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https://issues.apache.org/jira/browse/HDDS-14167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang updated HDDS-14167:
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Epic Link: HDDS-14438 (was: HDDS-13681)
> [Docs] OM HA Migration
> ----------------------
>
> Key: HDDS-14167
> URL: https://issues.apache.org/jira/browse/HDDS-14167
> Project: Apache Ozone
> Issue Type: Task
> Components: OM, OM HA
> Reporter: Ivan Andika
> Assignee: Ivan Andika
> Priority: Major
>
> Add documentation for OM migrations. There are two main approaches
> * Configuration-based OM migrations:
> ** Pros: Safer
> ** Cons: Slower, requires all clients to update the OM configurations
> * DNS-based OM migrations: Use DNS mapping to point the same OM address to
> the new OM machine
> ** Pros: Faster, clients can use the same OM configurations
> *** For example, om1-host can be changed from old ip 10.0.0.1 to new ip
> 10.0.0.4
> ** Cons: Riskier
> *** Some clients might have hardcoded /etc/hosts might not be able to see
> the DNS mapping changes
> **** Need to take into account DNS caching TTL
> *** Unplanned leader election might promote the old OM that already
> unreferenced by the DNS mapping and clients cannot find the leader
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