Read transaction on the MD-SAL distributed datastore does not return the full data for the root node. For example, the following code

domDataBroker.newReadOnlyTransaction()
    .read(LogicalDatastoreType.CONFIGURATION, YangInstanceIdentifier.empty()).get()

only returns partial configuration data.

ClientBackedReadTransaction used for ClientBackedDataStore, selected for the tell-based protocol, does not gather data from all the shards like TransactionProxy for DistributedDataStore. Instead it returns data in the 'default' shard only.