Cloudera Docs

Moving Monitoring Data on an Active Cluster

You can change where monitoring data is stored on a cluster.

Basic: Changing the Configured Directory

  1. Stop the Service Monitor or Host Monitor.
  2. Save your old monitoring data and then copy the current directory to the new directory (optional).
  3. Update the Storage Directory configuration option (firehose.storage.base.directory) on the corresponding role configuration page.
  4. Start the Service Monitor or Host Monitor.

Advanced: High Performance

For the best performance, and especially for a large cluster, Host Monitor and Service Monitor storage directories should have their own dedicated spindles. In most cases, that provides sufficient performance, but you can divide your data further if needed. You cannot configure this directly with Cloudera Manager; instead, you must use symbolic links.

For example, if all your Service Monitor data is located in /data/1/service_monitor, and you want to separate your Impala data from your time series data, you could do the following:

  1. Stop the Service Monitor.
  2. Move the original Impala data in /data/1/service_monitor/impala to the new directory, for example /data/2/impala_data.
  3. Create a symbolic link from /data/1/service_monitor/impala to /data/2/impala_data with the following command:
    ln -s /data/2/impala_data /data/1/service_monitor/impala
  4. Start the Service Monitor.