MySQL 5.0 introduced NDB Cluster, a storage engine which enables running several MySQL servers in a cluster. It uses high-availability, high-redundancy version of MySQL adapted for the distributed computing environment. This all sounds really nice, and in theory, depending on your application and scalability planning, it could spare you MANY hours of developing (squeezing) database logic inside your application logic which then gets highly dependable on master\/slave (active-pasive) configuration. And of course best reason of them all – instant failover. So I decided to give it a try. I used MySQL 5.0.45-0, because 5.1 sounded too much bleeding edge.<\/p>\n
MySQL Cluster is currently not supported on Microsoft Windows, you’ll have to install it somewhere else. Once you have it running, it’s time to import some data. Database schema of a my test dump mostly used MyIsam storage engine and few InnoDB tables. Before the import, change Engine=NDB in the dump and be aware, import takes ages even on a really fast servers (200 kb dump = cca 1 min ??). <\/p>\n
My best guess is, you will see a lot of HY00 errors when you start your import. Be patient, check one by one. Most of them are caused by non supported features of NDB but can be avoided. <\/p>\n
Here is a brief coverage of reasons for the problems which I encountered:<\/p>\n
The last error is really nasty one and will cause you to rethink your database schema and make a lot of changes to your application): Some help:<\/p>\n NDBCluster is something I’ll definitively have my four eyes on and watch it grow. Bugtracker on mysql is crawling with bugs, but this is something to be expected. I’ve tested 5.0, and there is a lot of stuff allready fixed in 5.1. My biggest disappointment was the fact that new nodes can’t be added to the cluster without shutting it down first. My conclusion is, that It is not yet ready for prime time. When it will be? when 5.1 is released into production I guess. Until then… We are on our own. :)<\/p>\n","protected":false},"excerpt":{"rendered":" MySQL 5.0 introduced NDB Cluster, a storage engine which enables running several MySQL servers in a cluster. It uses high-availability, high-redundancy version of MySQL adapted for the distributed computing environment. This all sounds really nice, and in theory, depending on your application and scalability planning, it could spare you MANY hours of developing (squeezing) database…<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/www.nivas.hr\/blog\/wp-json\/wp\/v2\/posts\/219"}],"collection":[{"href":"https:\/\/www.nivas.hr\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nivas.hr\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nivas.hr\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nivas.hr\/blog\/wp-json\/wp\/v2\/comments?post=219"}],"version-history":[{"count":0,"href":"https:\/\/www.nivas.hr\/blog\/wp-json\/wp\/v2\/posts\/219\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.nivas.hr\/blog\/wp-json\/wp\/v2\/media?parent=219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nivas.hr\/blog\/wp-json\/wp\/v2\/categories?post=219"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nivas.hr\/blog\/wp-json\/wp\/v2\/tags?post=219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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\nERROR 1118 (42000) at line 794: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8052. You have to change some columns to TEXT or BLOBs
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