Help Center> MapReduce Service> User Guide (Paris Region)> FAQ> Big Data Service Development> How Do I Balance HDFS Data?
Updated on 2022-12-14 GMT+08:00
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How Do I Balance HDFS Data?

  1. Log in to the master node of the cluster and run the corresponding command to configure environment variables. /opt/client indicates the client installation directory. Replace it with the actual one.

    source /opt/client/bigdata_env

    kinit Component service user (If Kerberos authentication is enabled for the cluster, run this command to authenticate the user. Skip this step if the Kerberos authentication is disabled.)

  2. Run the following command to start the balancer:

    /opt/client/HDFS/hadoop/sbin/start-balancer.sh -threshold 5

  3. View the log.

    After you execute the balance task, the hadoop-root-balancer-Host name.log log file will be generated in the client installation directory /opt/client/HDFS/hadoop/logs.

  4. (Optional) If you do not want to perform data balancing, run the following commands to stop the balancer:

    source /opt/client/bigdata_env

    kinit Component service user (If Kerberos authentication is enabled for the cluster, run this command to authenticate the user. Skip this step if the Kerberos authentication is disabled.)

    /opt/client/HDFS/hadoop/sbin/stop-balancer.sh -threshold 5