After you modify the configuration items of a service, you must restart the service to make the configurations take effect. This topic describes how to restart a service in the E-MapReduce (EMR) console.


A cluster is created. For more information, see Create a cluster.


  • To minimize impacts on business operations, we recommend that you restart a service in rolling mode. For instances deployed in primary/secondary mode, restart the service on the secondary instance and then the service on the primary instance.
  • If you clear Rolling Execute, the service is restarted on all nodes at the same time. In this case, the service stops running during the restart. Proceed with caution.


  1. Go to the Cluster Overview page.
    1. Log on to the Alibaba Cloud EMR console.
    2. In the top navigation bar, select the region where your cluster resides and select a resource group based on your business requirements.
    3. Click the Cluster Management tab.
    4. On the Cluster Management page, find your cluster and click Details in the Actions column.
  2. In the left-side navigation pane of the page that appears, choose Cluster Service > HDFS.
    The HDFS service is used as an example in this topic.
  3. In the upper-right corner of the HDFS service page, choose Actions > Restart All Components.
  4. In the Cluster Activities dialog box, specify Description and click OK.
  5. In the Confirm message, click OK.