E-MapReduce:View auto scaling activities

Prerequisites

• A DataLake cluster, a Dataflow cluster, an online analytical processing (OLAP) cluster, a DataServing cluster, or a custom cluster is created. For more information, see Create a cluster.

• An auto scaling rule is configured for your cluster.

Procedure

1. Go to the Auto Scaling tab.

   1. Log on to the EMR console. In the left-side navigation pane, click EMR on ECS.

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

   3. On the EMR on ECS page, find the desired cluster and click the name of the cluster in the Cluster ID/Name column.

   4. On the page that appears, click the Auto Scaling tab.

2. Click the Auto Scaling Activity Analysis subtab.

   • Data charts of auto scaling activities

     Chart name	Description
     Cluster Overview	Displays the hourly changes in the number of nodes and the number of cores within the specified time period.
     Instance Distribution of Payment	Displays the hourly changes in the number of pay-as-you-go instances, the number of preemptible instances, and the number of cores within the specified time period.
     Cluster Core Hour	Displays the hourly changes in the number of the cores of pay-as-you-go and preemptible instances within the specified time period.
     Scaling Overview	Displays the hourly changes in the number of nodes that are created and released by auto scaling within the specified time period.
     Scale Success/Failed Activities Count	Displays the hourly changes in the number of successful and failed auto scaling activities within the specified time period.
     Distribution of Reasons for Scale Failed Activities	Displays the proportion of causes of auto scaling failures within the specified time period.

   • Records of auto scaling activities

     You can query the records of auto scaling activities by rule name, node group ID, status, time range, and node name. The following table describes the statuses of auto scaling activities.

     Status	Description
     Running	The auto scaling activity is in progress.
     Successful	All nodes specified in the auto scaling rule are added or removed during the auto scaling activity.
     Failed	No nodes specified in the auto scaling rule are added to or removed from the cluster during the auto scaling activity.
     Partial Successful	During the auto scaling activity, some of the nodes specified in the auto scaling rule are added or removed. The other nodes fail to be added or removed because of an insufficient disk quota or insufficient Elastic Compute Service (ECS) resources.
     Request Denied	The auto scaling activity is rejected. If the number of nodes in the auto scaling group is greater than the upper limit or less than the lower limit, the auto scaling activity cannot be performed. If the previous auto scaling activity is not complete, the auto scaling rule cannot be triggered.

     Note

     The system periodically cleans up expired data. Records of auto scaling activities that are performed in the previous 60 days are displayed in the console.