避免内存浪费， 64G 内存可不可以运行两个 ES？

[alwayshere]

ES 最大内存设定为 32G，我现在手上服务器 64G，正好有两个项目，可不可以跑两个 ES ？

[yuikns]

Heap is definitely important to Elasticsearch. It is used by many in-memory data structures to provide fast operation. But with that said, there is another major user of memory that is off heap: Lucene.


https://www.elastic.co/guide/en/elasticsearch/guide/current/heap-sizing.html

[yuikns]

The standard recommendation is to give 50% of the available memory to Elasticsearch heap, while leaving the other 50% free. It won ’ t go unused; Lucene will happily gobble up whatever is left over.

[myhot21]

可以运行两个 es 的，只是如果两个 es 都设为 32g，可能会不稳定或性能有问题，为了稳定性，一般需要预留一部分内存给操作系统使用。

[blueskea]

建议多装几块硬盘，data 分到不同的硬盘上去，或者上 ssd 缓解下 io 的压力

[aqqwiyth]

io 能抗的住的话完全可以. ES 的瓶颈在硬盘