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Josh McKenzie commented on CASSANDRA-15588:
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[~xingh] We don't have a shepherd here which is concerning item #1 (probably
should hit up ML for this and the couple other tickets on this epic w/out; I
can take that on shortly). Diff testing workloads has proven to be one of the
most powerful ways to confirm mixed version clusters are behaving, and we can
reasonably expect a post CASSANDRA-8099 cluster to 4.0 to have significantly
less risk and exposure to defects than the straddle as they don't rely on
LegacyLayout.
I don't see much of a path other than having a corpus of real user schemas we
can run through cassandra-diff w/a generative workload and forward + reverse
iteration to confirm correctness; we're not there yet, and while we should have
the framework to accept that in the relatively near future, I think blocking a
4.0 release on us building up that collection of anonymized schemas is a pretty
big set of unknowns.
So the current relatively inadequate technical coverage we have (afaik) is in
upgrade_tests in the dtest repo
([link|[https://github.com/apache/cassandra-dtest/tree/master/upgrade_tests]]).
I frame as inadequate because they didn't catch a bunch of the things that had
sharp edges in the StorageEngine rewrite so clearly our mixed version cluster
testing wasn't as robust as we'd hoped.
Looks like we have a candidate to build from in UpgradeTestBase.java we could
start to specifically flesh out if we had a PoV on things to test. I'd advocate
for us building more there than investing further in dtests.
So: long winded way to say "Hm. Not sure what we should do here."
[~jjirsa] - got any ideas in terms of a straw man proposal of things we should
test on mixed version clusters from a unit perspective, or is integration the
way to go here?
> 4.0 quality testing: Cluster Upgrade
> ------------------------------------
>
> Key: CASSANDRA-15588
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15588
> Project: Cassandra
> Issue Type: Task
> Components: Test/dtest/java, Test/dtest/python
> Reporter: Josh McKenzie
> Priority: Normal
> Fix For: 4.0-beta, 4.0-triage
>
>
> We've historically had numerous bugs concerning upgrading clusters from one
> version to the other. Let's establish the supported upgrade path and ensure
> that users can safely perform the upgrades in production.
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