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https://issues.apache.org/jira/browse/HDDS-1596?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elek, Marton reopened HDDS-1596:
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> 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
> Fix For: 0.5.0
>
> Time Spent: 4h 10m
> 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 startup.
> * Add ozone-global.xml as an additional config source (before ozone-site.xml
> but after ozone-default.xml)
> * 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 jiras)
> * 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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