[elasticsearch]heap out of memory(OOM)

가이드에는 힙사이즈를 전체 물리 메모리의 50%로 셋팅하는것으로 권장.
32기가라면 16기가정도로 셋팅.

Set Xms and Xmx to no more than 50% of your total memory. Elasticsearch requires memory for purposes other than the JVM heap. For example, Elasticsearch uses off-heap buffers for efficient network communication and relies on the operating system’s filesystem cache for efficient access to files. The JVM itself also requires some memory. It’s normal for Elasticsearch to use more memory than the limit configured with the Xmx setting.

힙 메모리 사용률 체크
엘라스틱서치 로그에서 확인하거나 REST API로 확인가능.

[darksharavim]curl http://localhost:9200/_cat/nodes?v
ip              heap.percent ram.percent cpu load_1m load_5m load_15m node.role   master name
1xx.2xx.1xx.xx1           26          95   4    0.07    0.11     0.21 cdfhilmrstw *      node-1

https://www.elastic.co/guide/en/elasticsearch/reference/8.4/advanced-configuration.html#set-jvm-heap-size

Advanced configuration | Elasticsearch Guide [8.4] | Elastic

https://www.elastic.co/kr/blog/significantly-decrease-your-elasticsearch-heap-memory-usage

Elasticsearch 힙 메모리 사용 대폭 감소