Database Manual / Sharding / Reference / Inconsistency Types

MissingLocalCollection

Description描述

MissingLocalCollection

A collection is registered on the sharding catalog but does not exist on the corresponding shard.一个集合在分片目录上注册，但在相应的分片上不存在。

New in version 8.0.在版本8.0中新增。

Format格式

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

MissingLocalCollection inconsistency documents contain these 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 MissingLocalCollection for this inconsistency type.不一致文档的类型。为此不一致类型返回MissingLocalCollection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.uuidUUIDUUID of the collection registered on the sharding catalog.在分片目录上注册的集合的UUID。
details.shardstring字符串The shard where the inconsistency exists.存在不一致的分片。

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 MissingLocalCollection 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。下面的示例显示了带有MissingLocalCollection不一致文档的游标：

{
   cursor: {
      id: Long("0"),
      ns: "test.$cmd.aggregate",
      firstBatch: [
         {
            type: "MissingLocalCollection",
            description: "Collection registered on the sharding catalog not found on the given shards",
            details: {
               namespace: "test.authors",
               uuid: UUID("1ad56770-61e2-48e9-83c6-8ecefe73cfc4"),
               shard: "shard02"
            }
         }
      ],
   },
   ok: 1
}