Elasticsearch 7 : 文檔 _id 的長度限制

 

 

PUT student
{
  "mappings" : {
    "properties" : {
      "name" : {
        "type" : "keyword"
      }
    }
  },
  "settings" : {
    "index" : {
      "number_of_shards" : 1
    }
  }
}

插入簡單數據測試

POST student/_doc/1
{
  "name": "1111"
}

成功插入。

POST student/_doc/0123456789
{
  "name": "2222"
}

成功插入。

插入 _id 長度為 230 字節的數據

POST student/_doc/0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789
{
  "name": "3333"
}

成功。

插入 _id 長度為 648 字節的數據（會失敗）

POST student/_doc/0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789
{
  "name": "4444"
}

報錯如下：

{
  "error": {
    "root_cause": [
      {
        "type": "action_request_validation_exception",
        "reason": "Validation Failed: 1: id is too long, must be no longer than 512 bytes but was: 648;"
      }
    ],
    "type": "action_request_validation_exception",
    "reason": "Validation Failed: 1: id is too long, must be no longer than 512 bytes but was: 648;"
  },
  "status": 400
}

插入 _id 是 270 個中文字符的數據

大部分中文字符，在 UTF-8 中用3個字節存儲。270個中文，510 字節。

POST student/_doc/零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九
{
  "name": "5555"
}

成功。

插入 _id 是 271 個中文字符的數據（會失敗）

271 個中文，對應 513 個字節。

POST student/_doc/零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零
{
  "name": "5555"
}

報錯信息如下：

{
  "error": {
    "root_cause": [
      {
        "type": "action_request_validation_exception",
        "reason": "Validation Failed: 1: id is too long, must be no longer than 512 bytes but was: 513;"
      }
    ],
    "type": "action_request_validation_exception",
    "reason": "Validation Failed: 1: id is too long, must be no longer than 512 bytes but was: 513;"
  },
  "status": 400
}

 

( 本文完 )

 

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轉載於：https://www.letianbiji.com/elasticsearch/es7-doc-id-limit.html