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bcbcc18aa1
Loading snapshot id and term + vote involve selecting static fields from the "system.raft" table, constrained by a given group id. The code incorrectly assumes that, for example, `SELECT snapshot_id FROM raft WHERE group_id=?` in `load_snapshot` always returns only one row. This is not true, since this will return a row for each (pk, ck) combination, which is (group_id, index) for "system.raft" table. The same applies for the `load_term_and_vote`, which selects static `vote_term` and `vote` from "system.raft". This results in a crash at node startup when there is a non-empty raft log containing more than one entry for a given `group_id`. Restrict the selection to always return one row by applying `LIMIT 1` clause. Tests: unit(dev) Signed-off-by: Pavel Solodovnikov <pa.solodovnikov@scylladb.com> Message-Id: <20210723183232.742083-1-pa.solodovnikov@scylladb.com>