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MisplacedCollection

Description

MisplacedCollection: Indicates that an unsharded collection exists on a shard that is not the primary shard.
New in version 7.0.

Format

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

MisplacedCollection inconsistency documents contain the following fields:

Field	Type	Description
`type`	string	Type of inconsistency document. Returns a value of `MisplacedCollection` for this inconsistency type.
`description`	string	Describes the nature of the inconsistency found in the metadata.
`details`	document	Document with additional information on where the inconsistency exists in the database and sharded cluster.
`details.namespace`	string	Indicates the database and collection where the inconsistency exists.
`details.shard`	string	The shard where the inconsistency exists.
`details.localUUID`	UUID	The local UUID of the misplaced collection.

Example

Use the db.adminCommand() method to call the checkMetadataConsistency command:

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:

{
   cursor: {
      id: Long("0"),
      ns: "test.$cmd.aggregate",
      firstBatch: [
         {
            type: "MisplacedCollection",
            description: "Unsharded collection found on shard different from database primary shard",
            details: {
               namespace: "test.authors",
               shard: "shard02",
               localUUID: new UUID("1ad56770-61e2-48e9-83c6-8ecefe73cfc4")
            }
         }
      ],
   },
   ok: 1
}

Back

InconsistentIndex

MissingRoutingTable