[jira] [Created] (AMBARI-23852) Provide a Framework For Adding A Component During Upgrade

["Jonathan Hurley (JIRA)" <ji...@apache.org>]

Jonathan Hurley created AMBARI-23852:
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             Summary: Provide a Framework For Adding A Component During Upgrade
                 Key: AMBARI-23852
                 URL: https://issues.apache.org/jira/browse/AMBARI-23852
             Project: Ambari
          Issue Type: Task
          Components: ambari-server
    Affects Versions: 2.7.0
            Reporter: Jonathan Hurley
            Assignee: Jonathan Hurley
             Fix For: 2.7.0


During an upgrade it might be necessary to add a component automatically. For example, if a component is being replaced between stacks, then Ambari needs to remove the original component and add the new one.

This is a new situation which we've never had before. AMBARI-23553 was created to automatically remove services/components during an upgrade which didn't appear in the new stack. However, to replace a service component is something that involves more thought.

Perhaps we need an action that's similar to this:
{code}
<group xsi:type="cluster" name="ADD_YARN_TIMELINE_READER" title="Replace ATS with Timeline Reader">
  <execute-stage title="Replace ATS with Timeline Reader">
    <task xsi:type="server_action" class="org.apache.ambari.server.serveraction.upgrades.AddNewComponentForExistingService">
      <summary>Add Timeline Reader to the cluster</summary>
      <parameter name="service">YARN</parameter>
      <parameter name="component">TIMELINE_READER</parameter>
      <parameter name="host-service">YARN</parameter>
      <parameter name="host-component"> APP_TIMELINE_SERVER </parameter>
    </task>
  </execute-stage>
</group>
{code}

I suppose we could also have a new type of task that does this as well:

{code}
<group xsi:type="cluster" name="ADD_YARN_TIMELINE_READER" title="Replace ATS with Timeline Reader">
  <execute-stage title="Replace ATS with Timeline Reader">
    <task xsi:type="add_component" service="YARN" component="TIMELINE_READER" host-service="YARN" host-component="APP_TIMELINE_SERVER">
      <summary>Add Timeline Reader to the cluster</summary>
    </task>
  </execute-stage>
</group>
{code}



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