ElasticSearch之Analyze index disk usage API

本API用于分析、统计指定index当前占用的存储空间。
考虑到本特性目前仍然处于预览状态，因此使用方法、参数等可能会发生变化，或者未来也许会被删除。
本API暂时不建议在生产系统中使用。

命令样例如下：

curl -X POST "https://localhost:9200/testindex_001/_disk_usage?run_expensive_tasks=true&pretty" --cacert $ES_HOME/config/certs/http_ca.crt -u "elastic:ohCxPH=QBE+s5=*lo7F9"

执行结果的样例，如下：

{
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "testindex_001" : {
    "store_size" : "249b",
    "store_size_in_bytes" : 249,
    "all_fields" : {
      "total" : "0b",
      "total_in_bytes" : 0,
      "inverted_index" : {
        "total" : "0b",
        "total_in_bytes" : 0
      },
      "stored_fields" : "0b",
      "stored_fields_in_bytes" : 0,
      "doc_values" : "0b",
      "doc_values_in_bytes" : 0,
      "points" : "0b",
      "points_in_bytes" : 0,
      "norms" : "0b",
      "norms_in_bytes" : 0,
      "term_vectors" : "0b",
      "term_vectors_in_bytes" : 0,
      "knn_vectors" : "0b",
      "knn_vectors_in_bytes" : 0
    },
    "fields" : { }
  }
}

方法参数
ignore_unavailable，默认值为false。

• true，本操作执行时跳过失效或者不可用的index。
• false，本操作执行时，遇到失效或者不可用的index，则报错，样例如下：

  {
    "error" : {
        "root_cause" : [
        {
            "type" : "index_not_found_exception",
            "reason" : "no such index [testindex_002]",
            "resource.type" : "index_or_alias",
            "resource.id" : "testindex_002",
            "index_uuid" : "_na_",
            "index" : "testindex_002"
        }
        ],
        "type" : "index_not_found_exception",
        "reason" : "no such index [testindex_002]",
        "resource.type" : "index_or_alias",
        "resource.id" : "testindex_002",
        "index_uuid" : "_na_",
        "index" : "testindex_002"
    },
    "status" : 404
  }
  

wait_for_active_shards，默认值为1，即主副本。
执行本操作时，必须处于可用状态的副本的数量。

run_expensive_tasks，默认值为false。
计算空间占用率的操作需要消耗大量的资源。

• true，执行运算操作。
• false，提示错误，样例如下：

  {
    "error" : {
        "root_cause" : [
        {
            "type" : "illegal_argument_exception",
            "reason" : "analyzing the disk usage of an index is expensive and resource-intensive, the parameter [run_expensive_tasks] must be set to [true] in order for the task to be performed."
        }
        ],
        "type" : "illegal_argument_exception",
        "reason" : "analyzing the disk usage of an index is expensive and resource-intensive, the parameter [run_expensive_tasks] must be set to [true] in order for the task to be performed."
    },
    "status" : 400
  }
  

相关资料

• Analyze index disk usage API