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Date: Mon, 27 Oct 2014 18:55:35 +0000 (UTC)
From: "Robert Levas (JIRA)" <jira@apache.org>
To: dev@ambari.apache.org
Message-ID: <JIRA.12750780.1414420109000.346501.1414436135968@Atlassian.JIRA>
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 <JIRA.12750780.1414420109510@arcas>
Subject: [jira] [Commented] (AMBARI-7985) Allow for server-side commands
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    [ https://issues.apache.org/jira/browse/AMBARI-7985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14185607#comment-14185607 ] 

Robert Levas commented on AMBARI-7985:
--------------------------------------

Ack.. forgive my formatting... too many different markdown flavors. 

> Allow for server-side commands
> ------------------------------
>
>                 Key: AMBARI-7985
>                 URL: https://issues.apache.org/jira/browse/AMBARI-7985
>             Project: Ambari
>          Issue Type: New Feature
>          Components: ambari-server
>    Affects Versions: 2.0.0
>            Reporter: Robert Levas
>            Assignee: Robert Levas
>              Labels: ambari-server, commands, server, server-side, tasks
>             Fix For: 2.0.0
>
>
> Ambari currently handles _client-/agent-side_ commands; however there is no ability to handle _server-side_ commands. Server-side commands should be specified as a task in a stage and managed along with the stage.
> *Use Case:*  Generate principals and keytabs on the Ambari server before sending the keytabs to their relevant hosts.
> *Implementation:*  To add the concept of a server-side task:
> * update {{org.apache.ambari.server.serveraction.ServerAction}} to be an _abstract class_
> ** _server-side_ tasks must implement this class 
> * reuse existing _host_role_command_ and _execution_command_ data
> ** _server-side_ tasks are to have a role of {{AMBARI_SERVER_ACTION}}
> ** _server-side_  execution command data should be encapsulated as JSON and specify the ServerAction implementation class and any needed payload data
> * {{org.apache.ambari.server.actionmanager.ActionScheduler}} and {{org.apache.ambari.server.serveraction.ServerActionManagerImpl}} need to be updated to handle the execution of server-side tasks
> ** each _server-side_ task should be executed in its own thread.
> *** _server_side_ tasks should be executed in (staged) order, serially - not in parallel
> *** _server_side_ tasks should ensure not to mess up _stage_ ordering


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