Migrate consumer group metadata from a self-managed Apache Kafka cluster to Message Queue for Apache Kafka

This topic describes how to use the metadata migration tool provided by Message Queue for Apache Kafka to migrate consumer group metadata from a self-managed Apache Kafka cluster to a Message Queue for Apache Kafka instance.

1. Start the command-line tool.
2. Run the cd command to switch to the directory where the migration tool is located.
3. Create a configuration file named kafka.properties.
   The kafka.properties file is used to create an Apache Kafka consumer to retrieve consumer offsets from the self-managed Apache Kafka cluster. The configuration file contains the following content:

   ## The endpoint. 
   bootstrap.servers=localhost:9092
   
   ## The consumer group, which contains no consumer offsets so that consumption starts from the first message. 
   group.id=XXX
   
   ## You can skip the following configurations if security configurations are unavailable. 
   
   ## The Simple Authentication and Security Layer (SASL) mechanism. 
   #sasl.mechanism=PLAIN
   
   ## The access protocol. 
   #security.protocol=SASL_SSL
   
   ## The path of the root Secure Sockets Layer (SSL) certificate. 
   #ssl.truststore.location=/Users/***/Documents/code/aliware-kafka-demos/main/resources/kafka.client.truststore.jks
   
   ## The password of the root SSL certificate. 
   #ssl.truststore.password=***
   
   ## The path of the configuration file for SASL. 
   #java.security.auth.login.config=/Users/***/kafka-java-demo/vpc-ssl/src/main/resources/kafka_client_jaas.conf

4. Run the following command to check the consumer group metadata to be migrated:
   java -jar kafka-migration.jar ConsumerGroupMigrationFromTopic --propertiesPath /usr/local/kafka_2.12-2.4.0/config/kafka.properties --destAk <yourAccessKeyId> --destSk <yourAccessKeySecret> --destRegionId <yourRegionId> --destInstanceId <yourInstanceId>

   Parameter	Description
   propertiesPath	The path of the kafka.properties configuration file.
   destAk	The AccessKey ID of the Alibaba Cloud account to which the destination Message Queue for Apache Kafka instance belongs.
   destSk	The AccessKey secret of the Alibaba Cloud account to which the destination Message Queue for Apache Kafka instance belongs.
   destRegionId	The ID of the region where the destination Message Queue for Apache Kafka instance is located.
   destInstanceId	The ID of the destination Message Queue for Apache Kafka instance.

   The following code provides an example of the consumer group metadata to be checked:

   15:29:45 INFO - Will create consumer groups:[XXX, test-consumer-group]

5. Run the following command to commit the consumer group metadata to be migrated:
   java -jar kafka-migration.jar ConsumerGroupMigrationFromTopic --propertiesPath /usr/local/kafka_2.12-2.4.0/config/kafka.properties --destAk LTAI4FwQ5aK1mFYCspJ1h*** --destSk wvDxjjRQ1tHPiL0oj7Y2Z7WDNkS*** --destRegionId cn-hangzhou --destInstanceId alikafka_pre-cn-v0h1cng00*** --commit

   Parameter	Description
   commit	Commits the consumer group metadata to be migrated.

   The following code provides an example of the output generated after the consumer group metadata to be migrated is committed:

   15:35:51 INFO - cmd=ConsumerGroupMigrationFromTopic, request=null, response={"code":200,"requestId":"C9797848-FD4C-411F-966D-0D4AB5D12F55","success":true,"message":"operation success"}
   15:35:51 INFO - ConsumerCreate success, consumer group=XXX
   15:35:57 INFO - cmd=ConsumerGroupMigrationFromTopic, request=null, response={"code":200,"requestId":"3BCFDBF2-3CD9-4D48-92C3-385C8DBB9709","success":true,"message":"operation success"}
   15:35:57 INFO - ConsumerCreate success, consumer group=test-consumer-group

6. Check whether the required consumer group is migrated.
   1. Log on to the Message Queue for Apache Kafka console.
   2. In the Resource Distribution section of the Overview page, select the region where your instance resides.
   3. On the Instances page, click the name of the instance that you want to manage.
   4. In the left-side navigation pane, click Groups.
   5. On the Groups page, check whether the required consumer group is displayed.