Created
January 29, 2021 00:20
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| require 'mysql2' | |
| begin | |
| client = Mysql2::Client.new(:host => "db1-proxy.proxy-hogehoge.amazonaws.com", :username => "root", :password => '') | |
| while true | |
| query = "SHOW GLOBAL VARIABLES WHERE Variable_Name IN ('innodb_read_only', 'server_uuid', 'aurora_server_id');" | |
| client.query(query).each do |row| | |
| puts row | |
| end | |
| sleep(0.2) | |
| end | |
| rescue => e | |
| puts e | |
| retry | |
| end |
もっと速度を落としてqueryしている場合、切り替わり時にRDS Proxyとの接続が維持される。
{"Variable_name"=>"server_uuid", "Value"=>"d9a929b1-9d76-3cfc-8b7c-7f87a871eee0"}
{"Variable_name"=>"aurora_server_id", "Value"=>"database-1-writer"}
{"Variable_name"=>"innodb_read_only", "Value"=>"OFF"}
{"Variable_name"=>"server_uuid", "Value"=>"d9a929b1-9d76-3cfc-8b7c-7f87a871eee0"}
{"Variable_name"=>"aurora_server_id", "Value"=>"database-1-writer"}
{"Variable_name"=>"innodb_read_only", "Value"=>"OFF"}
{"Variable_name"=>"server_uuid", "Value"=>"d9a929b1-9d76-3cfc-8b7c-7f87a871eee0"}
{"Variable_name"=>"aurora_server_id", "Value"=>"database-1-instance-1"}
{"Variable_name"=>"innodb_read_only", "Value"=>"OFF"}
{"Variable_name"=>"server_uuid", "Value"=>"d9a929b1-9d76-3cfc-8b7c-7f87a871eee0"}
{"Variable_name"=>"aurora_server_id", "Value"=>"database-1-instance-1"}
{"Variable_name"=>"innodb_read_only", "Value"=>"OFF"}
{"Variable_name"=>"server_uuid", "Value"=>"d9a929b1-9d76-3cfc-8b7c-7f87a871eee0"}
{"Variable_name"=>"aurora_server_id", "Value"=>"database-1-instance-1"}
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0.2秒単位でクエリしながら、Failoverさせると、clientがエラーを起こしWriterへの接続が切れて再接続する必要が出てくる。
際接続すると新しいwriterへ繋がる。繋がったままread_onlyにはならない。