89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
/*
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#include <algorithm>
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#include <seastar/core/coroutine.hh>
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#include <seastar/coroutine/maybe_yield.hh>
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#include "simple_strategy.hh"
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#include "utils/class_registrator.hh"
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#include <boost/algorithm/string.hpp>
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#include "utils/sequenced_set.hh"
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namespace locator {
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simple_strategy::simple_strategy(const replication_strategy_config_options& config_options) :
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abstract_replication_strategy(config_options, replication_strategy_type::simple) {
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for (auto& config_pair : config_options) {
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auto& key = config_pair.first;
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auto& val = config_pair.second;
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if (boost::iequals(key, "replication_factor")) {
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validate_replication_factor(val);
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_replication_factor = std::stol(val);
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break;
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}
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}
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}
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future<natural_ep_type> simple_strategy::calculate_natural_endpoints(const token& t, const token_metadata& tm, bool use_host_id) const {
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return select_tm([&]<typename NodeId>(const generic_token_metadata<NodeId>& tm) -> future<natural_ep_type> {
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const std::vector<token>& tokens = tm.sorted_tokens();
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if (tokens.empty()) {
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co_return set_type<NodeId>{};
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}
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size_t replicas = _replication_factor;
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set_type<NodeId> endpoints;
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endpoints.reserve(replicas);
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for (auto& token : tm.ring_range(t)) {
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// If the number of nodes in the cluster is smaller than the desired
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// replication factor we should return the loop when endpoints already
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// contains all the nodes in the cluster because no more nodes could be
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// added to endpoints lists.
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if (endpoints.size() == replicas || endpoints.size() == tm.count_normal_token_owners()) {
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break;
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}
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auto ep = tm.get_endpoint(token);
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assert(ep);
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endpoints.push_back(*ep);
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co_await coroutine::maybe_yield();
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}
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co_return endpoints;
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}, tm, use_host_id);
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}
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size_t simple_strategy::get_replication_factor(const token_metadata&) const {
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return _replication_factor;
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}
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void simple_strategy::validate_options(const gms::feature_service&) const {
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auto it = _config_options.find("replication_factor");
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if (it == _config_options.end()) {
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throw exceptions::configuration_exception("SimpleStrategy requires a replication_factor strategy option.");
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}
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validate_replication_factor(it->second);
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}
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std::optional<std::unordered_set<sstring>>simple_strategy::recognized_options(const topology&) const {
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return {{ "replication_factor" }};
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}
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using registry = class_registrator<abstract_replication_strategy, simple_strategy, const replication_strategy_config_options&>;
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static registry registrator("org.apache.cassandra.locator.SimpleStrategy");
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static registry registrator_short_name("SimpleStrategy");
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}
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