ad8a9104d8
Rather than calling on_change for each particular application_state, pass an endpoint_state::map_type with all changed states, to be processed as a batch. In particular, thise allows storage_service::on_change to update_peer_info once for all changed states. Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
105 lines
2.7 KiB
C++
105 lines
2.7 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: (AGPL-3.0-or-later and Apache-2.0)
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*/
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#pragma once
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#include <sstream>
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#include <string>
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#include <chrono>
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#include <optional>
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#include "production_snitch_base.hh"
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#include "exceptions/exceptions.hh"
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#include <seastar/core/file.hh>
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#include "log.hh"
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namespace locator {
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/**
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* cassandra-rackdc.properties file has the following format:
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*
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* dc=<Data Center name>
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* rack=<Rack name>
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* prefer_local=<true|false>
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*/
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class gossiping_property_file_snitch : public production_snitch_base {
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public:
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// Check the property file for changes every 60s.
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static constexpr timer<lowres_clock>::duration reload_property_file_period() {
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return std::chrono::seconds(60);
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}
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virtual gms::application_state_map get_app_states() const override;
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virtual future<> stop() override;
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virtual future<> start() override;
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virtual future<> pause_io() override;
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virtual void resume_io() override;
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virtual sstring get_name() const override {
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return "org.apache.cassandra.locator.GossipingPropertyFileSnitch";
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}
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gossiping_property_file_snitch(const snitch_config&);
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virtual snitch_signal_connection_t when_reconfigured(snitch_signal_slot_t& slot) override {
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return _reconfigured.connect([slot = std::move(slot)] () mutable {
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// the signal is fired inside thread context
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slot().get();
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});
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}
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private:
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void periodic_reader_callback();
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/**
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* Parse the property file and indicate the StorageService and a Gossiper if
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* there was a configuration change.
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*
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* @return a ready-future when we are done
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*/
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future<> reload_configuration();
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/**
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* Check if the property file has been modified since the last time we
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* parsed it.
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*
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* @return TRUE if property file has been modified
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*/
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future<bool> property_file_was_modified();
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/**
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* Read the property file if it has changed since the last time we read it.
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*/
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future<> read_property_file();
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/**
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* Indicate that the snitch has stopped its I/O.
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*/
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void set_stopped();
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future<> stop_io();
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void start_io();
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private:
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timer<lowres_clock> _file_reader;
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std::optional<timespec> _last_file_mod;
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std::istringstream _istrm;
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bool _file_reader_runs = false;
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unsigned _file_reader_cpu_id;
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snitch_signal_t _reconfigured;
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promise<> _io_is_stopped;
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std::optional<gms::inet_address> _listen_address;
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void reset_io_state() {
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// Reset the promise to allow repeating
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// start()+stop()/pause_io()+resume_io() call sequences.
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_io_is_stopped = promise<>();
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}
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};
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} // namespace locator
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