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Suppose we have a multi-dc setup (e.g. 9 nodes distributed across
3 datacenters: [dc1, dc2, dc3] -> [3, 3, 3]).
When a query that uses LWT is executed with LOCAL_SERIAL consistency
level, the `storage_proxy::get_paxos_participants` function
incorrectly calculates the number of required participants to serve
the query.
In the example above it's calculated to be 5 (i.e. the number of
nodes needed for a regular QUORUM) instead of 2 (for LOCAL_SERIAL,
which is equivalent to LOCAL_QUORUM cl in this case).
This behavior results in an exception being thrown when executing
the following query with LOCAL_SERIAL cl:
INSERT INTO users (userid, firstname, lastname, age) VALUES (0, 'first0', 'last0', 30) IF NOT EXISTS
Unavailable: Error from server: code=1000 [Unavailable exception] message="Cannot achieve consistency level for cl LOCAL_SERIAL. Requires 5, alive 3" info={'required_replicas': 5, 'alive_replicas': 3, 'consistency': 'LOCAL_SERIAL'}
Tests: unit(dev), dtest(consistency_test.py)
Fixes #5477.
Signed-off-by: Pavel Solodovnikov <pa.solodovnikov@scylladb.com>
Message-Id: <20191216151732.64230-1-pa.solodovnikov@scylladb.com>
(cherry picked from commit c451f6d82a)