In CM you can also go to CM -> HDFS -> Click on active "Namenode" link -> Open "Actions" dropdown -> Select "Refresh node list" ... View more

Not exactly, this is not an issue at all but expected. It is what the error message says, the Spark 2.3 service is now (in C6) provided by the CDH parcel. There is no separate Spark2 parcel anymore, and you need to uninstall the Spark 2 parcel as advised in the doc chapter Migrating Apache Spark Before Upgrading to CDH 6 ... View more

There are no plans to add support to C5 releases. See currently supported OS versions ... View more

Check bind-address in my.cnf config file, is it set to 127.0.0.1? ... View more

This confirmes the package is installed correctly, and the JDK is installed to /usr/lib/jvm/java-8-oracle-cloudera/ You may want to use this as JAVA_HOME when configuring CM and the cluster to use this JDK ... View more

Can you please verify your JDK installation: # apt list oracle-j2sdk1.8 # dpkg-query -L oracle-j2sdk1.8 ... View more

The Quickstart VM is a especially tailored CM/CDH cluster installation on a single VM. If you attempt to upgrade this to 6.x you will encounter a lot of issues. I personally would recommend doing a native installation of 6.2 instead.   But if you want to continue on that route, the CM server process needs to be configured to start up with this JDK installation, see step 4 in Manually Migrating from Oracle JDK to OpenJDK ... View more

There is no error here, all packages installed fine.   Just out of interest, why did you install the "-devel" package? This is not required but does not harm either. ... View more

Looks correct. Can you please copy the yum command used to install JDK 1.8 plus it's full output to here?  ... View more