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From "Alejandro Fernandez (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMBARI-8970) Custom Actions for Namenode to execute tasks by calling a python script
Date Sat, 03 Jan 2015 00:21:34 GMT

     [ https://issues.apache.org/jira/browse/AMBARI-8970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alejandro Fernandez updated AMBARI-8970:
----------------------------------------
    Attachment:     (was: AMBARI-8970.patch)

> Custom Actions for Namenode to execute tasks by calling a python script
> -----------------------------------------------------------------------
>
>                 Key: AMBARI-8970
>                 URL: https://issues.apache.org/jira/browse/AMBARI-8970
>             Project: Ambari
>          Issue Type: Technical task
>          Components: ambari-server
>    Affects Versions: 2.0.0
>            Reporter: Alejandro Fernandez
>            Assignee: Alejandro Fernandez
>             Fix For: 2.0.0
>
>
> Currently, the upgrade-2.2.xml file, which contains the Upgrade Pack, defines the exact
commands to run for the Namenode prepare and finalize steps.
> The downside of having this logic in the xml file is that it makes it difficult to maintain,
and is not as powerful as being able to run the commands by using Python and its functions.
Therefore, it is preferable for the ExecuteTask to be able to invoke a function inside a script.
> The plan is for Namenode to have functions for prepare and finalize, and for the upgrade
pack to contain something like,
> Masters Group,
> {code}
>     <service name="HDFS">
>       <component name="NAMENODE">
>         <pre-upgrade>
>           <task xsi:type="execute" hosts="master">
>             <script>scripts/namenode.py</script>
>             <function>prepare_rolling_upgrade</function>
>           </task>
>         </pre-upgrade>
>      </component>
>    </service>
> {code}
> While the Cluster Group has,
> {code}
>       <execute-stage service="HDFS" component="NAMENODE" title="Execute HDFS Finalize">
>         <task xsi:type="execute" hosts="master">
>           <script>scripts/namenode.py</script>
>           <function>finalize_rolling_upgrade</function>
>         </task>
>       </execute-stage>
> {code}



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