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Installing Java for PXF

PXF is a Java service. It requires a Java 8 or Java 11 installation on each Greenplum Database host.

Prerequisites​

Ensure that you have access to, or superuser permissions to install, Java 8 or Java 11 on each Greenplum Database host.

Procedure​

Perform the following procedure to install Java on the coordinator host, standby coordinator host, and on each segment host in your Greenplum Database cluster. You will use the gpssh utility where possible to run a command on multiple hosts.

  1. Log in to your Greenplum Database coordinator host:

    $ ssh gpadmin@<coordinator>

  2. Determine the version(s) of Java installed on the system:

    gpadmin@coordinator$ rpm -qa | grep java

  3. If the system does not include a Java version 8 or 11 installation, install one of these Java versions on the coordinator host, standby coordinator host, and on each Greenplum Database segment host.

    1. Create a text file that lists your Greenplum Database standby coordinator host and segment hosts, one host name per line. For example, a file named gphostfile may include:

      coordinator
      mstandby
      seghost1
      seghost2
      seghost3

    2. Install the Java package on each host. For example, to install Java version 8:

      gpadmin@coordinator$ gpssh -e -v -f gphostfile sudo yum -y install java-1.8.0-openjdk-1.8.0*

  4. Identify the Java 8 or 11 $JAVA_HOME setting for PXF. For example:

    If you installed Java 8:

    JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.x86_64/jre

    If you installed Java 11:

    JAVA_HOME=/usr/lib/jvm/java-11-openjdk-11.0.4.11-0.el7_6.x86_64

    If the superuser configures the newly-installed Java alternative as the system default:

    JAVA_HOME=/usr/lib/jvm/jre

  5. Note the $JAVA_HOME setting; you will need this value when you configure PXF.