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From "Andrew Onischuk (JIRA)" <>
Subject [jira] [Resolved] (AMBARI-4504) role_command_order is not inherited from the parent stack
Date Mon, 08 Dec 2014 16:11:12 GMT


Andrew Onischuk resolved AMBARI-4504.
    Resolution: Fixed

Committed to trunk

> role_command_order is not inherited from the parent stack
> ---------------------------------------------------------
>                 Key: AMBARI-4504
>                 URL:
>             Project: Ambari
>          Issue Type: Task
>          Components: ambari-server, test
>    Affects Versions: 1.5.0
>            Reporter: Dmitry Lysnichenko
>            Assignee: Dmitry Lysnichenko
>             Fix For: 2.0.0
> h1. Implementation proposal
> The most common use case for stack extension is adding new services or slightly modifying
existing ones. So typically child's RCO file should look like a diff ("What dependencies should
we add to parent's RCO to support newly added services?"). For  more complex situations (when
changes that are introduced by child stack fundamentally change RCO), it makes sense to redefine
a complete RCO file instead of inheritance. That's why I propose to keep RCO file syntax simple
and don't implement support of deleting/modifying specific dependency or dependency group.

> We will support two options(policies) for stack extension:
> - extend parent's RCO, appending dependencies specified at child's RCO to corresponding
groups of parent's RCO (default). For every dependency group, parent's set of dependencies
and child's set of dependencies are merged.
> - completely override (replace) parent's RCO by child's RCO file.
> If role_command_order.json file is absent at stack, parent's file is used.
> Policy selection is performed via "rco-policy" key at role_command_order.json file 
> {code}
> {
>   "_comment" : "rco-policy defines how do we build RCO when stack extension is performed.
Possible values are: append (add child's dependencies to", 
>   "_comment" : "parent's RCO) and replace (ignore parent's RCO)", 
>   "rco-policy" : "append",
>  "_comment" : "Record format:",
>   "_comment" : "blockedRole-blockedCommand: [blockerRole1-blockerCommand1, blockerRole2-blockerCommand2,
>   "general_deps" : {
>     "_comment" : "dependencies for all cases",
>  {code}
> Also, in debug mode, an effective RCO will be printed to log to simplify troubleshooting.

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