69a385fd9d
Schema related files are moved there. This excludes schema files that also interact with mutations, because the mutation module depends on the schema. Those files will have to go into a separate module. Closes #12858
127 lines
4.8 KiB
C++
127 lines
4.8 KiB
C++
/*
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* Copyright (C) 2018-present ScyllaDB
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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 "bytes.hh"
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#include "schema/schema_fwd.hh"
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#include "service/qos/qos_common.hh"
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#include "utils/UUID.hh"
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#include "cdc/generation_id.hh"
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#include "locator/host_id.hh"
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#include <seastar/core/future.hh>
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#include <seastar/core/sstring.hh>
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#include <unordered_map>
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namespace cql3 {
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class query_processor;
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}
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namespace cdc {
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class stream_id;
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class topology_description;
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class streams_version;
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} // namespace cdc
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namespace service {
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class storage_proxy;
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class migration_manager;
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}
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namespace db {
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class system_distributed_keyspace {
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public:
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static constexpr auto NAME = "system_distributed";
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static constexpr auto NAME_EVERYWHERE = "system_distributed_everywhere";
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static constexpr auto VIEW_BUILD_STATUS = "view_build_status";
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static constexpr auto SERVICE_LEVELS = "service_levels";
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/* Nodes use this table to communicate new CDC stream generations to other nodes. */
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static constexpr auto CDC_TOPOLOGY_DESCRIPTION = "cdc_generation_descriptions";
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/* Nodes use this table to communicate new CDC stream generations to other nodes.
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* Resides in system_distributed_everywhere. */
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static constexpr auto CDC_GENERATIONS_V2 = "cdc_generation_descriptions_v2";
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/* This table is used by CDC clients to learn about available CDC streams. */
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static constexpr auto CDC_DESC_V2 = "cdc_streams_descriptions_v2";
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/* Used by CDC clients to learn CDC generation timestamps. */
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static constexpr auto CDC_TIMESTAMPS = "cdc_generation_timestamps";
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/* Previous version of the "cdc_streams_descriptions_v2" table.
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* We use it in the upgrade procedure to ensure that CDC generations appearing
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* in the old table also appear in the new table, if necessary. */
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static constexpr auto CDC_DESC_V1 = "cdc_streams_descriptions";
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/* Information required to modify/query some system_distributed tables, passed from the caller. */
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struct context {
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/* How many different token owners (endpoints) are there in the token ring? */
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size_t num_token_owners;
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};
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private:
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cql3::query_processor& _qp;
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service::migration_manager& _mm;
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service::storage_proxy& _sp;
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bool _started = false;
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bool _forced_cdc_timestamps_schema_sync = false;
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public:
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/* Should writes to the given table always be synchronized by commitlog (flushed to disk)
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* before being acknowledged? */
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static bool is_extra_durable(const sstring& cf_name);
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static std::vector<schema_ptr> all_distributed_tables();
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static std::vector<schema_ptr> all_everywhere_tables();
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system_distributed_keyspace(cql3::query_processor&, service::migration_manager&, service::storage_proxy&);
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future<> start();
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future<> stop();
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bool started() const { return _started; }
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future<std::unordered_map<locator::host_id, sstring>> view_status(sstring ks_name, sstring view_name) const;
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future<> start_view_build(sstring ks_name, sstring view_name) const;
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future<> finish_view_build(sstring ks_name, sstring view_name) const;
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future<> remove_view(sstring ks_name, sstring view_name) const;
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// Precondition: "system_distributed.cdc_generation_descriptions" exists and it was created by Scylla.
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// In practice this means that the table was created by a previous version from which the cluster was upgraded;
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// the precondition says that this function should not be called in clusters that were freshly created in a new version.
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future<> insert_cdc_topology_description(cdc::generation_id_v1, const cdc::topology_description&, context);
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// Precondition: same as above.
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future<std::optional<cdc::topology_description>> read_cdc_topology_description(cdc::generation_id_v1, context);
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future<> insert_cdc_generation(utils::UUID, const cdc::topology_description&, context);
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future<std::optional<cdc::topology_description>> read_cdc_generation(utils::UUID);
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future<> create_cdc_desc(db_clock::time_point, const cdc::topology_description&, context);
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future<bool> cdc_desc_exists(db_clock::time_point, context);
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/* Get all generation timestamps appearing in the "cdc_streams_descriptions" table
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* (the old CDC stream description table). */
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future<std::vector<db_clock::time_point>> get_cdc_desc_v1_timestamps(context);
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future<std::map<db_clock::time_point, cdc::streams_version>> cdc_get_versioned_streams(db_clock::time_point not_older_than, context);
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future<db_clock::time_point> cdc_current_generation_timestamp(context);
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future<qos::service_levels_info> get_service_levels() const;
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future<qos::service_levels_info> get_service_level(sstring service_level_name) const;
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future<> set_service_level(sstring service_level_name, qos::service_level_options slo) const;
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future<> drop_service_level(sstring service_level_name) const;
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};
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}
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