You are reading the article Windows 8 License Sales Hit 60 Million updated in December 2023 on the website Daihoichemgio.com. We hope that the information we have shared is helpful to you. If you find the content interesting and meaningful, please share it with your friends and continue to follow and support us for the latest updates. Suggested January 2024 Windows 8 License Sales Hit 60 Million
Microsoft has sold 60 million Windows 8 licenses, a sales bump of 20 million units since late November when Windows 8 hit 40 million licenses sold. Microsoft’s sales number includes upgrades and sales to its manufacturing partners since it introduced the new touch-centric operating system 10 weeks ago, the company said at an event during CES Tuesday. Microsoft says the sales trajectory is similar to Windows 7. Microsoft in 2010 called Windows 7 the fastest-selling operating system in history after it sold more than 60 million licenses within the first 74 days of sales.
While the Windows 8 sales numbers sound impressive, it’s not clear whether Windows 8 licensing sales are translating into computer and tablet purchases at computer shops and big box stores across the country. Except for the Surface tablet, Microsoft’s sales include licensing deals with computer manufacturers. Microsoft, for example, will sell Windows 8 licenses to Samsung that the computer maker installs on devices like the Samsung Ativ PC, and those licenses count as sales for Microsoft. The same goes for licensing sales to Dell, Hewlett-Packard, Sony, and every other computer manufacturer. It’s then up to those companies, with some marketing support from Microsoft, to get new Windows 8 devices in the hands of customers.
And that may not be happening quite yet. Windows 8 did little to boost holiday sales for notebooks, according to market research firm NPD, which tracks point-of-sale transactions across the U.S. In November, NPD also noted that Windows 8 was not boosting PC sales overall. Other critics are also arguing that Windows 8 is off to a slow start, and some reports claim that internally Microsoft is disappointed about the adoption rate of Windows 8 thus far.
Windows 8’s struggles could be caused by many factors and are a far cry from the problems that dogged Microsoft Vista, which only surpassed 60 million licenses sold after six months of availability. The most obvious problem could be Windows 8’s radical shift in user interface that includes a touch-centric start screen that relegates the traditional desktop to second-class status. High-priced devices also seem to be a major stumbling block, but critical opinion is split over whether Windows 8 PC prices need to go up or down to solve this problem.
Scarce availability of touchscreen laptops may have also played a role in Windows 8’s troubles. Hybrid laptops were scarce through the holiday season in what seemed to be a shortage of touch components. And ZDNet’s Mary Jo Foley noted on Tuesday that the lack of touch-enabled laptops and tablets may have hurt Windows 8’s initial adoption.
“There just doesn’t seem to be a lot of excitement around PCs overall right now,” said Michael Silver, research vice president for market research firm Gartner. “It looks like Windows 8 was good enough to hold the market until the next version comes out. That version should fix a lot of things that are wrong with Windows 8 and maybe the rest of the ecosystem will be better-prepared by then.”
Microsoft is rumored to be working on a major Windows refresh, dubbed Windows Blue, set to debut in mid-2013. It’s not clear if Blue is an update to Windows 8 or a replacement for the current OS. If reports are accurate, Blue would introduce a yearly release cycle for Microsoft’s operating system.
Many analysts point to mid-2013 and into early 2014 as the most likely time to expect an uptick in Windows 8, or perhaps Windows Blue, adoption.
Until then, manufacturers and people upgrading older machines seem to be adopting Windows 8 close to the same rate as the early days of Windows 7.
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Why Windows Rt Is Crucial For Microsoft Despite Sagging Sales
Don’t shed a tear for Windows RT, the neutered operating system cursed to be the red-headed stepchild of the Windows family (to Windows Phone’s great relief). While the OS’s rocky birth has since led to an even rockier childhood, its very existence is a clever ploy for the future by Microsoft—even though you can’t give Windows RT tablets away today.
Body blow after body blowIt’s all too easy to feel bad for Windows RT. Designed specifically for use with mobile-focused ARM processors rather than with the x86-based chips that traditional computers use, Windows RT devices can run only apps designed for the touch-friendly modern UI. Classic desktop programs simply won’t work on Windows RT.
But beyond those technical restrictions, the OS has suffered from an astounding level of neglect. The Windows Store—the very lifeblood of Windows RT and the entire modern UI—still fails to impress. With few stellar apps to attract users and no ability to run desktop software, Windows RT hasn’t been a hit with consumers. IDC estimates that just 200,000 Windows RT devices shipped in the first quarter, and most of those were Microsoft’s own Surface RT tablet.
A tablet with the Windows Store open, sitting on a big, empty expanse—now there’s an appropriate visual metaphor.
Unable to sell Windows RT slates, many manufacturers have stopped making them altogether. Software developers aren’t exactly lining up to support the modern UI, either. Big-name game studios have turned up their noses at the Windows Store’s walled garden. Apple recently dismissed the idea of porting iTunes to Windows 8/RT. The OS was shunned at CES, Computex, and Microsoft’s own Build 2013 keynote.
The hits just keep coming for Windows RT. But here’s the thing: Even though ARM-powered tablets have flopped on the market thus far, they’ve already had a huge impact on Windows tablets overall, and their role can only increase going forward.
Sipping power“For Microsoft, Windows RT is a long-term, strategic play,” says Patrick Moorhead, founder and principal analyst of Moor Insights and Strategy.
That long-term play is already paying dividends in the short term, however. Part of the reason ARM is so successful in the mobile realm is because the reference chips it designs and licenses to manufacturers are absolute wonders of energy efficiency.
Dell’s Ivy Bridge-based XPS 12 was a wonderful hybrid—but compared to tablets, it delivered atrocious battery life.
Battery life isn’t everything to smartphones and tablets, but it’s definitely at the top of the list—and the x86 processors that Intel and AMD traditionally made weren’t competitive on the power front. The Intel Core processor-powered hybrids available at around the time of Windows 8’s launch struggled to reach 5 hours of battery life. (See: Microsoft’s Surface Pro, Dell’s XPS 12, Lenovo’s IdeaPad Yoga 13, and many more.) That’s decent longevity for an Ultrabook, but it doesn’t cut it for a tablet. Stand-alone Android and Apple slates routinely last longer than 8 hours on a single charge.
Shortly after Windows 8 and Windows RT launched, however, Intel released its x86-based “Clover Trail” Atom chip, which runs the full Windows 8 operating system and lasts all day long. Soon, slates like the Samsung ATIV Smart PC and the Acer Iconia W510 appeared, offering classic desktop functionality and 8-plus hours of endurance. Windows 8 tablets suddenly boomed, while Windows RT tablets waned, robbed of their major point of differentiation.
Don’t think Intel’s sudden energy expertise was a stroke of serendipity, though.
Chip development takes years, and Intel was no doubt dreamed up Clover Trail shortly after it became apparent that tablets were here to stay, but the Windows RT stick provided a harsh counterpoint to the Windows 8 carrot. Intel had two years to bolster its power efficiency in the wake of Windows RT’s unveiling.
Both AMD and Intel have doubled down on power efficiency to combat the threat of ARM and Windows RT.
“Windows RT is designed to give Intel something to think about in terms of their power efficiency and performance at that lower power level,” says Moorhead. “In essence, to keep them a little bit honest. I did see a remarkable improvement in Intel’s low-power silicon as soon as Windows RT and [Microsoft’s] support for the ARM architecture was announced.”
Funny how that happened—and how it’s continuing to happen, in the form of Intel’s upcoming “Silvermont” Atom architecture as well as its recently released Haswell processor, both of which emphasize power efficiency. AMD is sharpening its mobile focus, too.
Yes, we’re nearing the point where hybrids may quench your thirst for tablets—and it wouldn’t have happened quite so quickly without Windows RT.
How WinRT will help Windows RTWindows RT is playing another crucial role in the future of the Windows ecosystem, though that future looks bleak today. Yes, I’m talking about the Windows Store.
All the talk of cross-platform bliss that permeated the Build 2013 conference and a substantial portion of Microsoft’s recent efforts revolve around the ability of various bits of the Windows ecosystem to talk with one another. The modern UI and all of its apps run on the Windows Runtime/WinRT application architecture. Not to be confused with the Windows RT operating system (curse your naming schemes, Microsoft!), Windows Runtime supports several programming languages and runs just fine on x86 and ARM processors alike. (Microsoft handsets run a variant dubbed Windows Phone Runtime.) Michael HomnickIf Windows Phone and Windows desktop ever unite their app stores, it’ll be thanks to the underlying WinRT structure.
That’s crucial. As modern apps become available, they’ll be able to run on a much more varied array of hardware, especially as Microsoft ties Windows proper ever closer to the rest of its ecosystem.
Not only does that mean more choice for consumers in the long run, it also means more flexibility for Microsoft. As such longstanding partners of the company as Intel and AMD flirt with Android, Windows RT and the modern UI’s underlying WinRT application architecture help Microsoft build for a future with open options.
Therein lies the genius of Microsoft’s Trojan horse. Every copy of Windows 8 sold includes that somewhat tacked-on modern interface. The more Windows 8 users there are, the more likely developers are to stuff the Windows Store with apps—and since the Windows Store (mostly) features WinRT apps rather than classic x86-based programs, Windows RT becomes stronger over time even if no one buys the tablets today.
“Over the long term, I think within three years we’ll most likely see a full catalog of Metro-based Windows applications,” says Moorhead.
Like I said: Genius. And Microsoft is pushing the Windows Store hard.
At Build, Microsoft announced modern versions of big-name apps like Facebook, Flipboard, and Foursquare for Windows. And while Windows RT specifically wasn’t on show at Microsoft’s Build keynote, a key cornerstone of its future was, in the form of an alpha build of modern-style Office apps.
Windows co-chief Julie Larson-Green showing off modern PowerPoint at the Build 2013 keynote.
“Microsoft announcing Metro Office, or at least showing PowerPoint for Windows RT in the modern UI, is—to me—the absolute message that Metro is the future, and the desktop is the past [for Microsoft],” says Moorhead. “While I think that Microsoft may have said that previously, their actions speak a lot louder than their words. In a way, Microsoft was hedging their bets with the desktop. But them doing Office in Metro speaks volumes.”
Onward and touchwardThe death of the desktop isn’t imminent, but it’s not hard to see its ending writ large in Microsoft’s actions.
Microsoft is in it for the long haul with Windows 8 and the modern UI. Windows RT’s own star will shine more brightly as that duo ascends. In the meantime, Windows RT’s mere existence spurs traditional Windows laptops and hybrids toward longer-lasting charges and better cross-platform compatibility. Not bad for a platform that should, by most measures, be languishing on the vine.
In fact, its future boils down to a simple war of wills: Can Microsoft’s stubborn modern focus outlast consumer demand for the desktop? Only time can answer that question.
Bsplayer Works For Windows 8, Windows 10: Don’t Worry
BSPlayer Works for Windows 8, Windows 10: Don’t Worry
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Many of my friends think that most of the actual software won’t work with Windows 8, and nothing could be further from the truth than that. You should perform a compatibility test, to see if your PC and the programs installed on it will work with Windows 10, Windows 8, but chances are that you are worrying for nothing. The same is true for BSPlayer.
BSplayer for Windows 10, Windows 8[Update]
The last version of BSplayer (2.71) has been released in May 2023. There were no major design or technical changes. However, the developers improved codec support and fixed many bugs for Windows 10 version. The users can download this update by installing the basic version of BSplayer.
In order to get the best of BSplayer for Window 8, you just need to download the version that suits you better. There is the free and there is the PRO version. For those that are in love with the Modern UI of Windows 10, Windows 8, sadly, there’s no dedicated BSplayer app for that, and you’ll have to resort to the desktop version. Here are some of the features you’ll be getting with BSplayer, the free edition, for Windows 10, Windows 8:
Automatic online subtitles search and download (new feature and I’m absolutely in love with it)
Fully skinnable user interface
Capture frame from video and save it to jpeg image
Display embedded images and lyrics in mp3 files (new feature, music freaks will love it)
Those who will be paying to get the PRO version will get some extra features and with their purchase will also be supporting the work of developers. BSplayer has been my favorite movie player since I’ve known myself of using the computer, and now, with the appearance of Windows 10, Windows 8, it’s here, as well. While it’s so basic, you can actually use it as a DVD player app in Windows 10.
I only wish I could include it on the list with the best movie apps in Windows 10, Windows 8.
Possible issues with BSPlayer in Windows 10, Windows 8The reason why so many people search for BS Player on Windows 10, Windows 8 is that some of them experience unpleasant issues. As always, whenever a new Windows is out in the wild, it takes a while to iron out all the minuses. And BS Player is no exception, unfortunately. One such issue was present and can still be found in many computers if you perform the following steps as in the video below.
Expert tip:
Some users explain their unfortunate experience:
If, however, you still experience issues with your BSplayer on Windows 10, Windows 8, then maybe you should either wait for a new version to be released or do the following:
Install BSplayer for Windows 10, Windows 8 using the compatibility mode.
Find the the box that says “Run this program in compatibility mode for:”
Choose either Windows 7 or Windows XP SP3
Apply and Ok
Run the program, install and check if it there are still issues with Windows Store opening
How to fix Bsplayer issues in Windows 10
Also, there is another annoying Bsplayer issue that has been affecting thousands of users, namely the infamous “Bsplayer exe an error occurred in the application” problem. In order to help you get rid of it, we have come up with an extensive and very easy to read guide.
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Setting Up Remote Desktop In Windows 8
Many of us are familiar with the functions of remote controls. They make watching television so much easier. Instead of getting up from your lazy boy couches, you can easily turn on the TV, change channels, and modify couches with just a tap of a button. That is why they made such a buzz when they first came out in the 1950s.
However, your TV is the not only thing that can be controlled remotely. Your computer can be controlled remotely too. Remote Desktop Connection is a feature in Windows operating system that allows you to control your computer from a different or isolated location. For example, you can control your computer at home while at work by using Remote Desktop Connection. In this guide, you will learn how to set up Remote Desktop Connection.
Enabling Remote AccessMove the cursor to the left pane and select “Remote Settings.” Go under the “Remote Desktop” section and select “Allow Remote Connections to This Computer.”
By default, Windows restriction remote connection only to other computers with network level authentication. While this option is more secured, it limits who can remotely access your computer.
Allowing Remote Desktop through Firewall: Accessing a Computer RemotelyWhile Remote Desktop Connection is indeed a useful feature, its functions are limited. For example, Remote Desktop is restricted to your local network. What is more, you cannot use Remote Desktop to connect to professional or higher versions of Windows. To get around this issue, you can remotely access a computer through a virtual private network (VPN). Programs such as LogMeIn, GotoMyPC, and TeamViewer also allow you to do this.
Do you find any use for the Remote Desktop feature in Windows? Or do you prefer a third party software like TeamViewer to do the job?
Juderson Jean-Baptiste
Juderson Jean-Baptiste has been a fervid writer since 2009. He works has appeared in the Houston Chronicle LiveStrong, and Arizona Local News. Juderson is also the founder and coordinating editor of LibreHealth — a health blog that accentuates on providing quality wellness guides. When Juderson is bored, he is either scouring the Web for the latest tech gadgets or delving into intriguing health topics.
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Top 60 Hadoop Interview Questions And Answers (2023)
Here are Hadoop MapReduce interview questions and answers for fresher as well experienced candidates to get their dream job.
Hadoop MapReduce Interview Questions 1) What is Hadoop Map Reduce?For processing large data sets in parallel across a Hadoop cluster, Hadoop MapReduce framework is used. Data analysis uses a two-step map and reduce process.
2) How Hadoop MapReduce works?In MapReduce, during the map phase, it counts the words in each document, while in the reduce phase it aggregates the data as per the document spanning the entire collection. During the map phase, the input data is divided into splits for analysis by map tasks running in parallel across Hadoop framework.
👉 Free PDF Download: Hadoop & MapReduce Interview Questions & Answers
3) Explain what is shuffling in MapReduce?The process by which the system performs the sort and transfers the map outputs to the reducer as inputs is known as the shuffle
4) Explain what is distributed Cache in MapReduce Framework?Distributed Cache is an important feature provided by the MapReduce framework. When you want to share some files across all nodes in Hadoop Cluster, Distributed Cache is used. The files could be an executable jar files or simple properties file.
5) Explain what is NameNode in Hadoop?NameNode in Hadoop is the node, where Hadoop stores all the file location information in HDFS (Hadoop Distributed File System). In other words, NameNode is the centerpiece of an HDFS file system. It keeps the record of all the files in the file system and tracks the file data across the cluster or multiple machines
6) Explain what is JobTracker in Hadoop? What are the actions followed by Hadoop?
In Hadoop for submitting and tracking MapReduce jobs, JobTracker is used. Job tracker run on its own JVM process
Job Tracker performs following actions in Hadoop
Client application submit jobs to the job tracker
JobTracker communicates to the Name mode to determine data location
Near the data or with available slots JobTracker locates TaskTracker nodes
On chosen TaskTracker Nodes, it submits the work
When a task fails, Job tracker notifies and decides what to do then.
The TaskTracker nodes are monitored by JobTracker
7) Explain what is heartbeat in HDFS?Heartbeat is referred to a signal used between a data node and Name node, and between task tracker and job tracker, if the Name node or job tracker does not respond to the signal, then it is considered there is some issues with data node or task tracker
8) Explain what combiners are and when you should use a combiner in a MapReduce Job?To increase the efficiency of MapReduce Program, Combiners are used. The amount of data can be reduced with the help of combiner’s that need to be transferred across to the reducers. If the operation performed is commutative and associative you can use your reducer code as a combiner. The execution of combiner is not guaranteed in Hadoop
9) What happens when a data node fails?When a data node fails
Jobtracker and namenode detect the failure
On the failed node all tasks are re-scheduled
Namenode replicates the user’s data to another node
10) Explain what is Speculative Execution?In Hadoop during Speculative Execution, a certain number of duplicate tasks are launched. On a different slave node, multiple copies of the same map or reduce task can be executed using Speculative Execution. In simple words, if a particular drive is taking a long time to complete a task, Hadoop will create a duplicate task on another disk. A disk that finishes the task first is retained and disks that do not finish first are killed.
11) Explain what are the basic parameters of a Mapper?The basic parameters of a Mapper are
LongWritable and Text
Text and IntWritable
12) Explain what is the function of MapReduce partitioner?The function of MapReduce partitioner is to make sure that all the value of a single key goes to the same reducer, eventually which helps even distribution of the map output over the reducers
13) Explain what is a difference between an Input Split and HDFS Block?The logical division of data is known as Split while a physical division of data is known as HDFS Block
14) Explain what happens in text format?In text input format, each line in the text file is a record. Value is the content of the line while Key is the byte offset of the line. For instance, Key: longWritable, Value: text
15) Mention what are the main configuration parameters that user need to specify to run MapReduce Job?The user of the MapReduce framework needs to specify
Job’s input locations in the distributed file system
Job’s output location in the distributed file system
Input format
Output format
Class containing the map function
Class containing the reduce function
JAR file containing the mapper, reducer and driver classes
16) Explain what is WebDAV in Hadoop?To support editing and updating files WebDAV is a set of extensions to HTTP. On most operating system WebDAV shares can be mounted as filesystems, so it is possible to access HDFS as a standard filesystem by exposing HDFS over WebDAV.
17) Explain what is Sqoop in Hadoop?To transfer the data between Relational database management (RDBMS) and Hadoop HDFS a tool is used known as Sqoop. Using Sqoop data can be transferred from RDMS like MySQL or Oracle into HDFS as well as exporting data from HDFS file to RDBMS
18) Explain how JobTracker schedules a task?The task tracker sends out heartbeat messages to Jobtracker usually every few minutes to make sure that JobTracker is active and functioning. The message also informs JobTracker about the number of available slots, so the JobTracker can stay up to date with wherein the cluster work can be delegated
19) Explain what is Sequencefileinputformat?Sequencefileinputformat is used for reading files in sequence. It is a specific compressed binary file format which is optimized for passing data between the output of one MapReduce job to the input of some other MapReduce job.
20) Explain what does the conf.setMapper Class do?Conf.setMapperclass sets the mapper class and all the stuff related to map job such as reading data and generating a key-value pair out of the mapper
21) Explain what is Hadoop?It is an open-source software framework for storing data and running applications on clusters of commodity hardware. It provides enormous processing power and massive storage for any type of data.
22) Mention what is the difference between an RDBMS and Hadoop?RDBMS Hadoop
RDBMS is a relational database management system Hadoop is a node based flat structure
It used for OLTP processing whereas Hadoop It is currently used for analytical and for BIG DATA processing
In RDBMS, the database cluster uses the same data files stored in a shared storage In Hadoop, the storage data can be stored independently in each processing node.
You need to preprocess data before storing it you don’t need to preprocess data before storing it
23) Mention Hadoop core components?Hadoop core components include,
HDFS
MapReduce
24) What is NameNode in Hadoop?NameNode in Hadoop is where Hadoop stores all the file location information in HDFS. It is the master node on which job tracker runs and consists of metadata.
25) Mention what are the data components used by Hadoop?Data components used by Hadoop are
26) Mention what is the data storage component used by Hadoop?The data storage component used by Hadoop is HBase.
27) Mention what are the most common input formats defined in Hadoop?The most common input formats defined in Hadoop are;
TextInputFormat
KeyValueInputFormat
SequenceFileInputFormat
28) In Hadoop what is InputSplit?It splits input files into chunks and assigns each split to a mapper for processing.
29) For a Hadoop job, how will you write a custom partitioner?You write a custom partitioner for a Hadoop job, you follow the following path
Create a new class that extends Partitioner Class
Override method getPartition
In the wrapper that runs the MapReduce
Add the custom partitioner to the job by using method set Partitioner Class or – add the custom partitioner to the job as a config file
30) For a job in Hadoop, is it possible to change the number of mappers to be created?No, it is not possible to change the number of mappers to be created. The number of mappers is determined by the number of input splits.
31) Explain what is a sequence file in Hadoop?To store binary key/value pairs, sequence file is used. Unlike regular compressed file, sequence file support splitting even when the data inside the file is compressed.
32) When Namenode is down what happens to job tracker?Namenode is the single point of failure in HDFS so when Namenode is down your cluster will set off.
33) Explain how indexing in HDFS is done?Hadoop has a unique way of indexing. Once the data is stored as per the block size, the HDFS will keep on storing the last part of the data which say where the next part of the data will be.
34) Explain is it possible to search for files using wildcards?Yes, it is possible to search for files using wildcards.
35) List out Hadoop’s three configuration files?The three configuration files are
core-site.xml
mapred-site.xml
hdfs-site.xml
36) Explain how can you check whether Namenode is working beside using the jps command?Besides using the jps command, to check whether Namenode are working you can also use
/etc/init.d/hadoop-0.20-namenode status.
37) Explain what is “map” and what is “reducer” in Hadoop?In Hadoop, a reducer collects the output generated by the mapper, processes it, and creates a final output of its own.
38) In Hadoop, which file controls reporting in Hadoop?In Hadoop, the hadoop-metrics.properties file controls reporting.
39) For using Hadoop list the network requirements?For using Hadoop the list of network requirements are:
Password-less SSH connection
Secure Shell (SSH) for launching server processes
40) Mention what is rack awareness?Rack awareness is the way in which the namenode determines on how to place blocks based on the rack definitions.
41) Explain what is a Task Tracker in Hadoop?A Task Tracker in Hadoop is a slave node daemon in the cluster that accepts tasks from a JobTracker. It also sends out the heartbeat messages to the JobTracker, every few minutes, to confirm that the JobTracker is still alive.
42) Mention what daemons run on a master node and slave nodes?
Daemons run on Master node is “NameNode”
Daemons run on each Slave nodes are “Task Tracker” and “Data”
43) Explain how can you debug Hadoop code?The popular methods for debugging Hadoop code are:
By using web interface provided by Hadoop framework
By using Counters
44) Explain what is storage and compute nodes?
The storage node is the machine or computer where your file system resides to store the processing data
The compute node is the computer or machine where your actual business logic will be executed.
45) Mention what is the use of Context Object?The Context Object enables the mapper to interact with the rest of the Hadoop
system. It includes configuration data for the job, as well as interfaces which allow it to emit output.
46) Mention what is the next step after Mapper or MapTask?The next step after Mapper or MapTask is that the output of the Mapper are sorted, and partitions will be created for the output.
47) Mention what is the number of default partitioner in Hadoop?In Hadoop, the default partitioner is a “Hash” Partitioner.
48) Explain what is the purpose of RecordReader in Hadoop? 49) Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?If no custom partitioner is defined in Hadoop, then a default partitioner computes a hash value for the key and assigns the partition based on the result.
50) Explain what happens when Hadoop spawned 50 tasks for a job and one of the task failed?It will restart the task again on some other TaskTracker if the task fails more than the defined limit.
51) Mention what is the best way to copy files between HDFS clusters?The best way to copy files between HDFS clusters is by using multiple nodes and the distcp command, so the workload is shared.
52) Mention what is the difference between HDFS and NAS?HDFS data blocks are distributed across local drives of all machines in a cluster while NAS data is stored on dedicated hardware.
53) Mention how Hadoop is different from other data processing tools?In Hadoop, you can increase or decrease the number of mappers without worrying about the volume of data to be processed.
54) Mention what job does the conf class do?Job conf class separate different jobs running on the same cluster. It does the job level settings such as declaring a job in a real environment.
55) Mention what is the Hadoop MapReduce APIs contract for a key and value class?For a key and value class, there are two Hadoop MapReduce APIs contract
The value must be defining the org.apache.hadoop.io.Writable interface
The key must be defining the org.apache.hadoop.io.WritableComparable interface
56) Mention what are the three modes in which Hadoop can be run?The three modes in which Hadoop can be run are
Pseudo distributed mode
Standalone (local) mode
Fully distributed mode
57) Mention what does the text input format do?The text input format will create a line object that is an hexadecimal number. The value is considered as a whole line text while the key is considered as a line object. The mapper will receive the value as ‘text’ parameter while key as ‘longwriteable’ parameter.
58) Mention how many InputSplits is made by a Hadoop Framework?Hadoop will make 5 splits
1 split for 64K files
2 split for 65mb files
2 splits for 127mb files
59) Mention what is distributed cache in Hadoop?Distributed cache in Hadoop is a facility provided by MapReduce framework. At the time of execution of the job, it is used to cache file. The Framework copies the necessary files to the slave node before the execution of any task at that node.
60) Explain how does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?Classpath will consist of a list of directories containing jar files to stop or start daemons.
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