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042303f0c9
Before this series, Alternator's CreateTable operation defaults to creating a table replicated with vnodes, not tablets. The reasons for this default included missing support for LWT, Materialized Views, Alternator TTL and Alternator Streams if tablets are used. But today, all of these (except the still-experimental Alternator Streams) are now fully available with tablets, so we are finally ready to switch Alternator to use tablets by default in new tables. We will use the same configuration parameter that CQL uses, tablets_mode_for_new_keyspaces, to determine whether new keyspaces use tablets by default. If set to `enabled`, tablets are used by default on new tables. If set to `disabled`, tablets will not be used by default (i.e., vnodes will be used, as before). A third value, `enforced` is similar to `enabled` but forbids overriding the default to vnodes when creating a table. As before, the user can set a tag during the CreateTable operation to override the default choice of tablets or vnodes (unless in `enforced` mode). This tag is now named `system:initial_tablets` - whereas before this patch it was called `experimental:initial_tablets`. The rules stay the same as with the earlier, experimental:initial_tablets tag: when supplied with a numeric value, the table will use tablets. When supplied with something else (like a string "none"), the table will use vnodes. Fixes https://github.com/scylladb/scylladb/issues/22463 Backport to 2025.4, it's important not to delay phasing out vnodes. Closes scylladb/scylladb#26836 * github.com:scylladb/scylladb: test,alternator: use 3-rack clusters in tests alternator: improve error in tablets_mode_for_new_keyspaces=enforced config: make tablets_mode_for_new_keyspaces live-updatable alternator: improve comment about non-hidden system tags alternator: Fix test_ttl_expiration_streams() alternator: Fix test_scan_paging_missing_limit() alternator: Don't require vnodes for TTL tests alternator: Remove obsolete test from test_table.py alternator: Fix tag name to request vnodes alternator: Fix test name clash in test_tablets.py alternator: test_tablets.py handles new policy reg. tablets alternator: Update doc regarding tablets support alternator: Support `tablets_mode_for_new_keyspaces` config flag Fix incorrect hint for tablets_mode_for_new_keyspaces Fix comment for tablets_mode_for_new_keyspaces