关于AWS EFS多Hadoop集群访问及外部API调用的技术咨询

Hey there! Let's break down your questions about AWS EFS and Hadoop clusters one by one:

Can multiple Hadoop clusters access AWS EFS? #

Absolutely! AWS EFS is built specifically as a multi-client, network-attached shared storage system, so it fully supports simultaneous access from multiple Hadoop clusters. As long as every EC2 instance in each cluster (including NameNodes, DataNodes, etc.) is either in the same VPC as your EFS mount targets, or can reach that VPC via VPC peering, VPN, or Direct Connect—plus the instances have the right IAM permissions (like elasticfilesystem:ClientMount)—you can mount EFS on each cluster's nodes.

For example, you'd run this same mount command across nodes in different clusters:

sudo mount -t efs fs-xxxxxx:/ /mnt/efs

Once mounted, multiple clusters can read and write to the same EFS filesystem, which is super useful for sharing datasets or coordinating cross-cluster processing tasks.

Is EFS tied to a specific Hadoop cluster? #

Nope, not at all. AWS EFS is a standalone service, completely independent of any Hadoop (or EC2) cluster. Access to EFS depends only on network connectivity and IAM permission policies, not on which cluster an instance belongs to. Any eligible client (whether it's part of a Hadoop cluster or not) can mount and use EFS as long as it meets the network and access requirements.

Can you connect to EFS from outside a Hadoop cluster via API? #

This depends on what you mean by "connect via API":

• If you're referring to managing EFS resources (like creating filesystems, modifying permissions, listing mount targets), yes! You can use AWS's official APIs (via AWS CLI, SDKs, or the AWS Management Console) from outside your Hadoop cluster. Just make sure your environment has valid AWS credentials (Access Key/Secret Key) with the necessary IAM permissions. For example, to list all your EFS filesystems via CLI:

  aws efs describe-file-systems
  

• If you're asking about reading/writing file content directly via API, EFS doesn't offer a native REST API for this—it's primarily accessed via NFS mount. However, you can still access EFS files from outside the cluster by:
  • Mounting EFS on an external EC2 instance (that can reach the EFS VPC)
  • Using AWS Transfer Family to expose EFS via SFTP/FTP for external access
  • Connecting your on-premises device to the EFS VPC via VPN/Direct Connect and mounting it locally

内容的提问来源于stack exchange，提问作者Shankar