To 1.7

TODOSimply download the latest JDK7 RPM from the Oracle website, install on all nodes (check that "/usr/java/latest" and "/usr/java/default" now point to the right directory, and restart "infinit.e-index-engine" and "tomcat6-interface-engine" services (the latter only on API nodes, the former typically on both)

To 1.8

...

Using scp within cygwin, scp the rpm file over to the target machine,e.g.

Code Block
scp /home/jfreydank/jfreydank_win/Downloads/jdk-8u25-linux-x64.rpm ec2-user@dev.ikanow.com:~

Install the rpm: 

Code Block
sudo rpm -i jdk-8u25-linux-x64.rpm

Check if java is installed correctly:

Code Block
[ec2-user@ip-10-113-42-186 java]$ java -version java version "1.8.0_25" Java(TM) SE Runtime Environment (build 1.8.0_25-b17) Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

Keeping Hadoop in sync

After upgrading to a version with a differerent JDK (eg elasticsearch 1.3+) requires JDK7, it will likely be necessary to modify the Hadoop configuration to use a compatible JRE.

Go the "mapreduce" service configuration pages (described here), and in the "MapReduce Service Environment Safety Valve" text box, add the line (eg):

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