Stephen O'Donnell created HDDS-14496:
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Summary: Epic to track tasks related to ZDU for Ozone
Key: HDDS-14496
URL: https://issues.apache.org/jira/browse/HDDS-14496
Project: Apache Ozone
Issue Type: Epic
Reporter: Stephen O'Donnell
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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