Database Manual / Sharding / Reference / Inconsistency Types

InconsistentIndex

Description

InconsistentIndex

An index exists on two different shards that contains differing metadata or a specific index is missing on some shards.

New in version 7.0.

Format

{
   type: "InconsistentIndex",
   description: "<string>",
   details: {
      namespace: "<string>",
      info: <document>
   }
}

InconsistentIndex inconsistency documents contain the following fields:

FieldTypeDescription

type

string

Type of inconsistency document. Returns a value of InconsistentIndex 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.info

document

Information on the inconsistent index.

Example

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

db.adminCommand( {
   checkMetadataConsistency: 1,
   checkIndexes: true
} )

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 InconsistentIndex inconsistency document:

{
   cursor: {
      id: Long("0"),
      ns: "test.$cmd.aggregate",
      firstBatch: [
         {
            type: "InconsistentIndex",
            description: "Found an index of a sharded collection that is inconsistent between different shards",
            details: {
               namespace: "test.authors",
               info: {
                   missingFromShards: [
                      "shard-rs1"
                   ],
                   inconsistentProperties: [ ],
                   indexName: "index1"
               }
            }
         }
      ],
   },
   ok: 1
}