Before using YI-MapReduce, you need to read and understand the following usage rules carefully.
1. Clusters must be created within a VPC subnet.
2. When creating a cluster, select an existing security group from the dropdown box. After the cluster is created, do not delete or change the used security group unless necessary, as this may cause cluster exceptions and affect its usage.
a. Do not grant unnecessary permissions of the security group used by the cluster to avoid malicious access.
b. When creating a security group, the ports in the outbound and inbound direction rules need to be opened, and the authorization policy cannot be set to "Reject", otherwise the cluster deployment and service startup may be affected.
3. When deploying Hive/Ranger components, the database configured with metadata and the cluster need to be under the same VPC, and should be connected through an Intranet IP address.
4. Please plan the disk of the cluster nodes according to business needs. If you need to store a large amount of business data, increase the number of EVS or storage space to prevent insufficient storage space from affecting the normal operation of nodes.
5. Cluster nodes are only used to run the YI-MapReduce cluster. It is recommended to deploy other client applications and user business programs on separate ECS.