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b1cf1890a9
In commitc24bc3bwe decided that creating a new table in Alternator will by default use vnodes - not tablets - because of all the missing features in our tablets implementation that are important for Alternator, namely - LWT, CDC and Alternator TTL. We never documented this, or the fact that we support a tag `experimental:initial_tablets` which allows to override this decision and create an Alternator table using tablets. We also never documented what exactly doesn't work when Alternator uses tablet. This patch adds the missing documentation in docs/alternator/new-apis.md (which is a good place for describing the `experimental:initial_tablets` tag). The patch also adds a new test file, test_tablets.py, which includes tests for all the statements made in the document regarding how `experimental:initial_tablets` works and what works or doesn't work when tablets are enabled. Two existing tests - for TTL and Streams non-support with tablets - are moved to the new test file. When the tablets feature will finally be completed, both the document and the tests will need to be modified (some of the tests should be outright deleted). But it seems this will not happen for at least several months, and that is too long to wait without accurate documentation. Fixes #21629 Signed-off-by: Nadav Har'El <nyh@scylladb.com> Closes scylladb/scylladb#22462 (cherry picked from commitc0821842de) Closes scylladb/scylladb#23298