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5a887362e3
Drop creation of `service_levels` and `cdc_generation_descriptions_v2` table creation code since they are no longer needed. Old clusters will still have it because they were created earlier. Also the series contains a small improvement around group0 creation. No backport needed since this removes functionality. Closes scylladb/scylladb#29482 * github.com:scylladb/scylladb: db/system_distributed_keyspace: remove system_distributed_everywhere since it is unused db/system_distributed_keyspace: drop CDC_TOPOLOGY_DESCRIPTION and CDC_GENERATIONS_V2 db/system_distributed_keyspace: remove unused code db/system_distributed_keyspace: drop old cdc_generation_descriptions_v2 table db/system_distributed_keyspace: drop old service_levels table fix indent after the previous patch group0: call setup_group0 only when needed
95 lines
3.3 KiB
C++
95 lines
3.3 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: LicenseRef-ScyllaDB-Source-Available-1.1
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*/
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#pragma once
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#include "schema/schema_fwd.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 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 VIEW_BUILD_STATUS = "view_build_status";
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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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static std::vector<schema_ptr> all_distributed_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<> 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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// Reads and builds generation map - a map from generation timestamps to vector of all stream ids for that generation.
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// Generations with timestamp >= `not_older_than` are returned, plus the one just before it (the straddling generation).
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// Returns empty map if there are no generations with timestamp >= `not_older_than`.
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// NOTE: there's a sibling `read_cdc_for_tablets_versioned_streams`, that reads the same data for tables backed by tablets. The data returned is the same.
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// NOTE: currently used only by alternator
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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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// Read current generation timestamp for the given table. Throws runtime_error (see `cql3::untyped_result_set::one()`) if table not found.
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// NOTE: there's a sibling `read_cdc_for_tablets_current_generation_timestamp` in `system_keyspace`, that does the same for tables backed up by tablets.
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// NOTE: currently used only by alternator
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future<db_clock::time_point> cdc_current_generation_timestamp(context);
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private:
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future<> create_tables(std::vector<schema_ptr> tables);
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};
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}
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