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  • Big Data – Buzz Words: What is HDFS – Day 8 of 21

    - by Pinal Dave
    In yesterday’s blog post we learned what is MapReduce. In this article we will take a quick look at one of the four most important buzz words which goes around Big Data – HDFS. What is HDFS ? HDFS stands for Hadoop Distributed File System and it is a primary storage system used by Hadoop. It provides high performance access to data across Hadoop clusters. It is usually deployed on low-cost commodity hardware. In commodity hardware deployment server failures are very common. Due to the same reason HDFS is built to have high fault tolerance. The data transfer rate between compute nodes in HDFS is very high, which leads to reduced risk of failure. HDFS creates smaller pieces of the big data and distributes it on different nodes. It also copies each smaller piece to multiple times on different nodes. Hence when any node with the data crashes the system is automatically able to use the data from a different node and continue the process. This is the key feature of the HDFS system. Architecture of HDFS The architecture of the HDFS is master/slave architecture. An HDFS cluster always consists of single NameNode. This single NameNode is a master server and it manages the file system as well regulates access to various files. In additional to NameNode there are multiple DataNodes. There is always one DataNode for each data server. In HDFS a big file is split into one or more blocks and those blocks are stored in a set of DataNodes. The primary task of the NameNode is to open, close or rename files and directory and regulate access to the file system, whereas the primary task of the DataNode is read and write to the file systems. DataNode is also responsible for the creation, deletion or replication of the data based on the instruction from NameNode. In reality, NameNode and DataNode are software designed to run on commodity machine build in Java language. Visual Representation of HDFS Architecture Let us understand how HDFS works with the help of the diagram. Client APP or HDFS Client connects to NameSpace as well as DataNode. Client App access to the DataNode is regulated by NameSpace Node. NameSpace Node allows Client App to connect to the DataNode based by allowing the connection to the DataNode directly. A big data file is divided into multiple data blocks (let us assume that those data chunks are A,B,C and D. Client App will later on write data blocks directly to the DataNode. Client App does not have to directly write to all the node. It just has to write to any one of the node and NameNode will decide on which other DataNode it will have to replicate the data. In our example Client App directly writes to DataNode 1 and detained 3. However, data chunks are automatically replicated to other nodes. All the information like in which DataNode which data block is placed is written back to NameNode. High Availability During Disaster Now as multiple DataNode have same data blocks in the case of any DataNode which faces the disaster, the entire process will continue as other DataNode will assume the role to serve the specific data block which was on the failed node. This system provides very high tolerance to disaster and provides high availability. If you notice there is only single NameNode in our architecture. If that node fails our entire Hadoop Application will stop performing as it is a single node where we store all the metadata. As this node is very critical, it is usually replicated on another clustered as well as on another data rack. Though, that replicated node is not operational in architecture, it has all the necessary data to perform the task of the NameNode in the case of the NameNode fails. The entire Hadoop architecture is built to function smoothly even there are node failures or hardware malfunction. It is built on the simple concept that data is so big it is impossible to have come up with a single piece of the hardware which can manage it properly. We need lots of commodity (cheap) hardware to manage our big data and hardware failure is part of the commodity servers. To reduce the impact of hardware failure Hadoop architecture is built to overcome the limitation of the non-functioning hardware. Tomorrow In tomorrow’s blog post we will discuss the importance of the relational database in Big Data. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Big Data, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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  • Discount Multilingual Day in the Life of User Experience

    - by ultan o'broin
    Super article by the WikiMedia Foundation engineering folks about Designing for the Multilingual Web using the Wikipedia Universal Language Selector user interface as an example. Great ideas about tools that are available, as well as covering the basics of wireframing (mockups), prototyping, and user testing. Lots of inspiration there for developers and builders of apps who want to ensure their user experience (UX) really delivers for a global audience. Check out the use of the Firefox-based Pencil, how to translate your mockups, and how to perform remote user testing using Google+ Hangouts. Paul Giner demonstrates how to translate mockups. A little clunky and homespun in parts (I would prefer if tools such as Pencil or Balsamiq MockUps, and so on, could roundtrip directly from SVG to XLIFF for example, and Pencil doesn't work yet with the latest versions for Firefox) and I am not sure how it can really scales to enterprise-level use. However, the UX methodology is basically sound, and reinforces the importance of designing and testing in more that one language. The most powerful message for me is that you do not need special resources, training or expensive tools to deliver great-looking usable apps if you're a developer. Definitely worth considering if you're building apps out there in the community.

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  • Virtual Developer Day: Oracle Fusion Development

    - by mseika
    Get up to date and learn everything you wanted to know about Oracle ADF & Fusion Development plus live Q&A chats with Oracle technical staff. Oracle Application Development Framework (ADF) is the standards based, strategic framework for Oracle Fusion Applications and Oracle Fusion Middleware. Oracle ADF's integration with the Oracle SOA Suite, Oracle WebCenter and Oracle BI creates a complete productive development platform for your custom applications. Join us at this FREE virtual event and learn the latest in Fusion Development including: Is Oracle ADF development faster and simpler than Forms, Apex or .Net? Mobile Application Development with ADF Mobile Oracle ADF development with Eclipse Oracle WebCenter Portal and ADF Development Application Lifecycle Management with ADF Building Process Centric Applications with ADF and BPM Oracle Business Intelligence and ADF Integration Live Q&A chats with Oracle technical staff Developer lead, manager or architect – this event has something for everyone. Don't miss this opportunity December 11th, 2012 9:00 – 13:00 GMT 10:00 – 14:00 CET 12:00 – 16:00 AST 13:00 – 17:00 MSK 14:30 – 18:30 IST Register online now for this FREE event! Agenda 9:00 a.m. – 9:30 a.m. Opening 9:30 a.m. – 10:00 a.m. Keynote Oracle Fusion Development Track 1 Introduction to Fusion Development Track 2 What's New in Fusion Development Track 3 Fusion Development in the Enterprise Track 4 Hands On Lab - WebCenter Portal and ADF Lab w/ JDeveloper 10:00 a.m. – 11:00 a.m. Is Oracle ADF development faster and simpler than Forms, Apex or .Net? Mobile Application Development with ADF Mobile Oracle WebCenter Portal and ADF Development Lab materials can be found on event wiki here. Q&A about the lab is available throughout the event. 11:00 a.m. – 12:00 p.m. Rich Web UI made simple – an ADF Faces Overview Oracle Enterprise Pack for Eclipse - ADF Development Building Process Centric Applications with ADF and BPM 12:00 p.m. – 1:00 p.m. Next Generation Controller for JSF Application Lifecycle Management for ADF Oracle Business Intelligence and ADF Integration View Session Abstracts We look forward to welcoming you at this free event!

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  • APress Deal of the Day 22/Dec/2010 - Pro BAM in BizTalk Server 2009

    - by TATWORTH
    Another $10 bargain from Apress available to 08:00 UTC on Dec/23 Pro BAM in BizTalk Server 2009 Business Activity Monitoring, or BAM, provides real-time business intelligence by capturing data as it flows through a business system. By using BAM, you can monitor a business process in real time and generate alerts when the process needs human intervention. Pro Business Activity Monitoring in BizTalk 2009 focuses on Microsoft's BAM tools, which provide a flexible infrastructure that captures data from Windows Communication Foundation, Windows Workflow Foundation, .NET applications, and BizTalk Server. $49.99 | Published Jul 2009 | Jeff Sanders

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  • There's A Virtual Developer Day in Your Future

    - by OTN ArchBeat
    What are Virtual Developer Days? You really should know this by now. OTN Virtual Developer Days are online events created specifically for developers and architects, with a focus on no-fluff technical presentations, hands-on labs, and expert Q&A to sharpen your technical skills and bring you up to speed on the latest information on Oracle products and practical best practices for their use. The best part about OTN Virtual Developer Days is that you don't have to pack a suitcase or stand in line at an airport waiting for someone pat you down. Instead, you stay where you are, flip open your laptop, and prepare your brain for a massive skills injection. In the next few weeks you'll have two such chances to ramp up your skills. On Tuesday November 5, 2013 Harnessing the Power of Oracle WebLogic and Oracle Coherence will guide you through tooling updates and best practices for developing applications with WebLogic and Coherence as target platforms. This two-track event covers app design and development (Track 1) and building, deploying, and managing applications (Track 2). Each track includes three presentations plus a hands-on lab. [9am-1pm PT / 12pm-4pm ET / 1pm-5pm BRT] Register now This event will also be available in EMEA on December 3, 2013 {9am-1pm GMT / 1pm-5pm GST / 2:30pm-6:30 PM IST] On Tuesday November 19, 2103 Oracle ADF Development: Web, Mobile, and Beyond offers four tracks covering everything from the basics to advance skills for for application development using Oracle ADF and Oracle ADF Mobile. There are three sessions in each track, followed by hands-on labs in which try out what you've learned. [9am-1pm PT / 12pm-4pm ET/ 1pm-5pm BRT] Register now This event will also be available in APAC on Thursday November 21, 2013 [10am-1:30pm IST (India) / 12:30pm-4pm SGT (Singapore) / 3:30pm-7pm AESDT] and in EMEA on Tuesday November 26, 2013 [9am-1pm GMT / 1pm-5pm GST/ 2:30pm-6:30pm IST] Registration for both events is absolutely free. So what are you waiting for?

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  • Day 2 of Oracle OpenWorld 2012 October 1st

    - by Maria Colgan
    Oracle OpenWorld started yesterday and San Francisco is just buzzing with Oracle folks! If you are attending the conference don't miss the opportunity to chat with the Optimizer development team at one of our technical sessions or at the Oracle Demo grounds. Our first technical session(Session CON8455) happens tomorrow at 1:15pm but the Oracle Optimizer Demo booth opens today. We are located in the database demo grounds, in Moscone South, booth number 3157. Members of the Optimizer team will be available from 9:45am to 6pm today, to answer any Optimizer questions you might have and of course to dole out our limited edition Optimizer bumper stickers! The must have souvenir from this years conference +Maria Colgan

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  • Endeca Information Discovery 3-Day Hands-on Training Workshop

    - by Mike.Hallett(at)Oracle-BI&EPM
    For Oracle Partners, on October 3-5, 2012 in Milan, Italy: Register here. Endeca Information Discovery plays a key role with your big data analysis and complements Oracle Business Intelligence Solutions such as OBIEE. This FREE hands-on workshop for Oracle Partners highlights technical know-how of the product and helps understand its value proposition. We will walk you through four key components of the product: Oracle Endeca Server—A highly scalable, search-analytical database that derives the data model based on the data presented to it, thereby reducing data modeling requirements. Studio—A highly interactive, component-based user interface for configuring advanced, yet intuitive, analytical applications. Integration Suite—Provides rapid unification and enrichment of diverse sources of information into a single integrated view. Extensible Value-Added Modules—Add-on modules that provide value quickly through configuration instead of custom coding. Topics covered will include Data Exploration with Endeca Information Discovery, Data Ingest, Project Lifecycle, Building an Endeca Server data model and advanced modeling techniques, and Working with Studio. Lab Outline The labs showcase Oracle Endeca Information Discovery components and functionality by providing expertise on features and know-how of building such applications. The hands-on activities are based on a Quick Start application provided during the class. Audience Oracle Partners, Big Data Analytics Developer and Architects BI and EPM Application Developers and Implementers, Data Warehouse Developers Equipment Requirements This workshop requires attendees to provide their own laptops for this class. Attendee laptops must meet the following minimum hardware/software requirements: Hardware 8GB RAM is highly recommended (Windows 64 bit Machine is required) 40 GB free space (includes staging) USB 2.0 port (at least one available) Software One of the following operating systems: 64-bit Windows host/laptop OS (Windows 7 or Windows Server 2008) 64-bit host/laptop OS with a Windows VM (Server, or Win 7, BIC2g, etc.) Internet Explorer 8.x , Firefox 3.6 or Firefox 6.0 WINRAR or 7ziputility to unzip workshop files: Download-able from http://www.win-rar.com/download.html Download-able from http://www.7zip.com/ Oracle Endeca Information Discovery Workshop Register here: October 3-5, 2012: Cinisello Balsamo, Milan.  We will confirm with you your place within 2 weeks. Questions?  Send email to: [email protected]  :  Oracle Platform Technologies Enablement Services.

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  • Valentine's Day in sunny Ottawa, Ontario

    - by Roy F. Swonger
    Birds may fly south for the winter, but I will be heading to Ottawa, Ontario next week for a workshop on 15-FEB. I'm pretty used to winter because I grew up in the snow belt southeast of Buffalo, NY -- and this winter in New England is helping me get prepared as well. For reference, the big lump is my gas grill. Anyway, I'm looking forward to a good workshop and to visiting Ottawa for my first time. If you're in the Ottawa/Gatineau area and would like to attend, please contact your account team for more information.

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  • How ReSharper saved the day

    - by Randy Walker
    The Back Story: As a Microsoft MVP awardee, one of the many benefits is free software, books, and various products.  Some of the producers/manufacturers ask for reviews in exchange, others just ask for a brief mention (nothing is ever really free).  But considering that some of the products are essential to my everyday computing, I never mind mentioning their names and evangelizing their products. One of these tools just happened to save me a countless number of hours.  With the release of Microsoft’s Visual Studio 2010, JetBrains released their new 5.0 version of ReSharper. The Story: My specialty is Visual Basic development.  I am not, and probably will never be a C# developer.  As such, trying to figure out how to debug a C# project, that was written 2 years ago by a contract developer, let’s just say it’s a painful process. I have a special class for config file reading and writing, written in C#.  I kept getting exceptions when the reader would get to a line that had an xml comment in it.  It took me a couple of hours to narrow down where it was happening and why, but I couldn’t figure out the best way to fix it.  It was a for loop that was implicitly casting the type of the variable.  I knew I need to explicitly cast the variable type, but only after the type was verified.  So after I finally got some of the code written, ReSharper gave me some suggestions on how to write the code better. One of the ways was to safely cast the variable into the type I wanted.  Blammo, no more exceptions in a way I hadn’t anticipated.  Instead of having to check the type before I cast it.  Beautiful, simple, and taught me a better way to code C#. Kudos JetBrains … now if it only worked better with VB (then it could be called ReBasic, ReVB, RE???)

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  • Oracle Developer Day: Die Oracle Datenbank in der Praxis

    - by A&C Redaktion
    Im neuen Jahr finden wieder Oracle Developer Days in verschiedenen Städten statt! In dieser speziell von den Database-Kollegen zusammengestellten Veranstaltung erfahren Sie viele Tipps und Tricks aus der Praxis und werden zu folgenden Themen auf den neuesten Stand gebracht: Die Unterschiede der Editionen und ihre Geheimnisse Umfangreiche Basisausstattung auch ohne Option Performance und Skalierbarkeit in den einzelnen Editionen Kosten- und Ressourceneinsparung leicht gemacht Sicherheit in der Datenbank Steigerung der Verfügbarkeit mit einfachen Mitteln Der Umgang mit großen Datenmengen Cloud Technologien in der Oracle Datenbank Ein Ausblick auf die Funktionen der für 2013 geplanten neuen Datenbank-Version rundet den Workshop ab. Termine, Agenda,Veranstaltungsorte und Anmeldung finden Sie hier. Melden Sie sich noch heute zur Veranstaltung an - die Teilnahme ist kostenlos!

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  • Erland Sommarskog: DBA of the Day

    Erland is best known for his famous SQL Server site http://www.sommarskog.se/. It is plain, it has eight articles in it, it is short on jokes: However, it is hugely popular and one of the great 'essential' SQL Server sites. We sent Richard Morris to find out more about Erland, and he discovered a diligent and energetic teacher and mentor in the SQL Server Community....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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  • OTN's Virtual Developer Day: Deep dive on WebLogic and Java EE 6

    - by ruma.sanyal
    Come join us and learn how Oracle WebLogic Server enables a whole new level of productivity for enterprise developers. Also hear the latest on Java EE 6 and the programming tenets that have made it a true platform breakthrough, with new programming paradigms, persistence strategies, and more: Convention over configuration - minimal XML Leaner and meaner API - and one that is an open standard POJO model - managed beans for testable components Annotation-based programming model - decorate and inject Reduce or eliminate need for deployment descriptors Traditional API for advanced users How to participate: register online, and we'll email you the details.

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  • Women In, Near, and Around Ubuntu - Celebrating Ada Lovelace Day - Part 1

    <b>Ubuntu User:</b> "I have been given the opportunity to meet and get to know so many amazingly talented and skilled women who are in Open Source and more specifically the Ubuntu Community. The women I am writing about make the work and contributions they provide to Ubuntu, Open Source Projects, and initiatives to increase the visibility of women in open source, seem effortlessly awesome!"

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  • The Enterprise Architect (EA) diary - day 22 (from business processes to implemented applications)

    - by nattYGUR
    After spending time on keeping our repository up to date (add new ETRM application and related data flows as well as changing databases to DB clusters), collecting more data for the root cause analysis and spending time for writing proposal to creating new software infrastructure team ( that will help us to clean the table from a pile of problems that just keep on growing due to BAU control over IT dev team resources). I spend time to adapt our EA tool to support a diagram flow from high level business processes to implementation of new applications that will better support the business process. http://www.theeagroup.net/ea/Default.aspx?tabid=1&newsType=ArticleView&articleId=195

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  • SharePoint MVP Chat tomorrow and day after

    - by Sahil Malik
    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). Catch me in chat style talking about SharePoint 2010, along with a number of accomplished individuals on April 27th, 4PM PST.There will be another chat on April 28th, 2010 at 9AM PST. For more details, please see http://blogs.msdn.com/oallen/archive/2010/04/26/sharepoint-mvp-question-and-answer-session-part-deux.aspx See you there :) Comment on the article ....

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  • SharePoint MVP Chat tomorrow and day after

    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). This feed URL has been discontinued. Please update your reader's URL to : http://feeds.feedburner.com/winsmarts Read full article .... ...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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  • Oracle Cloud Applications Day 2013, grazie!

    - by claudiac.caramelli
    Un po' di numeri: 1 plenaria divisa su 2 sale, 4 sessioni parallele pomeridiane, più di 400 partecipanti. La giornata di lunedì ha visto una location piena di persone interessate al tema Cloud e al mondo Oracle. Un'altra nota positiva: l'hashtag #CloudDayIt è stato costantemente tra i primi posti dei trend topic della mattinata, grazie a tutti coloro che hanno twittato e retwittato le frasi più importanti della giornata, permettendo così che l'esperienza Oracle fosse ancora più complete! Perciò grazie a tutti coloro che hanno contribuito alla realizzazione di questo grande evento!

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  • Prosit Neujahr, auf ein schönes und erfolgreiches Jahr 2011!

    - by A&C Redaktion
    Wir hoffen, Sie sind gut im neuen Jahr angekommen und wünschen Ihnen für 2011 alles Gute, Gesundheit und natürlich ein erfolgreiches Geschäftsjahr!Hinter Oracle Alliances & Channels liegt ein Jahr voller Herausforderungen und wir freuen uns darauf, 2011 an die gute und vertrauensvolle Zusammenarbeit mit unseren Partnern anzuknüpfen. Im Januar starten wir gleich mit einem großen Partner-Event ins neue Jahr, demOPN Day Virtual am 24. Januar 2011Von 14 bis 17 Uhr dreht sich dort alles um die Spezialisierung: Von den ersten Schritten, über den Nutzen bis hin zu Erfahrungsberichten einzelner Partner wird das OPN Specialized von allen Seiten beleuchtet. Zum Fragenstellen laden die Q&A-Sessions ein, beliebt ist außerdem die Networking Lounge, in der sich Partner und Interessierte individuell austauschen und vernetzen können.Was sonst noch passiert, im Jahr 2011, das steht laufend aktualisiert im Oracle Channel Event Calender.

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  • Apress Deal of the Day - 14/Mar/2011

    - by TATWORTH
    v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 false false false EN-GB X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} jQuery Recipes: A Problem-Solution Approach jQuery is one of today’s most popular JavaScript web application development frameworks and libraries. jQuery Recipes can get you started with jQuery quickly and easily, and it will serve as a valuable long-term reference. $44.99 | Published Jan 2010 | Bintu Harwani

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  • TechEd 2010 Day Four: Learning how to help others learn

    - by BuckWoody
    I do quite a few presentations, and teach at the University of Washington, and also teach other classes. But I'm always learning from others how to help others learn. At events like TechEd I have access to some of the best speakers around, so I try to find out what they do that works. I attended a great session by allen White, in which he demonstrated a set of PowerShell scripts. He said that Dan Jones of the Microsoft Manageability team told him while he demonstrated a script he needed to provide some visual way to represent the process. Allen used one of the oldest visualizations around - a flowchart. It was the first time I'd seen one used to illustrate a PowerShell script, and it was very effective. I'm totally stealing the idea. All of us are teachers - we help others on our team understand what we're up to. Make sure you make notes for what you find effective in dealing with you, and then meld that into your own way of teaching. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Evi Nemeth (an Ada Lovelace day tribute)

    <b>LWN.net:</b> "The chief of the Unix side was Evi Nemeth. The first thing that struck most people about Evi was a general sense of distraction and disorganization; it's only later that one realized the she was one of those smart people who make things happen."

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  • Backup and Recovery of Windows 8 - Tip-of-the-Day

    - by KeithMayer
    Have you recently downloaded Windows 8 RTM? In this article, we'll introduce you to the new options available for making Backup and Recovery in Windows 8 easier than ever, including Windows 8 File History, launching Windows System Backup and Windows 8 Refresh & Reset PC. Use these options to define your backup and recovery plan so that you'll be prepared to restore the system and your data when needed.

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