This topic describes the clusters in a cluster list, the cluster information contained in the cluster details, and supported cluster operations.

Prerequisites

An E-MapReduce (EMR) cluster is created. For more information, see Create a cluster.

Cluster Management tab

  1. Log on to the Alibaba Cloud E-MapReduce console.
  2. In the top navigation bar, select the region where you want to create a cluster. The region of a cluster cannot be changed after the cluster is created.
  3. Click the Cluster Management tab.

    The Cluster Management tab displays basic information about all of your clusters and the operations supported by each cluster.

    Cluster Management tab
    Parameter Description
    Cluster ID/Name The ID and name of the cluster.
    Cluster Type The type of the cluster.
    Status The status of the cluster. For more information, see Status list.

    If a cluster experiences an exception, such as a creation failure, prompt information appears on the right. You can move the pointer over the prompt information to view detailed error information. You can also sort clusters by Status.

    Created At/Time Elapsed
    • Created At: the time the cluster was created.
    • Time Elapsed: the running time of the cluster from its creation to the current time. The time terminates after the created cluster is released.
    Billing Method The billing method of the cluster.
    Actions The operations supported on the cluster include:
    • Monitor: views the overview information about the cluster on the Cluster Overview page.
      Note EMR-APM is available only in the following regions: China (Hangzhou), China (Shanghai), China (Beijing), China (Zhangjiakou-Beijing Winter Olympics), China (Shenzhen), and US (Virginia). If you require EMR-APM in other regions, submit a ticket and contact the EMR product team.
    • Details: views detailed information about the cluster on the Cluster Overview page.
    • More
      • CloudMonitor: monitors the CPU idleness, memory capacity, and disk capacity of the EMR cluster to help users monitor the running status of the cluster.
      • Scale Out: scales out the cluster. For more information, see Expand a cluster.
      • Release: releases the cluster. For more information, see Release a cluster.
      • Restart: restarts the cluster.

View cluster details

  1. Log on to the Alibaba Cloud E-MapReduce console.
  2. Click the Cluster Management tab.
  3. Find the target cluster and click Details in the Actions column.

    The Cluster Overview page displays detailed information about your cluster and includes four sections: Cluster Info, Software Info, Network Info, and Instance Info.

    • Cluster Info section
      Parameter Description
      Cluster Name The name of the cluster.
      Cluster ID The ID of the cluster.
      Region The region where the cluster resides.
      Status The status of the cluster. For more information, see Status list.
      Tag The cluster tag. For more information, see Cluster tags.
      I/O Optimization Specifies whether I/O optimization is enabled.
      High Availability Specifies whether high availability is enabled.
      Security Mode The security mode. The software of the cluster starts in Kerberos security mode. For more information, see Introduction to Kerberos.
      Start Time The time the cluster was created.
      Billing Method The billing method of the cluster.
      Time Elapsed The running time of the cluster.
      Unified Metabases Specifies whether the unified metadatabase is enabled.
      Bootstrap Actions/EMR Version Information about custom scripts and software configuration.
      ECS Role The ECS application role.

      You can also assign an application role to a cluster, so EMR applies for a temporary AccessKey pair when applications running on the compute nodes of that cluster access other Alibaba Cloud services, such as OSS. This way, you do not need to manually enter an AccessKey pair. You can grant the application role access permissions on specific Alibaba Cloud services as required.

    • Software Info sectionSoftware Info section
      Parameter Description
      EMR Version The major version of EMR.
      Cluster Type The type of the cluster.
      Software Info All user-installed applications and their versions, such as HDFS 2.7.2, Hive 2.3.3, and Spark 2.3.1.
    • Network Info sectionNetwork Info section
      Parameter Description
      Zone ID The zone where the cluster resides, such as cn-hangzhou-b, which is also the zone where the ECS instance resides.
      Network Type The network type of the cluster.
      Security Group ID The ID of the security group to which you want to add your cluster.
      VPC/VSwitch The ID of the VPC to which your cluster belongs and the ID of the subnet VSwitch.
    • Instance Info sectionInstance Info section
      Parameter Description
      Instances The current number of nodes and the actual number of nodes for which you applied. Theoretically, the two values must be the same. However, the current number is less than the actual number until creation is complete.
      CPU The number of CPU cores of a single node.
      Memory The memory capacity of a single node.
      Data Disk Type The data disk type and data disk capacity of a single node.
      ECS instance list The information about ECS instances in a master node group, including:
      • ECS ID: the ID of the purchased ECS instance
      • Deployment Status: including Initializing, Normal, and Scaling out
      • Public Network IP: the public IP address of the ECS instance
      • Internal Network IP: the private IP address of the ECS instance, which can be accessed by all nodes in the cluster
      • Created At: the creation time of the purchased ECS instance