You can learn about the E-MapReduce cluster information from the cluster list or cluster details.

Cluster list

The Cluster Management page, displays basic information about all of your clusters.

On the Cluster Management page, information of clusters are displayed as follows:
Cluster list
The items in the cluster list are as follows:
  • Cluster ID/Name: The ID and name of a cluster. Move your cursor over a cluster's name to modify it.
  • Cluster Type: The types include Hadoop, Druid, Data Science, and Kafka.
  • Status: The status of a cluster. For more information, see Cluster statuses. If a cluster experiences an abnormality, such as a creation failure, prompt information appears on the right. If you hover your cursor over it, you can view detailed error information. You can also sort the statuses by clicking Status.
  • Created At: Time at which a cluster was created.
  • Runtime: The time from the point of creation to the current time. Once the cluster is released, the timing is terminated.
  • Billing Method: The billing method of the cluster.
  • Actions: Operations that can be performed on clusters, including the following:
    • Monitoring: Monitors the CPU usage rate, memory capacity, and disk capacity of E-MapReduce clusters to help users monitor the running status of the cluster.
    • Manage: Enters the Clusters and Services panel.
    • View details: Enters the Cluster Overview panel and view detailed information after the cluster is created.
    • More:
      • Scale Up/Out: Expands the cluster.
      • Release: Releases a cluster. For more information, see Release a cluster.
      • Restart: Restarts a cluster.

Cluster details

Cluster details display detailed information about a cluster.

Detailed information is provided in the following areas: cluster, software, network, and host:
  • Cluster

    Cluster
    • Name: The name of a cluster.
    • ID: The instance ID of a cluster.
    • Region: The region where a cluster is located.
    • Start Time: The time at which a cluster is created.
    • Software Configuration: Software configurations.
    • I/O Optimization: Whether the I/O optimization setting is enabled.
    • High Availability: Whether high-availability clusters are enabled.
    • Security Mode: Software in clusters is started in Kerberos secure mode. For more information about Kerberos, see Introduction to Kerberos.
    • Billing Method: Cluster billing method.
    • Current Status: For more information, see Cluster statuses.
    • Runtime: The time from the point of creation to the current time.
    • Unified Metabases:Whether Unified Metabases is enabled.
    • Bootstrap: The names, paths, and parameters of all configured bootstrap actions are listed here.
    • ECS Role: When your program runs on an E-MapReduce compute node, you can access the related Alibaba Cloud services, such OSS, without an AccessKey. E-MapReduce automatically requests a temporary AccessKey to authorize this access. The permission control of this temporary AccessKey is controlled by this role.
  • Software

    Software
    • Main Version: The main version of E-MapReduce.
    • Cluster Type: The selected cluster type.
    • Software: All application programs installed are listed here with their versions, such as HDFS2.7.2, Hive 2.3.3, or Spark 2.3.1.
  • Network

    Network
    • Region ID: The region where a cluster is located, such as cn-hangzhou-b, which is the same as ECS.
    • Network Type: The network type of a cluster.
    • Security Group ID: The ID of the security group that a cluster joined.
    • VPC/VSwitch: The VPC and VSwitch IDs of a cluster.
  • Host
    • Master Instance Group (Master): Configurations of all master nodes.
      Host
      • Hosts: The number of current nodes. During the creation process, the number of current nodes is less than the number of nodes you applied for until the creation is complete.
      • CPU: The number of cores in a node's CPU.
      • Memory: Memory capacity of a node.
      • Data Disk Type: Data disk type and capacity of a node.
      • ECS ID: The ID of the ECS instances purchased.
        Master Instance Group
      • Status: Includes Creating, Normal, Expanding, and Released.
      • Public IP : The public IP of master nodes.
      • Intranet IP: The internal network IP of the machine that can be accessed by all nodes in the cluster.
      • Created At: The creation time of the ECS instance purchased.
    • Core Instance Group (Core) : Configurations of all core nodes.
      Core Instance Group
      • Hosts: The number of current nodes. This is the same as the number of the nodes you applied for.
      • CPU: The number of cores in a node's CPU.
      • Memory: Memory capacity of a node.
      • Data Disk Type: Data disk type and capacity of a node.
      • ECS ID: The ID of the ECS instances purchased.
        Core Instance Group List
      • Status: Includes Creating, Normal, Expanding, and Released.
      • Intranet IP: The internal network IP of the machine that can be accessed by all nodes in the cluster.
      • Created At: The creation time of the ECS instance purchased.