Elastic Search 最佳參數設置

Ingest Node

• 可以預先處理, 或是 pipeline _doc
• 用量很大的話可以獨立出來

Shard

• each index in Elasticsearch is allocated 5 primary shards and 1 replica
• a primary shard can technically contain up to 2147483519 (Integer.MAX_VALUE - 128) documents
• 50 GB per shard
  • https://discuss.elastic.co/t/limit-for-shard-size/40032

Config

• Don’t Cross 32 GB!
  • The moral of the story is this: even when you have memory to spare, try to avoid crossing the 32 GB heap boundary. It wastes memory, reduces CPU performance, and makes the GC struggle with large heaps.
  • Java uses a trick called compressed oops to prevent wasting pointer space
  • https://www.elastic.co/guide/en/elasticsearch/guide/current/heap-sizing.html#heap-sizing
• bootstrap.memory_lock: true
• Set Xmx to no more than 50% of your physical RAM, to ensure that there is enough physical RAM left for kernel file system caches.

Index

• Force-merge read-only indices

Reference

• http://alexander.holbreich.org/elasticsearch-configuration/
• https://www.elastic.co/guide/en/elasticsearch/guide/current/deploy.html