Database Manual / Sharding / Reference / Inconsistency Types

CollectionOptionsMismatch

Description

CollectionOptionsMismatch

A collection contains mismatching options across different shards.

New in version 8.0: (Also available starting in 7.0.23)

Format

{
   type: "CollectionOptionsMismatch",
   description: "<string>",
   details: {
      namespace: "<string>",
      options: <array>
   }
}

CollectionOptionsMismatch inconsistency documents contain these fields:

FieldTypeDescription

type

string

Type of inconsistency document. Returns a value of CollectionOptionsMismatch 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.options

array

Lists the mismatching options found per shard or config server.

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 CollectionOptionsMismatch inconsistency document:

{
   cursor: {
      id: Long("0"),
      ns: "test.$cmd.aggregate",
      firstBatch: [
         {
            type: "CollectionOptionsMismatch",
            description: "Found collection with mismatching options across shards and/or config server",
            details: {
               namespace: "test.authors",
               options: [
                  { "options": { "capped": true }, "shards": [ "shard0" ] },
                  { "options": { "capped": false }, "shards": [ "shard1", "config" ] }
               ]
            }
         }
      ],
   },
   ok: 1
}