c001374636
C++20 introduced `contains` member functions for maps and sets for checking whether an element is present in the collection. Previously `count` function was often used in various ways. `contains` does not only express the intend of the code better but also does it in more unified way. This commit replaces all the occurences of the `count` with the `contains`. Tests: unit(dev) Signed-off-by: Piotr Jastrzebski <piotr@scylladb.com> Message-Id: <b4ef3b4bc24f49abe04a2aba0ddd946009c9fcb2.1597314640.git.piotr@scylladb.com>
387 lines
17 KiB
C++
387 lines
17 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Modified by ScyllaDB
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* Copyright (C) 2015 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "dht/range_streamer.hh"
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#include "utils/fb_utilities.hh"
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#include "locator/snitch_base.hh"
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#include "database.hh"
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#include "gms/gossiper.hh"
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#include "gms/failure_detector.hh"
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#include "log.hh"
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#include "streaming/stream_plan.hh"
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#include "streaming/stream_state.hh"
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#include "service/storage_service.hh"
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#include "db/config.hh"
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#include <seastar/core/semaphore.hh>
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#include <boost/range/adaptors.hpp>
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namespace dht {
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logging::logger logger("range_streamer");
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using inet_address = gms::inet_address;
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std::unordered_map<inet_address, dht::token_range_vector>
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range_streamer::get_range_fetch_map(const std::unordered_map<dht::token_range, std::vector<inet_address>>& ranges_with_sources,
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const std::unordered_set<std::unique_ptr<i_source_filter>>& source_filters,
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const sstring& keyspace) {
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std::unordered_map<inet_address, dht::token_range_vector> range_fetch_map_map;
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for (auto x : ranges_with_sources) {
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const dht::token_range& range_ = x.first;
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const std::vector<inet_address>& addresses = x.second;
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bool found_source = false;
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for (auto address : addresses) {
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if (address == utils::fb_utilities::get_broadcast_address()) {
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// If localhost is a source, we have found one, but we don't add it to the map to avoid streaming locally
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found_source = true;
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continue;
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}
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auto filtered = false;
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for (const auto& filter : source_filters) {
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if (!filter->should_include(address)) {
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filtered = true;
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break;
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}
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}
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if (filtered) {
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logger.debug("In get_range_fetch_map, keyspace = {}, endpoint= {} is filtered", keyspace, address);
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continue;
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}
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range_fetch_map_map[address].push_back(range_);
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found_source = true;
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break; // ensure we only stream from one other node for each range
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}
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if (!found_source) {
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auto& ks = _db.local().find_keyspace(keyspace);
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auto rf = ks.get_replication_strategy().get_replication_factor();
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// When a replacing node replaces a dead node with keyspace of RF
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// 1, it is expected that replacing node could not find a peer node
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// that contains data to stream from.
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if (_reason == streaming::stream_reason::replace && rf == 1) {
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logger.warn("Unable to find sufficient sources to stream range {} for keyspace {} with RF = 1 for replace operation", range_, keyspace);
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} else {
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throw std::runtime_error(format("unable to find sufficient sources for streaming range {} in keyspace {}", range_, keyspace));
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}
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}
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}
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return range_fetch_map_map;
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}
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std::unordered_map<dht::token_range, std::vector<inet_address>>
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range_streamer::get_all_ranges_with_sources_for(const sstring& keyspace_name, dht::token_range_vector desired_ranges) {
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logger.debug("{} ks={}", __func__, keyspace_name);
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auto& ks = _db.local().find_keyspace(keyspace_name);
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auto& strat = ks.get_replication_strategy();
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auto tm = _metadata.clone_only_token_map();
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auto range_addresses = strat.get_range_addresses(tm);
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logger.debug("keyspace={}, desired_ranges.size={}, range_addresses.size={}", keyspace_name, desired_ranges.size(), range_addresses.size());
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std::unordered_map<dht::token_range, std::vector<inet_address>> range_sources;
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auto& snitch = locator::i_endpoint_snitch::get_local_snitch_ptr();
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for (auto& desired_range : desired_ranges) {
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auto found = false;
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for (auto& x : range_addresses) {
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if (need_preempt()) {
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seastar::thread::yield();
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}
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const range<token>& src_range = x.first;
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if (src_range.contains(desired_range, dht::tri_compare)) {
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std::vector<inet_address>& addresses = x.second;
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auto preferred = snitch->get_sorted_list_by_proximity(_address, addresses);
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for (inet_address& p : preferred) {
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range_sources[desired_range].push_back(p);
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}
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found = true;
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}
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}
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if (!found) {
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throw std::runtime_error(format("No sources found for {}", desired_range));
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}
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}
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return range_sources;
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}
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std::unordered_map<dht::token_range, std::vector<inet_address>>
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range_streamer::get_all_ranges_with_strict_sources_for(const sstring& keyspace_name, dht::token_range_vector desired_ranges) {
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logger.debug("{} ks={}", __func__, keyspace_name);
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assert (_tokens.empty() == false);
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auto& ks = _db.local().find_keyspace(keyspace_name);
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auto& strat = ks.get_replication_strategy();
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//Active ranges
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auto metadata_clone = _metadata.clone_only_token_map();
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auto range_addresses = strat.get_range_addresses(metadata_clone);
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//Pending ranges
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metadata_clone.update_normal_tokens(_tokens, _address);
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auto pending_range_addresses = strat.get_range_addresses(metadata_clone);
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//Collects the source that will have its range moved to the new node
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std::unordered_map<dht::token_range, std::vector<inet_address>> range_sources;
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logger.debug("keyspace={}, desired_ranges.size={}, range_addresses.size={}", keyspace_name, desired_ranges.size(), range_addresses.size());
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for (auto& desired_range : desired_ranges) {
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for (auto& x : range_addresses) {
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const range<token>& src_range = x.first;
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if (need_preempt()) {
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seastar::thread::yield();
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}
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if (src_range.contains(desired_range, dht::tri_compare)) {
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std::vector<inet_address> old_endpoints(x.second.begin(), x.second.end());
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auto it = pending_range_addresses.find(desired_range);
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if (it == pending_range_addresses.end()) {
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throw std::runtime_error(format("Can not find desired_range = {} in pending_range_addresses", desired_range));
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}
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std::unordered_set<inet_address> new_endpoints(it->second.begin(), it->second.end());
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//Due to CASSANDRA-5953 we can have a higher RF then we have endpoints.
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//So we need to be careful to only be strict when endpoints == RF
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if (old_endpoints.size() == strat.get_replication_factor()) {
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std::erase_if(old_endpoints,
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[&new_endpoints] (inet_address ep) { return new_endpoints.contains(ep); });
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if (old_endpoints.size() != 1) {
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throw std::runtime_error(format("Expected 1 endpoint but found {:d}", old_endpoints.size()));
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}
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}
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range_sources[desired_range].push_back(old_endpoints.front());
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}
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}
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//Validate
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auto it = range_sources.find(desired_range);
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if (it == range_sources.end()) {
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throw std::runtime_error(format("No sources found for {}", desired_range));
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}
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if (it->second.size() != 1) {
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throw std::runtime_error(format("Multiple endpoints found for {}", desired_range));
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}
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inet_address source_ip = it->second.front();
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auto& gossiper = gms::get_local_gossiper();
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if (gossiper.is_enabled() && !gossiper.is_alive(source_ip)) {
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throw std::runtime_error(format("A node required to move the data consistently is down ({}). If you wish to move the data from a potentially inconsistent replica, restart the node with consistent_rangemovement=false", source_ip));
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}
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}
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return range_sources;
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}
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bool range_streamer::use_strict_sources_for_ranges(const sstring& keyspace_name) {
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auto& ks = _db.local().find_keyspace(keyspace_name);
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auto& strat = ks.get_replication_strategy();
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return !_db.local().is_replacing()
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&& use_strict_consistency()
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&& !_tokens.empty()
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&& _metadata.get_all_endpoints().size() != strat.get_replication_factor();
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}
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void range_streamer::add_tx_ranges(const sstring& keyspace_name, std::unordered_map<inet_address, dht::token_range_vector> ranges_per_endpoint) {
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if (_nr_rx_added) {
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throw std::runtime_error("Mixed sending and receiving is not supported");
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}
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_nr_tx_added++;
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_to_stream.emplace(keyspace_name, std::move(ranges_per_endpoint));
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}
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void range_streamer::add_rx_ranges(const sstring& keyspace_name, std::unordered_map<inet_address, dht::token_range_vector> ranges_per_endpoint) {
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if (_nr_tx_added) {
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throw std::runtime_error("Mixed sending and receiving is not supported");
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}
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_nr_rx_added++;
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_to_stream.emplace(keyspace_name, std::move(ranges_per_endpoint));
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}
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// TODO: This is the legacy range_streamer interface, it is add_rx_ranges which adds rx ranges.
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future<> range_streamer::add_ranges(const sstring& keyspace_name, dht::token_range_vector ranges) {
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return seastar::async([this, keyspace_name, ranges= std::move(ranges)] () mutable {
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if (_nr_tx_added) {
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throw std::runtime_error("Mixed sending and receiving is not supported");
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}
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_nr_rx_added++;
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auto ranges_for_keyspace = use_strict_sources_for_ranges(keyspace_name)
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? get_all_ranges_with_strict_sources_for(keyspace_name, ranges)
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: get_all_ranges_with_sources_for(keyspace_name, ranges);
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if (logger.is_enabled(logging::log_level::debug)) {
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for (auto& x : ranges_for_keyspace) {
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logger.debug("{} : keyspace {} range {} exists on {}", _description, keyspace_name, x.first, x.second);
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}
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}
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std::unordered_map<inet_address, dht::token_range_vector> range_fetch_map = get_range_fetch_map(ranges_for_keyspace, _source_filters, keyspace_name);
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if (logger.is_enabled(logging::log_level::debug)) {
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for (auto& x : range_fetch_map) {
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logger.debug("{} : keyspace={}, ranges={} from source={}, range_size={}", _description, keyspace_name, x.second, x.first, x.second.size());
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}
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}
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_to_stream.emplace(keyspace_name, std::move(range_fetch_map));
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});
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}
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future<> range_streamer::stream_async() {
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return seastar::async([this] {
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int sleep_time = 60;
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for (;;) {
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try {
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do_stream_async().get();
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break;
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} catch (...) {
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logger.warn("{} failed to stream. Will retry in {} seconds ...", _description, sleep_time);
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sleep_abortable(std::chrono::seconds(sleep_time), _abort_source).get();
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sleep_time *= 1.5;
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if (++_nr_retried >= _nr_max_retry) {
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throw;
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}
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}
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}
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});
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}
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future<> range_streamer::do_stream_async() {
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auto nr_ranges_remaining = nr_ranges_to_stream();
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logger.info("{} starts, nr_ranges_remaining={}", _description, nr_ranges_remaining);
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auto start = lowres_clock::now();
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return do_for_each(_to_stream, [this, start, description = _description] (auto& stream) {
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const auto& keyspace = stream.first;
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auto& ip_range_vec = stream.second;
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auto ips = boost::copy_range<std::list<inet_address>>(ip_range_vec | boost::adaptors::map_keys);
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// Fetch from or send to peer node in parallel
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logger.info("{} with {} for keyspace={} started, nodes_to_stream={}", description, ips, keyspace, ip_range_vec.size());
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return parallel_for_each(ip_range_vec, [this, description, keyspace] (auto& ip_range) {
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auto& source = ip_range.first;
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auto& range_vec = ip_range.second;
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return seastar::with_semaphore(_limiter, 1, [this, description, keyspace, source, &range_vec] () mutable {
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return seastar::async([this, description, keyspace, source, &range_vec] () mutable {
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// TODO: It is better to use fiber instead of thread here because
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// creating a thread per peer can be some memory in a large cluster.
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auto start_time = lowres_clock::now();
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unsigned sp_index = 0;
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unsigned nr_ranges_streamed = 0;
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size_t nr_ranges_total = range_vec.size();
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size_t nr_ranges_per_stream_plan = nr_ranges_total / 10;
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dht::token_range_vector ranges_to_stream;
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auto do_streaming = [&] {
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auto sp = stream_plan(format("{}-{}-index-{:d}", description, keyspace, sp_index++), _reason);
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auto abort_listener = _abort_source.subscribe([&] () noexcept { sp.abort(); });
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_abort_source.check();
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logger.info("{} with {} for keyspace={}, streaming [{}, {}) out of {} ranges",
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description, source, keyspace,
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nr_ranges_streamed, nr_ranges_streamed + ranges_to_stream.size(), nr_ranges_total);
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nr_ranges_streamed += ranges_to_stream.size();
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if (_nr_rx_added) {
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sp.request_ranges(source, keyspace, ranges_to_stream);
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} else if (_nr_tx_added) {
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sp.transfer_ranges(source, keyspace, ranges_to_stream);
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}
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sp.execute().discard_result().get();
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ranges_to_stream.clear();
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};
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try {
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for (auto it = range_vec.begin(); it < range_vec.end();) {
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ranges_to_stream.push_back(*it);
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it = range_vec.erase(it);
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if (ranges_to_stream.size() < nr_ranges_per_stream_plan) {
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continue;
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} else {
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do_streaming();
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}
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}
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if (ranges_to_stream.size() > 0) {
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do_streaming();
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}
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} catch (...) {
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for (auto& range : ranges_to_stream) {
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range_vec.push_back(range);
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}
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auto t = std::chrono::duration_cast<std::chrono::duration<float>>(lowres_clock::now() - start_time).count();
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logger.warn("{} with {} for keyspace={} failed, took {} seconds: {}", description, source, keyspace, t, std::current_exception());
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throw;
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}
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auto t = std::chrono::duration_cast<std::chrono::duration<float>>(lowres_clock::now() - start_time).count();
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logger.info("{} with {} for keyspace={} succeeded, took {} seconds", description, source, keyspace, t);
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});
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});
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});
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}).finally([this, start] {
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auto t = std::chrono::duration_cast<std::chrono::seconds>(lowres_clock::now() - start).count();
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auto nr_ranges_remaining = nr_ranges_to_stream();
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if (nr_ranges_remaining) {
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logger.warn("{} failed, took {} seconds, nr_ranges_remaining={}", _description, t, nr_ranges_remaining);
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} else {
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logger.info("{} succeeded, took {} seconds, nr_ranges_remaining={}", _description, t, nr_ranges_remaining);
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}
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});
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}
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size_t range_streamer::nr_ranges_to_stream() {
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size_t nr_ranges_remaining = 0;
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for (auto& fetch : _to_stream) {
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const auto& keyspace = fetch.first;
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auto& ip_range_vec = fetch.second;
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for (auto& ip_range : ip_range_vec) {
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auto& source = ip_range.first;
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auto& range_vec = ip_range.second;
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nr_ranges_remaining += range_vec.size();
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logger.debug("Remaining: keyspace={}, source={}, ranges={}", keyspace, source, range_vec);
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}
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}
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return nr_ranges_remaining;
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}
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bool range_streamer::use_strict_consistency() {
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return service::get_local_storage_service().db().local().get_config().consistent_rangemovement();
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}
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} // dht
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