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  • I Need a recommendation for a CMS application with ECommerce

    - by Griff
    Does anyone have any recommendation for an open source solution for a robust CMS application that has a fully featured ECommerce module? I have been looking into Drupal with Ubercart -- but it looks like Ubercart is not fully up to speed with Drupal 7, and the other modules for Ecommerce don't look as robust. The CMS system should support CMIS as both client and server, and be able to run in a cloud computing environment. The system could be written in any standard web programming language, although Java would be my preference. I'm posting this question here because it seems that all CMS systems provide ECommerce as an afterthought, rather than a core feature.

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  • Common practice in handling bounce message

    - by foodil
    At now I mainly create a mail account separately (with different domain name [email protected]) and i add this mail as one return path. So the bounce message will only go to that mailbox and i parse the mail message one by one to check the failure receipent and the error code, then i convert the error code to the actual error message. Finally, the error message and the fail receipent's mail are post to my system and let my system user check the bounce information. Is it a common practice? Since i am worry about the mail other from bounce message have sent to my mail box, that would be a disaster if i parse them without filter them out, but how can i filter out between bounce message and normal mail? Thank you for any kind of help.

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  • Oracle University Nuevos cursos (Week 12)

    - by swalker
    Oracle University ha publicado recientemenete las siguentes formaciones (o versiones) nuevos: Database Oracle Enterprise Manager Cloud Control 12c: Install & Upgrade (2 days) Using Oracle Enterprise Manager Cloud Control 12c Introduction to Big Data (1 day seminar) Introduction to Oracle NoSQL Database (1 day seminar) Oracle Database Administration I: Certification Exam Preparation Seminar (Training On Demand) Development Tools Oracle Database SQL: Certification Exam Preparation Seminar (Training On Demand) MySQL MySQL for Beginners (4 days) Fusion Middleware Oracle Service Bus 11g: System Admin, Design & Integrate Accelerated (5 days) Oracle WebLogic Server 11g: Administration Essentials (Training On Demand) Oracle Solaris Developing and Deploying Applications on Oracle Solaris 11 (3 days) Fusion Applications Fusion Applications: Installation and Administration (4 days) E-Business Suite R12.x Oracle E-Business Suite Essentials for Implementers (Training On Demand) R12.x Implement Oracle Workflow (Training On Demand) R12.x Oracle Applications System Administrator Fundamentals (Training On Demand) PeopleSoft PeopleSoft PeopleTools I Rel 8.50 (Training On Demand) Póngase en contacto con el equipo local de Oracle University para conocer las fechas y otros detalles de los cursos. Manténgase conectado a Oracle University: LinkedIn OracleMix Twitter Facebook Google+

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  • Oracle University Nouveaux cours (Week 12)

    - by swalker
    Parmi les nouveautés d’Oracle Université de ce mois-ci, vous trouverez : Database Oracle Enterprise Manager Cloud Control 12c: Install & Upgrade (2 days) Using Oracle Enterprise Manager Cloud Control 12c Introduction to Big Data (1 day seminar) Introduction to Oracle NoSQL Database (1 day seminar) Oracle Database Administration I: Certification Exam Preparation Seminar (Training On Demand) Development Tools Oracle Database SQL: Certification Exam Preparation Seminar (Training On Demand) MySQL MySQL for Beginners (4 days) Fusion Middleware Oracle Service Bus 11g: System Admin, Design & Integrate Accelerated (5 days) Oracle WebLogic Server 11g: Administration Essentials (Training On Demand) Oracle Solaris Developing and Deploying Applications on Oracle Solaris 11 (3 days) Fusion Applications Fusion Applications: Installation and Administration (4 days) E-Business Suite R12.x Oracle E-Business Suite Essentials for Implementers (Training On Demand) R12.x Implement Oracle Workflow (Training On Demand) R12.x Oracle Applications System Administrator Fundamentals (Training On Demand) PeopleSoft PeopleSoft PeopleTools I Rel 8.50 (Training On Demand) Contacter l’équipe locale d’Oracle University pour toute information et dates de cours. Restez connecté à Oracle University : LinkedIn OracleMix Twitter Facebook Google+

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  • Flowchart for solving programming problems

    - by nurne
    I noticed that every developer implements a somewhat different flowchart for solving programming problems. By flowchart I mean a defined system of techniques that the developer goes through in a certain sequence, trying to solve the problem at hand. Some examples for techniques: Google "how to..." or "... tutorial". Search the java/msdn/apple/etc API doc for the specific class or method. Search in stack overflow the exact problem with some tags like [iphone]/[java] etc. Take a nap and let the subconscious work. Debug. Draw the algorithm or system. Google the logged error message. Ask a colleague or manager. Ask a new question in stack overflow. From your experience, what is the best flowchart for solving a programming problem?

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  • How to do thread management in C++?

    - by Dipan Mehta
    We use pthread for thread management in C based systems. pthread is in general compilable by C++ compiler (like g++). However, what are the better ways of abstractions for threads in C++? Also, for making any system to be working in a multi-threaded system, it is also important to make thread safe. What are the standard libraries that requires alternative (installs) to be thread safe or are they unsafe for multi-threaded environments? Is smart pointers, templates require special measures to make it safe? What are the best practices for the thread managements in C++?

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  • Checking for DBNull

    - by Jim Lahman
    Using a table adapter to a SQL Server database table that returns a NULL record.  We determine the fields are NULL by comparing against System.DBNull Looking the NULL records in SQL Management studio   Using a table adapter to retrieve a record   1: try 2: { 3: this.vTrackingTableAdapter.FillByTrkZone(this.dsL1Write.vTracking, iTrkZone); 4: } 5: catch (Exception ex) 6: { 7: sLogMessage = String 8: .Format("Error getting coil number from tracking table at {0} - {1}", 9: sTrkName, 10: ex.Message); 11: throw new CannotReadTrackingTableException(sLogMessage); 12: }   Looking at the record as it returned from the table adapter:   ItemArrayObject Column [0] ChargeCoilNumber [1] HeadWeldZone [2] TailWeldZone [3] ZoneLen [4] ZoneCoilLen [5] Confirmed [6] Validated [7] EntryWidth [8] EntryThickness   Since each item in the ItemArray is an object, we can test for null   1: if (dsL1Write.vTracking.Rows[0].ItemArray[0] == System.DBNull.Value) 2: { 3: throw new NoCoilAtPORException("NULL coil found at tracking zone " + sTrkName); 4: }   If no records were returned by the table adapter 1: if (dsL1Write.vTracking.Rows.Count == 0) 2: { 3: throw new NoCoilAtPORException("No coils found at tracking zone " + sTrkName); 4: }

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  • Why don't I have the option ''Install Ubuntu alongside with them''

    - by almqgh
    Why dont I have this option? here are my disk sudo fdisk -l Disk /dev/sda: 640.1 GB, 640135028736 bytes 255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x5b53cc54 Device Boot Start End Blocks Id System /dev/sda1 * 2048 409599 203776 7 HPFS/NTFS/exFAT /dev/sda2 409600 1153767021 576678711 7 HPFS/NTFS/exFAT /dev/sda3 1216962560 1250050047 16543744 7 HPFS/NTFS/exFAT /dev/sda4 1250050048 1250261679 105816 c W95 FAT32 (LBA) Disk /dev/sdb: 4005 MB, 4005527552 bytes 32 heads, 63 sectors/track, 3880 cylinders, total 7823296 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x20d8782d Device Boot Start End Blocks Id System /dev/sdb1 * 63 7822079 3911008+ c W95 FAT32 (LBA)

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  • Pppoe wireless connection, Ubuntu 12.4

    - by Barbara
    I recently bought a new computer (Asus 1015 cx) with Ubuntu (12.4) as preinstalled system. My problem is with the internet. The computer connects just fine to the free wifi we have at home, but in college, we have a little bit different system. There is wifi, but it is not free - everyone receives a user name and a password. I cant manage to estabilish this Pppoe connection - the computer "sees" where can it connect, but I dont know where to write my username and password. It is not the DSL connection, what I have already tried. Can you help me?

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  • Unity works on my PC but not on the Server. What did I miss?

    - by Erik France
    I have a web service using Microsoft Unity to hook the pieces together.  It all works fine on my PC but when I put it on the web server, I receive this error message: System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: The value of the property 'type' cannot be parsed. The error is: Method 'GetClaimsForUser' in type 'WebService.Implementation.ClaimsRetriever' from assembly 'WebService.Implementation, Version=1.0.0.0, Culture=neutral, PublicKeyToken=62cac0f1a908971a' does not have an implementation. If I look at the web.config, I see the following: <unity>     <typeAliases>       <typeAlias alias="ITokenGenerator" type="WebService.Interfaces.ITokenGenerator, WebService.Interfaces" />       <typeAlias alias="TokenGenerator" type="WebService.Implementation.TokenGenerator, WebService.Implementation" />       <typeAlias alias="IClaimsRetriever" type="WebService.Interfaces.IClaimsRetriever, WebService.Interfaces" />       <typeAlias alias="ClaimsRetriever" type="WebService.Implementation.ClaimsRetriever, WebService.Implementation" />       <typeAlias alias="TokenGeneratorSettings" type="WebService.Implementation.TokenGeneratorSettings, WebService.Implementation" />       <typeAlias alias="String" type="System.String, mscorlib" />     </typeAliases>     <containers>       <container>         <types>           <type type="ITokenGenerator" mapTo="TokenGenerator">             <typeConfig extensionType="Microsoft.Practices.Unity.Configuration.TypeInjectionElement, Microsoft.Practices.Unity.Configuration">               <constructor>                 <param name="retriever" parameterType="IClaimsRetriever">                   <dependency />                 </param>                 <param name="settings" parameterType="TokenGeneratorSettings">                   <dependency />                 </param>               </constructor>             </typeConfig>           </type>           <type type="IClaimsRetriever" mapTo="ClaimsRetriever">             <typeConfig extensionType="Microsoft.Practices.Unity.Configuration.TypeInjectionElement, Microsoft.Practices.Unity.Configuration">               <constructor>                 <param name="connectionStringName" parameterType="String">                   <value value="devDatabase" type="String" />                 </param>               </constructor>             </typeConfig>           </type>         </types>       </container>     </containers>   </unity> I have another web service, using an almost identical config running on the web server.  But this new web service will not run. Any ideas on what I have not told Unity to do?  Or maybe what I told Unity to do incorrectly?

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  • Pointer problem on external monitor

    - by Herby Pepper
    Pointer looks and work fine on laptop but when I connect external monitor it appears there as a shaking, square shape. Videos are not showing either. my laptop hp 2133: Graphic card: VIA Technologies, Inc. CN896/VN896/P4M900, Chrome 9 HC. System: Lubuntu 12.04 I think it is graphic problem but can't find drivers for my card and system. I do have xserver-xorg-video-openchrome and disper installed. I did not have that problem with Lubuntu 11.10. My problem is a bit like : Mouse pointer strange problem but it was not solved so I decided to post my question.

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  • How do I stop that launcher from popping up when mouse goes to the left edge?

    - by Michael
    This is what it says on the help.ubuntu.com website, but when i go to system settings, it does not have a Launcher & Menus option. I wish I could revert back to the old Ubuntu, I hate this launcher. Does any know a fix plz? "Stop the launcher from showing when I point to the left side of the screen The launcher unhides when you move your mouse or touchpad pointer to the left side of the screen. If you prefer, you can tell Unity to only show the launcher when you click the top left Ubuntu button instead. Click the icon at the very right of the top bar and select System Settings. In the Personal section, click Launcher & Menus. Choose Touches the top left corner of the screen"

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  • Mounting ntfs windows drive and retrieving its data

    - by Sarmad
    Hej, A friend gave me his laptop which had problems with booting (windows). He claims his data on the drive to be retrieved and saved. I have Linux Ubuntu Server to mount its hard drive and check the contents. Now when I have mounted it I see only boot.sdi, sources, System Volume Information I have no idea why is it so? How can I access and retrieve the contents? results of sudo fdisk -l are as follows: Enhet Start Början Slut Block Id System /dev/sdb1 2048 3074047 1536000 27 Hidden NTFS WinRE /dev/sdb2 * 3074048 246945791 121935872 7 HPFS/NTFS/exFAT /dev/sdb3 246945792 416354295 84704252 7 HPFS/NTFS/exFAT /dev/sdb4 416354304 488394751 36020224 f W95 Utökad (LBA) /dev/sdb5 416356352 488394751 36019200 7 HPFS/NTFS/exFAT Please help me in this regard.

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  • Synergy - easy share of keyboard and mouse between multiple computers

    Did you ever have the urge to share one set of keyboard and mouse between multiple machines? If so, please read on... Using multiple machines Honestly, as a software craftsman it is my daily business to run multiple machines - either physical or virtual - to be able to solve my customers' requirements. Recent hardware equipment allows this very easily. For laptops it's a no-brainer to attach a second or even a third screen in order to extend your native display. This works quite handy and in my case I used to attached two additional screens - one via HD15 connector, the other via HDMI. But... as it's a laptop and therefore a mobile unit there are slight restrictions. Detaching and re-attaching all cables when changing locations is one of them but hardware limitations, too. After all, it's a laptop and not a workstation. I guess, that anyone working in IT (or ICT) has more than one machine at their workplace or their home office and at least I find it quite annoying to have multiple sets of keyboard and mouse conquering my remaining space on my desk. Despite the ugly looks of all those cables and whatsoever 'chaos of distraction' I prefer a more clean solution and working environment. This allows me to actually focus on my work and tasks to do rather than to worry about choosing the right combination of keyboard/mouse. My current workplace is a patch work of various pieces of hardware (approx. 2-3 years): DIY desktop on Ubuntu 12.04 64-bit, Core2 Duo (E7400, 2.8GHz), 4GB RAM, 2x 250GB HDD, nVidia GPU 512MB Dell Inspiron 1525 on Windows 8 64-bit, 4GB RAM, 200GB HDD HP Compaq 6720s on Windows Vista 32-bit, Core2 Duo (T5670, 1.8GHz), 2GB RAM, 160GB HDD Mac mini on Mac OS X 10.7, Core i5 (2.3 GHz), 2GB RAM, 500GB HDD I know... Not the latest and greatest but a decent combination to work with. New system(s) is/are already on the shopping list but I live in the 'wrong' country to buy computer hardware. So, the next trip abroad will provide me with some new stuff. Using multiple operating systems The list of hardware above already names different operating systems, and actually I have only one preference: Linux. But still my job as a software craftsman for Visual FoxPro and .NET development requires other OSes, too. Not a big deal, it's just like this. Additionally to those physical machines, there are a bunch of virtual machines around. Most of them running either Windows XP or Windows 7. Since years I have the practice that each development for one customer is isolated into its own virtual machine and environment. This keeps it clean and version-safe. But as you can easily imagine with that setup there are a couple of constraints referring to keyboard and mouse. Usually, those systems require their own pieces of hardware attached. As stated, I don't like clutter on my desk's surface, so a cross-platform solution has to come in here. In the past, I tried it with various applications, hardware or network protocols like X11, RDP, NX, TeamViewer, RAdmin, KVM switch, etc. but the problem in this case is that they either allow you to remotely connect to the other system or exclusively 'bind' your peripherals to the active system. Not optimal after all. Synergy to the rescue Quote from their website: "Synergy lets you easily share your mouse and keyboard between multiple computers on your desk, and it's Free and Open Source. Just move your mouse off the edge of one computer's screen on to another. You can even share all of your clipboards. All you need is a network connection. Synergy is cross-platform (works on Windows, Mac OS X and Linux)." Yep, that's it! All I need for my setup here... Actually, I couldn't believe it myself that I didn't stumble over synergy earlier but 'Get over it' and there we go. And despite the fact that it is Open Source, no, it's also for free. Donations for the developers are very welcome and recently they introduced Synergy Premium. A possibility to buy so-called premium votes that can be used to put more weight / importance on specific issues or bugs that you would like the developers to look into. Installation and configuration Simply download the installation packages for your systems of choice, run the installer and enter some minor information about your network setup. I chose my desktop machine for the role of the Synergy server and configured my screen setup as follows: The screen setup allows you currently to build or connect up to 15 machines. The number of screens can be higher as those machine might have multiple screens physically attached. Synergy takes this into the overall calculations and simply works as expected. I tried it for fun with a second monitor each connected to both laptops to have a total number of 6 active screens. No flaws after all - stunning! All the other machines are configured as clients like so: Side note: The screenshot was taken on Windows 8 and pasted via clipboard into Gimp running on Ubuntu. Resume Synergy is now definitely in my box of tools for my daily work, and amongst the first pieces of software I install after the operating system. It just simplifies my life and cleans my desk. Never again without Synergy!Now, only waiting for an Android version to integrate my Galaxy Tab 10.1, too. ;-) Please, check out that superb product and enjoy sharing one keyboard, one mouse and one clipboard between your various machines and operating systems.

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  • Ubuntu Hangs Suddenly (Dell Latitude E5530)

    - by iFadey
    I recently bought (a month ago) Dell Latitude E5530 which comes pre-installed with Ubuntu 11.10. I removed Ubuntu 11.10 and installed 12.04 LTS right after the purchase. Everything worked out of box but occasionally Ubuntu completely hangs. The screen freezes and I can't even switch to other terminals by pressing (CTRL+ALT+F*). Whenever the screen freezes, CPU fan speed also increases. This is not happening when running particular applications. I mean it can hang without giving any reason or error displayed and while running any application. In short currently I can't able to reproduce system hang myself. I also want to mention that sometimes it never hangs complete day. Here are the specs of my laptop: Processor: Core i7-3520M CPU @ 2.90GHz Memory: 8GB HDD: 500GB, 7200rpm (Model=ST9500423AS) Graphics: Intel HD 4000 Operating System: Ubuntu 12.04 LTS (64-bit) Thanks!

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  • Strategy to use two different measurement systems in software

    - by Dennis
    I have an application that needs to accept and output values in both US Custom Units and Metric system. Right now the conversion and input and output is a mess. You can only enter in US system, but you can choose the output to be US or Metric, and the code to do the conversions is everywhere. So I want to organize this and put together some simple rules. So I came up with this: Rules user can enter values in either US or Metric, and User Interface will take care of marking this properly All units internally will be stored as US, since the majority of the system already has most of the data stored like that and depends on this. It shouldn't matter I suppose as long as you don't mix unit. All output will be in US or Metric, depending on user selection/choice/preference. In theory this sounds great and seems like a solution. However, one little problem I came across is this: There is some data stored in code or in the database that already returns data like this: 4 x 13/16" screws, which means "four times screws". I need the to be in either US or Metric. Where exactly do I put the conversion code for doing the conversion for this unit? The above already mixing presentation and data, but the data for the field I need to populate is that whole string. I can certainly split it up into the number 4, the 13/16", and the " x " and the " screws", but the question remains... where do I put the conversion code? Different Locations for Conversion Routines 1) Right now the string is in a class where it's produced. I can put conversion code right into that class and it may be a good solution. Except then, I want to be consistent so I will be putting conversion procedures everywhere in the code at-data-source, or right after reading it from the database. The problem though is I think that my code will have to deal with two systems, all throughout the codebase after this, should I do this. 2) According to the rules, my idea was to put it in the view script, aka last change to modify it before it is shown to the user. And it may be the right thing to do, but then it strikes me it may not always be the best solution. (First, it complicates the view script a tad, second, I need to do more work on the data side to split things up more, or do extra parsing, such as in my case above). 3) Another solution is to do this somewhere in the data prep step before the view, aka somewhere in the middle, before the view, but after the data-source. This strikes me as messy and that could be the reason why my codebase is in such a mess right now. It seems that there is no best solution. What do I do?

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  • A simple deployment example using Oracle Solaris 11

    - by Glynn Foster
    Last week I was over in Melbourne and Sydney to present at an Oracle Technology Network System Administration Day. During a set of morning sessions, I presented on some of the new things that we've done in Oracle Solaris 11 and our focus for the future. One of the sessions I presented was giving a quick technical overview of what a typical application deployment scenario would look like using technologies like the Image Packaging System (IPS), Service Management Facility (SMF), Oracle Solaris Zones, and network virtualization. While it's just a simple example, it provides the basic building blocks for a more advanced configuration that a data center would typically deploy. Given these would likely be of general interest, I thought I'd upload the slides for others to view - enjoy! You can download the original source PPTX without some of the formatting errors in the above.

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  • What do you think about gems and eggs? Alternatives?

    - by Juanlu001
    I've read recently some criticism (see 1, 2, 3) about the packaging distribution system of two popular programming languages: Ruby gems and Python eggs. The most important argument stated against them is that they replace the system package manager (in case there is one, as in every Linux distribution), which makes eggs and gems difficult to track, code difficult to patch, and so on. Are actually eggs and gems right? In case not, are there any alternatives to distributing Python or Ruby modules? Should developers focus on taking advantage of package manager (apt-get, pacman, ...) capabilities?

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  • How to Remotely Shut Down or Restart Windows PCs

    - by Chris Hoffman
    Windows includes Shutdown.exe, a simple utility for remotely shutting down or restarting Windows computers on your local network. To use Shutdown.exe, you must first configure the PCs you want to shut down or restart remotely. Once you’ve configured the PCs, you can use a graphical user interface or command to restart the PCs from another Windows system. You can even remotely shut down or restart the PCs from a Linux system. How To Properly Scan a Photograph (And Get An Even Better Image) The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage

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  • Black screen after installing Ubuntu 11.10

    - by Abbas
    I downloaded Ubuntu 11.10 one week ago and burned it to a CD. I installed it on my system which has a 1.5 TB hard. It installed successfully and I clicked on the restart button. The computer restarted and I chose the first option, which was to load Ubuntu. A black screen would appear with a cursor in top left hand side and I think the system was hung. I repeated this process by erasing the last Ubuntu install but I faced a similar problem. Can anybody help me?

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  • Top down space game control problem

    - by Phil
    As the title suggests I'm developing a top down space game. I'm not looking to use newtonian physics with the player controlled ship. I'm trying to achieve a control scheme somewhat similar to that of FlatSpace 2 (awesome game). I can't figure out how to achieve this feeling with keyboard controls as opposed to mouse controls though. Any suggestions? I'm using Unity3d and C# or javaScript (unityScript or whatever is the correct term) works fine if you want to drop some code examples. Edit: Of course I should describe FlatSpace 2's control scheme, sorry. You hold the mouse button down and move the mouse in the direction you want the ship to move in. But it's not the controls I don't know how to do but rather the feeling of a mix of driving a car and flying an aircraft. It's really well made. Youtube link: FlatSpace2 on iPhone I'm not developing an iPhone game but the video shows the principle of the movement style. Edit 2 As there seems to be a slight interest, I'll post the version of the code I've used to continue. It works good enough. Sometimes good enough is sufficient! using UnityEngine; using System.Collections; public class ShipMovement : MonoBehaviour { public float directionModifier; float shipRotationAngle; public float shipRotationSpeed = 0; public double thrustModifier; public double accelerationModifier; public double shipBaseAcceleration = 0; public Vector2 directionVector; public Vector2 accelerationVector = new Vector2(0,0); public Vector2 frictionVector = new Vector2(0,0); public int shipFriction = 0; public Vector2 shipSpeedVector; public Vector2 shipPositionVector; public Vector2 speedCap = new Vector2(0,0); void Update() { directionModifier = -Input.GetAxis("Horizontal"); shipRotationAngle += ( shipRotationSpeed * directionModifier ) * Time.deltaTime; thrustModifier = Input.GetAxis("Vertical"); accelerationModifier = ( ( shipBaseAcceleration * thrustModifier ) ) * Time.deltaTime; directionVector = new Vector2( Mathf.Cos(shipRotationAngle ), Mathf.Sin(shipRotationAngle) ); //accelerationVector = Vector2(directionVector.x * System.Convert.ToDouble(accelerationModifier), directionVector.y * System.Convert.ToDouble(accelerationModifier)); accelerationVector.x = directionVector.x * (float)accelerationModifier; accelerationVector.y = directionVector.y * (float)accelerationModifier; // Set friction based on how "floaty" controls you want shipSpeedVector.x *= 0.9f; //Use a variable here shipSpeedVector.y *= 0.9f; //<-- as well shipSpeedVector += accelerationVector; shipPositionVector += shipSpeedVector; gameObject.transform.position = new Vector3(shipPositionVector.x, 0, shipPositionVector.y); } }

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  • Why do HDFS clusters have only a single NameNode?

    - by grautur
    I'm trying to understand better how Hadoop works, and I'm reading The NameNode is a Single Point of Failure for the HDFS Cluster. HDFS is not currently a High Availability system. When the NameNode goes down, the file system goes offline. There is an optional SecondaryNameNode that can be hosted on a separate machine. It only creates checkpoints of the namespace by merging the edits file into the fsimage file and does not provide any real redundancy. Hadoop 0.21+ has a BackupNameNode that is part of a plan to have an HA name service, but it needs active contributions from the people who want it (i.e. you) to make it Highly Available. from http://wiki.apache.org/hadoop/NameNode So why is the NameNode a single point of failure? What is bad or difficult about having a complete duplicate of the NameNode running as well?

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