"Currently new nodes calculate digests based on v3 schema mutations,
which are very different from v2 mutations. As a result they will
use schemas with different table_schema_version that the old nodes.
The old nodes will not recognize the version and will try to request
its definition. That will fail, because old nodes don't understand
v3 schema mutations.
To fix this problem, let's preserve the digests during migration,
so that they're the same on new and old nodes. This will allow
requests to proceed as usual.
This does not solve the problem of schema being changed during
the rolling upgrade. This is not allowed, as it would bring the
same problem back.
Fixes #2549."
* tag 'tgrabiec/use-consistent-schema-table-digests-v2' of github.com:cloudius-systems/seastar-dev:
tests: Add test for concurrent column addition
legacy_schema_migrator: Set digest to one compatible with the old nodes
schema_tables: Persist table_schema_version
schema_tables: Introduce system_schema.scylla_tables
schema_tables: Simplify read_table_mutations()
schema_tables: Resurrect v2 read_table_mutations()
system_keyspace: Forward-declare legacy schemas
legacy_schema_migrator: Take storage_proxy as dependency
(cherry picked from commit a397889c81)
00b9640b2c