Java Development Kit Installation
Some installation paths require that you install the Oracle Java Development Kit on hosts before deploying Cloudera Manager, CDH, and managed services. To install the Oracle JDK, follow the instructions in Installing the Oracle JDK. The completed installation, or any already existing installation, must meet the following requirements.
Installing the Oracle JDK
The Oracle JDK installer is available both as an RPM-based installer for RPM-based systems, and as a binary installer for other systems.
- Download the .tar.gz file for one of the supported versions of the Oracle JDK from Java SE 8 Downloads or Java SE 7 Downloads. (These links are correct at the time of writing but change frequently.)
- Extract the JDK to /usr/java/jdk-version; for example /usr/java/jdk.1.7.0_nn or /usr/java/jdk.1.8.0_nn, where nn is a supported version.
- Set JAVA_HOME to the directory where the JDK is installed. Add the following line to the specified files:
- Cloudera Manager Server host: /etc/default/cloudera-scm-server. This affects only the Cloudera Manager Server process, and does not affect the Cloudera Management Service roles.
- All hosts in an unmanaged deployment: /etc/default/bigtop-utils. You do not need to do this for clusters managed by Cloudera Manager.
- Follow the instructions in Configuring a Custom Java Home Location. This change affects all CDH processes and Cloudera Management Service roles in the cluster.