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scylladb/db/system_keyspace.hh
Marcin Maliszkiewicz cbf47319c1 db: auth: move auth tables to system keyspace 
Separate keyspace which also behaves as system brings
little benefit while creating some compatibility problems
like schema digest mismatch during rollback. So we decided
to move auth tables into system keyspace.

Fixes https://github.com/scylladb/scylladb/issues/18098

Closes scylladb/scylladb#18769

(cherry picked from commit 2ab143fb40)

[avi: adjust test/alternator/suite.yaml to reflect new keyspace]
2024-06-02 21:41:14 +03:00

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/*
* Modified by ScyllaDB
* Copyright (C) 2015-present ScyllaDB
*/
/*
* SPDX-License-Identifier: (AGPL-3.0-or-later and Apache-2.0)
*/
#pragma once
#include <cstdint>
#include <optional>
#include <unordered_map>
#include <utility>
#include <vector>
#include "gms/gossiper.hh"
#include "schema/schema_fwd.hh"
#include "utils/UUID.hh"
#include "query-result-set.hh"
#include "db_clock.hh"
#include "mutation_query.hh"
#include "system_keyspace_view_types.hh"
#include "sstables/sstables_registry.hh"
#include <seastar/core/distributed.hh>
#include "cdc/generation_id.hh"
#include "locator/host_id.hh"
#include "virtual_tables.hh"
#include "types/types.hh"
namespace sstables {
struct entry_descriptor;
class generation_type;
enum class sstable_state;
}
namespace service {
class storage_service;
class raft_group_registry;
struct topology;
struct topology_features;
namespace paxos {
class paxos_state;
class proposal;
} // namespace service::paxos
struct topology_request_state;
class group0_guard;
}
namespace netw {
class messaging_service;
}
namespace cql3 {
class query_processor;
class untyped_result_set;
}
namespace gms {
class inet_address;
class feature;
class feature_service;
}
namespace locator {
class effective_replication_map_factory;
class endpoint_dc_rack;
} // namespace locator
namespace gms {
class gossiper;
}
namespace cdc {
class topology_description;
}
bool is_system_keyspace(std::string_view ks_name);
namespace db {
sstring system_keyspace_name();
class system_keyspace;
namespace schema_tables {
future<column_mapping> get_column_mapping(db::system_keyspace& sys_ks, ::table_id table_id, table_schema_version version);
future<bool> column_mapping_exists(db::system_keyspace& sys_ks, table_id table_id, table_schema_version version);
future<> drop_column_mapping(db::system_keyspace& sys_ks, table_id table_id, table_schema_version version);
}
class config;
struct local_cache;
using system_keyspace_view_name = std::pair<sstring, sstring>;
class system_keyspace_view_build_progress;
struct replay_position;
typedef std::vector<db::replay_position> replay_positions;
struct compaction_history_entry {
utils::UUID id;
sstring ks;
sstring cf;
int64_t compacted_at = 0;
int64_t bytes_in = 0;
int64_t bytes_out = 0;
// Key: number of rows merged
// Value: counter
std::unordered_map<int32_t, int64_t> rows_merged;
};
class system_keyspace : public seastar::peering_sharded_service<system_keyspace>, public seastar::async_sharded_service<system_keyspace> {
cql3::query_processor& _qp;
replica::database& _db;
std::unique_ptr<local_cache> _cache;
virtual_tables_registry _virtual_tables_registry;
bool _peers_table_read_fixup_done = false;
static schema_ptr raft_snapshot_config();
static schema_ptr local();
static schema_ptr peers();
static schema_ptr peer_events();
static schema_ptr range_xfers();
static schema_ptr compactions_in_progress();
static schema_ptr compaction_history();
static schema_ptr sstable_activity();
static schema_ptr large_partitions();
static schema_ptr large_rows();
static schema_ptr large_cells();
static schema_ptr scylla_local();
future<> force_blocking_flush(sstring cfname);
// This function is called when the system.peers table is read,
// and it fixes some types of inconsistencies that can occur
// due to node crashes:
// * missing host_id. This is possible in the old versions of the code. Such records
// are removed and the warning is written to the log.
// * duplicate IPs for a given host_id. This is possible when some node changes its IP
// and this node crashes after adding a new IP but before removing the old one. The
// record with older timestamp is removed, the warning is written to the log.
future<> peers_table_read_fixup();
public:
static schema_ptr size_estimates();
public:
static constexpr auto NAME = "system";
static constexpr auto HINTS = "hints";
static constexpr auto BATCHLOG = "batchlog";
static constexpr auto PAXOS = "paxos";
static constexpr auto BUILT_INDEXES = "IndexInfo";
static constexpr auto LOCAL = "local";
static constexpr auto TRUNCATED = "truncated";
static constexpr auto COMMITLOG_CLEANUPS = "commitlog_cleanups";
static constexpr auto PEERS = "peers";
static constexpr auto PEER_EVENTS = "peer_events";
static constexpr auto RANGE_XFERS = "range_xfers";
static constexpr auto COMPACTIONS_IN_PROGRESS = "compactions_in_progress";
static constexpr auto COMPACTION_HISTORY = "compaction_history";
static constexpr auto SSTABLE_ACTIVITY = "sstable_activity";
static constexpr auto SIZE_ESTIMATES = "size_estimates";
static constexpr auto LARGE_PARTITIONS = "large_partitions";
static constexpr auto LARGE_ROWS = "large_rows";
static constexpr auto LARGE_CELLS = "large_cells";
static constexpr auto SCYLLA_LOCAL = "scylla_local";
static constexpr auto RAFT = "raft";
static constexpr auto RAFT_SNAPSHOTS = "raft_snapshots";
static constexpr auto RAFT_SNAPSHOT_CONFIG = "raft_snapshot_config";
static constexpr auto REPAIR_HISTORY = "repair_history";
static constexpr auto GROUP0_HISTORY = "group0_history";
static constexpr auto DISCOVERY = "discovery";
static constexpr auto BROADCAST_KV_STORE = "broadcast_kv_store";
static constexpr auto TOPOLOGY = "topology";
static constexpr auto TOPOLOGY_REQUESTS = "topology_requests";
static constexpr auto SSTABLES_REGISTRY = "sstables";
static constexpr auto CDC_GENERATIONS_V3 = "cdc_generations_v3";
static constexpr auto TABLETS = "tablets";
static constexpr auto SERVICE_LEVELS_V2 = "service_levels_v2";
// auth
static constexpr auto ROLES = "roles";
static constexpr auto ROLE_MEMBERS = "role_members";
static constexpr auto ROLE_ATTRIBUTES = "role_attributes";
static constexpr auto ROLE_PERMISSIONS = "role_permissions";
struct v3 {
static constexpr auto BATCHES = "batches";
static constexpr auto PAXOS = "paxos";
static constexpr auto BUILT_INDEXES = "IndexInfo";
static constexpr auto LOCAL = "local";
static constexpr auto PEERS = "peers";
static constexpr auto PEER_EVENTS = "peer_events";
static constexpr auto RANGE_XFERS = "range_xfers";
static constexpr auto COMPACTION_HISTORY = "compaction_history";
static constexpr auto SSTABLE_ACTIVITY = "sstable_activity";
static constexpr auto SIZE_ESTIMATES = "size_estimates";
static constexpr auto AVAILABLE_RANGES = "available_ranges";
static constexpr auto VIEWS_BUILDS_IN_PROGRESS = "views_builds_in_progress";
static constexpr auto BUILT_VIEWS = "built_views";
static constexpr auto SCYLLA_VIEWS_BUILDS_IN_PROGRESS = "scylla_views_builds_in_progress";
static constexpr auto CDC_LOCAL = "cdc_local";
static schema_ptr batches();
static schema_ptr built_indexes();
static schema_ptr local();
static schema_ptr truncated();
static schema_ptr commitlog_cleanups();
static schema_ptr peers();
static schema_ptr peer_events();
static schema_ptr range_xfers();
static schema_ptr compaction_history();
static schema_ptr sstable_activity();
static schema_ptr size_estimates();
static schema_ptr large_partitions();
static schema_ptr scylla_local();
static schema_ptr available_ranges();
static schema_ptr views_builds_in_progress();
static schema_ptr built_views();
static schema_ptr scylla_views_builds_in_progress();
static schema_ptr cdc_local();
};
struct legacy {
static constexpr auto HINTS = "hints";
static constexpr auto BATCHLOG = "batchlog";
static constexpr auto KEYSPACES = "schema_keyspaces";
static constexpr auto COLUMNFAMILIES = "schema_columnfamilies";
static constexpr auto COLUMNS = "schema_columns";
static constexpr auto TRIGGERS = "schema_triggers";
static constexpr auto USERTYPES = "schema_usertypes";
static constexpr auto FUNCTIONS = "schema_functions";
static constexpr auto AGGREGATES = "schema_aggregates";
static schema_ptr keyspaces();
static schema_ptr column_families();
static schema_ptr columns();
static schema_ptr triggers();
static schema_ptr usertypes();
static schema_ptr functions();
static schema_ptr aggregates();
static schema_ptr hints();
static schema_ptr batchlog();
};
// Partition estimates for a given range of tokens.
struct range_estimates {
schema_ptr schema;
bytes range_start_token;
bytes range_end_token;
int64_t partitions_count;
int64_t mean_partition_size;
};
using view_name = system_keyspace_view_name;
using view_build_progress = system_keyspace_view_build_progress;
static schema_ptr hints();
static schema_ptr batchlog();
static schema_ptr paxos();
static schema_ptr built_indexes(); // TODO (from Cassandra): make private
static schema_ptr raft();
static schema_ptr raft_snapshots();
static schema_ptr repair_history();
static schema_ptr group0_history();
static schema_ptr discovery();
static schema_ptr broadcast_kv_store();
static schema_ptr topology();
static schema_ptr topology_requests();
static schema_ptr sstables_registry();
static schema_ptr cdc_generations_v3();
static schema_ptr tablets();
static schema_ptr service_levels_v2();
// auth
static schema_ptr roles();
static schema_ptr role_members();
static schema_ptr role_attributes();
static schema_ptr role_permissions();
static table_schema_version generate_schema_version(table_id table_id, uint16_t offset = 0);
future<> build_bootstrap_info();
future<std::unordered_map<table_id, db_clock::time_point>> load_truncation_times();
future<> update_schema_version(table_schema_version version);
/*
* Save tokens used by this node in the LOCAL table.
*/
future<> update_tokens(const std::unordered_set<dht::token>& tokens);
future<std::unordered_map<gms::inet_address, gms::inet_address>> get_preferred_ips();
public:
struct peer_info {
std::optional<sstring> data_center;
std::optional<net::inet_address> preferred_ip;
std::optional<sstring> rack;
std::optional<sstring> release_version;
std::optional<net::inet_address> rpc_address;
std::optional<utils::UUID> schema_version;
std::optional<std::unordered_set<dht::token>> tokens;
std::optional<sstring> supported_features;
};
future<> update_peer_info(gms::inet_address ep, locator::host_id hid, const peer_info& info);
future<> remove_endpoint(gms::inet_address ep);
// Saves the key-value pair into system.scylla_local table.
// Pass visible_before_cl_replay = true iff the data should be available before
// schema commitlog replay. We do table.flush in this case, so it's rather slow and heavyweight.
future<> set_scylla_local_param(const sstring& key, const sstring& value, bool visible_before_cl_replay);
future<std::optional<sstring>> get_scylla_local_param(const sstring& key);
// Saves the key-value pair into system.scylla_local table.
// Pass visible_before_cl_replay = true iff the data should be available before
// schema commitlog replay. We do table.flush in this case, so it's rather slow and heavyweight.
template <typename T>
future<> set_scylla_local_param_as(const sstring& key, const T& value, bool visible_before_cl_replay);
template <typename T>
future<std::optional<T>> get_scylla_local_param_as(const sstring& key);
static std::vector<schema_ptr> auth_tables();
static std::vector<schema_ptr> all_tables(const db::config& cfg);
future<> make(
locator::effective_replication_map_factory&,
replica::database&);
void mark_writable();
/// overloads
future<foreign_ptr<lw_shared_ptr<reconcilable_result>>>
static query_mutations(distributed<replica::database>& db,
schema_ptr schema);
future<foreign_ptr<lw_shared_ptr<reconcilable_result>>>
static query_mutations(distributed<replica::database>& db,
const sstring& ks_name,
const sstring& cf_name);
future<foreign_ptr<lw_shared_ptr<reconcilable_result>>>
static query_mutations(distributed<replica::database>& db,
const sstring& ks_name,
const sstring& cf_name,
const dht::partition_range& partition_range,
query::clustering_range row_ranges = query::clustering_range::make_open_ended_both_sides());
// Returns all data from given system table.
// Intended to be used by code which is not performance critical.
static future<lw_shared_ptr<query::result_set>> query(distributed<replica::database>& db,
const sstring& ks_name,
const sstring& cf_name);
// Returns a slice of given system table.
// Intended to be used by code which is not performance critical.
static future<lw_shared_ptr<query::result_set>> query(
distributed<replica::database>& db,
const sstring& ks_name,
const sstring& cf_name,
const dht::decorated_key& key,
query::clustering_range row_ranges = query::clustering_range::make_open_ended_both_sides());
/**
* Return a map of nodes and their loaded_endpoint_state
*/
future<std::unordered_map<locator::host_id, gms::loaded_endpoint_state>> load_endpoint_state();
enum class bootstrap_state {
NEEDS_BOOTSTRAP,
COMPLETED,
IN_PROGRESS,
DECOMMISSIONED
};
future<> update_compaction_history(utils::UUID uuid, sstring ksname, sstring cfname, int64_t compacted_at, int64_t bytes_in, int64_t bytes_out,
std::unordered_map<int32_t, int64_t> rows_merged);
using compaction_history_consumer = noncopyable_function<future<>(const compaction_history_entry&)>;
future<> get_compaction_history(compaction_history_consumer f);
struct repair_history_entry {
tasks::task_id id;
table_id table_uuid;
db_clock::time_point ts;
sstring ks;
sstring cf;
int64_t range_start;
int64_t range_end;
};
future<> update_repair_history(repair_history_entry);
using repair_history_consumer = noncopyable_function<future<>(const repair_history_entry&)>;
future<> get_repair_history(table_id, repair_history_consumer f);
future<> save_truncation_record(const replica::column_family&, db_clock::time_point truncated_at, db::replay_position);
future<replay_positions> get_truncated_positions(table_id);
future<> drop_truncation_rp_records();
// Converts a `dht::token_range` object to the left-open integer range (x,y] form.
//
// Note: perhaps this should be extracted to `dht/`, or somewhere.
static std::pair<int64_t, int64_t> canonical_token_range(dht::token_range tr);
// When a commitlog replay happens after a successful cleanup operation,
// we have to filter out the mutations affected by the cleanup,
// to avoid data resurrection.
//
// For this purpose, records of cleanup operations (the affected token ranges
// and commitlog ranges) are kept in a system table.
//
// The below functions manipulate these records.
// Saves a record of a token range affected by cleanup.
// After reboot, tokens from this range will be replayed only if they are on replay positions
// strictly greater than the given one.
future<> save_commitlog_cleanup_record(table_id, dht::token_range, db::replay_position);
struct commitlog_cleanup_map_hash {
size_t operator()(const std::pair<table_id, int32_t>& p) const;
};
// For a given token, this map returns the maximum replay position affected by cleanups.
// A mutation in commitlog should only be replayed if it lies on a replay position
// greater than that maximum for its token.
struct commitlog_cleanup_local_map {
// pimpl to avoid transitive #include of boost/icl.
class impl;
std::unique_ptr<impl> _pimpl;
~commitlog_cleanup_local_map();
commitlog_cleanup_local_map();
std::optional<db::replay_position> get(int64_t token) const;
};
using commitlog_cleanup_map = std::unordered_map<
std::pair<table_id, int32_t>,
commitlog_cleanup_local_map,
commitlog_cleanup_map_hash
>;
future<commitlog_cleanup_map> get_commitlog_cleanup_records();
// Drops all cleanup records which apply to positions older than the given one.
// Used to drop records which only apply to segments which have already been deleted.
future<> drop_old_commitlog_cleanup_records(replay_position);
// Cleans all records. Used after a successful replay, since the records only
// apply to the commitlog of the last boot cycle, and can be wrong in this cycle.
future<> drop_all_commitlog_cleanup_records();
/**
* Return a map of stored tokens to IP addresses
*
*/
future<std::unordered_map<gms::inet_address, std::unordered_set<dht::token>>> load_tokens();
/**
* Return a map of store host_ids to IP addresses
*
*/
future<std::unordered_map<gms::inet_address, locator::host_id>> load_host_ids();
future<std::vector<gms::inet_address>> load_peers();
/*
* Read this node's tokens stored in the LOCAL table.
* Used to initialize a restarting node.
*/
future<std::unordered_set<dht::token>> get_saved_tokens();
/*
* Gets this node's non-empty set of tokens.
* TODO: maybe get this data from token_metadata instance?
*/
future<std::unordered_set<dht::token>> get_local_tokens();
future<std::unordered_map<gms::inet_address, sstring>> load_peer_features();
future<std::set<sstring>> load_local_enabled_features();
// This function stores the features in the system.scylla_local table.
// We pass visible_before_cl_replay=true iff the features should be available before
// schema commitlog replay. We do table.flush in this case, so it's rather slow and heavyweight.
// Features over RAFT are migrated to system.topology table, but
// we still call this function in that case with visible_before_cl_replay=false
// for backward compatibility, since some client applications
// may depend on it.
future<> save_local_enabled_features(std::set<sstring> features, bool visible_before_cl_replay);
future<int> increment_and_get_generation();
bool bootstrap_needed() const;
bool bootstrap_complete() const;
bool bootstrap_in_progress() const;
bootstrap_state get_bootstrap_state() const;
bool was_decommissioned() const;
future<> set_bootstrap_state(bootstrap_state state);
struct local_info {
locator::host_id host_id;
sstring cluster_name;
gms::inet_address listen_address;
};
future<local_info> load_local_info();
future<> save_local_info(local_info, locator::endpoint_dc_rack, gms::inet_address broadcast_address, gms::inet_address broadcast_rpc_address);
public:
static api::timestamp_type schema_creation_timestamp();
/**
* Builds a mutation for SIZE_ESTIMATES_CF containing the specified estimates.
*/
static mutation make_size_estimates_mutation(const sstring& ks, std::vector<range_estimates> estimates);
future<> register_view_for_building(sstring ks_name, sstring view_name, const dht::token& token);
future<> update_view_build_progress(sstring ks_name, sstring view_name, const dht::token& token);
future<> remove_view_build_progress(sstring ks_name, sstring view_name);
future<> remove_view_build_progress_across_all_shards(sstring ks_name, sstring view_name);
future<> mark_view_as_built(sstring ks_name, sstring view_name);
future<> remove_built_view(sstring ks_name, sstring view_name);
future<std::vector<view_name>> load_built_views();
future<std::vector<view_build_progress>> load_view_build_progress();
// Paxos related functions
future<service::paxos::paxos_state> load_paxos_state(partition_key_view key, schema_ptr s, gc_clock::time_point now,
db::timeout_clock::time_point timeout);
future<> save_paxos_promise(const schema& s, const partition_key& key, const utils::UUID& ballot, db::timeout_clock::time_point timeout);
future<> save_paxos_proposal(const schema& s, const service::paxos::proposal& proposal, db::timeout_clock::time_point timeout);
future<> save_paxos_decision(const schema& s, const service::paxos::proposal& decision, db::timeout_clock::time_point timeout);
future<> delete_paxos_decision(const schema& s, const partition_key& key, const utils::UUID& ballot, db::timeout_clock::time_point timeout);
// CDC related functions
/*
* Save the CDC generation ID announced by this node in persistent storage.
*/
future<> update_cdc_generation_id(cdc::generation_id);
/*
* Read the CDC generation ID announced by this node from persistent storage.
* Used to initialize a restarting node.
*/
future<std::optional<cdc::generation_id>> get_cdc_generation_id();
future<bool> cdc_is_rewritten();
future<> cdc_set_rewritten(std::optional<cdc::generation_id_v1>);
// Load Raft Group 0 id from scylla.local
future<utils::UUID> get_raft_group0_id();
// Persist Raft Group 0 id. Should be a TIMEUUID.
future<> set_raft_group0_id(utils::UUID id);
// Save advertised gossip feature set to system.local
future<> save_local_supported_features(const std::set<std::string_view>& feats);
// Get the last (the greatest in timeuuid order) state ID in the group 0 history table.
// Assumes that the history table exists, i.e. Raft experimental feature is enabled.
future<utils::UUID> get_last_group0_state_id();
// Checks whether the group 0 history table contains the given state ID.
// Assumes that the history table exists, i.e. Raft experimental feature is enabled.
future<bool> group0_history_contains(utils::UUID state_id);
// force_load_hosts is a set of hosts which must be loaded even if they are in the left state.
future<service::topology> load_topology_state(const std::unordered_set<locator::host_id>& force_load_hosts);
future<std::optional<service::topology_features>> load_topology_features_state();
// Read CDC generation data with the given UUID as key.
// Precondition: the data is known to be present in the table (because it was committed earlier through group 0).
future<cdc::topology_description> read_cdc_generation(utils::UUID id);
// Read CDC generation data with the given UUID as key.
// Unlike `read_cdc_generation`, does not require the data to be present.
// This method is meant to be used after switching back to legacy mode due to raft recovery,
// as the node will need to fetch definition of a CDC generation that was
// previously created in raft topology mode.
future<std::optional<cdc::topology_description>> read_cdc_generation_opt(utils::UUID id);
// The mutation appends the given state ID to the group 0 history table, with the given description if non-empty.
//
// If `gc_older_than` is provided, the mutation will also contain a tombstone that clears all entries whose
// timestamps (contained in the state IDs) are older than `timestamp(state_id) - gc_older_than`.
// The duration must be non-negative and smaller than `timestamp(state_id)`.
//
// The mutation's timestamp is extracted from the state ID.
static mutation make_group0_history_state_id_mutation(
utils::UUID state_id, std::optional<gc_clock::duration> gc_older_than, std::string_view description);
// Obtain the contents of the group 0 history table in mutation form.
// Assumes that the history table exists, i.e. Raft feature is enabled.
static future<mutation> get_group0_history(distributed<replica::database>&);
// If the `group0_schema_version` key in `system.scylla_local` is present (either live or tombstone),
// returns the corresponding mutation. Otherwise returns nullopt.
future<std::optional<mutation>> get_group0_schema_version();
enum class auth_version_t: int64_t {
v1 = 1,
v2 = 2,
};
// If the `auth_version` key in `system.scylla_local` is present (either live or tombstone),
// returns the corresponding mutation. Otherwise returns nullopt.
future<std::optional<mutation>> get_auth_version_mutation();
future<mutation> make_auth_version_mutation(api::timestamp_type ts, auth_version_t version);
future<auth_version_t> get_auth_version();
future<> sstables_registry_create_entry(sstring location, sstring status, sstables::sstable_state state, sstables::entry_descriptor desc);
future<> sstables_registry_update_entry_status(sstring location, sstables::generation_type gen, sstring status);
future<> sstables_registry_update_entry_state(sstring location, sstables::generation_type gen, sstables::sstable_state state);
future<> sstables_registry_delete_entry(sstring location, sstables::generation_type gen);
using sstable_registry_entry_consumer = sstables::sstables_registry::entry_consumer;
future<> sstables_registry_list(sstring location, sstable_registry_entry_consumer consumer);
future<std::optional<sstring>> load_group0_upgrade_state();
future<> save_group0_upgrade_state(sstring);
future<bool> get_must_synchronize_topology();
future<> set_must_synchronize_topology(bool);
future<service::topology_request_state> get_topology_request_state(utils::UUID id);
public:
future<std::optional<int8_t>> get_service_levels_version();
future<mutation> make_service_levels_version_mutation(int8_t version, const service::group0_guard& guard);
future<std::optional<mutation>> get_service_levels_version_mutation();
private:
static std::optional<service::topology_features> decode_topology_features_state(::shared_ptr<cql3::untyped_result_set> rs);
public:
system_keyspace(cql3::query_processor& qp, replica::database& db) noexcept;
~system_keyspace();
future<> shutdown();
virtual_tables_registry& get_virtual_tables_registry() { return _virtual_tables_registry; }
private:
future<::shared_ptr<cql3::untyped_result_set>> execute_cql(const sstring& query_string, const data_value_list& values);
template <typename... Args>
future<::shared_ptr<cql3::untyped_result_set>> execute_cql_with_timeout(sstring req, db::timeout_clock::time_point timeout, Args&&... args);
public:
template <typename... Args>
future<::shared_ptr<cql3::untyped_result_set>> execute_cql(sstring req, Args&&... args) {
return execute_cql(req, { data_value(std::forward<Args>(args))... });
}
friend future<column_mapping> db::schema_tables::get_column_mapping(db::system_keyspace& sys_ks, ::table_id table_id, table_schema_version version);
friend future<bool> db::schema_tables::column_mapping_exists(db::system_keyspace& sys_ks, table_id table_id, table_schema_version version);
friend future<> db::schema_tables::drop_column_mapping(db::system_keyspace& sys_ks, table_id table_id, table_schema_version version);
const replica::database& local_db() const noexcept {
return _db;
}
cql3::query_processor& query_processor() const noexcept {
return _qp;
}
}; // class system_keyspace
} // namespace db
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