elek opened a new pull request #861: HDDS-1596. Create service endpoint to download configuration from SCM URL: https://github.com/apache/hadoop/pull/861 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. See: https://issues.apache.org/jira/browse/HDDS-1596
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