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

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

To transfer data:

1. Prepare the source cluster.
2. Prepare and activate the transfer.
3. Test the transfer.

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

Getting startedGetting started

Prepare the data transfer infrastructure:

Prepare the test dataPrepare the test data

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

   curl --cacert ~/.opensearch/root.crt \
        --user <source_cluster_username>:<user_password_in_source_cluster> \
        --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_username>:<user_password_in_source_cluster> \
        --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_username>:<user_password_in_source_cluster> \
        --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_username>:<user_password_in_source_cluster> \
        --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. (Optional) 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'
   

Prepare and activate the transferPrepare and activate the transfer

1. Create a source endpoint for the Managed Service for OpenSearch cluster you created earlier with the following settings:

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

2. Create a target endpoint and a transfer:

   Manually

   Terraform

   1. Create a target endpoint:

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

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

   3. Activate the transfer.

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

      • source_endpoint_id: ID of the source endpoint.
      • transfer_enabled: 1 for creating a target endpoint and transfer.

   2. Check that 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 the command to view planned changes:

         terraform plan
         

         If the resource configuration descriptions are correct, the terminal will display a list of the resources to modify and their parameters. This is a test step. No resources are updated.

      2. If you are happy with the planned changes, apply them:

         1. Run the command:

            terraform apply
            

         2. Confirm the update of resources.

         3. Wait for the operation to complete.

      Once created, your transfer will be activated automatically.

Test the transferTest the transfer

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

2. Make sure the data from the source Managed Service for OpenSearch cluster has been moved to the Managed Service for ClickHouse® database:

   Yandex WebSQL

   CLI

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

   2. Make sure the database contains the people table with test data. To do this, run this query to the database 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. Make sure the database contains the people table with test data:

      SELECT * FROM people;
      

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 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.

      The connection to the Managed Service for ClickHouse® cluster database in Yandex WebSQL will be deleted automatically.

   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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