7952200c8c
"me" format sstables were introduced in d370558279 (Jan 2022; 5.1)
and so can be assumed always present. The listener that checks when
the cluster understands ME_SSTABLE was removed and in its place
we default to sstable_version_types::me (and call on_enabled()
immediately).
82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
/*
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* Copyright (C) 2020-present ScyllaDB
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*
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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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#pragma once
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#include <seastar/core/semaphore.hh>
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#include <seastar/core/future.hh>
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#include <seastar/core/gate.hh>
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#include <seastar/core/sharded.hh>
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#include "sstables/version.hh"
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#include "gms/feature.hh"
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using namespace seastar;
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namespace replica {
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class database;
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}
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namespace gms {
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class gossiper;
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class feature_service;
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}
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namespace db {
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class system_keyspace;
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class sstables_format_listener;
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class feature_enabled_listener : public gms::feature::listener {
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sstables_format_listener& _listener;
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sstables::sstable_version_types _format;
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public:
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feature_enabled_listener(sstables_format_listener& l, sstables::sstable_version_types format)
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: _listener(l)
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, _format(format)
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{ }
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void on_enabled() override;
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};
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class sstables_format_selector {
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sharded<replica::database>& _db;
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db::system_keyspace* _sys_ks = nullptr;
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sstables::sstable_version_types _selected_format = sstables::sstable_version_types::me;
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future<> select_format(sstables::sstable_version_types new_format);
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future<> read_sstables_format();
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public:
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explicit sstables_format_selector(sharded<replica::database>& db);
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future<> on_system_tables_loaded(db::system_keyspace& sys_ks);
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inline sstables::sstable_version_types selected_format() const noexcept {
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return _selected_format;
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}
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future<> update_format(sstables::sstable_version_types new_format);
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};
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class sstables_format_listener {
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gms::gossiper& _gossiper;
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sharded<gms::feature_service>& _features;
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sstables_format_selector& _selector;
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seastar::named_semaphore _sem = {1, named_semaphore_exception_factory{"feature listeners"}};
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seastar::gate _sel;
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feature_enabled_listener _me_feature_listener;
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public:
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sstables_format_listener(gms::gossiper& g, sharded<gms::feature_service>& f, sstables_format_selector& selector);
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future<> start();
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future<> stop();
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future<> maybe_select_format(sstables::sstable_version_types new_format);
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};
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} // namespace sstables
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