Migrating data from Yandex Data Streams using Yandex Data Transfer

With Data Transfer, you can transfer data from a stream in Data Streams to an Yandex Object Storage bucket.

1. Set up a data stream in Data Streams.
2. Set up and activate the transfer.
3. Test your transfer.

If you no longer need the resources you created, delete them.

Required paid resourcesRequired paid resources

• Managed Service for YDB database (see Managed Service for YDB pricing). The cost depends on deployment mode:

  • In serverless mode, you pay for data operations and storage volume, including stored backups.
  • In dedicated instance mode, you pay for the use of computing resources allocated to the database, storage size, and backups.

• Data Streams (see Data Streams pricing). The cost depends on the pricing model:

  • Based on allocated resources: You pay a fixed hourly rate for the established throughput limit and message retention period, and additionally for the number of units of actually written data.
  • On-demand: You pay for the performed read/write operations, the amount of read or written data, and the actual storage used for messages that are still within their retention period.

• Object Storage bucket: Use of storage, data operations (see Object Storage pricing).

Getting startedGetting started

Set up the infrastructure:

Set up a data stream in Data StreamsSet up a data stream in Data Streams

1. Create a data stream in Data Streams.

2. Send test data to this stream. Use the vehicle sensor data in JSON format as the message:

{
    "device_id":"iv9a94th6rzt********",
    "datetime":"2020-06-05T17:27:00",
    "latitude":"55.70329032",
    "longitude":"37.65472196",
    "altitude":"427.5",
    "speed":"0",
    "battery_voltage":"23.5",
    "cabin_temperature":"17",
    "fuel_level":null
}

Set up and activate the transferSet up and activate the transfer

1. Create a source endpoint:

   • Database type: Yandex Data Streams.

   • Endpoint settings:

     • Connection settings:

       • Database: Select the Managed Service for YDB database from the list.
       • Stream: Specify the name of the stream in Data Streams.
       • Service account: Select or create a service account with the yds.editor role.

     • Advanced settings:

       • Conversion rules: JSON.

       • Data scheme: JSON specification:

         Create and upload a data schema file in JSON format, json_schema.json:

         json_schema.json

         [
             {
                 "name": "device_id",
                 "type": "string"
             },
             {
                 "name": "datetime",
                 "type": "datetime"
             },
             {
                 "name": "latitude",
                 "type": "double"
             },
             {
                 "name": "longitude",
                 "type": "double"
             },
             {
                 "name": "altitude",
                 "type": "double"
             },
             {
                 "name": "speed",
                 "type": "double"
             },
             {
                 "name": "battery_voltage",
                 "type": "any"
             },
             {
                 "name": "cabin_temperature",
                 "type": "double"
             },
             {
                 "name": "fuel_level",
                 "type": "any"
             }
         ]
         

2. Create a target endpoint:

   • Database type: Object Storage.

   • Endpoint settings:

     • Connection settings:

       • Bucket: Enter the Object Storage bucket name.
       • Service account: Select or create a service account with the storage.uploader role.

     • Serialization format: Select JSON or CSV if you have enabled Conversion rules in the advanced settings for the source endpoint.

3. Create a transfer:

   Manually

   Terraform

   1. Create a Replication-type transfer configured to use the new endpoints.
   2. Activate the transfer.

   1. In the data-transfer-yds-obj.tf file, uncomment the following:

      • Variables:

        • source_endpoint_id, and set it to the source endpoint ID.
        • target_endpoint_id, and set it to the target endpoint ID.

      • yandex_datatransfer_transfer resource.

   2. Validate your Terraform configuration files using this command:

      terraform validate
      

      Terraform will display any configuration errors detected in your files.

   3. Create the required infrastructure:

      1. Run this command to view the planned changes:

         terraform plan
         

         If you described the configuration correctly, the terminal will display a list of the resources to update and their parameters. This is a verification step that does not apply changes to your resources.

      2. If everything looks correct, apply the changes:

         1. Run this command:

            terraform apply
            

         2. Confirm updating the resources.

         3. Wait for the operation to complete.

      The transfer will activate automatically upon creation.

Test the transferTest the transfer

1. Wait for the transfer status to change to Replicating.

2. Make sure the data from the stream in Data Streams has moved to the Object Storage bucket:

   1. In the management console, select the folder with the bucket.
   2. In the list of services, select Object Storage.
   3. Select the bucket from the list.
   4. Make sure the bucket contains the <stream_name>_0.raw file (.json or .csv, depending on the selected output format) with the test data.

3. Send a new message to your stream in Data Streams:

   {
       "device_id": "rhibbh3y08qm********",
       "datetime": "2020-06-06 09:49:54",
       "latitude": 55.71294467,
       "longitude": 37.66542005,
       "altitude": 429.13,
       "speed": 55.5,
       "battery_voltage": null,
       "cabin_temperature": 18,
       "fuel_level": 32
   }
   

4. Make sure the Object Storage bucket contains the new data:

   1. In the management console, select the folder with the bucket.
   2. In the list of services, select Object Storage.
   3. Select the bucket from the list.
   4. Make sure the bucket now contains the <stream_name>_0-1_1.raw file (.json or .csv, depending on the selected output format) with the new data.

Delete the resources you createdDelete the resources you created

To reduce the consumption of resources you do not need, delete them:

1. Delete the transfer.

2. Delete the source and target endpoints.

3. Delete the objects from the Object Storage bucket:

4. Delete the other resources depending on how you created them:

   Manually

   Terraform

   1. Delete the Managed Service for YDB database.
   2. Delete the bucket in Object Storage.
   3. If you created any service accounts when setting up your endpoints, delete them.

   1. In the terminal window, go to the directory containing the infrastructure plan.

      Warning

      Make sure the directory has no Terraform manifests with the resources you want to keep. Terraform deletes all resources that were created using the manifests in the current directory.

   2. Delete resources:

      1. Run this command:

         terraform destroy
         

      2. Confirm deleting the resources and wait for the operation to complete.

      All the resources described in the Terraform manifests will be deleted.