Switch from IBM Open JDK to Oracle JDK

If you are migrating from an IOP cluster with the IBM Open JDK on x86 hardware, we recommend that you modify your cluster to use the Oracle JDK (the default JDK for HDP clusters).

Verify current settings in the /etc/ambari-server/conf/ambari.properties file:

cat /etc/ambari-server/conf/ambari.properties | grep java
java.home=/usr/jdk64/java-1.8.0-openjdk-1.8.0.121-0.b13.el6_8.x86_64
java.releases=jdk1.8,jdk1.7
java.releases.ppc64le=
openjdk1.8.re=(java.*)/jre

Download and install Oracle JDK8 on all hosts in the cluster.

	Note
For IOP clusters operating on IBM Power Systems, continue to use OpenJDK. You should: Upgrade OpenJDK to version 8 Install the Java Cryptography Extension (JCE) For a Kerberized cluster, you should also: Regenerate Keytabs Restart Services

Note

For IOP clusters operating on IBM Power Systems, continue to use OpenJDK. You should:

For a Kerberized cluster, you should also:

Modify the java.home variable in the /etc/ambari-server/conf/ambari.properties file to point to the downloaded Oracle Open JDK home, example:
```
java.home=/usr/java/jdk1.8.0_112
```
Restart Ambari server.
```
ambari-server restart
```
When all services are re-started as a part of the Express Upgrade, the Oracle JDK will be used.

​Switch from IBM Open JDK to Oracle JDK

Switch from IBM Open JDK to Oracle JDK