In MongoDB 5.0 we will release a new collection type, "timeseries", this new collection type will create a view and an underlying system collection; __ mydb.system.buckets.X

Currently, mongodump & mongorestore will ignore system.* collections which is problematic for the new timeseries collections which utilizes and stores its data in a system.* collection.

There are a few options we should consider when investigating how tools can support timeseries collections: 

Option 1: 

Mongodump should dump the view for the underlying timeseries collection and not dump the underlying bucket collection. 

Benefits 

• Returns users data in expected format, logical documents 
• Allows mongodump to be agnostic to implementation details of the system collection if we ever decide to change the storage format

Considerations 

• Oplog entries are over the mydb.system.buckets.X collection and not the view 
• Can mongodump use the output of listCollections to recreate the time series collection 

Option 2: 

Mongodump should allow for system.bucket collections to be dumped and restored 

Benefits 

• Smaller effort required 

Considerations 

• Mongodump needs to be aware of the mydb.system.buckets.X collection and may create a dependency chain between tools and the server if we change the storage solution