Creating a FlinkServer Job

Scenario

Define Flink jobs, including Flink SQL and Flink JAR jobs.

Creating a Job

1. Access the Flink web UI. For details, see Accessing the FlinkServer Web UI.
2. Click Job Management. The job management page is displayed.
3. Click Create Job. Create a Flink SQL job or Flink Jar job, enter job information, and click OK. The job is created and the job development page is displayed.
4. (Optional) To develop a job immediately, configure the job on the job development page.
   • Creating a Flink SQL job
     1. Develop the job on the job development page.

        

     2. Click Check Semantic to check the input content and click Format SQL to format SQL statements.
     3. After the job SQL statements are developed, set basic and customized parameters as required by referring to Table 1 and click Save.

        Table 1 Basic parameters

        Parameter	Description
        Parallelism	Number of parallel jobs
        Maximum Operator Parallelism	Maximum degree of parallelism of operators
        JobManager Memory (MB)	Memory of JobManager The minimum value is 512.
        Submit Queue	Queue to which a job is submitted. If this parameter is not set, the default queue is used.
        taskManager	taskManager running parameters include: Slots: If this parameter is left blank, the default value 1 is used. Memory (MB): The minimum value is 512.
        Enable CheckPoint	Whether to enable CheckPoint. After CheckPoint is enabled, you need to configure the following information: Time Interval (ms): This parameter is mandatory. Mode: This parameter is mandatory. EXACTLY_ONCE: Data or events are processed by the operator only once. AT_LEAST_ONCE: Data or events are processed by the operator at least once. Minimum Interval (ms): The minimum value is 10. Timeout Duration: The minimum value is 10. Maximum Parallelism: The value must be a positive integer containing a maximum of 64 characters. Whether to clean up: This parameter can be set to Yes or No. Whether to enable incremental checkpoints: This parameter can be set to Yes or No.
        Failure Recovery Policy	Failure recovery policy of a job. The options are as follows. For details, see Configuring the FlinkServer Job Restart Policy. fixed-delay: You need to configure Retry Times and Retry Interval (s). failure-rate: You need to configure Max Retry Times, Interval (min), and Retry Interval (s). none

     4. Click Submit in the upper left corner to submit the job.
   • Creating a Flink JAR job
     1. Click Select to upload a local JAR file and set parameters by referring to Table 2 or add customized parameters.

        Table 2 Parameter configuration

        Parameter	Description
        Local .jar File	Upload a local JAR file. The size of the file cannot exceed 10 MB.
        Main Class	Main-Class type. Default: By default, the class name is specified based on the Mainfest file in the JAR file. Specify: Manually specify the class name.
        Type	Class name. This parameter is available when Main Class is set to Specify.
        Class Parameter	Class parameters of Main-Class (parameters are separated by spaces).
        Parallelism	Number of parallel jobs
        JobManager Memory (MB)	Memory of JobManager The minimum value is 512.
        Submit Queue	Queue to which a job is submitted. If this parameter is not set, the default queue is used.
        taskManager	taskManager running parameters include: Slots: If this parameter is left blank, the default value 1 is used. Memory (MB): The minimum value is 512.

     2. Click Save to save the configuration and click Submit to submit the job.

5. Return to the job management page. You can view information about the created job, including job name, type, status, kind, and description.

   After a job is created, you can start, develop, stop, edit, and delete the job, view job details, and rectify checkpoint faults in the Operation column of the job.

   

   • To read files related to the submitted job on the node as another user, ensure that the user and the user who submitted the job belong to the same user group and the user has been assigned the FlinkServer application management role. For example,application view is selected by referring to Creating a FlinkServer Role.
   • You can view details about jobs in the Running state.
   • You can rectify checkpoint faults for jobs in the Running failed, Running succeeded, or Stop state.