Tsz-wo Sze created HDDS-13053:
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Summary: SCM and OM should not allow changing Raft group size to
an even number
Key: HDDS-13053
URL: https://issues.apache.org/jira/browse/HDDS-13053
Project: Apache Ozone
Issue Type: Improvement
Components: OM HA, SCM HA
Reporter: Tsz-wo Sze
Assignee: Tsz-wo Sze
Setting the Raft group size to an even number for HA does not make sense. As
an example, support group size is 4. It only can tolerate 1 failure, which is
the same as group size 3. However, It is harder to get the majority comparing
to group size 3 -- it requires 3 instead of 2.
We should just fail it when setting a Raft group to an even number.
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