{"id":45535,"date":"2024-04-15T21:59:24","date_gmt":"2024-04-15T21:59:24","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=45535"},"modified":"2024-04-15T21:59:24","modified_gmt":"2024-04-15T21:59:24","slug":"hadoop-achieves-reliability-by-replicating-the-data-across-multiple-hosts-and-hence-does-not-require-storage-on-hosts","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/hadoop-achieves-reliability-by-replicating-the-data-across-multiple-hosts-and-hence-does-not-require-storage-on-hosts\/","title":{"rendered":"Hadoop achieves reliability by replicating the data across multiple hosts and hence does not require . . . . . . . . storage on hosts."},"content":{"rendered":"<p>\r\n    <!-- Check if it's an AMP page -->\r\n            <!-- Non-AMP version -->\r\n        <div class=\"mcq-container\" data-quiz-id=\"quizState_6a9736b386c5e\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"false\">\r\n                    raid                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"true\">\r\n                    standard raid levels                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"false\">\r\n                    zfs                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    operating system                <\/div>\r\n                            \r\n            <!-- Feedback messages for non-AMP -->\r\n            <div class=\"feedback\" data-feedback=\"wrong\">Answer is Right!<\/div>\r\n            <div class=\"feedback\" data-feedback=\"right\">Answer is Wrong!<\/div>\r\n        <\/div>\r\n\r\n        <script>\r\n        document.addEventListener('DOMContentLoaded', function () {\r\n            var containers = document.querySelectorAll('.mcq-container');\r\n\r\n            containers.forEach(function(container) {\r\n                var options = container.querySelectorAll('.option');\r\n                var feedbackSelect = container.querySelector('[data-feedback=\"select\"]');\r\n                var feedbackWrong = container.querySelector('[data-feedback=\"wrong\"]');\r\n                var feedbackRight = container.querySelector('[data-feedback=\"right\"]');\r\n\r\n                options.forEach(function(option) {\r\n                    option.addEventListener('click', function() {\r\n                        var selectedOption = option.getAttribute('data-option-key');\r\n                        var isCorrect = option.getAttribute('data-is-correct') === 'true';\r\n\r\n                        \/\/ Remove previous selections\r\n                        options.forEach(function(opt) {\r\n                            opt.classList.remove('correct', 'incorrect');\r\n                        });\r\n\r\n                        \/\/ Add the correct\/incorrect class\r\n                        if (isCorrect) {\r\n                            option.classList.add('correct');\r\n                            feedbackRight.hidden = false;\r\n                            feedbackWrong.hidden = true;\r\n                        } else {\r\n                            option.classList.add('incorrect');\r\n                            feedbackRight.hidden = true;\r\n                            feedbackWrong.hidden = false;\r\n                        }\r\n\r\n                        \/\/ Hide select feedback\r\n                        feedbackSelect.hidden = true;\r\n                    });\r\n                });\r\n            });\r\n        });\r\n        <\/script>\r\n    \r\n    <!--more--><\/p>\n<p>The correct answer is: <strong>B. standard raid levels<\/strong><\/p>\n<p>Hadoop achieves reliability by replicating the data across multiple hosts. This means that if one host fails, the data is still available on the other hosts. This makes it unnecessary to use standard RAID levels, which are designed to protect data from disk failures.<\/p>\n<p>RAID (Redundant Array of Independent Disks) is a data storage technology that combines multiple disk drives into a logical unit, providing greater performance, reliability, and capacity than a single disk drive. There are many different RAID levels, each with its own trade-offs between performance, reliability, and capacity.<\/p>\n<p>Standard RAID levels are designed to protect data from disk failures. For example, RAID 1 provides data redundancy by mirroring data across two disks. If one disk fails, the data is still available on the other disk. RAID 5 provides data redundancy and performance by striping data across multiple disks and using parity bits to reconstruct data if a disk fails.<\/p>\n<p>However, standard RAID levels are not necessary for Hadoop, because Hadoop already achieves data redundancy by replicating data across multiple hosts. This means that if one host fails, the data is still available on the other hosts. Therefore, there is no need to use standard RAID levels, which can add complexity and cost to a Hadoop system.<\/p>\n<p>In addition, <div class=\"youtube-subscribe-container\">\r\n        <a href=\"https:\/\/www.youtube.com\/channel\/UCNHT8lW-JmLC68rjBfZhdkg?sub_confirmation=1\" target=\"_blank\" class=\"youtube-subscribe-button\">\r\n            <span class=\"youtube-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 576 512\">\r\n                    <path d=\"M549.7 124.1c-6.3-23.7-24.8-42.3-48.3-48.6C458.8 64 288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Subscribe on YouTube\r\n        <\/a>\r\n    <\/div> standard RAID levels can actually reduce the performance of Hadoop. This is because RAID levels typically <div class=\"telegram-channel-container\">\r\n        <a href=\"https:\/\/t.me\/pscnotes2025\" target=\"_blank\" class=\"telegram-channel-button\">\r\n            <span class=\"telegram-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 496 512\">\r\n                    <path fill=\"white\" d=\"M248,8C111,8,0,119,0,256s111,248,248,248s248-111,248-248S385,8,248,8z M362,177L320,367c-3,14-10,18-20,14l-56-41l-27,26 c-3,3-5,5-10,5l4-63L323,196c5-5-1-7-8-3l-98,62l-42-13c-9-3-10-9,2-14l162-63C351,160,365,164,362,177z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Join Our Telegram Channel\r\n        <\/a>\r\n    <\/div> require additional hardware and software, which can add overhead to the system. Additionally, RAID levels can sometimes cause performance bottlenecks, especially if the RAID controller is not properly configured.<\/p>\n<p>Therefore, it is generally recommended to avoid using standard RAID levels with Hadoop. Instead, it is better to use a distributed file system that is designed for high performance and reliability, such as HDFS.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Join Our Telegram Channel Subscribe on YouTube<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[728],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hadoop achieves reliability by replicating the data across multiple hosts and hence does not require . . . . . . . . storage on hosts.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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