errose28 commented on PR #3741:
URL: https://github.com/apache/ozone/pull/3741#issuecomment-1251531676
The cluster ID directory on the datanode has a complicated history, but it
is not related to schema V3. For a detailed look see HDDS-5432 and the design
document linked there. Basically before SCM HA the cluster ID directory on each
volume was actually using the SCM ID. This became a problem when SCM HA was
introduced since there are now 3 SCMs, but renaming the directory was an
incompatible change. At the end of it all the volume could be formatted in the
following ways:
- Only cluster ID directory
- The volume was formatted with Ozone 1.3.0
- SCM ID directory pointed to by a cluster ID symlink
- The volume was formatted with Ozone <= 1.2.0 and SCM HA was finalized.
- Only SCM ID
- The volume was formatted with Ozone <= 1.2.0 and SCM HA has not yet
been finalized.
- This would happen on the upgrade path from 1.1.0 to 1.3.0
In general you should not need to worry about this. Just call
`VersionedDatanodeFeatures#ScmHA#chooseContainerPathID` and use the result as
the parent directory.
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