Restart a service in E-MapReduce - E-MapReduce - Alibaba Cloud Documentation Center

Prerequisites

A cluster must already exist. For more information, see Create a cluster.

To minimize service disruption, perform a rolling restart. In a primary/secondary architecture, the secondary instance is restarted before the primary instance.
Restarting a service is different from restarting a cluster. E-MapReduce does not support cluster-level restarts.
To manually terminate a restart, go to the Operation History page and click Terminate in the Actions column. Terminating a restart may cause configuration inconsistencies in the node group.

Go to the Services page of your cluster.
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.
On the Services tab, find the target service and choose > Restart.

Alternatively, go to the Configure page of the service and choose More > Restart.

In the Restart Service dialog box, enter an execution reason and click OK.

Configure the following parameters as needed.

Parameter	Description
Rolling Execution	Enabled by default. The system performs the task in batches based on the Rolling Execution Interval, which specifies the interval between batches. Important If you disable Rolling Execution, all nodes are restarted simultaneously, which may cause service interruptions. Use this option with caution.
Failure Handling Policy	Proceed Upon Failure of Single Node: If the task fails on a node, the task continues on the remaining nodes. Stop Upon Failure of Single Node: If the task fails on a node, the entire task is terminated.
Execution Reason	The reason for the restart.

In the Confirm dialog box, verify the information and click OK.

The operation is successful message appears, and the system executes the task based on your settings.