MaxCompute:Migrate data from Kafka to MaxCompute

Step 1: Prepare test data in the EMR Kafka cluster

You must prepare test data in the EMR Kafka cluster. To ensure that you can log on to the master node of the EMR Kafka cluster and that MaxCompute and DataWorks can communicate with the master node, you must configure a security group rule for the master node of the EMR Kafka cluster to allow requests on TCP ports 22 and 9092.

1. Log on to the master node of the EMR Kafka cluster.

   1. Log on to the EMR console.

   2. In the left-side navigation pane, click EMR on ECS.

   3. On the EMR on ECS page, find the cluster in which you want to prepare test data and click the name of the cluster in the Cluster ID/Name column.

   4. On the details page of the cluster, click the Nodes tab. On the Nodes tab, find the IP address of the master node and use the IP address to remotely log on to the master node in SSH mode.

2. Create a test topic.

   Run the following command to create a test topic named testkafka:

   kafka-topics.sh --zookeeper emr-header-1:2181/kafka-1.0.1 --partitions 10 --replication-factor 3 --topic testkafka  --create

3. Write test data to the test topic.

   Run the following command to simulate a producer to write data to the testkafka topic. Kafka is used to process streaming data. You can continuously write data to the topic in the Kafka cluster. To ensure that test results are valid, we recommend that you write more than 10 data records to the topic.

   kafka-console-producer.sh --broker-list emr-header-1:9092 --topic testkafka

   To simulate a consumer to check whether data is written to the topic in the Dataflow Kafka cluster, open another SSH window and run the following command. If the written data appears, the data is written to the topic.

   kafka-console-consumer.sh --bootstrap-server emr-header-1:9092 --topic testkafka --from-beginning

Step 2: Create a table in DataWorks

Create a table in DataWorks to receive data from the EMR Kafka cluster.

1. Go to the DataStudio page.

   1. Log on to the DataWorks console.

   2. In the left-side navigation pane, choose Data Modeling and Development > DataStudio.

   3. On the DataStudio page, select a workspace from the drop-down list and click Go to DataStudio.

2. Right-click workflow, Select new > MaxCompute > table.

3. In the Create Table dialog box, enter the name of the table that you want to create in the Name field and click Create.

   Note

   • The table name must start with a letter and cannot contain Chinese or special characters.

   • If multiple MaxCompute data sources are associated with DataStudio, you must select the MaxCompute data source that you want to use.

4. On the table editing page, click DDL Statement.

5. In the DDL dialog box, enter the following table creation statement and click Generate Table Schema.

   CREATE TABLE testkafka 
   (
    key             string,
    value           string,
    partition1      string,
    timestamp1      string,
    offset          string,
    t123            string,
    event_id        string,
    tag             string
   ) ;

   Each column in the table that is created by using the preceding statement corresponds to a column from which Kafka Reader reads data.

   • __key__: the key of a Kafka message.

   • __value__: the complete content of a Kafka message.

   • __partition__: the partition to which a Kafka message belongs.

   • __headers__: the header of a Kafka message.

   • __offset__: the offset of a Kafka message.

   • __timestamp__: the timestamp of a Kafka message.

   You can specify a custom column. For more information, see Kafka Reader.

6. Click commit to the production environment and confirm.

Step 3: Synchronize the data

1. Create an exclusive resource group for Data Integration.

   Kafka Reader cannot run on a shared resource group of DataWorks. You must use an exclusive resource group for Data Integration to synchronize the data. For more information about how to create an exclusive resource group for Data Integration, see Create and use an exclusive resource group for Data Integration.

2. Create a data synchronization task.

   1. Go to the DataStudio page. In the left-side navigation pane of the DataStudio page, click Scheduled Workflow, right-click the name of the desired workflow, and then choose Create Node > Data Integration > Offline synchronization.

   2. In the Create Node dialog box, configure the Name parameter and click Confirm.

3. In the top navigation bar, choose icon.

4. In script mode, click icon.

5. Configure the script. The following sample code provides an example of a script.

   {
       "type": "job",
       "steps": [
           {
               "stepType": "kafka",
               "parameter": {
                   "server": "47.xxx.xxx.xxx:9092",
                   "kafkaConfig": {
                       "group.id": "console-consumer-83505"
                   },
                   "valueType": "ByteArray",
                   "column": [
                       "__key__",
                       "__value__",
                       "__partition__",
                       "__timestamp__",
                       "__offset__",
                       "'123'",
                       "event_id",
                       "tag.desc"
                   ],
                   "topic": "testkafka",
                   "keyType": "ByteArray",
                   "waitTime": "10",
                   "beginOffset": "0",
                   "endOffset": "3"
               },
               "name": "Reader",
               "category": "reader"
           },
           {
               "stepType": "odps",
               "parameter": {
                   "partition": "",
                   "truncate": true,
                   "compress": false,
                   "datasource": "odps_source",// The name of the MaxCompute data source.
                   "column": [
                       "key",
                       "value",
                       "partition1",
                       "timestamp1",
                       "offset",
                       "t123",
                       "event_id",
                       "tag"
                   ],
                   "emptyAsNull": false,
                   "table": "testkafka"
               },
               "name": "Writer",
               "category": "writer"
           }
       ],
       "version": "2.0",
       "order": {
           "hops": [
               {
                   "from": "Reader",
                   "to": "Writer"
               }
           ]
       },
       "setting": {
           "errorLimit": {
               "record": ""
           },
           "speed": {
               "throttle": false,
               "concurrent": 1
           }
       }
   }

   To view the values of the group.id parameter and the names of consumer groups, run the kafka-consumer-groups.sh --bootstrap-server emr-header-1:9092 --list command on the master node of the EMR Kafka cluster.

   • Sample command:

     kafka-consumer-groups.sh  --bootstrap-server emr-header-1:9092  --list

   • Return value:

     _emr-client-metrics-handler-group
     console-consumer-69493
     console-consumer-83505
     console-consumer-21030
     console-consumer-45322
     console-consumer-14773

   This example uses console-consumer-83505 to demonstrate how to obtain the values of the beginOffset and endOffset parameters by running the kafka-consumer-groups.sh --bootstrap-server emr-header-1:9092 --describe --group console-consumer-83505 command.

   • Sample command:

     kafka-consumer-groups.sh --bootstrap-server emr-header-1:9092 --describe --group console-consumer-83505

   • Return value:

     TOPIC                          PARTITION  CURRENT-OFFSET  LOG-END-OFFSET  LAG        CONSUMER-ID                                       HOST                           CLIENT-ID
     testkafka                      6          0               0               0          -                                                 -                              -
     test                           6          3               3               0          -                                                 -                              -
     testkafka                      0          0               0               0          -                                                 -                              -
     testkafka                      1          1               1               0          -                                                 -                              -
     testkafka                      5          0               0               0          -                                                 -                              -

6. Configure a resource group for scheduling.

   1. In the right-side navigation pane of the task configuration tab, click the Properties tab.

   2. In the Resource Group section of the Properties tab, set the Resource Group parameter to the exclusive resource group for Data Integration that you created.

      Note

      If you want to periodically write Kafka data to MaxCompute, such as on an hourly basis, you can use the beginDateTime and endDateTime parameters to set the interval for data reading to 1 hour. Then, the task is scheduled to run once per hour. For more information, see Kafka Reader.

7. Click icon to run the code.

8. You can operation Log view the results.

What to do next

You can create a data development task and run SQL statements to check whether the data has been synchronized from ApsaraMQ for Kafka to the current table. In this example, the select * from testkafka statement is used.