mirror of
https://github.com/scylladb/scylladb.git
synced 2026-04-25 19:10:42 +00:00
f3eade2f62
Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
/*
|
|
* Copyright (C) 2016-present ScyllaDB
|
|
*/
|
|
|
|
/*
|
|
* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "replica/database_fwd.hh"
|
|
#include "schema/schema_fwd.hh"
|
|
#include <seastar/core/timer.hh>
|
|
#include <seastar/core/sharded.hh>
|
|
|
|
using namespace seastar;
|
|
|
|
namespace gms { class gossiper; }
|
|
|
|
namespace service {
|
|
|
|
class cache_hitrate_calculator : public seastar::async_sharded_service<cache_hitrate_calculator>, public seastar::peering_sharded_service<cache_hitrate_calculator> {
|
|
struct stat {
|
|
float h = 0;
|
|
float m = 0;
|
|
stat& operator+=(stat& o) {
|
|
h += o.h;
|
|
m += o.m;
|
|
return *this;
|
|
}
|
|
};
|
|
|
|
seastar::sharded<replica::database>& _db;
|
|
gms::gossiper& _gossiper;
|
|
timer<lowres_clock> _timer;
|
|
bool _stopped = false;
|
|
float _diff = 0;
|
|
std::unordered_map<table_id, stat> _rates;
|
|
size_t _slen = 0;
|
|
std::string _gstate;
|
|
uint64_t _published_nr = 0;
|
|
lowres_clock::time_point _published_time;
|
|
future<> _done = make_ready_future();
|
|
|
|
future<lowres_clock::duration> recalculate_hitrates();
|
|
void recalculate_timer();
|
|
public:
|
|
cache_hitrate_calculator(seastar::sharded<replica::database>& db, gms::gossiper& g);
|
|
void run_on(size_t master, lowres_clock::duration d = std::chrono::milliseconds(2000));
|
|
|
|
future<> stop();
|
|
};
|
|
|
|
}
|