ES出现unassigned_shards解决方法

1. 查看健康状态信息

$ curl -XGET http://localhost:9200/_cluster/health\?pretty
{
  "cluster_name" : "docker-cluster",
  "status" : "yellow",
  "timed_out" : false,
  "number_of_nodes" : 1,
  "number_of_data_nodes" : 1,
  "active_primary_shards" : 23,
  "active_shards" : 23,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 6,
  "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" : 79.3103448275862
}

2.找到未分片的索引

$ curl -s "http://localhost:9200/_cat/shards" | grep UNASSIGNED
test                             0 r UNASSIGNED
logstash-2021.01.22              0 r UNASSIGNED
logstash-2021.01.23              0 r UNASSIGNED
logstash-2021.01.18              0 r UNASSIGNED
logstash-2021.01.19              0 r UNASSIGNED

3.强制分配主分片

#先查节点唯一标识
$ curl -XGET http://localhost:9200/_nodes/process?pretty
{
  "_nodes" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "cluster_name" : "docker-cluster",
  "nodes" : {
    "NOmRjiA6T3i_plKA340Ong" : {
      "name" : "4abbcb382dc4",
      "transport_address" : "172.17.0.2:9300",
      "host" : "172.17.0.2",
      "ip" : "172.17.0.2",
      "version" : "7.4.2",
      "build_flavor" : "default",
      "build_type" : "docker",
      "build_hash" : "2f90bbf7b93631e52bafb59b3b049cb44ec25e96",
      "roles" : [
        "ingest",
        "master",
        "data",
        "ml"
      ],
      "attributes" : {
        "ml.machine_memory" : "2147483648",
        "xpack.installed" : "true",
        "ml.max_open_jobs" : "20"
      },
      "process" : {
        "refresh_interval_in_millis" : 1000,
        "id" : 1,
        "mlockall" : false
      }
    }
  }
}

#强制分配主分片
$ curl -XPOST localhost:9200/_cluster/reroute -d '
{
    "commands": [
        {
           "allocate_replica": {
                  "index": "logstash-2021.01.18", 
                  "shard": 0, 
                  "node": "NOmRjiA6T3i_plKA340Ong",
                  "allow_primary": "true"
             }
        }
     ]
}'

#或者在kibana页面执行
POST _cluster/reroute
{
    "commands": [
        {
           "allocate_replica": {
                  "index": "logstash-2021.01.18", 
                  "shard": 0, 
                  "node": "NOmRjiA6T3i_plKA340Ong",
                  "allow_primary": "true"
             }
        }
     ]
}

#批量处理的脚本(当数量很多时, 注意替换node的名字)
#!/bin/bash

for index in $(curl  -s 'http://localhost:9200/_cat/shards' | grep UNASSIGNED | awk '{print $1}' | sort | uniq); do
    for shard in $(curl  -s 'http://localhost:9200/_cat/shards' | grep UNASSIGNED | grep $index | awk '{print $2}' | sort | uniq); do
        echo  $index $shard

        curl -XPOST 'localhost:9200/_cluster/reroute' -d "{
            'commands' : [ {
                  'allocate' : {
                      'index' : $index,
                      'shard' : $shard,
                      'node' : 'Master',
                      'allow_primary' : true
                  }
                }
            ]
        }"

        sleep 5
    done
done

4.删除该索引

如果这个index 已经不用了，直接删除 index，这些 unassigned 的分片也会被干掉，集群恢复正常

1	$ curl -XDELETE localhost:9200/logstash-2021.01.18