Before You Install CDH 5 on a Cluster
Before you install CDH 5 on a cluster, there are some important steps you need to do to prepare your system:
- Verify you are using a supported operating system for CDH 5. See CDH 5 Requirements and Supported Versions.
- If you haven't already done so, install the Oracle Java Development Kit. For instructions and recommendations, see Java Development Kit Installation.
Scheduler Defaults
Note the following differences between MRv1 (MapReduce) and MRv2 (YARN).
- MRv1 (MapReduce v1):
- Cloudera Manager and CDH 5 set the default to FIFO.
- MRv2 (YARN):
- Cloudera Manager and CDH 5 set the default to Fair Scheduler.
High Availability
In CDH 5, you can configure high availability both for the NameNode and the JobTracker or ResourceManager.
- For more information and instructions on setting up a new HA configuration, see High Availability.