Help Center/ MapReduce Service/ User Guide (Kuala Lumpur Region)/ MRS Cluster Component Operation Gudie/ Using Hive/ Enabling the Function of Creating a Foreign Table in a Directory That Can Only Be Read
Updated on 2022-08-12 GMT+08:00
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Enabling the Function of Creating a Foreign Table in a Directory That Can Only Be Read

Scenario

This function is applicable to Hive and Spark2x for MRS 3.x or later, or Hive and Spark for versions earlier than MRS 3.x.

After this function is enabled, the user or user group that has the read and execute permissions on a directory can create foreign tables in the directory without checking whether the current user is the owner of the directory. In addition, the directory of a foreign table cannot be stored in the default directory \warehouse. In addition, do not change the permission of the directory during foreign table authorization.

After this function is enabled, the function of the foreign table changes greatly. Based on the actual application scenario, determine whether to enable this function.

Procedure

  1. The Hive service configuration page is displayed.

    • For versions earlier than MRS 3.x, click the cluster name. On the cluster details page that is displayed, choose Components > Hive > Service Configuration, and select All from the Basic drop-down list.

      If the Components tab is unavailable, complete IAM user synchronization first. (On the Dashboard page, click Synchronize on the right side of IAM User Sync to synchronize IAM users.)

    • For MRS 3.x or later, log in to FusionInsight Manager. For details, see Accessing FusionInsight Manager (MRS 3.x or Later). And choose Cluster > Name of the desired cluster > Services > Hive > Configurations > All Configurations.

  2. Choose HiveServer(Role) > Customization, add a customized parameter to the hive-site.xml parameter file, set Name to hive.restrict.create.grant.external.table, and set Value to true.
  3. Choose MetaStore(Role) > Customization, add a customized parameter to the hivemetastore-site.xml parameter file, set Name to hive.restrict.create.grant.external.table, and set Value to true. Restart all Hive instances after the modification.
  4. Determine whether to enable this function on the Spark/Spark2x client.

    • If yes, download and install the Spark/Spark2x client again.
    • If no, no further action is required.

Parent topic: Using Hive