control-connection: keep zero-token hosts#855
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Track zero-token status during topology refreshes and rebuild routing state when nodes gain tokens. Filter zero-token hosts from default load balancing policies while preserving explicit whitelist behavior.
Clear host addition state when pool creation aborts after a partial async start. Keep zero-token filtering compatible with child policies that only implement the public load-balancing API.
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Summary
Tests
uv run python -m pytest -q tests/unit/test_cluster.py::ClusterTest::test_on_add_excludes_host_from_query_plan_until_pool_futures_complete tests/unit/test_cluster.py::ClusterTest::test_on_up_excludes_host_from_query_plan_until_pool_futures_completeuv run python -m pytest -q tests/unit/test_cluster.py tests/unit/test_policies.py tests/unit/test_control_connection.py