es 集群配置更新失败 - 超时

Question

# DSL 控制台执行后，会返回 504 Timeout，但配置始终未被更新
# Shell 如下
curl -X PUT http://127.0.0.1:9200/_cluster/settings -d '{"transient":{"cluster.routing.allocation.total_shards_per_node":null}}'

{
  "error" : {
    "root_cause" : [
      {
        "type" : "process_cluster_event_timeout_exception",
        "reason" : "failed to process cluster event (cluster_update_settings) within 30s"
      }
    ],
    "type" : "process_cluster_event_timeout_exception",
    "reason" : "failed to process cluster event (cluster_update_settings) within 30s"
  },
  "status" : 503
}

Answer 1

原因可能比较复杂：
比如 索引太多、分片太多、集群正在处理的任务较多、内部连接因为 xxx 原因都在等待导致阻塞等。

情况紧急的的话，可以通过临时指定较长的超时时间来操作。

master_timeout
(Optional, time units) Specifies the period of time to wait for a connection to the master node. If no response is received before the timeout expires, the request fails and returns an error. Defaults to 30s.

# 使用参数 master_timeout=5m，来延长获取链接的默认时长
curl -X PUT http://127.0.0.1:9200/_cluster/settings?master_timeout=5m -d '{"transient":{"cluster.routing.allocation.total_shards_per_node":null}}'

Ref: https://www.elastic.co/guide/...