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Tag Archives: replica
MongoDB 的 replica-set 設定
Percona 的人寫了一份文件，以 MySQL DBA 的角度說明兩者在 replication 上的差異，然後示範怎麼在單機上架起三個 MongoDB 並且設定 replica-set：「First MongoDB replica-set Configuration for MySQL DBAs」。 這邊文章拿的是 Percona Server for MongoDB，不過應該也還行，並竟是拿 MongoDB 3.2 改的，而不是完全重寫，所以裡面的步驟拿到原版的 MongoDB 上應該也行... 可以拿 Docker 或是在 AWS 開一台 t2.medium 測試玩看看...
Amazon Aurora 支援跨區域 Read Replica
傳統的作法 (自己擁有機房時) 就是在兩個機房中間建立 site-to-site VPN (通常是 IPsec)，然後再用 MySQL 的 replication 接起來，而現在 Amazon Aurora 直接在界面上支援這件事情，可以在網頁上點一點開起來：「New – Cross-Region Read Replicas for Amazon Aurora」。 不過好像沒講到跨區的 VPC 對接設定問題？所以是透過他們自己的 network 接起來？這樣的話流量費用要怎麼算？
AWS 提供跨區的 MySQL Read Replica...
Amazon RDS 將提供跨區的 MySQL read replication。看起來是針對 5.6+ 的版本提供這個功能... 有兩篇官方文章，一篇是 CTO 發了一篇「Expanding the Cloud: Enabling Globally Distributed Applications and Diaster Recovery」，另外一篇是官方網誌上的「Cross-Region Read Replicas for Amazon RDS for MySQL」。 用圖表示比較容易懂： 在 US-East 建立 MySQL master，另外在 EU 與 Tokyo 建立 slave replication。不知道中間的 traffic … Continue reading
Amazon RDS 可以直接產生 Read Replica Replication 了...
以往要在 Amazon RDS 產生 Read Replica Replication 需要複雜的 snapshot 處理，但現在 AWS 直接提供這個功能了，而且可以同時生很多台：「New Read Replica Capabilities for Amazon RDS」。 這有多重要呢？以前因應流量瞬間爆增時的方式是增加 web server，並且利用 cache (可能是 memcached) 降低對後端的 query 數量。但因為引入 cache，平常就得處理 cache invalidate 的問題。 而這個方式平常只要處理讀寫分離就可以了。當量爆增時除了 web server 增加，直接增加後端的 RDS server (Read Replica Replication)，甚至可以分層： … Continue reading