Cloudera Manager Enterprise Edition Frequently Asked Questions

General Questions

What are the new features of Cloudera Manager 4.5?

For a list of new features in Cloudera Manager 4.5, see New Features in Cloudera Manager 4.

What operating systems are supported?

See Requirements for Cloudera Manager for more detailed information on which platforms are supported.

What database platforms are supported?

See Requirements for Cloudera Manager for more detailed information on which database systems are supported.

What are the differences between the Free Edition and the Enterprise Edition?

Cloudera Manager Free Edition is a free version of the commercially-available Cloudera Manager product. Cloudera Manager Free Edition and Cloudera Manager automate the installation and configuration of CDH3 or CDH4 on an entire cluster. Cloudera Manager provides additional functionality.

See the matrix at How to Upgrade the Free Edition to Cloudera Manager in Cloudera Manager Free Edition Installation Guide for a comparison of the two versions. You can also view a discussion of the differences at http://www.cloudera.com/products-services/tools/.

The full-featured version of Cloudera Manager is available as part of the Cloudera Enterprise subscription offering, and requires a license.

If you are not an existing Cloudera customer, contact Cloudera Sales for information about obtaining the full-featured version of Cloudera Manager.

If you are already a Cloudera customer and you need to upgrade the Free Edition to Cloudera Manager, contact Cloudera Support to obtain a license.

What version of CDH is required for Cloudera Manager 4.5?

See Requirements for Cloudera Manager for detailed information.

Can I upgrade CDH using Cloudera Manager?

The Cloudera Manager upgrade wizard does not upgrade CDH. For instructions on upgrading CDH3, see Upgrading CDH3 in the CDH3 Installation Guide. For instructions on upgrading CDH4, see Upgrading from CDH3 to CDH4 in the CDH4 Installation Guide.

What version of CDH does Cloudera Manager 4.5 install?

Cloudera Manager 4.5 allows you to install any version of CDH3 or CDH4.

What upgrade paths are available for Cloudera Manager, and what's involved?

For instructions about upgrading, see Upgrading to Cloudera Manager 4.5.

How do I install 4.5 in a walled-off environment (no Internet access)?

You can set up a local repository and use it in the installer. For instructions, see Appendix A - Understanding Custom Installation Solutions.

Do slave nodes need access to the Cloudera public repositories for an install with Cloudera Manager?

Nodes only require access to installation files. These files are available on the Internet, but it is also possible to create local repositories that serve these files to the nodes that are being upgraded. If you have established local repositories, no access to the Cloudera public repository is required. For more information, see Creating and Using your own Repository.

Can I use the Service Monitoring features of Cloudera Manager (Enterprise Edition) without using the Service and Configuration Management piece?

No. To understand the desired state of the system, we need the global configuration that the service management feature of Cloudera Manager gathers and provides. The Cloudera Manager agent doubles as both the agent for supervision and for monitoring.

Can I run the Cloudera Management services and the Hadoop services on the host where the Cloudera Manager Server is running?

Yes. This is especially common in deployments that have a small number of hosts.

Which sudo commands does Cloudera Manager run?

The sudo commands are:

  • yum (Red Hat/CentOS/Oracle)
  • zypper (SUSE )
  • apt-get (Debian/Ubuntu)
  • apt-key (Debian/Ubuntu)
  • sed
  • service
  • /sbin/chkconfig (Red Hat/CentOS/Oracle)
  • /usr/sbin/update-rc.d ((Debian/Ubuntu))
  • id
  • rm
  • mv
  • chown
  • install

Does Cloudera Manager Support an API?

Yes. A comprehensive set of APIs for the various features is supported in this version of Cloudera Manager. For more information about the Cloudera Manager API, see the Cloudera Manager API Documentation. You can download this Cloudera Manager API example that shows how to integrate with Nagios or other systems.

Using Cloudera Manager

How do I set the rack topology script?

Cloudera Manager includes internal rack awareness scripts, but you must specify the racks where the hosts in your cluster are located. If your cluster contains more than 10 hosts, Cloudera recommends that you specify the rack for each host. HDFS and MapReduce will automatically use the racks you specify. For instructions, see Specifying the Racks for Hosts.

How do I configure my daemons to use a custom GC parameter?

Every Java-based role in Cloudera Manager has a configuration setting called "Additional Java configuration options for <role>" where you can enter command line options. Commonly, garbage collection flags or extra debugging flags would be passed here.

To find the appropriate configuration setting, select the service you want to modify in the Cloudera Manager UI, then use the keyword search to search for the Additional Java configuration options.

You can add configuration options for all instances of a given role by making this configuration change at the Service level. For example, to modify the setting for all DataNodes, select the HDFS service, then modify the "Additional Java configuration options for Datanode" setting).

To modify a configuration option for a given instance of a role, select the service, then select the particular role instance (e.g. a specific DataNode) you want to modify. The configuration settings you modify will apply to the selected role instance only.

For detailed instructions see the Modifying Service Configurations section of the Cloudera Manager User Guide.