Elasticsearch 文档到分片路由算法查询文档到分片路由信息

比眉伴天荒 2023-01-16 03:22 160阅读 0赞

根据文档ID计算HASH值，然后对主分片数量进行取模，得到对应的主分片，也可以使用指定参数，进行HASH值的计算，让特定的文档落在特定的分片上。

# 添加测试文档
    PUT /nba/_doc/1
    {
      "name": "哈登",
      "team_name": "⽕箭",
      "position": "得分后卫",
      "play_year": "10",
      "jerse_no": "13"
    }

# 查询文档对应的分片
    GET /nba/_search_shards?routing=1

{
      "nodes" : {
        "PzD8IHhVSaagx91DWl8ocA" : {
          "name" : "node-3",
          "ephemeral_id" : "-QM73xkSScy0yfJL_ueCUA",
          "transport_address" : "192.168.204.163:9302",
          "attributes" : {
            "ml.machine_memory" : "3953942528",
            "ml.max_open_jobs" : "20",
            "xpack.installed" : "true"
          }
        },
        "T8iOyJBySOO-ULvs7tbc5A" : {
          "name" : "node-1",
          "ephemeral_id" : "YYzgcowiQJacStaMPKN3Yg",
          "transport_address" : "192.168.204.163:9300",
          "attributes" : {
            "ml.machine_memory" : "3953942528",
            "xpack.installed" : "true",
            "ml.max_open_jobs" : "20"
          }
        }
      },
      "indices" : {
        "nba" : { }
      },
      "shards" : [
        [
          {
            "state" : "STARTED",
            "primary" : true,
            "node" : "T8iOyJBySOO-ULvs7tbc5A",
            "relocating_node" : null,
            "shard" : 0,
            "index" : "nba",
            "allocation_id" : {
              "id" : "kS-sn_elTJ6qRNB6bYhwgw"
            }
          },
          {
            "state" : "STARTED",
            "primary" : false,
            "node" : "PzD8IHhVSaagx91DWl8ocA",
            "relocating_node" : null,
            "shard" : 0,
            "index" : "nba",
            "allocation_id" : {
              "id" : "zWLfXN-cQFqtOtPyLNWSyw"
            }
          }
        ]
      ]
    }

根据输出结果，可以查询到文档路由的分片信息。