[jira] [Created] (HDDS-1596) Create service endpoint to download configuration from SCM

["Elek, Marton (JIRA)" <ji...@apache.org>]

Elek, Marton created HDDS-1596:
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             Summary: 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


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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