Cloudera CDH 5.12 on RHEL
- Install one of the CDH and Cloudera Manager Supported JDK Versions.
- Install the same version of the Oracle JDK on each host.
- Install the JDK in /usr/java/jdk-version
- All nodes must run the same JDK version.
- Cloudera only supports 64bit JDK from Oracle.
Upgrading to Oracle JDK 1.8 in a Cloudera Manager Deployment
- Upgrade to CM and CDH 5.3 or higher if you have not done so.
- Download the JDK1.8 from the Oracle website (this url may change over time):
After downloading check the package is not corrupted:
$ rpm -Kv jdk-8u162-linux-x64.rpm
Header SHA1 digest: OK (4af05fafe672648d44985001270dbe05ccc7ec05)
MD5 digest: OK (d35444d1409ff121d20f31079fcc9f1f)
Copy the downloaded jdk file to a temporary directory in each host in the cluster.
3. Stop the Cloudera Management Service from Cloudera manager status page.
4. Stop all clusters from Cloudera manager status page.
5.Stop all Cloudera Manager Agents on all nodes.
/root>service cloudera-scm-agent stop
Stopping cloudera-scm-agent: [ OK ]
6.Stop the Cloudera Manager Server on the nodes where CM server is deployed.
/root>service cloudera-scm-server stop
Stopping cloudera-scm-server: [ OK ]
7.On the Cloudera Manager Server host and each cluster host:
- Install the same supported version of JDK 1.8 which was already downloaded above.
7.2 Go to the directory where you downloaded the jdk-8u162-linux-x64.rpm file and run the install command:
yum localinstall jdk-8u162-linux-x64.rpm
$ cd /usr/java
lrwxrwxrwx 1 root root 16 Apr 4 17:35 default -> /usr/java/latest
drwxr-xr-x 9 root root 4096 Jun 29 2015 jdk1.6.0_31
drwxr-xr-x 8 root root 4096 Jun 29 2015 jdk1.7.0_67-cloudera
drwxr-xr-x 9 root root 4096 Apr 4 17:35 jdk1.8.0_162
lrwxrwxrwx 1 root root 22 Apr 4 17:35 latest -> /usr/java/jdk1.8.0_162
$ /usr/java>java -version
java version “1.8.0_162”
Java(TM) SE Runtime Environment (build 1.8.0_162-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.162-b12, mixed mode)
8. On the Cloudera Manager Server host, configure the location of the JDK in following files. Add this line if not there in the file: /etc/default/cloudera-scm-server
9. Start the Cloudera Manager Server
- Start all Cloudera Manager Agents in each node
$ service cloudera-scm-agent start
Starting cloudera-scm-agent: [ OK ]
11. Configure the location of the JDK on cluster hosts.
Navigate to Hosts -> Configuration -> Java Home Directory, and set it to jdk version such as /usr/java/jdk1.8.0_162
[NOTE: If this field is left blank everything will start except streamsets service so we need to populate this field]
13. Start all clusters in Cloudera Manager. May need to restart some of the services in CMgr that dont come up first time.
14. Start the Cloudera Management Service.
This completes the JDK1.8 upgrade. You can verify in Cloudera Manager->Support->About the new jdk version:
Java VM Name: Java HotSpot(TM) 64-Bit Server VM
Java VM Vendor: Oracle Corporation
Java Version: 1.8.0_162