d01cc16d1e
Intended for testing, or hot-fixing out-of-space issues in production. Tablet load balancer uses this information for determining per-shard load so reducing capacity will cause tablets to be migrated away from the node.
99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/*
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* Copyright (C) 2024-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#pragma once
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#include <filesystem>
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#include <any>
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#include <boost/signals2/connection.hpp>
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#include <boost/signals2/signal_type.hpp>
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#include <boost/signals2/dummy_mutex.hpp>
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#include <seastar/core/abort_source.hh>
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#include <seastar/core/future.hh>
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#include <seastar/core/lowres_clock.hh>
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#include <seastar/util/optimized_optional.hh>
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#include <seastar/core/condition-variable.hh>
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#include "seastarx.hh"
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#include "utils/updateable_value.hh"
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#include "utils/phased_barrier.hh"
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namespace utils {
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// Instantiated only on shard 0
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class disk_space_monitor {
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public:
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using clock_type = lowres_clock;
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using signal_type = boost::signals2::signal_type<void (), boost::signals2::keywords::mutex_type<boost::signals2::dummy_mutex>>::type;
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using signal_callback_type = std::function<future<>(const disk_space_monitor&)>;
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using signal_connection_type = boost::signals2::scoped_connection;
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using space_source_fn = std::function<future<std::filesystem::space_info>()>;
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struct config {
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scheduling_group sched_group;
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updateable_value<int> normal_polling_interval;
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updateable_value<int> high_polling_interval;
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// Use high_polling_interval above this threshold
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updateable_value<float> polling_interval_threshold;
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updateable_value<uint64_t> capacity_override; // 0 means no override.
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};
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private:
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abort_source _as;
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optimized_optional<abort_source::subscription> _as_sub;
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future<> _poller_fut = make_ready_future();
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condition_variable _poll_cv;
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utils::phased_barrier _signal_barrier;
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signal_type _signal_source;
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std::filesystem::space_info _space_info;
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std::filesystem::path _data_dir;
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config _cfg;
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space_source_fn _space_source;
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std::any _capacity_observer;
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public:
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disk_space_monitor(abort_source& as, std::filesystem::path data_dir, config cfg);
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~disk_space_monitor();
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future<> start();
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future<> stop() noexcept;
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const std::filesystem::path& data_dir() const noexcept {
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return _data_dir;
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}
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std::filesystem::space_info space() const noexcept {
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return _space_info;
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}
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float disk_utilization() const noexcept {
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return _space_info.capacity ? (float)(_space_info.capacity - _space_info.available) / _space_info.capacity : -1;
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}
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signal_connection_type listen(signal_callback_type callback);
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// Replaces default way of obtaining file system usage information.
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void set_space_source(space_source_fn space_source) {
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_space_source = std::move(space_source);
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}
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void trigger_poll() noexcept;
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private:
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future<> poll();
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future<std::filesystem::space_info> get_filesystem_space();
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clock_type::duration get_polling_interval() const noexcept;
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};
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} // namespace utils
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