Operation Scenarios

CHDFS is a high-performance distributed file system with standard HDFS access protocols and hierarchical namespaces. EMR supports read/write of data in CHDFS. This document describes how to mount a CHDFS instance to an EMR cluster.

Directions

Scenario 1. Mounting a CHDFS instance to a new cluster

New cluster: this refers to clusters created on or after December 31, 2019. For new clusters, the default CHDFS mounting address of EMR is /data/emr/hdfs/tmp/chdfs.

An EMR cluster is automatically adaptive to CHDFS. Create a CHDFS instance and set permissions reasonably to interconnect the CHDFS instance and EMR cluster. The configuration steps are as follows:

1. Create a CHDFS instance in the same region as the EMR cluster.
2. Create a permission group as needed.
3. Create a permission rule as needed.
4. Create a mount point on the same network as the EMR cluster.
5. Check the connectivity between the CHDFS instance and the EMR cluster. Use the hadoop fs command line tool to run the hadoop fs –ls ofs://${mountpoint}/ command. Here, mountpoint is the mounting address. If the file list is output properly, the CHDFS has been successfully mounted.