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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HDDS-1596) Create service endpoint to download configuration from SCM
Date Wed, 28 Aug 2019 16:23:00 GMT

     [ https://issues.apache.org/jira/browse/HDDS-1596?focusedWorklogId=303016&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-303016

ASF GitHub Bot logged work on HDDS-1596:

                Author: ASF GitHub Bot
            Created on: 28/Aug/19 16:22
            Start Date: 28/Aug/19 16:22
    Worklog Time Spent: 10m 
      Work Description: anuengineer commented on issue #861: HDDS-1596. Create service endpoint
to download configuration from SCM
URL: https://github.com/apache/hadoop/pull/861#issuecomment-525819238
   Done, committed in the trunk.
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Issue Time Tracking

    Worklog Id:     (was: 303016)
    Time Spent: 4h  (was: 3h 50m)

> Create service endpoint to download configuration from SCM
> ----------------------------------------------------------
>                 Key: HDDS-1596
>                 URL: https://issues.apache.org/jira/browse/HDDS-1596
>             Project: Hadoop Distributed Data Store
>          Issue Type: Sub-task
>            Reporter: Elek, Marton
>            Assignee: Elek, Marton
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 4h
>  Remaining Estimate: 0h
> As written in the design doc (see the parent issue) it was proposed to download the configuration
from the scm by the other services.
> I propose to create a separated endpoint to provide the ozone configuration. /conf can't
be used as it contains *all* the configuration and we need only the modified configuration.
> The easiest way to implement this feature is:
>  * Create a simple rest endpoint which publishes all the configuration
>  * Download the configurations to $HADOOP_CONF_DIR/ozone-global.xml during the service
>  * Add ozone-global.xml as an additional config source (before ozone-site.xml but after
>  * The download can be optional
> With this approach we keep the support of the existing manual configuration (ozone-site.xml
has higher priority) but we can download the configuration to a separated file during the
startup, which will be loaded.
> There is no magic: the configuration file is saved and it's easy to debug what's going
on as the OzoneConfiguration is loaded from the $HADOOP_CONF_DIR as before.
> Possible follow-up steps:
>  * Migrate all the other services (recon, s3g) to the new approach. (possible newbie
>  * Improve the CLI to define the SCM address. (As of now we use ozone.scm.names)
>  * Create a service/hostname registration mechanism and autofill some of the configuration
based on the topology information.

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