{"id":275,"date":"2021-07-12T17:44:14","date_gmt":"2021-07-12T17:44:14","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=275"},"modified":"2021-09-14T09:36:20","modified_gmt":"2021-09-14T09:36:20","slug":"how-to-recover-a-namenode-when-it-is-down","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/big-data\/how-to-recover-a-namenode-when-it-is-down\/","title":{"rendered":"How to recover a NameNode when it is down ?"},"content":{"rendered":"<div class=\"TextHeading\">\n<div class=\"hddn\">\n<h2 id=\"how-to-recover-a-namenode-when-it-is-down\" class=\"color-pink\" style=\"text-align: justify;\">How to recover a NameNode when it is down ?<\/h2>\n<\/div>\n<\/div>\n<div class=\"ImageContent\" style=\"text-align: justify;\">\n<div class=\"hddn\"><img decoding=\"async\" class=\"img-responsive center-block aligncenter\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/hadoop\/how-to-recover-a-name-node.gif\" alt=\"How to recover a NameNode\" \/><\/div>\n<\/div>\n<div class=\"Content\">\n<div class=\"hddn\">\n<ul style=\"text-align: justify;\">\n<li style=\"list-style-type: none;\">\n<ul>\n<li>The following steps need to execute to make the\u00a0<a href=\"https:\/\/forums.wikitechy.com\/question-category\/hadoop\/\">Hadoop<\/a>\u00a0cluster up and running :\n<ul>\n<li>Use the\u00a0<b>FsImage<\/b>\u00a0which is file system metadata replica to start a new NameNode.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<div class=\"ImageContent\" style=\"text-align: justify;\">\n<div class=\"hddn\"><img decoding=\"async\" class=\"img-responsive center-block aligncenter\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/hadoop\/how-to-recover-a-namenode-when-it-is-down.png\" alt=\"Name Node\" \/><\/div>\n<\/div>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"text-align: justify;\">Configure the DataNodes and also the clients to make them acknowledge the newly started\u00a0<a href=\"https:\/\/forums.wikitechy.com\/question\/what-are-active-and-passive-namenodes-2\/\" target=\"_parent\" rel=\"noopener\">NameNode<\/a>.<\/li>\n<li style=\"text-align: justify;\">Once the new NameNode completes loading the last checkpoint FsImage which has received enough block reports from the DataNodes, it will start to serve the client.<\/li>\n<li style=\"text-align: justify;\">In case of large Hadoop clusters, the NameNode recovery process consumes a lot of time which turns out to be a more significant challenge in case of routine maintenance.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Answer : Use the FsImage which is file system metadata&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1065],"tags":[195,1272,1119,360,1270,203,199,214,1120,1284,205,1269,485,222,484,1305,1302,1292,1288,1275,1279,1280,1293,1281,1274,1277,1278,1266,1285,1301,1283,1289,1304,1282,1295,1276,1273,1300,196,1303,212,286,970,1291,1290,1294,1298,1296,1271,1262,366,1287,288,367,1263,206,1299,1297,975,200,974,197,280,364,1267,1265,1286,1264,1268,968,216,285,1121],"class_list":["post-275","post","type-post","status-publish","format-standard","hentry","category-big-data","tag-accenture-interview-questions-and-answers","tag-active-and-passive-namenode-in-hadoop","tag-att-interview-questions-and-answers","tag-atos-interview-questions-and-answers","tag-can-you-access-cluster-and-data-if-namenode-is-down","tag-capgemini-interview-questions-and-answers","tag-casting-networks-india-pvt-limited-interview-questions-and-answers","tag-cgi-group-inc-interview-questions-and-answers","tag-collabera-technologiesinterview-questions-and-answers","tag-datanode-and-namenode-in-hadoop","tag-dell-international-services-india-pvt-ltd-interview-questions-and-answers","tag-demonstrate-what-are-the-different-measures-jobtracker-takes-when-namenode-is-down","tag-ernst-young-interview-questions-and-answers","tag-flipkart-interview-questions-and-answers","tag-genpact-interview-questions-and-answers","tag-hadoop-datanode-namenode","tag-hadoop-get-active-namenode","tag-hadoop-namenode","tag-hadoop-namenode-architecture","tag-hadoop-namenode-backup","tag-hadoop-namenode-configuration","tag-hadoop-namenode-datanode","tag-hadoop-namenode-format","tag-hadoop-namenode-format-command","tag-hadoop-namenode-high-availability","tag-hadoop-namenode-is-in-safe-mode","tag-hadoop-namenode-port","tag-hadoop-namenode-recovery","tag-hadoop-namenode-url","tag-hadoop-no-namenode-to-stop","tag-hadoop-secondary-namenode-configuration","tag-hadoop-standby-namenode","tag-hadoop-start-namenode","tag-hadoop-start-namenode-command","tag-hdfs-namenode","tag-hdfs-namenode-command","tag-how-to-find-namenode-in-hadoop","tag-how-to-start-namenode-in-hadoop","tag-ibm-interview-questions-and-answers","tag-in-hadoop-1-0-secondary-namenode-is-backup-of-namenode","tag-indecomm-global-services-interview-questions-and-answers","tag-lt-infotech-interview-questions-and-answers","tag-mindtree-interview-questions-and-answers","tag-name-node","tag-name-node-is-in-safe-mode","tag-namenode","tag-namenode-and-datanode","tag-namenode-and-datanode-in-hadoop","tag-namenode-high-availability","tag-namenode-is-down","tag-netapp-interview-questions-and-answers","tag-node-in-hadoop","tag-r-systems-interview-questions-and-answers","tag-rbs-india-development-centre-pvt-ltd-interview-questions-and-answers","tag-recover-namenode-failure","tag-sap-labs-india-pvt-ltd-interview-questions-and-answers","tag-secondary-namenode","tag-secondary-namenode-in-hadoop","tag-tata-consultancy-service-interview-questions-and-answers","tag-tech-mahindra-interview-questions-and-answers","tag-trigent-software-interview-questions-and-answers","tag-unitedhealth-group-interview-questions-and-answers","tag-virtusa-consulting-services-pvt-ltd-interview-questions-and-answers","tag-wells-fargo-interview-questions-and-answers","tag-what-happens-if-namenode-is-down","tag-what-happens-when-a-user-submits-a-job-to-hadoop-and-the-name-node-is-down","tag-what-is-namenode-and-data","tag-what-will-you-do-when-namenode-is-down","tag-when-namenode-is-down-what-does-the-jobtracker-do","tag-wipro-infotech-interview-questions-and-answers","tag-wipro-interview-questions-and-answers","tag-xoriant-solutions-pvt-ltd-interview-questions-and-answers","tag-zs-associates-interview-questions-and-answers"],"yoast_head":"<!-- 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