干货 | Elasticsearch集群黄色原因的终极探秘

curl -XGET 'http://localhost:9200/_cluster/health?pretty=true'  
{
 "cluster_name" : "astrung",
 "status" : "yellow",
 "timed_out" : false,
 "number_of_nodes" : 2,
 "number_of_data_nodes" : 2,
 "active_primary_shards" : 22,
 "active_shards" : 22,
 "relocating_shards" : 0,
 "initializing_shards" : 2,
 "unassigned_shards" : 20
}
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curl -XGET 'http://localhost:9200/_cat/shards?v'
 index          shard prirep state        docs  store ip          node 
 _river         0     p      STARTED         2  8.1kb 192.168.1.3 One  
 _river         0     r      UNASSIGNED                                
 megacorp       4     p      STARTED         1  3.4kb 192.168.1.3 One  
 megacorp       4     r      UNASSIGNED                                
 megacorp       0     p      STARTED         2  6.1kb 192.168.1.3 One  
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GET /_cluster/allocation/explain
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GET _cat/shards?h=index,shard,prirep,state,unassigned.reason
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index.number_of_shards：5
index.number_of_replicas：1
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PUT /cs_indexs/_settings
{
  "number_of_replicas": 0
}
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POST /cs_indexs/_forcemerge?max_num_segments=1
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PUT /_template/index_defaults 
{
  "template": "*", 
  "settings": {
  "number_of_replicas": 0
  }
}
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POST /_cluster/reroute
  {
  "commands": [
    {
      "allocate_replica": {
        "index": "cs_indexs",
        "shard": 0,   # 重新分配的分片（标记黄色的分片）
        "node": "es-2"
      }
    }
  ]
}
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POST /_cluster/reroute
{
    "commands" : [
        {
            "move" : {
                "index" : "test", "shard" : 0,
                "from_node" : "node1", "to_node" : "node2"
            }
        },
        {
          "allocate_replica" : {
                "index" : "test", "shard" : 1,
                "node" : "node3"
          }
        }
    ]
}
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[root@localhost home]# df -h
Filesystem           Size  Used Avail Use% Mounted on
/dev/xvda1          1014M  165M  849M  17% /boot
/dev/mapper/cl-home  694G  597G   98G  86% /home
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DELETE  cs_indexs
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chown -R elasticsearch:elasticsearch data
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