Elasticsearch 简明教程

Elasticsearch - Cluster APIs

群集 API 用于获取关于群集及其节点的信息并在其中进行更改。要调用此 API,我们需要指定节点名称、地址或 _local。

GET /_nodes/_local

在运行以上代码时,我们得到响应,如下所示:-

………………………………………………
cluster_name" : "elasticsearch",
   "nodes" : {
      "FKH-5blYTJmff2rJ_lQOCg" : {
         "name" : "ubuntu",
         "transport_address" : "127.0.0.1:9300",
         "host" : "127.0.0.1",
         "ip" : "127.0.0.1",
         "version" : "7.0.0",
         "build_flavor" : "default",
         "build_type" : "tar",
         "build_hash" : "b7e28a7",
         "total_indexing_buffer" : 106502553,
         "roles" : [
            "master",
            "data",
            "ingest"
         ],
         "attributes" : {
………………………………………………

Cluster Health

此 API 用于通过附加“health”关键字来获取有关群集运行状况的状态。

GET /_cluster/health

在运行以上代码时,我们得到响应,如下所示:-

{
   "cluster_name" : "elasticsearch",
   "status" : "yellow",
   "timed_out" : false,
   "number_of_nodes" : 1,
   "number_of_data_nodes" : 1,
   "active_primary_shards" : 7,
   "active_shards" : 7,
   "relocating_shards" : 0,
   "initializing_shards" : 0,
   "unassigned_shards" : 4,
   "delayed_unassigned_shards" : 0,
   "number_of_pending_tasks" : 0,
   "number_of_in_flight_fetch" : 0,
   "task_max_waiting_in_queue_millis" : 0,
   "active_shards_percent_as_number" : 63.63636363636363
}

Cluster State

此 API 用于通过附加“state”关键字 URL 来获取有关群集的状态信息。状态信息包含版本、主节点、其他节点、路由表、元数据和块。

GET /_cluster/state

在运行以上代码时,我们得到响应,如下所示:-

………………………………………………
{
   "cluster_name" : "elasticsearch",
   "cluster_uuid" : "IzKu0OoVTQ6LxqONJnN2eQ",
   "version" : 89,
   "state_uuid" : "y3BlwvspR1eUQBTo0aBjig",
   "master_node" : "FKH-5blYTJmff2rJ_lQOCg",
   "blocks" : { },
   "nodes" : {
      "FKH-5blYTJmff2rJ_lQOCg" : {
      "name" : "ubuntu",
      "ephemeral_id" : "426kTGpITGixhEzaM-5Qyg",
      "transport
   }
………………………………………………

Cluster Stats

此 API 有助于通过使用“stats”关键字检索有关群集的统计信息。此 API 返回分片数、存储大小、内存使用情况、节点数、角色、操作系统和文件系统。

GET /_cluster/stats

在运行以上代码时,我们得到响应,如下所示:-

………………………………………….
"cluster_name" : "elasticsearch",
"cluster_uuid" : "IzKu0OoVTQ6LxqONJnN2eQ",
"timestamp" : 1556435464704,
"status" : "yellow",
"indices" : {
   "count" : 7,
   "shards" : {
      "total" : 7,
      "primaries" : 7,
      "replication" : 0.0,
      "index" : {
         "shards" : {
         "min" : 1,
         "max" : 1,
         "avg" : 1.0
      },
      "primaries" : {
         "min" : 1,
         "max" : 1,
         "avg" : 1.0
      },
      "replication" : {
         "min" : 0.0,
         "max" : 0.0,
         "avg" : 0.0
      }
………………………………………….

Cluster Update Settings

此 API 允许您通过使用“settings”关键字更新群集的设置。有两种类型的设置 - 持久性(在重启后应用)和瞬态(无法在完全群集重启后依然存在)。

Node Stats

此 API 用于检索集群的一个或多个节点的统计信息。节点统计信息几乎与集群相同。

GET /_nodes/stats

在运行以上代码时,我们得到响应,如下所示:-

{
   "_nodes" : {
      "total" : 1,
      "successful" : 1,
      "failed" : 0
   },
   "cluster_name" : "elasticsearch",
   "nodes" : {
      "FKH-5blYTJmff2rJ_lQOCg" : {
         "timestamp" : 1556437348653,
         "name" : "ubuntu",
         "transport_address" : "127.0.0.1:9300",
         "host" : "127.0.0.1",
         "ip" : "127.0.0.1:9300",
         "roles" : [
            "master",
            "data",
            "ingest"
         ],
         "attributes" : {
            "ml.machine_memory" : "4112797696",
            "xpack.installed" : "true",
            "ml.max_open_jobs" : "20"
         },
………………………………………………………….

Nodes hot_threads

此 API 可帮助您检索集群中每个节点上当前热门线程的相关信息。

GET /_nodes/hot_threads

在运行以上代码时,我们得到响应,如下所示:-

:::{ubuntu}{FKH-5blYTJmff2rJ_lQOCg}{426kTGpITGixhEzaM5Qyg}{127.0.0.1}{127.0.0.1:9300}{ml.machine_memory=4112797696,
xpack.installed=true, ml.max_open_jobs=20}
 Hot threads at 2019-04-28T07:43:58.265Z, interval=500ms, busiestThreads=3,
ignoreIdleThreads=true: