29-Elasticsearch 集群监控

Elasticsearch Stats 相关的 API

● Elasticsearch 提供了多个监控相关的 API

○ Node Stats： _nodes/stats

○ Cluster Stats: _cluster/stats

○ Index Stats: index_name/_stats

Elasticsearch Task API

● 查看 Task 相关的 API

○ Pending Cluster Tasks API: GET _cluster/pending_tasks

○ Task Management API :GET _tasks (可以用来 Cancel 一个 Task)

● 监控 Thread Pools

○ GET _nodes/thread_pool

○ GET _nodes/stats/thread_pool

○ GET _cat/thread_pool?v

○ GET _nodes/hot_threads

The Index & Query Slow Log

● 支持将分片上， Search 和 Fetch 阶段的慢 查询写入文件

● 支持为 Query 和 Fetch 分别定义阈值

● 索引级的动态设置，可以按需设置，或者通过Index Template 统一设定

● Slow log 文件通过 log4j2.properties 配 置

# 设置 Index Slowlogs
# the first 1000 characters of the doc's source will be logged
PUT my_index/_settings
{"index.indexing.slowlog":{"threshold.index":{"warn":"10s","info": "4s","debug":"2s","trace":"0s"},"level":"trace","source":1000  }
}# 设置查询
DELETE my_index
//"0" logs all queries
PUT my_index/
{"settings": {"index.search.slowlog.threshold": {"query.warn": "10s","query.info": "3s","query.debug": "2s","query.trace": "0s","fetch.warn": "1s","fetch.info": "600ms","fetch.debug": "400ms","fetch.trace": "0s"}}
}