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https://issues.apache.org/jira/browse/AMBARI-4223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13861732#comment-13861732
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Siddharth Wagle commented on AMBARI-4223:
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+1 LGTM
> Cluster topology is hard-coded
> ------------------------------
>
> Key: AMBARI-4223
> URL: https://issues.apache.org/jira/browse/AMBARI-4223
> Project: Ambari
> Issue Type: Task
> Components: controller
> Reporter: Nate Cole
> Assignee: Nate Cole
> Fix For: 1.5.0
>
> Attachments: AMBARI-4223.patch
>
>
> The cluster topology is passed to agents during setup and configuration.
> This happens via {{StageUtils}} using a static map like so:
> {code}
> componentToClusterInfoKeyMap.put("NAMENODE", "namenode_host");
> componentToClusterInfoKeyMap.put("JOBTRACKER", "jtnode_host");
> componentToClusterInfoKeyMap.put("SNAMENODE", "snamenode_host");
> componentToClusterInfoKeyMap.put("RESOURCEMANAGER", "rm_host");
> {code}
> At runtime, we determine the hosts for each role, and pass them down. When
> wiring up new services, any role missing from this map will not be sent to
> the agent, when that information may be required.
> Proposal is to maintain this map for backwards compatibility, and pass any
> undefined master/slave components as "<rolename>_hosts" Client topology need
> not be passed.
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