{"id":45512,"date":"2024-04-15T21:59:04","date_gmt":"2024-04-15T21:59:04","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=45512"},"modified":"2024-04-15T21:59:04","modified_gmt":"2024-04-15T21:59:04","slug":"if-the-ip-address-or-hostname-of-a-data-node-changes","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/if-the-ip-address-or-hostname-of-a-data-node-changes\/","title":{"rendered":"If the IP address or hostname of a data node changes"},"content":{"rendered":"<p>[amp_mcq option1=&#8221;The namenode updates the mapping between file name and block name&#8221; option2=&#8221;The data in that data node is lost forever&#8221; option3=&#8221;The namenode need not update mapping between file name and block name&#8221; option4=&#8221;There namenode has to be restarted&#8221; correct=&#8221;option1&#8243;]<!--more--><\/p>\n<p>The correct answer is: A. The namenode updates the mapping between file name and block name.<\/p>\n<p>When the IP address or hostname of a data node changes, the namenode needs to update the mapping between file name and block name. This is because the namenode stores the location of each block of data on each data node. When the IP address or hostname of a data node changes, the namenode needs to update this information so that it can still access the data on that data node.<\/p>\n<p>If the namenode does not update the mapping, then it will not be able to access the data on the data node with the changed IP address or hostname. This can cause problems if the data on that data node is needed.<\/p>\n<p>The other options are incorrect because:<\/p>\n<ul>\n<li>Option B is incorrect because the data in that data node is not lost forever. The data is still stored on the data node, but the namenode cannot access it until it updates the mapping.<\/li>\n<li>Option C is incorrect because the namenode does need to update the mapping between file name and block name.<\/li>\n<li>Option D is incorrect because the namenode does not need to be restarted.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>[amp_mcq option1=&#8221;The namenode updates the mapping between file name and block name&#8221; option2=&#8221;The data in that data node is lost forever&#8221; option3=&#8221;The namenode need not update mapping between file name and block name&#8221; option4=&#8221;There namenode has to be restarted&#8221; correct=&#8221;option1&#8243;]<\/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":[],"class_list":["post-45512","post","type-post","status-publish","format-standard","hentry","category-cloud-computing","no-featured-image-padding"],"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>If the IP address or hostname of a data node changes<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/if-the-ip-address-or-hostname-of-a-data-node-changes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"If the IP address or hostname of a data node changes\" \/>\n<meta property=\"og:description\" content=\"[amp_mcq option1=&#8221;The namenode updates the mapping between file name and block name&#8221; 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