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64 lines
3.0 KiB
C++
64 lines
3.0 KiB
C++
/*
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*
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* Modified by ScyllaDB
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: (LicenseRef-ScyllaDB-Source-Available-1.1 and Apache-2.0)
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*/
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#include "locator/everywhere_replication_strategy.hh"
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#include "utils/class_registrator.hh"
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#include "locator/token_metadata.hh"
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#include "exceptions/exceptions.hh"
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namespace locator {
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everywhere_replication_strategy::everywhere_replication_strategy(replication_strategy_params params, const locator::topology*) :
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abstract_replication_strategy(params, replication_strategy_type::everywhere_topology) {
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_natural_endpoints_depend_on_token = false;
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}
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future<host_id_set> everywhere_replication_strategy::calculate_natural_endpoints(const token& search_token, const token_metadata& tm) const {
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if (tm.sorted_tokens().empty()) {
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host_id_set result{host_id_vector_replica_set({tm.get_topology().my_host_id()})};
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return make_ready_future<host_id_set>(std::move(result));
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}
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const auto& all_endpoints = tm.get_normal_token_owners();
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return make_ready_future<host_id_set>(host_id_set(all_endpoints.begin(), all_endpoints.end()));
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}
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size_t everywhere_replication_strategy::get_replication_factor(const token_metadata& tm) const {
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return tm.sorted_tokens().empty() ? 1 : tm.count_normal_token_owners();
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}
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void everywhere_replication_strategy::validate_options(const gms::feature_service&, const locator::topology&) const {
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if (_uses_tablets) {
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throw exceptions::configuration_exception("EverywhereStrategy doesn't support tablet replication");
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}
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}
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sstring everywhere_replication_strategy::sanity_check_read_replicas(const effective_replication_map& erm, const host_id_vector_replica_set& read_replicas) const {
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const auto replication_factor = erm.get_replication_factor();
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if (const auto& topo_info = erm.get_token_metadata().get_topology_change_info(); topo_info && topo_info->read_new) {
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if (read_replicas.size() > replication_factor + 1) {
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return seastar::format(
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"everywhere_replication_strategy: the number of replicas for everywhere_replication_strategy is {}, "
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"cannot be higher than replication factor {} + 1 during the 'read from new replicas' stage of a topology change",
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read_replicas.size(), replication_factor);
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}
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} else if (read_replicas.size() > replication_factor) {
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return seastar::format("everywhere_replication_strategy: the number of replicas for everywhere_replication_strategy is {}, cannot be higher than replication factor {}", read_replicas.size(), replication_factor);
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}
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return {};
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}
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// Note: signature must match the class_registry signature defined and used by abstract_replication_strategy::to_qualified_class_name
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using registry = class_registrator<abstract_replication_strategy, everywhere_replication_strategy, replication_strategy_params, const locator::topology*>;
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static registry registrator("org.apache.cassandra.locator.EverywhereStrategy");
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static registry registrator_short_name("EverywhereStrategy");
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}
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