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Inconsistency Types

New in version 7.0.

The checkMetadataConsistency command performs a series of consistency checks on sharding metadata and indexes and returns an array of inconsistency documents.

Inconsistency Type
Description

A collection contains mismatching options across different shards.

New in version 8.0.

A collection exists on a shard with a locally registered UUID that differs from the one registered in the config.collections cluster catalog.

New in version 7.0.

The routing table contains a chunk with a min key or max key that doesn't correspond to the collection shard key.

New in version 7.0.

The routing table contains a zone with a min key or max key that doesn't correspond to the collection shard key.

New in version 7.0.

A collection is registered in the config.collections cluster catalog under a non-existent database.

New in version 7.0.

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.

Indicates that an unsharded collection exists on the incorrect shard and was not moved with moveCollection.

New in version 7.0.

Changed in version 8.0.

A collection is registered on the sharding catalog but does not exist on the corresponding shard.

New in version 8.0.

A sharded collection exists without a routing table.

New in version 7.0.

A sharded collection exists that doesn't have an index compatible with the collection shard key.

New in version 7.0.

A range gap exists in the routing table. The last chunk boundary in the routing table does not reach the maximum key value.

New in version 7.0.

A range gap exists in the routing table. The first chunk does not start from the minimum key value.

New in version 7.0.

A range gap exists in the routing table between two consecutive chunks for the same collection.

New in version 7.0.

The routing table of a collection contains two chunks with overlapping shard key ranges.

New in version 7.0.

A shard is missing routing information for a collection.

New in version 8.0.

An unsharded collection has an invalid shard key.

New in version 8.0.

An unsharded collection contains multiple chunks.

New in version 8.0.

Overlapping zones exist for the same collection.

New in version 7.0.

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