WordPress.com 的 Elasticsearch

在「State of WordPress.com Elasticsearch Systems 2016」這邊描述他們 Elasticsearch 的架構。

有五個 cluster 打散,有跑 1.3.x 也有 1.7.x。把一般使用者與 VIP 分開,而全站的資料又是一組。另外在 2.3.x 的測試機上跑 en.support.wordpress.com 的資料 (看起來是短時間炸掉沒關係?XD)。

由於是自己生機器出來,所以機器的選擇上用大量的記憶體與 SSD 硬碟來換各種效能:

Typical data server config:
* 96GB RAM with 31GB for ES heap. Remaining gets used for file system caching
* 1-3 TB of SSD per server. In our testing SSDs are very worthwhile.

另外上面還是有疊 cache:

memcache timeouts vary from 30 seconds to 36 hours depending on use case

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