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https://issues.apache.org/jira/browse/HDDS-13890?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Doroszlai updated HDDS-13890:
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Issue Type: New Feature (was: Task)
> Datanode supports dynamic configuration of SCM
> ----------------------------------------------
>
> Key: HDDS-13890
> URL: https://issues.apache.org/jira/browse/HDDS-13890
> Project: Apache Ozone
> Issue Type: New Feature
> Reporter: Ivan Andika
> Assignee: Ivan Andika
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.2.0
>
>
> Currently if we would like to migrate the SCM from (scm1, scm2, scm3) to
> (scm4, scm5, scm6), all the datanodes need to be restarted 2 times with
> updated "ozone.scm.nodes.<service>" configuration
> # Before migration: Update ozone.scm.nodes to (scm1, scm2, scm3, scm4, scm5,
> scm6)
> # After (scm1, scm2, scm3) are decommissioned: Update ozone.scm.nodes to
> (scm4, scm5, scm6)
> As mentioned in HDDS-12391, rolling restarting all the datanodes might take a
> while. For large datanodes fleet this might take a lot of time (days or even
> weeks).
> It might be good to support dynamic reconfiguration of SCM endpoints in DN to
> prevent restarts. A possible flow
> # Admin update the "ozone.scm.nodes" to the new value (with some new nodes
> and removed nodes)
> # DN will compare the new and previous configuration and find the SCM
> endpoints to add and remove
> # DN will add the SCM endpoints (e.g. SCMConnectionManager#addSCMServer) and
> then remove the SCM endpoints (e.g. SCMConnectionManager#removeSCMServer).
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