[jira] [Commented] (AMBARI-7985) Allow for server-side commands

["Siddharth Wagle (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AMBARI-7985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14185423#comment-14185423 ] 

Siddharth Wagle commented on AMBARI-7985:
-----------------------------------------

- _Server-side commands should be specified as a task in a stage_
Does this mean a server action is a part of Role Command order, and if it is, since all server actions have the same role AMBARI_SERVER_ACTION, how can it be specified in the ordering.

- _each server-side task should be executed in its own thread_
A stage in Ambari is a way of grouping tasks that can be executed in parallel (one command per host), if server action follows max one action per stage, it would be executed serially by the Action Scheduler.
I am not sure I understand, why the need for separate thread to execute server actions, could you explain the need for this ?

> 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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