Delivering data from an Apache Kafka® queue to Greenplum®

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Updated at September 24, 2024

Getting started
Prepare the test data
Prepare and activate the transfer
Test the transfer
Delete the resources you created

You can set up data transfer from a Yandex Managed Service for Apache Kafka® topic to Yandex Managed Service for Greenplum® using Yandex Data Transfer. To do this:

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

Getting started

Prepare the infrastructure:
Manually

Terraform
1. Create a source Yandex Managed Service for Apache Kafka® cluster in any applicable configuration with publicly available hosts.
2. In the source cluster, create a topic named sensors.
3. In the source cluster, create a user named mkf-user with the ACCESS_ROLE_PRODUCER and ACCESS_ROLE_CONSUMER permissions for the created topic.
4. Create a target Yandex Managed Service for Greenplum® cluster with any appropriate configuration, using the admin username (user) and with hosts located in the public domain.
5. Make sure that the cluster security groups are set up correctly and allow connecting to them:
  - Managed Service for Apache Kafka®
  - Managed Service for Greenplum®
1. If you do not have Terraform yet, install it.
2. Get the authentication credentials. You can add them to environment variables or specify them later in the provider configuration file.
3. Configure and initialize a provider. There is no need to create a provider configuration file manually, you can download it.
4. Place the configuration file in a separate working directory and specify the parameter values. If you did not add the authentication credentials to environment variables, specify them in the configuration file.
5. Download the kafka-greenplum.tf configuration file to the same working directory.
  
  This file describes:
  - Networks and subnets for hosting the clusters.
  - Security groups for making cluster connections.
  - Managed Service for Apache Kafka® source cluster.
  - Managed Service for Greenplum® target cluster.
  - Transfer.
6. In the kafka-greenplum.tf file, specify the user passwords and versions of Apache Kafka® and Greenplum®.
7. 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.
8. 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:
    
    Run the command:
    
    terraform apply
    
    Confirm the update of resources.
    
    Wait for the operation to complete.
  All the required resources will be created in the specified folder. You can check resource availability and their settings in the management console.
Install the utilities:
- kafkacat to read and write data to Apache Kafka® topics.
```
sudo apt update && sudo apt install --yes kafkacat
```
  Check that you can use it to connect to the Managed Service for Apache Kafka® source cluster over SSL.
- jq for JSON file stream processing.
```
sudo apt update && sudo apt-get install --yes jq
```

Prepare the test data

Let's assume the Apache Kafka® sensors topic in the source cluster receives data from car sensors in JSON format.

Create a file named sample.json with test data on your running instance:

sample.json

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

Prepare and activate the transfer

Create a source endpoint with the Apache Kafka® type and specify the following items for it:

Topic full name: sensors.
json conversion rules. In the Data scheme field, select JSON specification and copy and paste the following field specification into the form that opens:

sensors-specification

[
    {
        "name": "device_id",
        "type": "utf8",
        "key": true
    },
    {
        "name": "datetime",
        "type": "utf8"
    },
    {
        "name": "latitude",
        "type": "double"
    },
    {
        "name": "longitude",
        "type": "double"
    },
    {
        "name": "altitude",
        "type": "double"
    },
    {
        "name": "speed",
        "type": "double"
    },
    {
        "name": "battery_voltage",
        "type": "double"
    },
    {
        "name": "cabin_temperature",
        "type": "uint16"
    },
    {
        "name": "fuel_level",
        "type": "uint16"
    }
]

Create a target endpoint of the Greenplum® type and specify user as the username.
Create and activate the transfer:
Manually

Terraform
1. Create a transfer of the Replication type that will use the created endpoints.
2. Activate the transfer and wait for its status to change to Replicating.
1. In kafka-greenplum.tf, specify the following variables:
  - kf_source_endpoint_id: ID of the source endpoint.
  - gp_target_endpoint_id: ID of the target endpoint.
  - transfer_enabled: Set to 1 to enable transfer creation.
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 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:
    
    Run the command:
    
    terraform apply
    
    Confirm the update of resources.
    
    Wait for the operation to complete.
4. The transfer will be activated automatically. Wait for its status to change to Replicating.

Test the transfer

Make sure the data from the topic in the source Managed Service for Apache Kafka® cluster is being moved to the Managed Service for Greenplum® database:

Send data from the sample.json file to the Managed Service for Apache Kafka® sensors topic using jq and kafkacat:

jq -rc . sample.json | kafkacat -P \
    -b <broker_host_FQDN>:9091 \
    -t sensors \
    -k key \
    -X security.protocol=SASL_SSL \
    -X sasl.mechanisms=SCRAM-SHA-512 \
    -X sasl.username="<username_in_the_source_cluster>" \
    -X sasl.password="<user_password_in_the_source_cluster>" \
    -X ssl.ca.location=/usr/local/share/ca-certificates/Yandex/YandexInternalRootCA.crt -Z

To learn more about setting up an SSL certificate and working with kafkacat, see Connecting to an Apache Kafka® cluster from applications.

Make sure the data from the source Managed Service for Apache Kafka® cluster has been moved to the Managed Service for Greenplum® database:
1. Connect to the Managed Service for Greenplum® database.
2. Check that the database contains the sensors table with the test data from the topic:
```
SELECT * FROM public.sensors;
```

Delete the resources you created

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

Make sure the transfer has the Completed status and delete it.
Delete both the source endpoint and the target endpoint.
Delete the clusters:
Manually

Terraform
- Managed Service for Apache Kafka®.
- Managed Service for Greenplum®.
If you created your resources using Terraform:
1. In the terminal window, go to the directory containing the infrastructure plan.
2. Delete the kafka-greenplum.tf configuration file.
3. 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.
4. Confirm updating the resources.
  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:
    
    Run the command:
    
    terraform apply
    
    Confirm the update of resources.
    
    Wait for the operation to complete.
  This will delete all the resources described in the kafka-greenplum.tf configuration file.

Delivering data from an Apache Kafka® queue to Greenplum®

Getting startedGetting started

Prepare the test dataPrepare the test data

Prepare and activate the transferPrepare and activate the transfer

Test the transferTest the transfer

Delete the resources you createdDelete the resources you created

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Getting started

Prepare the test data

Prepare and activate the transfer

Test the transfer

Delete the resources you created