E-MapReduce:Manage parameters

Prerequisites

An existing cluster is required. See Create a cluster for instructions.

Configuration items

1. Log on to the E-MapReduce console.

2. In the top navigation bar, select a region and resource group based on your requirements.

3. On the EMR on ECS page, find the target cluster and click Services in the Actions column.

4. Find the target service and click Configure.

5. Use the search box to find a specific configuration item.

   Note

   • If a configuration item is modified at the node group level or node level, its value at that level overrides the cluster-level default. This overridden value is then displayed on the cluster-level configuration page.

   • To view configuration values at the node group or node level, select the desired node group or node.

   • Configuration values are applied at three levels. The override priority is as follows: node level > node group level > cluster level.

   By default, the Configure tab displays configuration items at the cluster level.

   To modify configuration items at the node group level or node level, select Node group level configuration or Node-level configuration from the Cluster-level configuration drop-down list, then modify and save the settings. To see which configuration items can be modified for specific nodes and node groups, see Modifiable configuration items.

   To compare configuration differences across all levels (cluster, node group, and node), click Switch to full configuration page.

Modify parameters

1. Go to the configuration page of a service.

   1. Log on to the E-MapReduce console.

   2. In the top navigation bar, select a region and a resource group as needed.

   3. On the EMR on ECS page, find the target cluster and click Services in the Actions column.

   4. Find the desired service and click Configure.

2. Modify the configuration.

   1. In the search box, enter the name of the desired configuration item.

   2. Find the desired configuration item and change its parameter value.

3. Save the configuration.

   1. On the Configure page, click Save.

   2. In the Save dialog box, enter an Execution Reason and click Save.

      Note

      In the Save dialog box, the Save and Deliver Configuration switch is on by default. With the switch enabled, configuration items are delivered to the client after saving. You can apply the changes in manual mode. If you turn off the Save and Deliver Configuration switch in the Save dialog box, you can apply the changes in prompt mode.

4. Apply the changes.

   To apply the changes, perform the following steps based on the type of configuration item you modified.

   Prompt mode

   Note

   This mode is available only for EMR-5.12.1 and later, and EMR-3.46.1 and later.

   • Client-side configurations

     1. After you save the configuration, a prompt appears.

     2. Click the To Be Delivered prompt.

     3. In the dialog box, click Deliver.

        Note

        For the YARN service, if the delivered configuration items include queue-related configuration items, you must also click Deploy or the prompt after the delivery to apply the changes.

   • Server-side configurations

     1. After you save the configuration, a prompt appears.

     2. Click the Not Effective Yet prompt.

     3. In the dialog box, apply the changes based on the required method.

        • Configurations That Require Custom Operations

          Manually click the action for each component.

        • Configurations That Require Restart

          1. Click Restart or batch.

          2. In the dialog box, enter an Execution Reason and click OK.

   Manual mode

   • Client-side configurations

     1. After you save the configuration, click Deploy Client Configuration next to the Save button.

     2. In the dialog box, enter an Execution Reason and click OK.

     3. In the Confirm dialog box, click OK.

   • Server-side configurations

     1. After you save the configuration, on the Configure page, choose More > Restart.

     2. In the dialog box, enter an Execution Reason and click OK.

     3. In the Confirm dialog box, click OK.

Add configuration items

1. Go to the configuration page of a service.

   1. Log on to the E-MapReduce console.

   2. In the top navigation bar, select a region and a resource group.

   3. On the EMR on ECS page, find your cluster and click Services in the Actions column.

   4. On the Services tab, find your service and click Configure.

2. Add configuration items.

   1. Click the tab where you want to add the configuration items.

   2. Click Add Configuration Item.

   3. Add the configuration items.

      You can add multiple configuration items at a time.

      Parameter	Description
      Key	The key for the configuration item.
      Value	The value for the configuration item.
      Description	The description for the configuration item.
      Actions	Allows you to delete the configuration item.

   4. After you add the configuration items, click OK.

   5. Enter an Execution Reason and click Save.

3. Apply the changes.

   To apply the changes, perform the following steps based on the type of configuration item you modified.

   Prompt mode

   Note

   This mode is available only for EMR-5.12.1 and later, and EMR-3.46.1 and later.

   • Client-side configurations

     1. After you save the configuration, a prompt appears.

     2. Click the To Be Delivered prompt.

     3. In the dialog box, click Deliver.

        Note

        For the YARN service, if the delivered configuration items include queue-related configuration items, you must also click Deploy or the prompt after the delivery to apply the changes.

   • Server-side configurations

     1. After you save the configuration, a prompt appears.

     2. Click the Not Effective Yet prompt.

     3. In the dialog box, apply the changes based on the required method.

        • Configurations That Require Custom Operations

          Manually click the action for each component.

        • Configurations That Require Restart

          1. Click Restart or batch.

          2. In the dialog box, enter an Execution Reason and click OK.

   Manual mode

   • Client-side configurations

     1. After you save the configuration, click Deploy Client Configuration next to the Save button.

     2. In the dialog box, enter an Execution Reason and click OK.

     3. In the Confirm dialog box, click OK.

   • Server-side configurations

     1. After you save the configuration, on the Configure page, choose More > Restart.

     2. In the dialog box, enter an Execution Reason and click OK.

     3. In the Confirm dialog box, click OK.

Node-level modifiable parameters

This topic uses EMR-5.17.1 as an example.