Configuring the Cluster

This section contains information on configuring MapR clusters.

After installing the MapR core and any desired Hadoop components, you might need to perform additional tasks to ready the cluster for production.

Setting up the MapR Metrics Database. In order to use MapR Metrics you have to set up a MySQL database where metrics data will be logged.
Setting up Topology The locations of nodes and racks in a cluster determine the location of replicated copies of data. Optimally defined cluster topology results in data being replicated to separate racks, providing continued data availability in the event of rack or node failure.
Setting Up Volumes Keeping volume hierarchy efficient to maximize data availability. Without a volume structure in place, performance will be negatively affected. Referring to the volume plan created in Planning the Cluster, use the MapR Control System or the maprcli command to create and mount distinct volumes to allow more granularity in specifying policy for subsets of data. If you do not set up volumes, and instead store all data in the single volume mounted at /, it creates problems in administering data policy later as data size grows.
Setting Up Central Configuration MapR services can be configured globally across the cluster, from master configuration files stored in a MapR-FS, eliminating the need to edit configuration files on all nodes individually.
Designating Subnets for MapR If multiple NICs are present on nodes, you can configure MapR to use one or more of them, depending on the cluster's need for bandwidth. See Cluster Design Objectives for more information.
Setting up MapR NFS Access data on a licensed MapR cluster, mount the MapR cluster, and use standard shell scripting to read and write live data through NFS, which can be faster than using hadoop fs commands.
Configuring Authentication. If you use Kerberos, LDAP, or another authentication scheme, make sure PAM is configured correctly to give MapR access.
Configuring Permissions By default, users are able to log on to the MapR Control System, but do not have permission to perform any actions. You can grant specific permissions to individual users and groups.
Setting Usage Quotas You can set specific quotas for individual users and groups.
Configuring Alarm Notifications If an alarm is raised on the cluster, MapR sends an email notification. For example, if a volume goes over its allotted quota, MapR raises an alarm and sends email to the volume creator.
Setting Up the Client and MapR POSIX Client You can access the cluster either by logging into a node on the cluster, or by installing MapR client software on a machine with access to the cluster's network.
Working with Mirror Volumes To access multiple clusters or mirror data between clusters, work with mirror volumes.