HiddenShardedCollection
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Description
HiddenShardedCollection
A collection is registered in the
config.collections
cluster catalog under a non-existent database.New in version 7.0.
Format
{ type: "HiddenShardedCollection", description: "<string>", details: { namespace: "<string>", collection: "<object>", } }
HiddenShardedCollection
inconsistency documents contain the following fields:
Field | Type | Description |
---|---|---|
type | string | Type of inconsistency document. Returns a value of |
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.collection | document | Information about the 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 HiddenShardedCollection
inconsistency document:
{ cursor: { id: Long("0"), ns: "test.$cmd.aggregate", firstBatch: [ { type: "HiddenShardedCollection", description: "Found sharded collection but relative database does not exist", details: { namespace: "test.authors", collection: { _id: "test.authors", lastmodEpoch: ObjectId("64ddd78de906038182671674"), lastmod: ISODate("2023-08-17T08:17:17.944Z"), timestamp: Timestamp(1692260237, 58), uuid: new UUID("69317741-7bc5-4eca-8877-7858cecf67d6"), key: { "skey" : 1 }, unique: false, noBalance: false } } } ], }, ok: 1 }