HW9 Java Installation for Spark

[rocket-ron]

The Spark installation indicates installing JDK 1.8, but apparently the latest CENTOS 7 x64 image / RPMs installs both 1.7 and 1.8 and sets the default to 1.7. To correct this, issue the following command:

[root@spark1 ~]# alternatives --config java

There are 2 programs which provide 'java'.

Selection Command

1 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-2.b17.el7_1.x86_64/jre/bin/java
*+ 2 /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.91-2.6.2.1.el7_1.x86_64/jre/bin/java

Enter to keep the current selection[+], or type selection number: 1

Once done, do java --version to check that the correct version is selected.