Saving data to Yandex Managed Service for ClickHouse®

With Data Transfer, you can deliver data from a data stream Data Streams to Managed Service for ClickHouse®.

To transfer data:

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

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

Required paid resourcesRequired paid resources

The support cost includes:

• Managed Service for ClickHouse® cluster fee: Using computing resources allocated to hosts (including ZooKeeper hosts) and disk space (see Managed Service for ClickHouse® pricing).

• Fee for using public IP addresses if public access is enabled for cluster hosts (see Virtual Private Cloud pricing).

• Fee for the Managed Service for YDB database. The charge depends on the usage mode:

  • For the serverless mode, you pay for data operations and the amount of stored data.
  • For the dedicated instance mode, you pay for the use of computing resources, dedicated DBs, and disk space.

  Learn more about the Managed Service for YDB pricing plans.

• Data Streams fee. The fee depends on the pricing mode:

  • Based on allocated resources: You pay for the number of units of written data and resources allocated for data streaming.
  • Based on actual use:

    • If the DB operates in serverless mode, the data stream is charged under the YDB serverless mode pricing policy.

    • If the DB operates in dedicated instance mode, the data stream is not charged separately (you only pay for the DB, see the pricing policy).

  Learn more about the Data Streams pricing plans.

• Transfer fee: Using computing resources and the number of transferred data rows (see Data Transfer pricing).

Getting startedGetting started

Set up your infrastructure:

Set up a Data Streams-enabled streamSet up a Data Streams-enabled stream

1. Create a Data Streams data stream.
2. Send test data to the data stream. Use data from the vehicle sensors in JSON format as a message:

{
    "device_id":"iv9a94th6rzt********",
    "datetime":"2022-06-05 17:27:00",
    "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 Data Streams-enabled stream.
       • Service account: Select or create a service account with the yds.editor role.

     • Advanced settings:

       • Conversion rules: JSON.
       • Data scheme: You can specify a schema in two ways:

         • Field list.

           Set a list of topic fields manually:

           Name	Type	Key
           device_id	STRING	Yes
           datetime	DATETIME
           latitude	DOUBLE
           longitude	DOUBLE
           altitude	DOUBLE
           speed	DOUBLE
           battery_voltage	ANY
           cabin_temperature	DOUBLE
           fuel_level	ANY

         • JSON specification.

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

           json_schema.json

           [
               {
                   "name": "device_id",
                   "type": "string",
                   "key": true
               },
               {
                   "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 transfer:

   Manually

   Terraform

   1. Create a transfer of the Replication type that will use the created endpoints.
   2. Activate your transfer.

   1. In the data-transfer-yds-mch.tf file, specify these variables:

      • source_endpoint_id: ID of the source endpoint.
      • transfer_enabled: 1 to create a transfer.

   2. Make sure the Terraform configuration files are correct using this command:

      terraform validate
      

      If there are any errors in the configuration files, Terraform will point them out.

   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.

      Once created, your transfer will be activated automatically.

Test your transferTest your transfer

1. Wait until the transfer status switches to Replicating.

2. Send a new message to the data stream Data Streams:

   {
       "device_id":"rhibbh3y08qm********",
       "datetime":"2022-06-06 09:49:54",
       "latitude":55.71294467,
       "longitude":37.66542005,
       "altitude":429.13,
       "speed":55.5,
       "battery_voltage":null,
       "cabin_temperature":18,
       "fuel_level":32
   }
   

3. Make sure the data from the Data Streams stream has been moved to the Managed Service for ClickHouse® cluster database:

   1. Connect to the Managed Service for ClickHouse® target cluster.
   2. Check that the ClickHouse® database contains a table with the name of the created Data Streams data stream with the same columns as the data schema in the source endpoint and the sent test data.

Delete the resources you createdDelete the resources you created

Some resources are not free of charge. To avoid paying for them, delete the resources you no longer need:

1. Delete the transfer.

2. Delete the resources depending on how they were created:

   Manually

   Terraform

   • Delete the target endpoint.
   • Delete the Managed Service for YDB database.
   • Delete the Managed Service for ClickHouse® cluster.

   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.

3. Delete the source endpoint.

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