CollectionAuxiliaryMetadataMismatch

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Description
Format
Example

Description

CollectionAuxiliaryMetadataMismatch: A collection contains mismatching auxiliary metadata across different shards.
New in version 8.1.

Format

{
   type: "CollectionAuxiliaryMetadataMismatch",
   description: "<string>",
   details: {
      namespace: "<string>",
      collectionMetadata: <array>
   }
}

CollectionAuxiliaryMetadataMismatch inconsistency documents contain these fields:

Field	Type	Description
`type`	string	Type of inconsistency document. Returns a value of `CollectionAuxiliaryMetadataMismatch` for this inconsistency type.
`description`	string	Describes 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.collectionMetadata`	array	Lists the mismatching auxiliary metadata found per shard.

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 CollectionAuxiliaryMetadataMismatch inconsistency document:

{
   cursor: {
      id: Long("0"),
      ns: "test.$cmd.aggregate",
      firstBatch: [
         {
            type: "CollectionAuxiliaryMetadataMismatch",
            description: "Found collection with mismatching auxiliary metadata across shards and/or config server",
            details: {
               namespace: "test.authors",
               collectionMetadata: [
                  { "md": { "exampleField": 123 }, "shards": [ "shard0" ] },
                  { "md": { "exampleField": 321 }, "shards": [ "shard1" ] }
               ]
            }
         }
      ],
   },
   ok: 1
}

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Inconsistency Types

CollectionOptionsMismatch