Interconnecting HDFS with OBS Using an IAM Agency

After configuring decoupled storage and compute for a cluster by referring to Interconnecting an MRS Cluster with OBS Using an IAM Agency, you can view and create OBS file directories on the HDFS client.

Interconnecting HDFS with OBS

Log in to the node where the HDFS client is installed as the client installation user.
Run the following command to switch to the client installation directory.

cd Client installation directory
Run the following command to configure environment variables:

source bigdata_env
If the cluster is in security mode, authenticate the user. In normal mode, skip user authentication.

kinit Component service user
Explicitly add the OBS file system to be accessed in the HDFS command line.

For example:
- Run the following command to access the OBS file system:
  hdfs dfs -ls obs://OBS parallel file system name/Path
  
  For example, run the following command to access the mrs-word001 parallel file system. If the file list is returned, OBS is successfully accessed.
  
  hadoop fs -ls obs://mrs-word001/
  Figure 1 Returned file list
- Run the following command to upload the /opt/test.txt file from the client node to the OBS file system path:
  hdfs dfs -put /opt/test.txt obs://OBS parallel file system name/Path

If a large number of logs are printed in the OBS file system, the read and write performance may be affected. You can adjust the log level of the OBS client as follows:

cd Client installation directory/HDFS/hadoop/etc/hadoop

vi log4j.properties

Add the OBS log level configuration to the file as follows:

log4j.logger.org.apache.hadoop.fs.obs=WARN

log4j.logger.com.obs=WARN

Run the following command to view the log level:

tail -4 log4j.properties

Figure 2 Viewing the log level