Help Center/ MapReduce Service/ User Guide (ME-Abu Dhabi Region)/ Storage-Compute Decoupling Operation Guide/ Using a Storage-Compute Decoupled Cluster/ Interconnecting Spark2x with OBS
Updated on 2022-02-22 GMT+08:00
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Interconnecting Spark2x with OBS

The OBS file system can be interconnected with Spark2x after an MRS cluster is installed.

Using Spark Beeline After Cluster Installation

  1. Log in to FusionInsight Manager and choose Cluster > Services > Spark2x > Configurations > All Configurations.

    In the left navigation tree, choose JDBCServer2x > Customization. Add dfs.namenode.acls.enabled to the spark.hdfs-site.customized.configs parameter and set its value to false.

  2. Save the configuration and restart the JDBCServer2x instance.
  3. Log in to the client installation node as the client installation user.
  4. Run the following command to configure environment variables:

    source ${client_home}/bigdata_env

  5. For a security cluster, run the following command to perform user authentication. If Kerberos authentication is not enabled for the current cluster, you do not need to run this command.

    kinit Username

  6. Access OBS in spark-beeline. For example, create a table named test in the obs://mrs-word001/table/ directory.

    create table test(id int) location 'obs://mrs-word001/table/';

  7. Run the following command to query all tables. If table test is displayed in the command output, OBS access is successful.

    show tables;

    Figure 1 Verifying the created table name returned using Spark2x

  8. Press Ctrl+C to exit the Spark Beeline.

Using Spark SQL After Cluster Installation

  1. Log in to the client installation node as the client installation user.
  2. Run the following command to configure environment variables:

    source ${client_home}/bigdata_env

  3. Modify the configuration file:

    vim ${client_home}/Spark2x/spark/conf/hdfs-site.xml

    <property>
<name>dfs.namenode.acls.enabled</name>
<value>false</value>
</property>

  4. For a security cluster, run the following command to perform user authentication. If Kerberos authentication is not enabled for the current cluster, you do not need to run this command.

    kinit Username

  5. Access OBS in spark-sql. For example, create a table named test in the obs://mrs-word001/table/ directory.
  6. Run the cd ${client_home}/Spark2x/spark/bin command to access the spark bin directory and run ./spark-sql to log in to spark-sql CLI.
  7. Run the following command in the spark-sql CLI:

    create table test(id int) location 'obs://mrs-word001/table/';

  8. Run the show tables; command to confirm that the table is created successfully.
  9. Run exit; to exit the spark-sql CLI.

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_home}/Spark2x/spark/conf

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