Compared to other languages, C# was way behind in capabilities to handle data efficiently. Well, those days are over now. Microsoft just improved the C# syntax, making it easier for developers to manage data in arrays. Manipulating Arrays Have you ever had to manipulate a large set of data in multiple arrays? Of course you have! And I guess your experience wasn't that good. Compared to other languages, C# was way behind in capabilities to handle data efficiently. Well, those days are over now. Microsoft just improved the C# syntax, making it easier for developers to manage data in arrays. The new guys Two new operators have been introduced in C# 8.0 to give you all the power you need: The operator: , which specifies that an index is relative to the end of the sequence; and 'index from the end' ^ The operator: , which specifies the start and end of a range. 'range' .. Important notes The index is the same as . ^0 sequence[sequence.Length] Be careful, throw an , just as does. sequence[^0] does IndexOutOfRangeException sequence[sequence.Length] For any number , the index is the same as . n ^n sequence.Length - n For ranges, the start of the range is , but the end of the range is . inclusive exclusive The range represents the entire sequence, just as or . [0..0^] [0..sequence.Length] [..] A range doesn't need to be completely defined, e.g. -> give me everything from the start of the array to index 3. [..3] -> give me everything from index 2 until the end of the array. [2..] -> give me everything [..] Examples Confused? I promise it will all make sense after this. Let's look at a few examples. [] words = []
{ , , , , , , , , }; private string new string // index from start    index from end "The" // 0                   ^9 "quick" // 1                   ^8 "brown" // 2                   ^7 "fox" // 3                   ^6 "jumped" // 4                   ^5 "over" // 5                   ^4 "the" // 6                   ^3 "lazy" // 7                   ^2 "dog" // 8                   ^1 As you can see here is equal to , which is out of range words[^0] words[9] Give me some more Alright, alright. Here are some more ways to use it. allWords = words[..]; firstPhrase = words[. ]; lastPhrase = words[ .]; lazyDog = words[^ .^ ]; var // contains "The" through "dog". var .4 // contains "The" through "fox". var 6. // contains "the, "lazy" and "dog". var 2. 0 // contains "lazy" and "dog". and are also .NET types, which means you can create variables of those types, name them for code clarity, and reuse them over and over. Index Range Index the = ^ ;
words[the];

Range phrase = ;
words[phrase]; 3 1. .4 Conclusion This is super powerful, I can't wait to use it in my projects. This will help so much with reducing noise when using index calculations as well as making the code more maintainable. Thank you Microsoft for this great addition to the language ❤️. References https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8 Previously published at https://blog.miguelbernard.com/c-8-0-indices-and-ranges/

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In a market which experiences a tough competition, a speedy app can make every difference. A slowly built app can crash anytime. So, make sure to avoid slow app development process before your efforts go in vain. Mobile app development is well-known, especially for its slow-moving speed. Business owners are continuously trying to fulfill the deadlines and present their applications in front of the competitors in the market before the rivals come up with any new idea. In this race of quality and speed, sometimes quality is ignored and as a result of the fact, the app does not meet the expectations and requirements of your audience. Nowadays, we don’t have to explain which, how or why mobile apps are in demand. Every mobile app development firm knows how popular the app building service is. However, will they tell you how you can avoid the slow app development process by saving your pocket? Let us put light on some less-discussed facts of mobile app development. Since the speed of mobile app development is a serious problem, we have come with some useful tips to help you develop mobile apps quickly, without negotiating quality. Why Should You Avoid Slow App Development Process and Accelerate It With Better Methodologies? These days, you can see many developing ventures and apps. Following a slow procedure will not let you apply your idea on the proper time. Otherwise often, the advantages decrease with time. And this is a big issue! Since the mobile app helps you digitalize your product and always plays an important role in your business achievement, you need to make a proficient app to secure all users. And definitely, you want to manage this. In this post, you will read 6 great methods to accelerate your mobile app development process so you can avoid the slow processes, without compromising the code’s quality or your app’s performance. How to Avoid Slow Mobile App Development Procedure with the Help of an App Development Firm 1. Ask Relevant Questions If you have planned for developing an app, you should ask some relevant questions to the app development company. This will offer you more informed solutions. Before starting anything essential, you are always recommended to get correct answers to your queries. Some questions that you should ask before starting with the app development company include: Do you develop iOS, Android or both? What is the object of your mobile application? What are the special features that will make your app different and unique on the market? Is your app going to give offline mode assistance? So, these are some relevant questions which will help you recognize the efforts, money, and the amount of time to be engaged in the app development process. 2. Make Use of Low-fidelity Wireframes Want to develop an app with appropriate interfaces? Then use low-fidelity wireframes for building an app. Using this prototyping, you will find all the hidden problems of your basic design without putting much time and effort. Using low-fidelity wireframes makes it quicker and easier for a designer to go over new design concepts. In fact, a design can just provide you with rough sketches which take only a few minutes to be ready. And the rough sketches can be understood easily and put to work with no effort amid the initial stage. Concentrating on the pixel perfect sketches from the scratch will give you pain only. At the time of the early phases of mobile app development, the settlements will move the concepts faster into deploying, visualized prototypes, and gathering users’ feedback. With the use of low-fidelity prototyping, these stages will become seamless to you. 3. Have Knowledge of the Necessity of MVP You are not recommended to head to the market with a completely developed product running directly into the app stores. First, start with an MVP in your mind. MVP is an important part in app development cycle. You must introduce some essential features of your application at first. Gather all data and client feedback with care. And send this feedback to your app development team so they adjust or make important changes to the application. Maintain this cycle for a few weeks at the time of the entire app development procedure. Sometimes, this may take a few months also. After collecting people’s feedback, update your developers so they can do necessitous changes to the app. Although this procedure seems time-consuming, this is going to help you build a superb app. There is a possibility that some people don’t like some features of your app or the features don’t meet their needs. In this case, you will need to invest more time and money beyond your expectation. 4. Outsource the Tasks Which You Can’t Perform You like to go with your in-house development team but your team is not that much efficient or knows about every technology. Not just a team but any person can’t master in every technology. In that case, if any task comes to you at the time of app development, you should better go for outsourcing it to somebody who is an expert in it. Moreover, you are recommended to deal with the prime aspects as your audience is interested in that particular thing. So, outsource the side tasks and manage the basic context. This saves time and effort and helps you make an efficient app that is engaging for your users. Furthermore, you can add pre-made applets to your basic product as it doesn’t need any coding. Instead, you can do it with the use of feedback tools, new features tours, special offer notifications, sharing tools, and so forth. 5. Opt for Hybrid Mobile App Development Procedure Hybrid app development is an amazing choice if you want to crack the market building an easy app. It helps you develop both iOS and Android application quicker. It doesn’t take much time in app building. You can just write code for the basic app and introduce it on different platforms. However, it has some limitations too. On the other hand, native app development is also a good choice in case you are building a large app with different unique features. It takes pretty more time. You must write different source codes to launch your app on different platforms. You don’t need to revise the app more and more and there is less possibility of finding any bug. The aforementioned discussion compares native and hybrid mobile app development processes in brief. Nowadays, every mobile app development firm follows both the methods; however, it depends on the client needs for sure. In case you don’t wish to invest more money amid the initial phases or don’t want to spend much time and crack the app market as soon as possible, you are recommended to go for the hybrid app development process. 6. Start Automated Testing The prime reason to embrace automation approach is to save huge effort and time. This is why people depend on automation as it saves so much time which we need for completing other jobs which require more effort and attention. Different testing methods are involved in automated testing. These methods are used at the same time for saving time during and after the app development process. Time is the key factor in this fast-paced competitive market. If you don’t invest enough time in building your app and make it live before examining all aspects, it can bring a huge problem for you. Although some people have ideas regarding algorithms and code, they still don’t experience a successful app development. For this reason, give importance to testing. If you set up the automated testing, it will concentrate on all aspects of your app, increasing your self-esteem more regarding your bug-free app. The Final Say If you want everything properly organized, don’t rush for it. Keep patience and experience progress. Know the right time to crack the market with your superb application. To encounter a long-term success in the app development industry, pick up the right strategies which make a powerful base for your app to grow. Follow the aforementioned tips and you are ready to experience a long-term app development success.

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No one likes slow websites - users, developers, bots, even Google rank algorithm. When you start developing a new web application everything is running smooth and fast. Usually, web performance is not being checked before going live for the very first time. At this point, fixing performance issues requires reviewing the whole web application and third-party scripts that were added during the development period. "Let's Fix It" Approach So, the new website is live, the issues are fixed or in the process of fixing. After some time and a few or more release cycles, one day your SEO engineer tells you about the low position in Google search results. One of the most possible reasons for that is low-performance score in Google PageSpeed Insights. Therefore, you need to go back to review and fix the problem again :-( Choosing Suitable Performance Metrics There is no single service or tool to measure web performance but mostly, they are SEO-focused on optimization for Google Search Engine. It would be smart to use the same sets of metrics for that - Google Lighthouse Tool that generates PageSpeed Insights reports. The most important indicator is Performance Score which summarizes the page performance. This score is determined by running Lighthouse to collect and analyze lab data about the page. A score of 90 or above is considered fast, 50 to 90 is considered moderate, and below 50 is slow. Getting Performance Score It is pretty easy to get the current Performance Score for a web page. You can use Chrome Browser with Audit Tab in Dev Tools. Another option is using PageSpeed Insights for it. It is good enough for using "Let's fix it" approach, but it has some disadvantages: Manual score monitoring that is time-consuming to run for every change No possibility to get scores from different world's regions Monitoring PageSpeed Performance Score All you need is using a service that can monitor the Performance Score for different regions and use Lighthouse for it. Is that enough for PDD? The short answer is No. Ideally, web performance monitoring should be part of the development process, the same as Unit Testing or End 2 End Testing. In that case, it is possible to track all changes and prevent decreasing web performance. Thus, starting a new web application using PageSpeed Driven Development approach helps to be on the green side of the Web Performance Score from the start and keeps the project in the same position during the whole development process. Using PageSpeed Green This lets you monitor current performance indicators continuously by integrating with CI/CD (using ). That allows you to notice in time all web performance degradation during development process. Web Performance Monitoring Tool PageSpeed Green CLI Summary With everything mentioned above, you won't let your website performance hold you back. Make smart performance-related decisions about it, use a good monitoring tool to improve your audience satisfaction and sales. Your site loading time and quality can actually be an asset rather than an obstacle. (Originally published ) here

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In 2020, apart from falling cryptocurrency prices following the stock price due to being dragged by the coronavirus, we see some news in the blockchain industry that is quite encouraging for us in terms of innovation and economic growth potential. Aside from many Proof of concepts created by many parties (including government) around the world since 2017, Australia and India launched the blockchain technology roadmap, where Australia stated in its roadmap that the blockchain could generate a business value of more than US $ 175 billion in 2025 and more than US $ 3 trillion in 2030. Recently in early March 2020 the US Senate also held a hearing with blockchain practitioners with the title " " in which members of the senate deepened their understanding of the benefits of the blockchain so that they could draw up a budget more beneficial for citizens. Building Blocks of Change: The Benefits of Blockchain Technology for Small Businesses Meanwhile, South Africa, has planned to form a national blockchain alliance in April 2020 to reduce unemployment and also provide tax discounts for companies involved in R&D. Actually, what is blockchain innovation? Why so many people and nations talked about blockchain ? What kind of innovation blockchain is actually ? Lets learn about the type of innovations from the book "Prosperity Paradox" written by Dr.Clay Christensen (author of the classic book “innovator dillema”) through this book he explains why many investments in growing the economy apparently fail to support sustainable prosperity and he offers solutions to create sustainable change. In this book, Dr. Clay divides innovation into several types: 1st type of innovation : Efficiency innovations Efficiency innovations are types of innovations that help companies make products cheaper. This innovation is important for the economy because it maximizes free cash flow. But this efficiency innovation does not produce growth - it even eliminates growth. Because you are trying to make things more efficient so the effect is maximizing free cash flow but minimizing growth and job creation. "Efficiency innovations don't create growth. They eliminate growth. Source : Prosperity Paradox 2nd type of innovation : Sustaining Innovation The second type of innovation is "sustaining innovation". In this type of innovation you try to make a better product. Almost all types of innovations that we see around us are types of sustaining innovation. This type of innovation also does not provide much growth for the corporation and also the economy. For example, if I work for Toyota, if I try to sell you a Prius, of course you won't buy a Camry. So sustaining innovation helps you make better products but does not create growth. “Sustaining innovations allow us to make good products better, but they don’t create any new growth.” 3rd type of innovation : Market-Creating Innovation The third type of innovation is "Market-creating innovation" which creates net growth for corporations and countries. This type of innovation transforms products that are historically complicated, expensive and can only be accessed by the rich or limited and turns it into an affordable and accessible product so that more people can own and use it. In other languages, market creating innovation democratizes products or services that were previously exclusive. Innovation with the type of market creating becomes the foundation for a prosperous country and corporation and in the process lifts millions of people out of poverty. Market-creating innovation will produce economic growth because they must build infrastructure to serve the new market and in the process provide various types of jobs to the community. Market-creating innovation will also usually fund its own innovations going forward. This type of innovation not only creates markets, but jobs, too. This is because as new markets with new consumers are born, companies must hire more people to make, market, distribute, sell, and service the product Then,  which type of innovation blockchain is ? Probably the answer will vary, or maybe blockchain can cover more than one type of innovations, some say that blockchain eliminates middleman, even though, middleman or central authority, in blockchain is not really lost, but is changing shape, from one that is central and has enormous authority, to many parties (called miners, or block producers) but have more limited authority when compared to the middleman in the non-blockchain era, as well as a far more democratic decision making process. Indeed, due to technological innovation, there will definitely be some types of jobs lost, with smart contracts, there is no need for a manual reconciliation process but because of the nature of technological innovation can unlock new markets - market creating innovation - then technology companies will also open up many new jobs to serve that market. Value of the blockchain Before 2005 we could not imagine that with the internet, now we can continue to keep in touch with our school friends from elementary school era. Blockchain will transform record keeping (database) just as the internet transforms the way we communicate. Blockchain is expected to have an impact on the financial industry, such as what the internet does to the media industry. This specific value is directed to Defi / Decentralized Finance. In short, blockchain technology values are record keeping, smart contracts and value transfer. What kind of new market that blockchain unlocked? Why is blockchain technology can be categorized as market-creating innovations? What kind of market does the blockchain create ? The answer can be very long and takes a long time to explain, but here I try to discuss just a few. Investment (from the perspective of investors) or capital fundraising (from the perspective of a businessman) Before there was a blockchain, someone with only 500,000 funds could not participate in high-quality investment in "the next big thing" technology companies such as Gojek, Tokopedia (Indonesia), Facebook. Yes, you can, but wait for them to IPO aka very high valuation. On the other side, SMEs or startups often find it difficult to access loans from banks because they do not have collateral, accessing capital from Venture Capital is also difficult, especially if SMEs whose valuations do not normally go up to 10x. With the blockchain, which revolutionized the recording of share ownership through the concept of tokenized cap tables, investors with small capital can now engage in quality investments and together with many other investors (tens of thousands, no specific restrictions) invest in one company. But when it comes to regulation, there is a limit on the maximum number of shareholders. In this case the blockchain can "level the playing field" in the world of investment and reduce the income gap, starting from the same opportunity to invest. Fractional ownership Property using blockchain Property investment, like investing in startup companies, is also an industry that can only be accessed by the upper middle class only. But with blockchain technology that can revolutionize property ownership records, small investors with hundreds of thousands of funds can participate in investment and property speculation, this concept is called "fractional ownership" in the property world. Meanwhile, in terms of property developers, this concept will drastically increase their financial liquidity because it opens many new markets that previously could not have property. Decentralized finance can democratize the financial world Before there was the internet, the media was dominated by television and newspapers with big capital, but with the internet, everyone began to share information and could become their own media, even Youtube began to overtake the share of television. Decentralized finance built on the blockchain allows anyone to create financial products for the global community, which is currently dominated by only a few big players. Other potential blockchain Blockchain has many other potentials that are not limited to the point I mentioned above. For example, reducing the dependence of SMEs on the giant platforms that dominate the internet today, blockchain can revolutionize capitalism, upgrade the sharing economy that is currently not pro-service providers - because with blockchain, transactions occur peer to peer. What about Indonesia? Many countries have recognized the character of blockchain which has potential as a market-creating innovation and regulators of these countries are studying the benefits and impacts on the economy so that in the future they can arrange their budgets properly, so that regulations can keep pace with the development of the use case of the blockchain. Indonesia, 4th most populous country in the world, is also more or less the same. Although it has not yet reached the hearing stage with congress. which is the only blockchain platform company from Indonesia, where developers can build a decentralized application to transform the economy, create economic growth and help Indonesia to prosper. Vexanium.com ( : ) Disclaimer The writer of this article is the director of education in Vexanium foundation Let the blockchain force be with you. Picture source : Freepik

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Last week’s markets were a whirlwind making history for not one, but two crashes now called and On each of these days, market-wide curbs, also called trading circuit breakers, kicked in to prevent panic selling and rapid market decline when the markets dropped more than 7% after the opening bell. Black Monday (2020) Black Thursday (2020). You can read more about these market-wide circuit breakers from NYSE here . Whether the coronavirus is a or , we at PEAK6 hope you and yours are staying healthy and positive during this crisis. We also hope you can join us in acting now to . As each of us are impacted by quarantines, school shutdowns, work from home, and other social distancing, remember that our adaptability is part of our genius. Be who you ought to be and have compassion for those who are in tough spots both now and in the coming weeks. A Quick Note: black swan gray rhino flatten the curve Seeing as these events happen so infrequently, I thought I’d capture some detail around how our systems at PEAK6 experienced them. I won’t go into system volume or resiliency again as I talked about those in . Indebted to the Tech However, the graphs below show how our feed systems recorded these events with a nice big gap during the 15-minute breaks. Flag on the Play, False Start... When a market-wide circuit breaker is triggered, there’s a bit of a scramble. Similar to a false start in football with some confusion and players going back to starting positions, market participants quickly run through their order books acknowledging cancels, busts, and any other system anomalies before the markets reopen after the 15-minute pause. Unlike football, however, when the markets come back, there is actually a bit of hesitancy that’s different from a normal open. Not only do we see wide markets with large spreads on most names, but there’s almost a trickle-in effect until market activity picks back up. You can see this in our market viewing tools below. This first view shows what we’d normally expect as markets are moving and bid/asks change. However, this next view shows the market stagger with trades coming in after the circuit breaker. Both of the days we saw market curbs, we also saw markets stabilize after the break without further drops or need to trigger additional curbs later in the day. Meaning they did their job. Cool! Breaking the Cycle The circuit breaker pattern is widely used in software, just as in exchanges, to reduce harm and allow systems to stabilize. Michael Nygard’s popularized the approach back in 2007. Quick aside, Nygard also has a great talk on real-world software architecture called which you should definitely check out. Release It! Architecture without an End State , What’s neat about circuit breakers is they acknowledge that there are times when further interaction with a failing system only increases the chance of overall system failure. In this way, circuit breakers insulate a system while also allowing the system’s users a chance to fail-fast or accommodate for the failure. As a quick example, consider a simple 3-tier architecture with a UI routing traffic to three instances of a backend service. If service A3 starts experiencing issues at the data layer, it could use a circuit breaker and open the circuit, disabling the connection from the UI. This lets the UI know that the service is unhealthy while also removing stress from DB A3. If DB A3 stabilizes, then service A3 can either half-open (partially allow use while checking for errors) or close the circuit to re-enable operation. For a full rundown on the pattern, check out Martin Fowler’s write up . here Breaking Some Code There are many implementations of the circuit breaker pattern across languages, libraries, and frameworks. Netflix’s library codified a Java version of the approach back in 2012 and libraries like and are also great examples. In the code below from the goresilience library, a function called will be called wrapped within a circuit breaker. As this is code, the circuit will fluctuate from open to closed based on the provided config as e succeeds or fails every other minute. Hystrix resilience4j goresilience errorOnOddMinute example rrorOnOddMinute {
 minute := time.Now().Minute() minute% != { fmt.Errorf( , minute)
 } } {
 runner := circuitbreaker.New(circuitbreaker.Config{ }) {
    time.Sleep( * time.Millisecond)    err := runner.Run(context.TODO(), errorOnOddMinute) err != { err == errors.ErrCircuitOpen {
        fmt.Println( )
      } {
        fmt.Printf( , err)
      }
    } {
      fmt.Printf( )
    }
  }
} func errorOnOddMinute (ctx context.Context) error if 2 0 return "error because %d minute is odd" return nil func main () //ErrorPercentThresholdToOpen:        50, //MinimumRequestToOpen:               20, //SuccessfulRequiredOnHalfOpen:       1, //WaitDurationInOpenState:            5 * time.Second, //MetricsSlidingWindowBucketQuantity: 10, //MetricsBucketDuration:              1 * time.Second, for 75 if nil if "[!] circuit open" else "[-] execution error: %s\n" else "[+] good\n" Breaking Your Own Circuits One last thought on circuit breaking hits a little closer to home. The social distancing many of us are following through on because of the coronavirus is also a kind of circuit breaker. Instead of DB A3, we’re thinking about how our local hospitals and at-risk communities might be insulated from an overwhelming amount of new cases. We open the circuit between healthy, susceptible individuals and newly infected individuals without symptoms by distancing ourselves. If done effectively, it will relieve stress on our entire hospital system so it remains stable and can endure the load. I hope this sheds some light on circuit breaking as a pattern, how it shows up in the wild, and how you might use it in your own systems. If you’re interested in patterns like this and writing resilient code, check out our . We’re always looking for passionate, curious engineers who like working on hard problems! open positions

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Tiered Locality is a feature led by my colleague Andrew Audibert at Alluxio. This article dives into the details of how tiered locality helps provide optimized performance and lower costs. 1. Data Locality and Tiered Locality corresponds to the effort required for an application to read the data it needs. The closer or more localized the data is, the faster the application can retrieve it. As a configuration optimization, it provides significant value in big data workloads on distributed systems and enables higher performance without needing to scale more resources. In most cases, data locality is about colocating the data and application on the same node. However, in the cloud, where there are multiple networking layers, there are more tiers of locality. Data locality Tiered locality allows a user to configure data placement policies to accommodate the cluster's network topology in order to achieve performance and cost optimizations. 2. Tiered Locality in Alluxio OSS Tiered locality uses awareness of network topology and configurable policies to manage data placement for performance and cost optimizations. This feature is particularly useful with cloud deployments across multiple availability zones. It can also be useful for cost savings in environments where cross-zone or cross-location traffic is more expensive than intra-zone data traffic. Here is a simple scenario where Alluxio can use network topology information to bias towards more local reads and writes with Alluxio workers in two different AWS Availability Zones. Using this setup with EC2 instances, the application demonstrates different read performance depending on which worker the data is read from. m5.xlarge Unsurprisingly, performance is fastest when reading from the local Alluxio worker and slows when read from a non-local worker. The performance difference between worker 2 and worker 3 is due to the difference in bandwidth between Availability Zones (AZs). Worker 2 is in the same AZ as the application with about 10 gigabits per second of bandwidth. Reading from worker 3 is slower because the bandwidth across AZs is only about 5 gigabits per second. Without tiered locality, the application is just as likely to read from either worker 2 or 3. Configuring tiered locality gives a preference for worker 2 for faster performance. The situation is similar for writing data. When applications write data through Alluxio, there is a preference for more-local workers. 3. Configuration To enable tiered locality and the associated performance benefit, every actor (clients and workers) must be configured to know its . Tiered identity is a mapping from locality tier (e.g. Availability Zone) to the value for that tier (e.g. us-east-1a). For the above cluster setup example, the tiered identities would be: tiered identity Configure with alluxio-site.properties The most straight forward way to configure tiered locality is to use Please refer to this : alluxio-site.properties configuration setting page Properties for Application, Worker 1, and Worker 2 alluxio-site.properties alluxio.locality.az= alluxio.locality.order= # custom locality hierarchy "us-east-1a" "node,az" Properties for Worker 3 and Worker 4 alluxio-site.properties alluxio.locality.az= alluxio.locality.order= # custom locality hierarchy "us-east-1b" "node,az" We set to introduce the locality tier and show its order in the locality hierarchy. By default the locality tiers are . Note that we don't need to explicitly configure identity because it is determined automatically via localhost lookup. alluxio.locality.order az node,rack node Configure with alluxio-locality.sh When the cluster is set up automatically or there are many workers, it can be convenient to set the locality information via script instead of using a static value in . If a script exists at , it will be executed to determine tiered identity. alluxio-site.properties ${ALLUXIO_HOME}/conf/alluxio-locality.sh alluxio-locality.sh #!/bin/bash
echo "az=$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone)" The same script can be set on every node to look up and report the availability zone. The script name can be configured by setting the property key. alluxio.locality.script 4. Custom Tiers The example shown here uses the tiers and , but the tier configuration is fully customizable. Readers can use whatever tiers make sense for their deployment, e.g. , , , etc. as long as each region is contained within the next in , since locality decisions prefer to match in the earliest tier possible. node az rack zone region alluxio.locality.order For more information and docs on Alluxio Tiered Locality, Alluxio community users can get more information . It is also worth mentioning that Alluxio Enterprise Edition adds an additional feature: strict locality tiers. Users can define a tier to be “strict” meaning that no traffic is allowed between actors that don’t match in the tier. For more information on Cluster Partitioning with Strict Locality, Alluxio Enterprise Edition users can refer to the . here docs here 5. Conclusion In big data workloads on distributed systems, data locality helps engineers to get around the limitations due to network traffic. In the cloud, when clusters have non-uniform networking capabilities, tiered locality adds significant value in improving performance as well as saving costs. With its ability to intelligently aggregate and manage data in different environments, tiered locality is one of many capabilities that Alluxio can perform as a virtual data layer. For more information and discussion, I encourage users to dive deeper into . Alluxio open source community This article was previously published on Alluxio’s engineering blog and Dzone .

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Nominated for 2022 - HackerNoon Contributor of the Year - Machine Learning

Data Location Awareness: The Benefits of Implementing Tiered Locality

Does your content generate more yawns than leads? Is your content just another copy of 100 similar articles clogging up the search engines? Hopefully not, but even if you think your content has an impact, there is always room for improvement. Are sales or web traffic down? Boring content could be to blame Nobody reads boring content. Data collected by Chartbeat shows that most readers only scroll halfway through stories on Slate.com. . The takeaway? If your content doesn’t grab a reader’s attention by the fourth paragraph, it’s boring. Boring content repels readers and deters sales. The good news is you can revive bored readers by launching a highly targeted content marketing strategy. That’s about four paragraphs Content marketing isn’t supposed to be snooze-worthy Your content should inform, entertain, or inspire readers to take an action. If you’re pumping out generic content on a frantic schedule just to meet arbitrary deadlines, your readers are probably bouncing fast. A targeted content marketing strategy will slay your bounce rate and start generating leads and sales. All you need to do is create irresistible, interesting content. If you’re new to content marketing you might be wondering how to come up with interesting topics and align your content with your brand. We published a that answers these (and other) pressing questions. content marketing guide In a nutshell, you need to figure out what’s not being addressed in your industry and write about those issues in a way that adds value to your readers’ lives. For instance, say you’re a plumber. Some of your readers might be homeowners who don’t know using commercial drain cleaner can destroy their pipes. Write an article explaining why drain cleaners are bad for pipes, translate the damage into dollars, and explain how to prevent clogs in the first place. Add a twist to standard topics General topics are easy to come up with, but . For example, if you’re a dog trainer it’s easy to create a training guide titled Teach Your Dog to Sit. It sounds like a good piece of content, but it’s actually quite boring. Thousands of similar guides already exist. Unless yours stands out, you won’t capture much interest. to capture attention you need to get specific What would be interesting is a guide titled . Now you’re speaking to dog owners with stubborn, independent, and distracted dogs. You’re going to capture their attention with your title and if you can deliver on the content, they’ll be more likely to heed your call-to-action at the end. Train Your Dog to Stop in Their Tracks and Sit Without Saying a Word Share content you should be charging for One of the best ways to capture your readers’ attention is to share content you should be charging for. By sharing information you’d normally charge for, you’re not only giving readers a special deal, but you’re earning their trust at the same time. When a reader recognizes the value you’re giving away, that automatically makes your content more interesting. They may not be on the edge of their seat eager to know all the secrets to negotiating a 75% commission for affiliate products. However, since it’s free information they know should cost money, they’ll read it anyway. They might even sign up for your newsletter in hopes that you’ll share even more information. Create subheadings to make your content skimmable Statistics show that 81% of website visitors and don’t read until they find a heading that stands out. Make the most of your headings within each piece of content. Consider that your headings might be the only text some visitors read. scan articles for subheadings Create your subheadings knowing readers will skim your content. Try to make all subheadings informative, but also interesting. If any of your content is highly important, use attention-grabbing subheadings to ensure skimmers take note. A marketing agency can help make your content engaging If you’re struggling with traffic, leads, or sales, a professional content marketing campaign will help. While it’s possible to manage your own content marketing campaign, it’s easier to let the pros handle it. By working with a content marketing agency, you won’t need to create all of your own content. You’ll need to come up with basic ideas for the kind of content you’d like written, but the agency will handle all of the writing and distribution. Most of all, content marketing agencies know exactly how to write engaging content that people want to read. If you want engaging content that generates sales and leads, consider and working with professionals; it’s what all the top businesses are doing. performing an audit

DEV.co

How to Combat Reader Fatigue to your Content Marketing Campaigns

We’re only three months into the new decade and we’ve already had the threat of WW3, Australia being on fire, and an outbreak of a new Coronavirus. Surprisingly, it’s the latter that has forced many people to isolate themselves at home. If you’re one of the people who’s job or school has been closed because of COVID-19, you’re probably pretty bored. Thankfully, this sudden influx of free-time is a great opportunity to practice your coding skills or learn JavaScript. So, to get you through this time, here are 5 great Javascript projects to code during the quarantine. 1. A Simple Clock This is a good project to start you off if you’re still new to JavaScript or if you just need a warm-up. It’s also useful if you never seem to know what time it is and are suddenly missing a clock. As well as that, since this project is fairly straight-forward, you can have some fun with your styling. 2. Battleship Want to code? Want to play a game? Well, creating your own Battleship game, like which I built with a coding partner, will let you do As an added challenge, you can try adding difficulty levels to your computer player. the one here both. 3. Etch-a-Sketch Building a browser version of Etch-a-Sketch is a really fun way to practice working with event listeners in JavaScript. You also have the option of keeping your app simple or making it more complicated by adding different grid size options and random colour effects. 4. A Tip Calculator Figuring out how much you need to tip can be really frustrating, so why not spend some time building a calculator for that very purpose! Now you’ll know exactly how much to tip your servers you’ll get some great coding experience. and 5. Speech-Recognising Chat-Bot This is a really impressive project for your portfolio that you can complete surprisingly quickly. And you’ll get to practice working with an API. For more information, you can follow . this tutorial Hopefully building these projects will make your time in quarantine more fun while we all wait for this Coronavirus thing to blow over. Until then, remember, wash your hands, folks! Thanks for reading. If you’d like to follow my development journey, you can find me on LinkedIn and on Github .

5 Great JavaScript Projects to Code During Quarantine

In this short, but nonetheless useful article, I have summarized the most beneficial tips for writing clean code. These rules are independent of the language you use and are invaluable for both beginners and experienced programmers. Martin Golding’s famous quote is: “Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live.” Writing clean code makes the code easier to understand going forward and is essential for creating a successful maintainable product. Programmers are authors, and your target audience is not the computer; it is other programmers (and yourself). “Any fool can write code that a computer can understand. Good programmers write code that humans can understand.”- Martin Fowler. To be able to write clean code, you should train your mind over some time. The hardest part is only making a start, but as time goes by and your skillset improves, it becomes easier. Writing clean code is all about readability, so even the smallest things like changing your habits for naming variables make the most significant difference. According to the book “ : A Handbook of Agile Software Craftsmanship” written by Robert C. Martin: code is clean if it can be understood easily — by everyone on the team. With understandability comes readability, changeability, extensibility, and maintainability. Clean Code General rules for writing clean code Follow standard conventions. Simpler is always better. Reduce complexity as much as possible. Always find the root cause. Always look for the root cause of a problem. Be consistent. If you do something a certain way, do all similar things in the same way. Use explanatory variables. Prefer dedicated value objects to primitive types. Avoid logical dependency. Don’t write methods that work correctly depending on something else in the same class. Avoid negative conditionals. Names Use intention revealing names. Choosing proper names takes time but saves more than it takes. The name of a variable, function, or class should answer all the big questions. It should tell you why it exists, what it does, and how it is used. If a name requires a comment, then the name does not reveal its intent. Essential Rules for Names: Choose descriptive and unambiguous names. Make a meaningful distinction. Use pronounceable names. Use searchable names. Functions The first rule of functions is that they should be small. The second rule of functions is that they should be smaller than that. This implies that the blocks within if statements, else statements, while statements should be one line long. Probably that line should be a function call. Not only does this keep the enclosing function small, but it also adds documentary value because the function called within the block can have a nicely descriptive name. Essential Rules for Functions: Small. Do one thing. Use descriptive names. Prefer fewer arguments (no more than three of them). Have no side effects (Functions must only do what the name suggests and nothing else). Don’t use flag arguments. Split method into several independent methods that can be called from the client without the flag. Comments. Ideally, comments are not required at all. If your code needs commenting, you are doing something wrong. Our code should explain everything. Modern programming languages are English like through which we can easily justify our point. Correct naming can prevent comments. Essential Rules for Comments: Use as an explanation of intent. Use as clarification of code. Use as a warning of consequences. Always try to explain yourself in code. Don’t be redundant. Don’t use closing brace comments. Don’t comment out code. Just remove. Objects and data structures. Objects hide their data behind abstractions and expose functions that operate on that data. Data structure present their data and have no meaningful functions. Essential Rules for Objects and Data Structures: Hide internal structure. Prefer data structures. Avoid hybrids structures (half object and half data). A small number of instance variables. The base class should know nothing about their derivatives. Better to have many functions than to pass some code into a function to select a behavior. Prefer non-static methods to static methods. It may not be possible to apply all of these rules in your daily code in an instant. But as a result, it will bring great satisfaction from your work and sincere gratitude from people who will read the clean code that you wrote. The best books how to write clean code: Clean Code: A Handbook of Agile Software Craftsmanship (By Robert C. Martin); Refactoring: Improving the Design of Existing Code (By Martin Fowler); Code Complete (By Steve McConnell). Have a Happy Clean Code! Sincerely, Dmytro Pogribnyy.

Target

Helpful Tips for Writing Clean Code

After I got my Engineering diploma I have worked in several places. Those are professional factories including Croissant Production and Juice Extraction plants. I was dealing with data in all of those places. I understood that people could be much more successful with the help of software. So these incidents put me in a way to think more about handling data and finding my way in the computer world. Since I first clicked on the Microverse advertisement time passed so quickly and I learned so much. The topic of my article is about the initial experience of the program, let's move on to that point. As I completed the first module successfully, I would like to share my experiences. Covering the first 23 days of experience. Microverse is an online learning program that I believe will break the prejudice about “online things”. Why? Because it will be very successful. Community 1. Stand-Up Team We have small groups of people usually 4 to 7 people from all around the world. And Starting the day with the same group and completing the day with the same group. This gives you a feeling of belonging and explaining yourself. 2. Coding Partners As we move in the program we are meeting with new coding partners. This means meeting new working styles and learning more about how to get things done. 3. TSE's Every time we finish a project a technical support engineer reviewing our code and giving feedback. This is a great opportunity to say them hi and appreciate their efforts. 4. Everyone Else We have a great and vast community with people from over 100 different countries and the chance of saying them hello is great. Most importantly we get to know new people and having a long time friendship. We are having a chance to help others. Meetings 0. Meeting Culture As a very respectful person, I never missed my meetings and always joined meetings in the time. This is the general culture in Microverse. People are caring for 1 minute. Because it is important. 1. PtoP Code Review With our team, we are meeting every morning for half an hour to examine one of our’s code in detail and give him or her feedback about it. This gives a lot of favor for everyone. We have the chance to see different approaches to the same problem and refresh ourselves. Learning how to give and take feedback is important too. 2. Standup Meeting Every end of the day we are meeting with our team again to talk about what we have accomplished on that day and sharing our blockers. Goals for the next day is another topic for this specific meeting. 3. Weekly Mentor Checkin The weekly perspective of our mentors “checking us in”. Which means we are having small to medium dense talk with them about what is going on in the program for us. Including our overall mood, we are giving our thoughts about the flow. As our mentors are making further studies in the program we have the chance to take advantage of that too. 4. Donut Microverse giving us the chance to say hello to a random person every week. We call it the Donut app. It is so easy to become friends, share things and help. Projects Projects in microverse are the milestones of your learning process. They are the clear indications of your outcome. 1. Study/Application Balance Naturally, before every project, we are having our learning process in our path. I usually find it useful to click additional links, inline references in our main articles and never got regretful so far. Putting a little more effort on the study part is acceptable in our program. Though one shouldn’t get lost in researching and get the most important parts from it. 2. According with Coding Partner Cording and according myself with a coding partner is a bliss for me. I LOVE meeting new people and different views. So I always leave the lead to my partner to see his or her approach or how to say.. the first glimpse… With a little effort and time, two strangers have that chance to become friends. Moreover, by sharing time and responsibilities this unique experience is opening a really long way of friendship. Personally, I always would like to show them that I am a lifelong friend for the best people. 3. Getting the Project Approved In every project, we have our requirements list which is very clear. I read it every time. And after I read it do you know what am I doing? I am reading it again. Every information you need to pass your project is on that list. 4. Avoiding Common Pitfalls Once I got used to my GitHub account I started to use it more effectively by following the progress of my colleagues. This helped me a lot because I offered them help when I saw they are stuck. 5. Working Extra Microverse demands 40 hours per week but this shouldn’t be your limitation. Putting a few extra hours would help you a lot in the mainstream time to be more relaxed when reading, learning and coding. At this point, I am sure it will be very nutritive for me in the next months. I will be giving more insights about the program in the future.

Online Learning: 3 Initial Experiences at Microverse

Did you ever imagine watching a doctor performing surgery, in real-time, on your mobile phone and that too in 3D? Don’t get confused pal, this is not Tony Stark’s laboratory. This is the power of 5G! is coming soon and according to a company working on 5G infrastructure, over of us are expected to connect to 5G by . Mobile phone applications and IoT will get affected the most by 5G and are hoped to become more powerful than ever. There is no doubt that software development companies in India are going to have a field day for years to come. 5G Ericsson, 1.5 billion 2024 , a US-based technology journalism and market data research company, wrote in its article that countries like have already started rolling out 5G networks. Sdx central South Korea, the United Kingdom, Germany, and the United States Talking about the world’s leading mobile phone companies that have already started delivering and working on 5G are . Also by the end of , the launch of 5G smartphones will rule the tech world with the launch of and many more. Ericsson, Samsung, Huawei, Nokia and ZTE 2020 Samsung Galaxy S10, Samsung Galaxy A90, Huwaei MateX The interesting part about 5G is that it’s not an updated version of 4G but a whole new infrastructure supporting the paradigms of 4G. This way 5G can boost the industries by bringing another Industrial Revolution. Know the predecessors Just before we jump on the impact of 5G, let’s take a look at how and where it all started. 1G (Analog): Released in mid-1980 First-generation of wireless communication Only simple calls could be made Transferable data speed was 1.9 kbit/s 2G (GPRS): Introduced in 1991 First-ever digital cellular technology Services provided were voice calls, text-only SMS messages, and internet connection facilities Transferable data speed 10 kbit/s 3G (UMTS): Introduced in 1998 Transferable data speed was between 200 kbit/s and a maximum of 14.7 Mbit/second. Smartphones also took a leap and allowed users to send and receive images and make video calls 4G (LTE): Released in 2008 Currently in use Allows gaming, video conferencing, high-definition live media streaming The transferable data rate is 60 Mbit/s Mobile apps will go upside-down! Change is the rule of life and if it is about switching to something as great as 5G then why think twice? Talk of the town, when it comes to 5G, is about its zooming speed. , the world's largest telecommunications company’s experiments have already achieved a data transferable speed of around for 5G. This means that users will be able to enjoy a video streaming experience on almost every handset. AT &T 6Gbps 4K Coming to the effects of 5G on mobile apps, there are a few things mobile apps need to do to prepare themselves for this tech-hurricane. They can consider the following possibilities of 5G and plan accordingly: Quick as a Flash: 5G has the capability to transfer files in the blink of an eye. The speed transitions can go up to leading to lesser use of internal memories and more use of cloud memories. Sending bytes of information or even streaming real-time videos in 4k is all possible after 5G is launched. So, who can work on technologies that can support cloud storage as well as zooming speeds. 15 to 20 Gbps hire app developers Boon for the world of Reality: Do you remember the game It is just a small example of augmented reality or AR. Things will get more exciting and real after the introduction of 5G. Things like AR mirrors, virtual dressing rooms and much more will become a common thing to see around. Mobile applications will start to incorporate augmented, virtual or mixed reality more in their products attracting more and more users because who wouldn’t love an app with which we can interact visually? Hey Siri! You’ve got tough competition. Pokemon? 4k and 3D are going to be a commoner: Once we will get to achieve speeds as high as 15Gbps, 3-dimensional video streaming will be a common thing. Almost every mobile application will or will have to switch to 3D to stay in the race. Video streaming apps will be more in demand because of such a rich experience. So if you are planning to learn app development technologies try to learn video implementations in the long run. Chatbots will get revived: Coming to chatbots, the biggest issue we face for now is that they are not real-time or are heavily loaded. 5G is expected to help revive them paving the way to real-time chatbots. This is possible because of the low latency of 5G. Low latency, in simple terms, is a network that is optimized to work on a high amount of data in a lesser amount of time. 5G is coming soon with this low latency network to resolve all our problems of slow internet. There is enough for all: Increased network capacity will push out the word buffering from our dictionaries. This is because the technology used in 5G is based on multiple bands of spectrum. 5G is promising extravagantly high speed. Since we have arrived at this point, why don’t we take a look at what exactly 5G will work on? 1. Millimeter-wave: These waves are broadcasted at a varying speed starting from 30 GHz to 300 GHz. While if we talk about LTE or the 4G that we are currently using is working on the highest frequency of 6 GHz. So seeing such a great leap will be fascinating for users too. 2. Small cells: Small cells, as the name suggests, are low-powered portable base stations that can be placed all over the cities. Fun-fact is that these small cells go unnoticed because their antennas are very low profile. Another cool thing that we might see in the coming time is a small cell inside every home. 3. Massive MIMO: 5G is going to increase the number of antennas as compared to 4G in order to provide a buffer-free experience. MIMO will multiply the number of antennas on a receiver and sender so as to maximize the working efficiency of 5G. 4. Beamforming: We can compare this technology to Google Maps. Similar to Gmaps, it finds the best route for the transfer of data for every individual. So now you know why 5G is so promising about its high speed. 5. Full duplex: Another technology 5G is implementing in itself is Full duplex. This means that the whole work of sending and receiving signals will be handled by a single channel. But the only drawback we think of this tech could be signal interference. Conclusion We’ve come a long way in the world of network and wireless communications. From 1G’s analog signals to 4G’s LTE we have seen it all. Soon 5G will take over all of our mobile phones and IoT devices opening a whole new world of opportunities and fun. This will all be possible because of the incredibly high speed of 5G. From sending Gbs of information in just a click to streaming 4k videos on a screen as small as our mobile phones, 5G is coming to make all this a reality. If you own a business or are planning to own one then you must be aware that you will be needing a mobile app for the promotion and working of your business. For this, you can take the help of a that works on new technologies and is already planning to work on 5G because professionals deal with things the way they should be dealt with. mobile app development company in india

HackerNoon Tech Stories Archive March 22nd, 2020

C# 8.0 Indices and Ranges

@miguel-bernard
Miguel Bernard

Useful Tips to Avoid Slow Mobile App Development Procedure

@jamesjor
James

Building Websites and Webpages With Centred Around PageSpeed

@pagespeed-green
PageSpeed Green

Could Blockchain Innovation Be The Source of Prosperity for Nation?

@rheinmahatma
Rhein Mahatma

The Markets Are Out of Order. How To #BreakTheCycle

@dcollins_peak6
Dan

Data Location Awareness: The Benefits of Implementing Tiered Locality

@bin-fan
Bin Fan

How to Combat Reader Fatigue to your Content Marketing Campaigns

@natenead
Nate Nead

5 Great JavaScript Projects to Code During Quarantine

@evaveskova
Eva Veskova Jackson

Helpful Tips for Writing Clean Code

@dmytro-pogribnyy
Dmytro Pogribnyy

Online Learning: 3 Initial Experiences at Microverse

@Kubilay
Kubilay Caglayan

5G is Here: How The Dynamics of Mobile Apps Will Change

@theronald248
Jasmine Ronald

HackerNoon Tech Stories Archive March 22nd, 2020

@miguel-bernardMiguel Bernard

@jamesjorJames

@pagespeed-greenPageSpeed Green

@rheinmahatmaRhein Mahatma

@dcollins_peak6Dan

@bin-fanBin Fan

@nateneadNate Nead

@evaveskovaEva Veskova Jackson

@dmytro-pogribnyyDmytro Pogribnyy

@KubilayKubilay Caglayan

@theronald248Jasmine Ronald