beobal commented on code in PR #3967:
URL: https://github.com/apache/cassandra/pull/3967#discussion_r1993500315
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src/java/org/apache/cassandra/schema/SchemaKeyspace.java:
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@@ -140,6 +140,7 @@ private SchemaKeyspace()
+ "clustering_order text,"
+ "column_name_bytes blob,"
+ "kind text,"
+ + "unique_id int,"
Review Comment:
The only way to witness some epoch without witnessing preceding epochs is
to have caught up via a snapshot of some state inbetween (so it's not possible
with consecutive epochs like this).
After (in epoch terms) the uid-assigning feature has been activated, then
the transform in your epoch 2 which performs an alter table to add v3 will
assign uids. In order for any node to witness the transform in your epoch 3
which adds v2, it must also have either witnessed epoch 2 *or* a snapshot
containing the effects of epoch 2 (i.e. it will know about v3, and as the uids
are part of TableMetadata it will know about them as well).
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