{"id":1367,"date":"2018-08-07T18:31:45","date_gmt":"2018-08-07T18:31:45","guid":{"rendered":"http:\/\/dbtut.com\/?p=1367"},"modified":"2018-11-09T13:40:15","modified_gmt":"2018-11-09T13:40:15","slug":"replica-set-health","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2018\/08\/07\/replica-set-health\/","title":{"rendered":"Replica set health"},"content":{"rendered":"<h3><\/h3>\n<h3><strong>Replication lag<\/strong><\/h3>\n<p>Typically, in our replica sets, we monitoring the replication lag, that is a measure of who far a secondary is behind the primary:<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/08\/417.png\" \/><\/p>\n<p>&nbsp;<\/p>\n<h3>Exist two types of replication:<\/h3>\n<p>Chained replication, configured by default.\u00a0 A chained replication occurs when a secondary member replicates from another secondary member instead of from the primary. Recommended for reducing the load of the primary.<\/p>\n<p>Primary replication needs to explicit configure. A primary replication occurs when all secondary members replicate from the primary.<\/p>\n<p>In mongo shell we get the information with <code>rs.printSlaveReplicationInfo()<\/code><\/p>\n<pre class=\"lang:default decode:true \">Output example\r\n\r\nsource: m1.example.net:27017\r\n\r\nsyncedTo: Thu Apr 10 2014 10:27:47 GMT-0400 (EDT)\r\n\r\n0 secs (0 hrs) behind the primary\r\n\r\nsource: m2.example.net:27017\r\n\r\nsyncedTo: Thu Apr 10 2014 10:27:47 GMT-0400 (EDT)\r\n\r\n0 secs (0 hrs) behind the primary<\/pre>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><strong>Oplog window <\/strong><\/h3>\n<p>The other important aspect that we need to be in mind, is the Oplog window, is the time difference between the oldest and newest entries in the oplog.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/08\/599.png\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>The oplog window tells us the amount of time to work with secondary members, for example:<\/p>\n<ul>\n<li>Add new secondary member<\/li>\n<li>Install new OS patch<\/li>\n<li>Install new MongoDB version<\/li>\n<li>Full resync of the secondary member<\/li>\n<li>Recover a secondary member from a failure<\/li>\n<\/ul>\n<p>For show information of oplog window in mongo shell <code>rs.printReplicationInfo()<\/code><\/p>\n<pre class=\"lang:default decode:true \">Output example\r\n\r\nconfigured oplog size:\u00a0\u00a0 192MB\r\n\r\nlog length start to end: 65422secs (18.17hrs)\r\n\r\noplog first event time:\u00a0 Mon Jun 23 2014 17:47:18 GMT-0400 (EDT)\r\n\r\noplog last event time:\u00a0\u00a0 Tue Jun 24 2014 11:57:40 GMT-0400 (EDT)\r\n\r\nnow:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Thu Jun 26 2014 14:24:39 GMT-0400 (EDT)<\/pre>\n<p>&nbsp;<\/p>\n<h3><strong>Conclusion<\/strong><\/h3>\n<p>It\u00b4s very important to monitor the health of our replica sets, the aspects to monitor are:<\/p>\n<p>Oplog lag<\/p>\n<p>OplogWindow<\/p>\n<p>We can use monitoring tools like Nagios, Mongo Compass, Atlas, to automating the monitoring and alert if something goes wrong.<\/p>\n\n<p>&nbsp;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_1367\" class=\"pvc_stats all  \" data-element-id=\"1367\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Replication lag Typically, in our replica sets, we monitoring the replication lag, that is a measure of who far a secondary is behind the primary: &nbsp; Exist two types of replication: Chained replication, configured by default.\u00a0 A chained replication occurs when a secondary member replicates from another secondary member instead of from the primary. Recommended &hellip;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_1367\" class=\"pvc_stats all  \" data-element-id=\"1367\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":67,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[1306],"tags":[1351,1348,1349,1347,1346,1350],"class_list":["post-1367","post","type-post","status-publish","format-standard","","category-mongodb","tag-mongodb-replica-health","tag-oplog-lag","tag-oplog-window","tag-oplogwindow","tag-replica-set-health","tag-replication-lag"],"aioseo_notices":[],"a3_pvc":{"activated":true,"total_views":464,"today_views":0},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - 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