Help Center/ MapReduce Service/ User Guide (Ankara Region)/ Configuring a Cluster with Decoupled Storage and Compute/ Interconnecting with OBS Using the Guardian Service/ Interconnecting Components with OBS Using Guardian/ Interconnecting HDFS with OBS
Updated on 2024-11-29 GMT+08:00
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Interconnecting HDFS with OBS

Interconnecting with OBS

  1. Log in to the node on which the HDFS client is installed as a client installation user.
  2. Run the following command to switch to the client installation directory:

    cd Client installation directory

  3. Run the following command to configure environment variables:

    source bigdata_env

  4. If the cluster is in security mode, run the following command to authenticate the user. The user must have the read and write permissions on the OBS directory. Skip user authentication for normal clusters.

    kinit User performing HDFS operations

  5. Explicitly add the OBS file system to be accessed in the HDFS command line.

    The following commands are examples.

    • Access the OBS file system.

      hdfs dfs -ls obs://OBS parallel file system name/Path

    • Create a directory in the OBS file system.

      hdfs dfs -mkdir obs://OBS parallel file system name/hadoop

    • Upload the /opt/test.txt file on the client node to the obs://OBS parallel file system name/hadoop directory.

      hdfs dfs -put /opt/test.txt obs://OBS parallel file system name/hadoop

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

Configuring Ranger Permissions

  1. Log in to FusionInsight Manager and choose System > Permission > User Group. On the displayed page, click Create User Group to create a user group without any roles, for example, obs_hadoop.
  2. Back to FusionInsight Manager and choose System > Permission > User. On the displayed page, click Create User to create a user that is associated only with the obs_hadoop user group, for example, hadoopuser.
  3. Log in to the Ranger management page as the rangeradmin user.
  4. On the home page, click component plug-in name OBS in the EXTERNAL AUTHORIZATION area.
  5. Click Add New Policy and add the Read and Write permissions on the desired OBS paths to the created user group.

    The following figure shows the configurations needed for adding the Read and Write permissions on obs://OBS parallel file system name/hadoop to user group obs_hadoop.