Copying data from Managed Service for OpenSearch to Managed Service for ClickHouse® using Yandex Data Transfer

Data Transfer enables you to transfer data from a Managed Service for OpenSearch source cluster to Managed Service for ClickHouse®.

To transfer data:

1. Prepare the source cluster.
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 OpenSearch cluster: Use of computing resources and storage size (see Managed Service for OpenSearch pricing).
• Managed Service for ClickHouse® cluster: Use of computing resources allocated to hosts, storage and backup size (see Managed Service for ClickHouse® pricing).
• Public IP addresses if public access is enabled for cluster hosts (see Virtual Private Cloud pricing).

Getting startedGetting started

Set up your data transfer infrastructure:

Prepare your test dataPrepare your test data

1. In the source cluster, create a test index named people and define its schema:

   curl --cacert ~/.opensearch/root.crt \
        --user <source_cluster_user_name>:<source_cluster_user_password> \
        --header 'Content-Type: application/json' \
        --request PUT 'https://<address_of_OpenSearch_host_with_DATA_role>:9200/people' && \
   curl --cacert ~/.opensearch/root.crt \
        --user <source_cluster_user_name>:<source_cluster_user_password> \
        --header 'Content-Type: application/json' \
        --request PUT 'https://<address_of_OpenSearch_host_with_DATA_role>:9200/people/_mapping?pretty' \
        --data'
        {
              "properties": {
                 "name": {"type": "text"},
                 "age": {"type": "integer"}
              }
        }
        '
   

2. Populate the test index with data:

   curl --cacert ~/.opensearch/root.crt \
        --user <source_cluster_user_name>:<source_cluster_user_password> \
        --header 'Content-Type: application/json' \
        --request POST 'https://<address_of_OpenSearch_host_with_DATA_role>:9200/people/_doc/?pretty' \
        --data'
        {
              "name": "Alice",
              "age": "30"
        }
        ' && \
   curl --cacert ~/.opensearch/root.crt \
        --user <source_cluster_user_name>:<source_cluster_user_password> \
        --header 'Content-Type: application/json' \
        --request POST 'https://<address_of_OpenSearch_host_with_DATA_role>:9200/people/_doc/?pretty' \
        --data'
        {
              "name": "Robert",
              "age": "32"
        }
        '
   

3. Optionally, check the data in the test index:

   curl --cacert ~/.opensearch/root.crt \
        --user <username_in_target_cluster>:<user_password_in_target_cluster> \
        --header 'Content-Type: application/json' \
        --request GET 'https://<address_of_OpenSearch_host_with_DATA_role>:9200/people/_search?pretty'
   

Set up and activate the transferSet up and activate the transfer

1. Create a source endpoint for your pre-configured Managed Service for OpenSearch cluster using the following settings:

   • Database type: OpenSearch.
   • Connection settings:
     • Connection type: Managed Service for OpenSearch cluster.
     • Managed Service for OpenSearch cluster: Select the Managed Service for OpenSearch cluster from the list.
     • User: admin.
     • Password: admin password.

2. Create a target endpoint and set up the transfer:

   Manually

   Terraform

   1. Create a target endpoint:

      • Database type: ClickHouse.
      • Endpoint parameters:
        • Connection type: Select Managed cluster.
        • Managed cluster: Select the Managed Service for ClickHouse® cluster from the list.
        • User: Enter the Managed Service for ClickHouse® cluster user name.
        • Password: Enter the Managed Service for ClickHouse® cluster user password.
        • Database: Enter the Managed Service for ClickHouse® cluster database name.

   2. Create a transfer of the Snapshot-type that will use the endpoints you created.

   3. Activate the transfer.

   1. In the opensearch-to-clickhouse.tf file, specify the following settings:

      • source_endpoint_id: Source endpoint ID.
      • transfer_enabled: Set to 1 for creating a target endpoint and transfer.

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

      terraform validate
      

      Terraform will show any errors found in your configuration 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.

      Once created, your transfer will be activated automatically.

Test your transferTest your transfer

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

2. Check that the data has been transferred from the source Managed Service for OpenSearch cluster to the Managed Service for ClickHouse® database:

   Yandex WebSQL

   CLI

   1. Create a connection to the database in the Managed Service for ClickHouse® cluster.

   2. Make sure the database contains the people table populated with test data by running the following query via the connection you created:

      SELECT * FROM people;
      

   1. Get an SSL certificate to connect to the Managed Service for ClickHouse® cluster.

   2. If you do not have clickhouse-client, install it.

   3. Connect to the database in the Managed Service for ClickHouse® cluster.

   4. Check that the database contains the people table populated with test data:

      SELECT * FROM people;
      

Delete the resources you createdDelete the resources you created

Some resources are not free of charge. Delete the resources you no longer need to avoid paying for them:

1. Delete the source endpoint.

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

   Manually

   Terraform

   1. Delete the transfer.

   2. Delete the target endpoint.

   3. Delete the Managed Service for OpenSearch cluster.

   4. Delete the Managed Service for ClickHouse® cluster.

      Yandex WebSQL will automatically delete the database connection in the Managed Service for ClickHouse® cluster.

   5. Delete the subnet.

   6. Delete the network.

   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.

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