriptDb. Ikai makes a long analogy about libraries and datastores and offers possible explanations for why certain issues occur, as well as some of the difficulties in working with distributed datastores. From: GoogleDevelopers Views: 48 6 ratings Time: 29:34 More in Science & Technology

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  • JSR Updates

    - by heathervc
    JSR 349, Bean Validation 1.1, has published a Public Review. The review closes on 12 November. JSR 331, Constraint Programming API, has published a Maintenance Release. JSR 335, Lambda Expressions for the Java Programming Language, has moved to JCP 2.8!  Check out their java.net project. JSR 107, JCACHE - Java Temporary Caching API, has posted their Early Draft Release.  The review closes on 22 November.

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  • Does OO, TDD, and Refactoring to Smaller Functions affect Speed of Code?

    - by Dennis
    In Computer Science field, I have noticed a notable shift in thinking when it comes to programming. The advice as it stands now is write smaller, more testable code refactor existing code into smaller and smaller chunks of code until most of your methods/functions are just a few lines long write functions that only do one thing (which makes them smaller again) This is a change compared to the "old" or "bad" code practices where you have methods spanning 2500 lines, and big classes doing everything. My question is this: when it call comes down to machine code, to 1s and 0s, to assembly instructions, should I be at all concerned that my class-separated code with variety of small-to-tiny functions generates too much extra overhead? While I am not exactly familiar with how OO code and function calls are handled in ASM in the end, I do have some idea. I assume that each extra function call, object call, or include call (in some languages), generate an extra set of instructions, thereby increasing code's volume and adding various overhead, without adding actual "useful" code. I also imagine that good optimizations can be done to ASM before it is actually ran on the hardware, but that optimization can only do so much too. Hence, my question -- how much overhead (in space and speed) does well-separated code (split up across hundreds of files, classes, and methods) actually introduce compared to having "one big method that contains everything", due to this overhead? UPDATE for clarity: I am assuming that adding more and more functions and more and more objects and classes in a code will result in more and more parameter passing between smaller code pieces. It was said somewhere (quote TBD) that up to 70% of all code is made up of ASM's MOV instruction - loading CPU registers with proper variables, not the actual computation being done. In my case, you load up CPU's time with PUSH/POP instructions to provide linkage and parameter passing between various pieces of code. The smaller you make your pieces of code, the more overhead "linkage" is required. I am concerned that this linkage adds to software bloat and slow-down and I am wondering if I should be concerned about this, and how much, if any at all, because current and future generations of programmers who are building software for the next century, will have to live with and consume software built using these practices. UPDATE: Multiple files I am writing new code now that is slowly replacing old code. In particular I've noted that one of the old classes was a ~3000 line file (as mentioned earlier). Now it is becoming a set of 15-20 files located across various directories, including test files and not including PHP framework I am using to bind some things together. More files are coming as well. When it comes to disk I/O, loading multiple files is slower than loading one large file. Of course not all files are loaded, they are loaded as needed, and disk caching and memory caching options exist, and yet still I believe that loading multiple files takes more processing than loading a single file into memory. I am adding that to my concern.

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  • Are there any good Java/JVM libraries for my Expression Tree architecture?

    - by Snuggy
    My team and I are developing an enterprise-level application and I have devised an architecture for it that's best described as an "Expression Tree". The basic idea is that the leaf nodes of the tree are very simple expressions (perhaps simple values or strings). Nodes closer to the trunk will get more and more complex, taking the simpler nodes as their inputs and returning more complex results for their parents. Looking at it the other way, the application performs some task, and for this it creates a root expression. The root expression divides its input into smaller units and creates child expressions, which when evaluated it can use to build it's own result. The subdividing process continues until the simplest leaf nodes. There are two very important aspects of this architecture: It must be possible to manipulate nodes of the tree after it is built. The nodes may be given new input values to work with and any change in result for that node needs to be propagated back up the tree to the root node. The application must make best use of available processors and ultimately be scalable to other computers in a grid or in the cloud. Nodes in the tree will often be updating concurrently and notifying other interested nodes in the tree when they get a new value. Unfortunately, I'm not at liberty to discuss my actual application, but to aid understanding a little bit, you might imagine a kind of spreadsheet application being implemented with a similar architecture, where changes to cells in the table are propagated all over the place to other cells that need the result. The spreadsheet could get so massive that applying multi-core multi-computer distributed system to solve it would be of benefit. I've got my prototype "Expression Engine" working nicely on a single multi-core PC but I've started to run into a few concurrency issues (as expected because I haven't been taking too much care so far) so it's now time to start thinking about migrating the Engine to a more robust library, and that leads to a number of related questions: Is there any precedent for my "Expression Tree" architecture that I could research? What programming concepts should I consider. I realise this approach has many similarities to a functional programming style, and I'm already aware of the concepts of using futures and actors. Are there any others? Are there any languages or libraries that I should study? This question is inspired by my accidental discovery of Scala and the Akka library (which has good support for Actors, Futures, Distributed workloads etc.) and I'm wondering if there is anything else I should be looking at as well?

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  • SSDs at PASS 2012

    - by jchang
    There were 7 companies exhibiting SSD products as PASS this year, and one with a product to support SSD storage. This is not counting Dell, EMC and HP who have SSD products, but were at PASS for other reasons. This shows that many have aspirations with the hope that market leadership is not yet firmly set. The products fall into the following: PCI-E SSDs (Fusion-io, LSI, Virident) SSD SAN (Violin, TMS, Whiptail) SSD caching (LSI, GridIron) I am inclined to be of the opinion that SSD market is not...(read more)

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  • What's special in July 26th and why is it used in examples for Expires header so often?

    - by zerkms
    I've noticed that July 26th (my birthday) is used really often in various examples related to preventing http caching using Expires header, like: http://stackoverflow.com/questions/12398714/cache-issue-with-private-networking-stream http://stackoverflow.com/questions/2833305/how-to-expire-page-in-php-when-user-logout http://expressionengine.com/archived_forums/viewthread/81945/ What's special in that date? PS: couldn't add conspiracy tag to the tags because of lack of rep points

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  • git commit –m “CodePlex now supports Git!”

    Finally, yes, CodePlex now supports Git! Git has been one of the top rated requests from the CodePlex community for some time: Admittedly, when we launched CodePlex, we never expected that at some point we would be running a source control system originally invented by Linus Torvalds to use for the Linux kernel. Though I would also say, nobody would have thought the open source ecosystem would be as important to Microsoft as it has become now. Giving CodePlex users what they ask for and supporting their open source efforts has always been important to us, and we have a long list of improvements planned, so stay tuned as we have more up our sleeves! Why Git? So why Git? CodePlex already has Mercurial for distributed version control and TFS (which also supports subversion clients) for centralized version control. The short answer is that the CodePlex community voted, loud and clear, that Git support was critical. Additionally, we just like it, we use Git on our team every day and making the DVCS workflows more available to the CodePlex community is just the right thing to do. Forks and Pull Requests One of the capabilities that distributed version control systems, such as Mercurial and Git, enable is the Fork and Pull Request workflow.  Just like with Mercurial, projects configured to use Git enable Forking the source and submitting contributions back via Pull Requests. The Fork/Pull Request workflow is a key accelerator to many open source projects and you will see improvements in our support coming later this year. More Choice With the addition of Git, now CodePlex has three options when it comes to Open Source project hosting. Projects can now select between TFS, Mercurial, and Git. Each developer has their own preferences, and for some, centralized version control makes more sense to them. For others, DVCS is the only way to go. We’re equally committed to supporting both these technologies for our users. You can get started today by creating a new project or contribute to an existing project by creating a fork. For help on getting started with Git on CodePlex, see our help documentation here. If you would like to switch your project to use Git, please contact us at CodePlex Support with your project information, and we will be happy to help you out. We're Listening CodePlex is your community, and we want to deliver the experiences you need to have a successful open source project. We want your ideas and feedback to make CodePlex a great development community.  The issue tracker on CodePlex is publicly available. Add suggestions or vote up existing suggestions. And you can always find us on Twitter, I’m @mgroves84; follow us to keep up to date with our latest releases: @codeplex

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  • Welcome Xsigo Partners

    - by Cinzia Mascanzoni
    Oracle recently achieved LEC for Xsigo Systems, Inc. and the migration of legacy partners is underway. Welcome Kits were distributed to partners providing details on how to join Oracle PartnerNetwork and next steps to jump start their business with Oracle. To find out more about the transition of Xsigo Partners, view the recently updated FAQ here.

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  • Free APress e-book on GIT!

    - by TATWORTH
    Originally posted on: http://geekswithblogs.net/TATWORTH/archive/2013/07/24/free-apress-e-book-on-git.aspxA free e-book in PDF, mobi and ePub formats is available at http://git-scm.com/book"Programmers or project leaders will learn to use Git, the version control system developed by Linus Torvalds for Linux kernel development. You'll discover the world of distributed version control and learn how to build a Git development workflow, with expert guidance from Scott Chacon."

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  • FileCache for ASP.NET

     FileCache provides fast, file-based caching of any serializable object for both ASP.NET and non-web .NET applications. Article with complete free downloadable source code....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • ?????QCon Tokyo 2010 ??????????!

    - by rika.tokumichi
    ??????OTN????????? 2010?4?19??20??????????·??????????QCon Tokyo 2010?????????? ??????????????????????????????????????????! ??????????????????????????????????^^ ???????????! >QCon Tokyo 2010 ????? ?????????? ????????????????? -------------------------------------------- ???:?? ?? (???? ????) ?????????????? - ????????CoE - ?????????? BI/SOA????????????? ???:?? ?? (???? ?????) ?????????? - ????????? - ??????????? -------------------------------------------- ??????????????????????????????????QCon Tokyo 2010?????????? QCon????????????????????????????InfoQ???????????????????????????????????????·?????????? ????????????4???????????????????????????????·?????????? InfoQ????????????????????????????????????????????????? ?1??? ??????????????Twitter????Nick Kallen??????????? ??????Data Architecture at Twitter Scale?? ?????????????????????????????????????????????????????????????????120????????????????????????????????????????? ??????????????????????????????????????????????????????????????????Twitter????????????????????????????????????????????????? ?????????????????????????????????????????????????????????????????????????????? ????????Oracle Coherence????????????Patrick Peralta??? ?Connected Clouds: A Platform for Globally Distributed Service? ??????????????? Coherence????????KVS??????????????????????????????????????Oracle Coherence?????????????????????????????????? ??????????????????????????????????????????Coherence?Push Replication Pattern?????????????????????????????????????????????????????????????????????????????????????????? ??????????????????????????? ?????????????????????????????????? ?????? ??????????????????????????2???3??????????? ???????????????????????????????! ??????????????????????????????? ?2??? 2??????????????Facebook?Marc Kwiatkowski?????????? ??????Scaling Memcache at Facebook?? 4??????????Facebook???????memcache??????????????????????????????????????? ?????????memchace????????????????????????????????memcache???????????????????????????????????????????????????????????????????????????? ????????????? Java7???????????????????????????????????? Ruby??????????????????????????????Ruby????????? ??????????????????????????? ???????????????! --------------------------------------- ?????????????????????????!! ???????????! ???????2?????????? ??????????????????????????? >QCon Tokyo 2010 ????? ?????????&??????? ?????????????Patrick Peralta?????????? >?????Connected Clouds: A Platform for Globally Distributed Service?(??) by Patrick Peralta ?Oracle Coherence????? ???? ?????? ???????????? Oracle Coherence?????(??????????) OTN????????????????????????????? ??????????????????? >???????????????????1(?????? ???) >???????????????????2(???????) ???????????????????????????????????????????????????!

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  • curl http_code of 000

    - by Mikkel Paulson
    I have a shell script that I use to monitor loading times and response codes on my live server cluster. It runs a total of 250 iterations every 5 minutes, distributed across 10 servers and 6 sites. It uses curl with the -w flag to return pertinent information which is then parsed by my shell script: curl -svw 'monitor_load_times %{time_total} %{http_code}' -b 'server=$server' -m 15 -o /dev/null $url 2>&1 This information is then parsed by a graphing script that can display a number of different responses. However, curl will occasionally return a response code of "000". When this happens, it seems to happen multiple times at once despite being distributed over many iterations: What I'm trying to work out is if this is a client-side issue that's skewing my results or if it's actually indicative of a server-side problem affecting my entire cluster. Does 000 mean that the connection was dropped? Database entries corresponding to curl iterations with that response code return "0.000" for the time_total value. All of the search results I've found for curl returning a code of 000 are related to HTTPS being unsupported, but all of my test URLs are HTTP. (The spike in 500 errors is a completely unrelated issue that affected my servers last night.)

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  • Large virtual memory size of ElasticSearch JVM

    - by wfaulk
    I am running a JVM to support ElasticSearch. I am still working on sizing and tuning, so I left the JVM's max heap size at ElasticSearch's default of 1GB. After putting data in the database, I find that the JVM's process is showing 50GB in SIZE in top output. It appears that this is actually causing performance problems on the system; other processes are having trouble allocating memory. In asking the ElasticSearch community, they suggested that it's "just" filesystem caching. In my experience, filesystem caching doesn't show up as memory used by a particular process. Of course, they may have been talking about something other than the OS's filesystem cache, maybe something that the JVM or ElasticSearch itself is doing on top of the OS. But they also said that it would be released if needed, and that didn't seem to be happening. So can anyone help me figure out how to tune the JVM, or maybe ElasticSearch itself, to not use so much RAM. System is Solaris 10 x86 with 72GB RAM. JVM is "Java(TM) SE Runtime Environment (build 1.7.0_45-b18)".

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  • Prestashop is not saving Memcached settings

    - by ianenri
    I have a issue with the admin site of prestashop. I'm trying to activate the caching system but it doesn't save the setting. When I add a server (I'm using an Amazon ElasticCache server) saves it, but when I select the enable option and click Save, it redirects me to "Back Office Preferences Performance" but with a blank page and the admin tabs visible. I go back to those settings again and i see that the caching option is disabled. Also, there is a warning: "To use Memcached, you must install the Memcache PECL extension on your server. http://www.php.net/manual/en/memcache.installation.php" , even if i already installed memcached via yum. I tried also, by modifying the settings.inc.php file editing define('_PS_CACHE_ENABLED_', '0'); to: define('_PS_CACHE_ENABLED_', '1'); But i get 500 Internal Server Error in every page, so i prefer to leave it as before. Any ideas? I'm using PrestaShop 1.4.6.2 with Nginx 1.0.11 and PHP-FPM 5.3.8 in a CentOS 5.7 system.

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  • Expected IOPS for log writing on PS6000X SAN?

    - by dssz
    Customer is experiencing poor Sybase ASE 15 performance on a PS6000X SAN with 16 X 450GB 10K in RAID-50. The server is a Dell R710 running 2003 server R2 64bit in ESX 4.0.0,256968 I've used sqlio to benchmark the sequential write performance of 4KB blocks on the drive. sqlio -kW -t1 -s600 -dE -o1 -fsequential -b4 -BH -LS sqliotestfile.dat Result is 1900 IOPS. However, when Sybase is running a sustained workload of small inserts SAN HQ shows a consistent 590 IOPS (and 100% 4K write activity). It also shows that the write latency increases to 1.2ms from <1ms. Monitoring and tests in Sybase demonstrate the performance problem is IO related and in particular there is a lot of wait time writing to the log. The SAN indicates that write caching is enabled. What IOPS should the SAN be capable of for 4k sequential write activity? Also, with write caching enabled, shouldn't the controller be batching up the 4K writes into something more efficient? Also, any tips on Sybase on ESX would be appreciated.

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  • GlusterFS on VMWare ESXi 5

    - by Dharmavir
    I want to build network file system on top of my VMWare ESXi based virtual nodes which are running Ubuntu 12.04 LTS. I am evalaluating options and found that GlusterFS (http://www.gluster.org/) can turn out to be a good choice. Purpose: I have about 2 dozen VM nodes with different configurations, on 2 physical nodes which has following configuration: 16 core Intel Xeon 1 TB 48 GB RAM Now as I said earlier each Physical server has about 1TB hdd and I can increase if I want additional so for now I have 2TB disk space available, these space is distributed in VM nodes I have created on which about 2 dozen VM nodes live. Now some of them being application server and mgmt server, they have plenty of free disk space which I want to utilize for some heavy storage which I can not design if I do that individually on single VM node. This way if my storage is distributed between dozens of VM nodes and about 2 or more physical nodes I have some sort of backup as well. I do not mind if data gets stored redundently but per my knowledge it might hapeen that individual VM nodes will not be able to store all of the data because complete data size for example if we take 100GB will exceed VM disk size of 70GB and then VM will also have system and program files on it. I need some suggestion that will GlusterFS be the solution for which I am looking forward to or I should go with something like hadoop? I am not too sure. But yes, I would like to utilize my free space on each VM node and while doing that if I get store data redundently I am okay because it will give me data security.

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  • Request bursting from web application Load Tests

    - by MaseBase
    I'm migrating our web and database hosting to a new environment on all new machines. I've recently performed a Load Test using WAPT to generate load from multiple distributed clients. The server has plenty of room to handle the traffic load, but I'm seeing an odd pattern of incoming traffic during the load tests. Here is the gist of our setup: Firewall server running MS Forefront TMG 2010 on Win 2k8 server Request routing done by IIS Application Request Routing on firewall machine Web server is a Hyper-V VM on the Database server (which is the host OS) These machines are hefty with dual-CPU's with six cores (12 total procs) Web server running IIS 7.5 Web applications built in ASP.NET 2.0, with 1 ISAPI filter (Url Rewrite) in front What I'm seeing during the load tests is that the requests all come through in bursts. Even though I have 7 different distributed clients sending traffic loads, the requests come through about 300-500 requests at a time. The performance monitor shows nearly all of the counters moving through this pattern, where a burst of requests comes in the req/sec jumps to 70, the queued requests jumps to 500, the current requests jumps up, the CPU jumps up, everything. Then once it's handled that group of requests, it has a lull for nearly 10 seconds where nearly nothing is happening. 0-5 req/sec, 0 queued requests, minimal CPU usage. Then after 10 seconds of inactivity, another burst comes through, spiking all of the counters once again. What I can't figure out is why the requests are coming through in bursts when I know that the load being generated is not sent that way, especially considering the various load-generating clients sending traffic all in different intervals with random think time's between each request. Is there something in the layers between Hyper-V or perhaps in the hardware which might cause this coalesce of requests together? Here is what i'm looking at, the highlighted metric is Requests/sec, but the others critical counter go with it: Requests Queued (which I'd obviously like to keep as close to 0 as possible). Any ideas on this?

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  • Webserver optimization

    - by f-aminov
    Hi guys! I have a website hosted on a VPS (512Mb - minimum guranteed memory, 510Mhz proccessor, Debian 5.0 Lenny, Apache 2.2.9 with nginx 0.7.65 as a frontend to serve static content, MySQL 5.1.44, PHP 5.3.2 with APC caching). I'm a web developer, so I'm not very good at optimizing servers, but I've managed to install and setup all those neccessary components (LAMP, nginx, etc.). After that I decided to stress test my website (which uses Drupal 6.16 with caching and all possible optimization enabled) using a utility called "Webserver Stress Tool 7". And it seems to me that the results aren't any good - here is a graph (sorry, as a new user I'm not allowed to post images) As you can see the response time depending on amount of simultaneous users increases very quickly. With 10 simultaneous users the time is about 1000ms, with 100 simultaneous users it's about 15000ms (15s!). The question is do you think this is normal behavior for such a server or something is wrong with the settings and optimization? If you think something is wrong what particulary could be wrong? Any other suggestion how to speed this a little bit up?

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