Best way to deploy with java 8

[rmelick]

What's the best way to start up a cluster with java 8 instead of java 7? HDP Ambari documentation (https://docs.hortonworks.com/HDPDocuments/Ambari-2.2.0.0/bk_ambari_reference_guide/content/ch_changing_the_jdk_version_on_an_existing_cluster.html) suggests using ambari-server setup, but I haven't been able to get that working in an automated way.

I noticed that the ambari-base Dockerfile manually downloads a specific jdk. Is there a reason this was required? Any suggestions for how we could extend the ambari-base of ambari-server/agent Dockerfiles to install java 8 before startup?

[lalyos]

The jdk is preinstalled, in order to speed up startup time.
Right now the official ambari release is using the sepcific 1.7.0_67 version.

There are some security related issues reported with java8, so right now
we provide only java7.

However if you want to experiment with java 8 you can build the docker images locally:

Just change 2 Lines in ambar-base/Dockerfile

ENV JDK_ARTIFACT jdk-8u60-linux-x64.tar.gz
ENV JDK_VERSION jdk1.8.0_60

Than from the ambari-base dir execute a: docker build -t hortonworks/ambari-base .
After that do the same for ambari-agent and ambari-server images

[rmelick]

Thanks @lalyos. We're trying to build Dockerfiles based on ambari-server and ambari-agent with FROM, instead of copying them and replacing some params.

I've gotten it to work sort of by putting the following into our Dockerfile

# install java 8
ENV JDK_ARTIFACT jdk-8u60-linux-x64.tar.gz
ENV JDK_VERSION jdk1.8.0_60
RUN cd /usr/jdk64 && wget http://public-repo-1.hortonworks.com/ARTIFACTS/$JDK_ARTIFACT && \
    tar -xf $JDK_ARTIFACT && rm -f $JDK_ARTIFACT
ENV JAVA_HOME /usr/jdk64/$JDK_VERSION
ENV PATH $JAVA_HOME/bin:$PATH

# jce
ADD http://public-repo-1.hortonworks.com/ARTIFACTS/UnlimitedJCEPolicyJDK7.zip $JAVA_HOME/jre/lib/security/
RUN cd $JAVA_HOME/jre/lib/security && unzip UnlimitedJCEPolicyJDK7.zip && rm -f UnlimitedJCEPolicyJDK7.zip && mv UnlimitedJCEPolicy/*jar . && rm -rf UnlimitedJCEPolicy

Then, after ambari-server starts, but before I register the blueprint or start cluster deployment, I run

docker exec amb-server ambari-server setup -s -j /usr/jdk64/jdk1.8.0_60
docker exec amb-server ambari-server restart

I think it hadn't been working for me before because I had forgotten to run ambari-server restart, or I was running it after the cluster had already been deployed.

I definitely agree about preinstalling into the image to help the startup time. I think I'll open a separate thread about the possibilities of preinstalling or predownloading the contents of the HDP repo, as that would also help significantly.

[grozeille]

I'm not sure that it's needed to choose the JDK, v7 is quite old now, v8 is standard and minimal version for future stack versions.
The pull request #138 will change the jdk to be v8