Help Center > > User Guide> Managing Active Clusters> Managing Jobs> Running a Flink Job

Running a Flink Job

Updated at: Apr 28, 2020 GMT+08:00

You can submit programs developed by yourself to MRS to execute them, and obtain the results. This section describes how to submit a Flink job on the MRS management console. Flink jobs are used to submit JAR programs to process streaming data.

Prerequisites

You have uploaded the program packages and data files required for running jobs to OBS or HDFS.

Submitting a Job on the GUI

  1. Log in to the MRS management console.
  2. Choose Clusters > Active Clusters, select a running cluster, and click its name to switch to the cluster details page.
  3. If Kerberos authentication is enabled for the cluster, perform the following steps. If Kerberos authentication is not enabled for the cluster, skip this step.

    In the Basic Information area on the Dashboard tab page, click on the right side of IAM User Sync to synchronize IAM users. For details, see Synchronizing IAM Users to MRS.

    • In MRS 2.0.1 or versions earlier than MRS 1.8.7, the job management function is unavailable in a cluster with Kerberos authentication enabled. You need to submit a job in the background.
    • When the policy of the user group to which the IAM user belongs changes from MRS ReadOnlyAccess to MRS CommonOperations, MRS FullAccess, or MRS Administrator, wait for 5 minutes until the new policy takes effect after the synchronization is complete because the sssd cache of cluster nodes needs time to be updated. Then, submit a job. Otherwise, the job may fail to be submitted.
    • When the policy of the user group to which the IAM user belongs changes from MRS CommonOperations, MRS FullAccess, or MRS Administrator to MRS ReadOnlyAccess, wait for 5 minutes until the new policy takes effect after the synchronization is complete because the sssd cache of cluster nodes needs time to be updated.

  4. Click the Jobs tab.
  5. Click Create. The Create Job page is displayed.
  6. Set Type to Flink. Configure Flink job information by referring to Table 1.

    Table 1 Job configuration information

    Parameter

    Description

    Name

    Job name. It contains 1 to 64 characters. Only letters, digits, hyphens (-), and underscores (_) are allowed.

    NOTE:

    You are advised to set different names for different jobs.

    Program Path

    Path of the program package to be executed. The following requirements must be met:

    • Contains a maximum of 1,023 characters, excluding special characters such as ;|&><'$. The parameter value cannot be empty or full of spaces.
    • The path of the program to be executed can be stored in HDFS or OBS. The path varies depending on the file system.
      • OBS: The path must start with s3a://. Example: s3a://wordcount/program/xxx.jar
      • OBS: The path must start with obs://. Example: obs://wordcount/program/xxx.jar (supported in MRS 2.1.0 or later)
      • HDFS: The path must start with /user.
    • For SparkScript, the path must end with .sql. For MapReduce and Spark, the path must end with .jar. The .sql and .jar are case-insensitive.
    NOTE:

    If you use an OBS path starting with s3a://, configure permission for accessing OBS by referring to Accessing OBS.

    If you use an OBS path starting with obs://, configure permission for accessing OBS as follows:
    • If the OBS permission control function is enabled during cluster creation, you can use the obs:// directory without extra configuration.
    • If the OBS permission control function is not enabled or not available during cluster creation, perform the following steps:
      1. On the cluster details page, click the Nodes tab and expand a node group.
      2. Click a node name to go to the cloud server console.
      3. Click on the right of Agency, select MRS_ECS_DEFAULT_AGENCY and add it.
      4. Repeat the preceding steps to add agencies for all nodes in the cluster.

    Program Parameter

    Used to configure optimization parameters such as threads, memory, and vCPUs for the job to optimize resource usage and improve job execution performance.

    Parameters

    Key parameter for program execution. The parameter is specified by the function of the user's program. MRS is only responsible for loading the parameter. Multiple parameters are separated by space.

    The parameter contains a maximum of 2,047 characters, excluding special characters such as ;|&><'$, and can be left blank.

    NOTE:

    When entering a parameter containing sensitive information (for example, login password), you can add an at sign (@) before the parameter name to encrypt the parameter value. This prevents the sensitive information from being persisted in plaintext. When you view job information on the MRS management console, the sensitive information is displayed as *.

    Example: username=admin @password=admin_123

    Service Parameter

    This parameter is optional. It is used to modify service parameters for the job. The parameter modification applies only to the current job. To make the modification take effect permanently for the cluster, follow instructions in Configuring Service Parameters.

    To add multiple parameters, click on the right. To delete a parameter, click Delete on the right.

    Command Reference

    Command submitted to the background for execution when a job is submitted

  7. Confirm job configuration information and click OK.

    After the job is created, you can manage it.

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