IO流控
慢日志
热点线程发现


IO流控
节点级和索引级 

节点级别限流


indices.store.throttle.type 
none/merge/all
none   不流控
merge  对合并做IO流控
all    对所有的操作做IO流控

indices.store.throttle.max_bytes_per_sec

索引级别限流

index.store.throttle.type
none/merge/all
index.store.throttle.max_bytes_per_sec


慢日志
类似 mysql 慢查询
默认不开启
query fetch index

PUT /my_index/_settings

{
"index.search.slowlog.threshold.query.warn" : "10s",
"index.search.slowlog.threshold.fetch.debug": "500ms",
"index.indexing.slowlog.threshold.index.info": "5s"
}


index.search.slowlog.threshold.query.warn: 10s
index.search.slowlog.threshold.query.info: 5s
index.search.slowlog.threshold.query.debug: 2s
index.search.slowlog.threshold.query.trace: 500ms

index.search.slowlog.threshold.fetch.warn: 1s
index.search.slowlog.threshold.fetch.info: 800ms
index.search.slowlog.threshold.fetch.debug: 500ms
index.search.slowlog.threshold.fetch.trace: 200ms

log4j2.properties  配置


热点线程发现

集群突然变慢 找到消耗资源最多的线程

/_nodes/hot_threads