Database Manual / Sharding / Reference / Inconsistency Types

MisplacedCollection

Description描述

MisplacedCollection

Indicates that an unsharded collection exists on the incorrect shard and was not moved with moveCollection.表示不正确的分片上存在未分片的集合，并且该集合未使用moveCollection移动。

New in version 7.0.在版本7.0中新增。

Changed in version 8.0.在版本8.0中的更改。

Format格式

{
   type: "MisplacedCollection",
   description: "<string>",
   details: {
      namespace: "<string>",
      shard: "<string>",
      localUUID: UUID("<uuid>")
   }
}

MisplacedCollection 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 MisplacedCollection for this inconsistency type.不一致文档的类型。返回此不一致类型的MisplacedCollection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.shardstring字符串The shard where the inconsistency exists.存在不一致的分片。
details.localUUIDUUIDThe local UUID of the misplaced collection.放错位置的集合的本地UUID。

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 MisplacedCollection 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MisplacedCollection不一致文档的游标：

{
   cursor: {
      id: Long("0"),
      ns: "test.$cmd.aggregate",
      firstBatch: [
         {
            type: "MisplacedCollection",
            description: "Found unsharded collection without the appropriate metadata on a shard different from the database primary shard",
            details: {
               namespace: "test.authors",
               shard: "shard02",
               localUUID: new UUID("1ad56770-61e2-48e9-83c6-8ecefe73cfc4")
            }
         }
      ],
   },
   ok: 1
}