Sharding: Unsupported Features

• A sharded RavenDB database generally provides the same services that a non-sharded database offers, so clients of older versions and non-sharded database are supported and existing queries, subscriptions, patches, and so on, require no modification.

• Find below a list of yet unimplemented features, that are currently supported by non-sharded RavenDB databases but not by sharded ones.

• In this page:

  • Unsupported Features
    • Unsupported Indexing Features
    • Unsupported Querying Features
    • Unsupported Document Extensions Features
    • Unsupported Backup Features
    • Unsupported Import & Export Features
    • Unsupported Migration Features
    • Unsupported Data Subscription Features
    • Unsupported Integrations Features
    • Unsupported Patching Features
    • Unsupported Replication Features

Unsupported Features

Unsupported Indexing Features

Unsupported Feature	Comment
Rolling index deployment
Load Document from another shard	Loading a document during indexing is possible only if the document resides on the shard.
Map-Reduce Output Documents	Using OutputReduceToCollection to output the results of a map-reduce index to a collection is not supported in a Sharded Database.
Custom Sorters

Unsupported Querying Features

Unsupported Feature	Comment
Load Document from another shard	An index or a query can only load a document if it resides on the same shard.
Load Document within a map-reduce projection
Stream Map-Reduce results	Streaming map-reduce results is not supported in a Sharded Database.
Stream Includes and Loads	Streaming Includes and Loads is not supported in a Sharded Database.
Use limit with PatchByQueryOperation or DeleteByQueryOperation	Unsupported Querying Features
MoreLikeThis
OrderByScore
OrderByDistance	Not supported in spatial map reduce indexes
Highlighting
Intersection

Unsupported Document Extensions Features

Unsupported Feature	Comment
Move Attachments	E.g. session.Advanced.Attachments.Move("users/1","foo","users/2","bar"); is not supported.
Copy Attachments	E.g. session.Advanced.Attachments.Copy("users/1","foo","users/2","bar"); is not supported.
Get multiple Attachments	E.g. session.Advanced.Attachments.Get(attachmentNames) is not supported.
Copy Time Series	E.g. session.Advanced.Defer(new CopyTimeSeriesCommandData(id, "Count", id2, "Count")); is not supported.

Unsupported Backup Features

Unsupported Feature	Comment
Create a Snapshot Backup
Restore from a Snapshot Backup

Unsupported Import & Export Features

Unsupported Feature	Comment
Import from a CSV file
Import from an S3 Bucket	using GET, Studio, smuggler, import s3 dir
Import from SQL
Import from Other Databases	Importing from databases like MongoDB and CosmosDB is not supported

Unsupported Migration Features

Unsupported Feature	Comment
Migrate from RavenDB	By POST, Studio, smuggler
Migrate from SQL DB

Unsupported Data Subscription Features

Unsupported Feature	Comment
Concurrent Subscriptions
Data Subscriptions Revisions Support	Subscribing to document revisions
SubscriptionCreationOptions.ChangeVector	Providing a change vector to start the processing from is not supported except for these special cases: "LastDocument", "BeginningOfTime", "DoNotChange"

Unsupported Integrations Features

Unsupported Feature	Comment
PostgreSQL
Queue ETL	Kafka ETL, RabbitMQ ETL
Queue Sink	Kafka Queue Sink, RabbitMQ Queue Sink

Unsupported Patching Features

Unsupported Feature	Comment
JSON patch

Unsupported Replication Features

Unsupported Feature	Comment
Filtered Replication
Hub/Sink Replication
Legacy replication	From RavenDB 3.x instances