[jira] [Commented] (AMBARI-3548) Changes to stacks definitions to allow custom services support (needed by an ambari-agent)

["Sumit Mohanty (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AMBARI-3548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13818156#comment-13818156 ] 

Sumit Mohanty commented on AMBARI-3548:
---------------------------------------

Overall looks good. Some preliminary comments:

* We can define SERVICE_CHECK as a command. As its not a custom command it need not be in the service spec. Alternatively, DECOMMISSION_DATANODE is a good candidate for a custom command. When HDFS moves to the new service spec structure we can wire it up correctly.

* In the new HBASE spec, can we add DECOMMISSION_REGIONSERVER as a custom command. I will use that to wire up the API flow for custom command. The implementation of this custom command can be a NOP.

* AMBARI-3731 will introduce some refactoring that will affect this patch. _We can work together to merge them._ This JIRA lays the base code to create custom action and a later JIRA will wire that up to the new ExecutionCommand format.



> Changes to stacks definitions to allow custom services support (needed by an ambari-agent)
> ------------------------------------------------------------------------------------------
>
>                 Key: AMBARI-3548
>                 URL: https://issues.apache.org/jira/browse/AMBARI-3548
>             Project: Ambari
>          Issue Type: Bug
>          Components: controller
>    Affects Versions: 1.5.0
>            Reporter: Dmitry Lysnichenko
>            Assignee: Dmitry Lysnichenko
>             Fix For: 1.5.0
>
>         Attachments: AMBARI-3548_preview.patch, hbase_new_metainfo.json, hbase_new_metainfo.xml, hbase_old_metainfo.xml, new-style-command-dump.txt, service_metainfo_changes.patch
>
>
> Stack definitions for custom services should contain fields:
> - service metadata
> -- list of repositories
> - component metadata should contain fields:
> -- scriptType (possible values: "python", "puppet")
> -- taskTimeout (per-component value)
> Except metadata files, custom service directory should contain:
> - script directory that contains separate python files for components (e.g. namenode.py, datanode.py etc.) and service.py file.
> - a separate directory for templates
> Patch is so large because I've created a separate stack dir with modified HBase metadata.



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