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https://issues.apache.org/jira/browse/HDDS-14496?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ethan Rose updated HDDS-14496:
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Summary: Zero Downtime Upgrade (was: Epic to track tasks related to ZDU
for Ozone)
> Zero Downtime Upgrade
> ---------------------
>
> Key: HDDS-14496
> URL: https://issues.apache.org/jira/browse/HDDS-14496
> Project: Apache Ozone
> Issue Type: Epic
> Reporter: Stephen O'Donnell
> Priority: Major
>
> This epic is to track the tasks related to Ozone Zero Downtime Upgrade (ZDU).
> The goal of Zero Downtime Upgrade (ZDU) is to allow the software running an
> existing Ozone cluster to be upgraded while the cluster remains operational.
> There should be no gaps in service and the upgrade should be transparent to
> applications using the cluster.
> Ozone is already designed to be fault tolerant, so the rolling restart of
> SCM, OM and Datanodes is already possible without impacting users of the
> cluster. The challenge with ZDU is therefore related to wire and disk
> compatibility, as different components within the cluster can be running
> different software versions concurrently.
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