Aleksey Yeschenko created CASSANDRA-8049:
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Summary: Explicitly examine current C* state on startup to detect
incompatibilities before upgrade
Key: CASSANDRA-8049
URL: https://issues.apache.org/jira/browse/CASSANDRA-8049
Project: Cassandra
Issue Type: Bug
Reporter: Aleksey Yeschenko
Fix For: 3.0
Unfortunately, we cannot rely on users reading, and following, NEWS.txt before
upgrading. People don't read, or ignore it, and sometimes have issues as the
result (see CASSANDRA-8047, for example, and I know of several cases like that
one).
We should add an explicit compatibility check on startup, before we modify
anything, or write out sstables with the new format. We should fail and
complain loudly if we detect a skipped upgrade step.
We should also snapshot the schema tables before attempting any conversions
(since it's not uncommon to make schema modifications as part of the upgrade).
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