Database Manual / Sharding / Reference / Inconsistency Types

HiddenShardedCollection

Description描述

HiddenShardedCollection

A collection is registered in the config.collections cluster catalog under a non-existent database.在config.collections群集目录中不存在的数据库下注册了一个集合。

New in version 7.0.在版本7.0中新增。

Format格式

{
   type: "HiddenShardedCollection",
   description: "<string>",
   details: {
      namespace: "<string>",
      collection: "<object>",
   }
}

HiddenShardedCollection inconsistency documents contain the following fields:不一致文档包含以下字段：

Field字段Type类型Description描述
typestring字符串Type of inconsistency document. Returns a value of HiddenShardedCollection for this inconsistency type.不一致文档的类型。为此不一致类型返回HiddenShardedCollection的值。
descriptionstring字符串Describes the inconsistency found in the metadata.描述元数据中发现的不一致。
detailsdocument文档Document with additional information on where the inconsistency exists in the database and sharded cluster.包含数据库和分片集群中不一致位置的附加信息的文档。
details.namespacestring字符串Indicates the database and collection where the inconsistency exists.指示存在不一致的数据库和集合。
details.collectiondocument文档Information about the collection.关于集合的信息。

Example示例

Use the db.adminCommand() method to call the checkMetadataConsistency command:使用db.adminCommand()方法调用checkMetadataConsistency命令：

db.adminCommand( { checkMetadataConsistency: 1 } )

The method returns a cursor with a batch of documents showing the inconsistencies found in the sharding metadata. The example below shows a cursor with a HiddenShardedCollection inconsistency document:该方法返回一个游标，其中包含一批文档，显示分片元数据中发现的不一致。下面的示例显示了一个带有HiddenShardedCollection不一致文档的游标：

{
   cursor: {
      id: Long("0"),
      ns: "test.$cmd.aggregate",
      firstBatch: [
         {
            type: "HiddenShardedCollection",
            description: "Found sharded collection but relative database does not exist",
            details: {
               namespace: "test.authors",
               collection: {
                   _id: "test.authors",
                   lastmodEpoch: ObjectId("64ddd78de906038182671674"),
                   lastmod: ISODate("2023-08-17T08:17:17.944Z"),
                   timestamp: Timestamp(1692260237, 58),
                   uuid: new UUID("69317741-7bc5-4eca-8877-7858cecf67d6"),
                   key: {
                      "skey" : 1
                   },
                   unique: false,
                   noBalance: false
                }
            }
         }
      ],
   },
   ok: 1
}