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https://issues.apache.org/jira/browse/AMBARI-9972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14351241#comment-14351241
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Alejandro Fernandez commented on AMBARI-9972:
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This is a good idea. For most/all components, the INSTALL command has to check
the packages (which is time consuming), and in cases where multiple versions
exist, set which version of the binaries to use (right now only done by
hdp-select). I don't think we can skip sending the command, but we can optimize
its execution time on the agent.
> Provide means to skip INSTALL commands when bits are already installed on the
> node
> ----------------------------------------------------------------------------------
>
> Key: AMBARI-9972
> URL: https://issues.apache.org/jira/browse/AMBARI-9972
> Project: Ambari
> Issue Type: Task
> Reporter: Ivan Mitic
> Fix For: 2.0.0
>
>
> To better support cloud deployments, Ambari should be able to recognize that
> packages have already been preinstalled on the VM image, and skip the INSTALL
> commands. Based on the measurements with latest Ambari 2.0 and HDP 2.2,
> INSTALL phase takes ~3 minutes, so skipping these steps will contribute
> significantly to the overall deployment latency.
> Things are not as strait forward as mentioned above, as some components might
> do some steps beyond just INSTALL, but that's ok given that these are
> exceptions we can handle/eliminate on case-by-case basis.
> Ambari preinstall and postinstall hooks can generally be run only once during
> sys-prep so there shouldn't be any problems there.
> Let's use this Jira to further discuss the design and come up with a patch
> that will address this requirement.
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