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afcf17f168c5600a5a4e7ece8126da64370e6021
scylladb/cql3/query_processor.cc
Kamil Braun 30cc07b40d Merge 'Introduce tablets' from Tomasz Grabiec 
This PR introduces an experimental feature called "tablets". Tablets are
a way to distribute data in the cluster, which is an alternative to the
current vnode-based replication. Vnode-based replication strategy tries
to evenly distribute the global token space shared by all tables among
nodes and shards. With tablets, the aim is to start from a different
side. Divide resources of replica-shard into tablets, with a goal of
having a fixed target tablet size, and then assign those tablets to
serve fragments of tables (also called tablets). This will allow us to
balance the load in a more flexible manner, by moving individual tablets
around. Also, unlike with vnode ranges, tablet replicas live on a
particular shard on a given node, which will allow us to bind raft
groups to tablets. Those goals are not yet achieved with this PR, but it
lays the ground for this.

Things achieved in this PR:

  - You can start a cluster and create a keyspace whose tables will use
    tablet-based replication. This is done by setting `initial_tablets`
    option:

    ```
        CREATE KEYSPACE test WITH replication = {'class': 'NetworkTopologyStrategy',
                        'replication_factor': 3,
                        'initial_tablets': 8};
    ```

    All tables created in such a keyspace will be tablet-based.

    Tablet-based replication is a trait, not a separate replication
    strategy. Tablets don't change the spirit of replication strategy, it
    just alters the way in which data ownership is managed. In theory, we
    could use it for other strategies as well like
    EverywhereReplicationStrategy. Currently, only NetworkTopologyStrategy
    is augmented to support tablets.

  - You can create and drop tablet-based tables (no DDL language changes)

  - DML / DQL work with tablet-based tables

    Replicas for tablet-based tables are chosen from tablet metadata
    instead of token metadata

Things which are not yet implemented:

  - handling of views, indexes, CDC created on tablet-based tables
  - sharding is done using the old method, it ignores the shard allocated in tablet metadata
  - node operations (topology changes, repair, rebuild) are not handling tablet-based tables
  - not integrated with compaction groups
  - tablet allocator piggy-backs on tokens to choose replicas.
    Eventually we want to allocate based on current load, not statically

Closes #13387

* github.com:scylladb/scylladb:
  test: topology: Introduce test_tablets.py
  raft: Introduce 'raft_server_force_snapshot' error injection
  locator: network_topology_strategy: Support tablet replication
  service: Introduce tablet_allocator
  locator: Introduce tablet_aware_replication_strategy
  locator: Extract maybe_remove_node_being_replaced()
  dht: token_metadata: Introduce get_my_id()
  migration_manager: Send tablet metadata as part of schema pull
  storage_service: Load tablet metadata when reloading topology state
  storage_service: Load tablet metadata on boot and from group0 changes
  db, migration_manager: Notify about tablet metadata changes via migration_listener::on_update_tablet_metadata()
  migration_notifier: Introduce before_drop_keyspace()
  migration_manager: Make prepare_keyspace_drop_announcement() return a future<>
  test: perf: Introduce perf-tablets
  test: Introduce tablets_test
  test: lib: Do not override table id in create_table()
  utils, tablets: Introduce external_memory_usage()
  db: tablets: Add printers
  db: tablets: Add persistence layer
  dht: Use last_token_of_compaction_group() in split_token_range_msb()
  locator: Introduce tablet_metadata
  dht: Introduce first_token()
  dht: Introduce next_token()
  storage_proxy: Improve trace-level logging
  locator: token_metadata: Fix confusing comment on ring_range()
  dht, storage_proxy: Abstract token space splitting
  Revert "query_ranges_to_vnodes_generator: fix for exclusive boundaries"
  db: Exclude keyspace with per-table replication in get_non_local_strategy_keyspaces_erms()
  db: Introduce get_non_local_vnode_based_strategy_keyspaces()
  service: storage_proxy: Avoid copying keyspace name in write handler
  locator: Introduce per-table replication strategy
  treewide: Use replication_strategy_ptr as a shorter name for abstract_replication_strategy::ptr_type
  locator: Introduce effective_replication_map
  locator: Rename effective_replication_map to vnode_effective_replication_map
  locator: effective_replication_map: Abstract get_pending_endpoints()
  db: Propagate feature_service to abstract_replication_strategy::validate_options()
  db: config: Introduce experimental "TABLETS" feature
  db: Log replication strategy for debugging purposes
  db: Log full exception on error in do_parse_schema_tables()
  db: keyspace: Remove non-const replication strategy getter
  config: Reformat
2023-04-27 09:40:18 +02:00

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/*
* Copyright (C) 2015-present ScyllaDB
*
* Modified by ScyllaDB
*/
/*
* SPDX-License-Identifier: (AGPL-3.0-or-later and Apache-2.0)
*/
#include "cql3/query_processor.hh"
#include <seastar/core/metrics.hh>
#include "lang/wasm_alien_thread_runner.hh"
#include "lang/wasm_instance_cache.hh"
#include "service/storage_proxy.hh"
#include "service/forward_service.hh"
#include "service/raft/raft_group0_client.hh"
#include "cql3/CqlParser.hpp"
#include "cql3/error_collector.hh"
#include "cql3/statements/batch_statement.hh"
#include "cql3/statements/modification_statement.hh"
#include "cql3/util.hh"
#include "cql3/untyped_result_set.hh"
#include "db/config.hh"
#include "data_dictionary/data_dictionary.hh"
#include "utils/hashers.hh"
#include "utils/error_injection.hh"
namespace cql3 {
using namespace statements;
using namespace cql_transport::messages;
logging::logger log("query_processor");
logging::logger prep_cache_log("prepared_statements_cache");
logging::logger authorized_prepared_statements_cache_log("authorized_prepared_statements_cache");
const sstring query_processor::CQL_VERSION = "3.3.1";
const std::chrono::minutes prepared_statements_cache::entry_expiry = std::chrono::minutes(60);
class query_processor::internal_state {
service::query_state _qs;
public:
internal_state() : _qs(service::client_state::for_internal_calls(), empty_service_permit()) {
}
operator service::query_state&() {
return _qs;
}
operator const service::query_state&() const {
return _qs;
}
operator service::client_state&() {
return _qs.get_client_state();
}
operator const service::client_state&() const {
return _qs.get_client_state();
}
};
query_processor::query_processor(service::storage_proxy& proxy, service::forward_service& forwarder, data_dictionary::database db, service::migration_notifier& mn, service::migration_manager& mm, query_processor::memory_config mcfg, cql_config& cql_cfg, utils::loading_cache_config auth_prep_cache_cfg, service::raft_group0_client& group0_client, std::optional<wasm::startup_context> wasm_ctx)
: _migration_subscriber{std::make_unique<migration_subscriber>(this)}
, _proxy(proxy)
, _forwarder(forwarder)
, _db(db)
, _mnotifier(mn)
, _mm(mm)
, _mcfg(mcfg)
, _cql_config(cql_cfg)
, _group0_client(group0_client)
, _internal_state(new internal_state())
, _prepared_cache(prep_cache_log, _mcfg.prepared_statment_cache_size)
, _authorized_prepared_cache(std::move(auth_prep_cache_cfg), authorized_prepared_statements_cache_log)
, _auth_prepared_cache_cfg_cb([this] (uint32_t) { (void) _authorized_prepared_cache_config_action.trigger_later(); })
, _authorized_prepared_cache_config_action([this] { update_authorized_prepared_cache_config(); return make_ready_future<>(); })
, _authorized_prepared_cache_update_interval_in_ms_observer(_db.get_config().permissions_update_interval_in_ms.observe(_auth_prepared_cache_cfg_cb))
, _authorized_prepared_cache_validity_in_ms_observer(_db.get_config().permissions_validity_in_ms.observe(_auth_prepared_cache_cfg_cb))
, _wasm_engine(wasm_ctx ? std::move(wasm_ctx->engine) : nullptr)
, _wasm_instance_cache(wasm_ctx ? std::make_optional<wasm::instance_cache>(wasm_ctx->cache_size, wasm_ctx->instance_size, wasm_ctx->timer_period) : std::nullopt)
, _alien_runner(wasm_ctx ? std::move(wasm_ctx->alien_runner) : nullptr)
{
namespace sm = seastar::metrics;
namespace stm = statements;
using clevel = db::consistency_level;
sm::label cl_label("consistency_level");
sm::label who_label("who"); // Who queried system tables
const auto user_who_label_instance = who_label("user");
const auto internal_who_label_instance = who_label("internal");
sm::label ks_label("ks");
const auto system_ks_label_instance = ks_label("system");
std::vector<sm::metric_definition> qp_group;
qp_group.push_back(sm::make_counter(
"statements_prepared",
_stats.prepare_invocations,
sm::description("Counts the total number of parsed CQL requests.")));
for (auto cl = size_t(clevel::MIN_VALUE); cl <= size_t(clevel::MAX_VALUE); ++cl) {
qp_group.push_back(
sm::make_counter(
"queries",
_stats.queries_by_cl[cl],
sm::description("Counts queries by consistency level."),
{cl_label(clevel(cl))}));
}
_metrics.add_group("query_processor", qp_group);
sm::label cas_label("conditional");
auto cas_label_instance = cas_label("yes");
auto non_cas_label_instance = cas_label("no");
_metrics.add_group(
"cql",
{
sm::make_counter(
"reads",
sm::description("Counts the total number of CQL SELECT requests."),
[this] {
// Reads fall into `cond_selector::NO_CONDITIONS' pigeonhole
return _cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::SELECT)
+ _cql_stats.query_cnt(source_selector::USER, ks_selector::NONSYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::SELECT)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::SELECT)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::NONSYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::SELECT);
}),
sm::make_counter(
"inserts",
sm::description("Counts the total number of CQL INSERT requests with/without conditions."),
{non_cas_label_instance},
[this] {
return _cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::INSERT)
+ _cql_stats.query_cnt(source_selector::USER, ks_selector::NONSYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::INSERT)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::INSERT)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::NONSYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::INSERT);
}),
sm::make_counter(
"inserts",
sm::description("Counts the total number of CQL INSERT requests with/without conditions."),
{cas_label_instance},
[this] {
return _cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::INSERT)
+ _cql_stats.query_cnt(source_selector::USER, ks_selector::NONSYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::INSERT)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::INSERT)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::NONSYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::INSERT);
}),
sm::make_counter(
"updates",
sm::description("Counts the total number of CQL UPDATE requests with/without conditions."),
{non_cas_label_instance},
[this] {
return _cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::UPDATE)
+ _cql_stats.query_cnt(source_selector::USER, ks_selector::NONSYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::UPDATE)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::UPDATE)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::NONSYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::UPDATE);
}),
sm::make_counter(
"updates",
sm::description("Counts the total number of CQL UPDATE requests with/without conditions."),
{cas_label_instance},
[this] {
return _cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::UPDATE)
+ _cql_stats.query_cnt(source_selector::USER, ks_selector::NONSYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::UPDATE)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::UPDATE)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::NONSYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::UPDATE);
}),
sm::make_counter(
"deletes",
sm::description("Counts the total number of CQL DELETE requests with/without conditions."),
{non_cas_label_instance},
[this] {
return _cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::DELETE)
+ _cql_stats.query_cnt(source_selector::USER, ks_selector::NONSYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::DELETE)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::DELETE)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::NONSYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::DELETE);
}),
sm::make_counter(
"deletes",
sm::description("Counts the total number of CQL DELETE requests with/without conditions."),
{cas_label_instance},
[this] {
return _cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::DELETE)
+ _cql_stats.query_cnt(source_selector::USER, ks_selector::NONSYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::DELETE)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::DELETE)
+ _cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::NONSYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::DELETE);
}),
sm::make_counter(
"reads_per_ks",
// Reads fall into `cond_selector::NO_CONDITIONS' pigeonhole
_cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::SELECT),
sm::description("Counts the number of CQL SELECT requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)"),
{user_who_label_instance, system_ks_label_instance}),
sm::make_counter(
"reads_per_ks",
_cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::SELECT),
sm::description("Counts the number of CQL SELECT requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)"),
{internal_who_label_instance, system_ks_label_instance}),
sm::make_counter(
"inserts_per_ks",
_cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::INSERT),
sm::description("Counts the number of CQL INSERT requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)."),
{user_who_label_instance, system_ks_label_instance, non_cas_label_instance}),
sm::make_counter(
"inserts_per_ks",
_cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::INSERT),
sm::description("Counts the number of CQL INSERT requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)."),
{internal_who_label_instance, system_ks_label_instance, non_cas_label_instance}),
sm::make_counter(
"inserts_per_ks",
_cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::INSERT),
sm::description("Counts the number of CQL INSERT requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)."),
{user_who_label_instance, system_ks_label_instance, cas_label_instance}),
sm::make_counter(
"inserts_per_ks",
_cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::INSERT),
sm::description("Counts the number of CQL INSERT requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)."),
{internal_who_label_instance, system_ks_label_instance, cas_label_instance}),
sm::make_counter(
"updates_per_ks",
_cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::UPDATE),
sm::description("Counts the number of CQL UPDATE requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)"),
{user_who_label_instance, system_ks_label_instance, non_cas_label_instance}),
sm::make_counter(
"updates_per_ks",
_cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::UPDATE),
sm::description("Counts the number of CQL UPDATE requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)"),
{internal_who_label_instance, system_ks_label_instance, non_cas_label_instance}),
sm::make_counter(
"updates_per_ks",
_cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::UPDATE),
sm::description("Counts the number of CQL UPDATE requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)"),
{user_who_label_instance, system_ks_label_instance, cas_label_instance}),
sm::make_counter(
"updates_per_ks",
_cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::UPDATE),
sm::description("Counts the number of CQL UPDATE requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)"),
{internal_who_label_instance, system_ks_label_instance, cas_label_instance}),
sm::make_counter(
"deletes_per_ks",
_cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::DELETE),
sm::description("Counts the number of CQL DELETE requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)"),
{user_who_label_instance, system_ks_label_instance, non_cas_label_instance}),
sm::make_counter(
"deletes_per_ks",
_cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::NO_CONDITIONS, stm::statement_type::DELETE),
sm::description("Counts the number of CQL DELETE requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)"),
{internal_who_label_instance, system_ks_label_instance, non_cas_label_instance}),
sm::make_counter(
"deletes_per_ks",
_cql_stats.query_cnt(source_selector::USER, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::DELETE),
sm::description("Counts the number of CQL DELETE requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)"),
{user_who_label_instance, system_ks_label_instance, cas_label_instance}),
sm::make_counter(
"deletes_per_ks",
_cql_stats.query_cnt(source_selector::INTERNAL, ks_selector::SYSTEM, cond_selector::WITH_CONDITIONS, stm::statement_type::DELETE),
sm::description("Counts the number of CQL DELETE requests executed on particular keyspaces. "
"Label `who' indicates where the reqs come from (clients or DB internals)"),
{internal_who_label_instance, system_ks_label_instance, cas_label_instance}),
sm::make_counter(
"batches",
_cql_stats.batches,
sm::description("Counts the total number of CQL BATCH requests without conditions."),
{non_cas_label_instance}),
sm::make_counter(
"batches",
_cql_stats.cas_batches,
sm::description("Counts the total number of CQL BATCH requests with conditions."),
{cas_label_instance}),
sm::make_counter(
"statements_in_batches",
_cql_stats.statements_in_batches,
sm::description("Counts the total number of sub-statements in CQL BATCH requests without conditions."),
{non_cas_label_instance}),
sm::make_counter(
"statements_in_batches",
_cql_stats.statements_in_cas_batches,
sm::description("Counts the total number of sub-statements in CQL BATCH requests with conditions."),
{cas_label_instance}),
sm::make_counter(
"batches_pure_logged",
_cql_stats.batches_pure_logged,
sm::description(
"Counts the total number of LOGGED batches that were executed as LOGGED batches.")),
sm::make_counter(
"batches_pure_unlogged",
_cql_stats.batches_pure_unlogged,
sm::description(
"Counts the total number of UNLOGGED batches that were executed as UNLOGGED "
"batches.")),
sm::make_counter(
"batches_unlogged_from_logged",
_cql_stats.batches_unlogged_from_logged,
sm::description("Counts the total number of LOGGED batches that were executed as UNLOGGED "
"batches.")),
sm::make_counter(
"rows_read",
_cql_stats.rows_read,
sm::description("Counts the total number of rows read during CQL requests.")),
sm::make_counter(
"prepared_cache_evictions",
[] { return prepared_statements_cache::shard_stats().prepared_cache_evictions; },
sm::description("Counts the number of prepared statements cache entries evictions.")),
sm::make_counter(
"unprivileged_entries_evictions_on_size",
[] { return prepared_statements_cache::shard_stats().unprivileged_entries_evictions_on_size; },
sm::description("Counts a number of evictions of prepared statements from the prepared statements cache after they have been used only once. An increasing counter suggests the user may be preparing a different statement for each request instead of reusing the same prepared statement with parameters.")),
sm::make_gauge(
"prepared_cache_size",
[this] { return _prepared_cache.size(); },
sm::description("A number of entries in the prepared statements cache.")),
sm::make_gauge(
"prepared_cache_memory_footprint",
[this] { return _prepared_cache.memory_footprint(); },
sm::description("Size (in bytes) of the prepared statements cache.")),
sm::make_counter(
"secondary_index_creates",
_cql_stats.secondary_index_creates,
sm::description("Counts the total number of CQL CREATE INDEX requests.")),
sm::make_counter(
"secondary_index_drops",
_cql_stats.secondary_index_drops,
sm::description("Counts the total number of CQL DROP INDEX requests.")),
// secondary_index_reads total count is also included in all cql reads
sm::make_counter(
"secondary_index_reads",
_cql_stats.secondary_index_reads,
sm::description("Counts the total number of CQL read requests performed using secondary indexes.")),
// secondary_index_rows_read total count is also included in all cql rows read
sm::make_counter(
"secondary_index_rows_read",
_cql_stats.secondary_index_rows_read,
sm::description("Counts the total number of rows read during CQL requests performed using secondary indexes.")),
// read requests that required ALLOW FILTERING
sm::make_counter(
"filtered_read_requests",
_cql_stats.filtered_reads,
sm::description("Counts the total number of CQL read requests that required ALLOW FILTERING. See filtered_rows_read_total to compare how many rows needed to be filtered.")),
// rows read with filtering enabled (because ALLOW FILTERING was required)
sm::make_counter(
"filtered_rows_read_total",
_cql_stats.filtered_rows_read_total,
sm::description("Counts the total number of rows read during CQL requests that required ALLOW FILTERING. See filtered_rows_matched_total and filtered_rows_dropped_total for information how accurate filtering queries are.")),
// rows read with filtering enabled and accepted by the filter
sm::make_counter(
"filtered_rows_matched_total",
_cql_stats.filtered_rows_matched_total,
sm::description("Counts the number of rows read during CQL requests that required ALLOW FILTERING and accepted by the filter. Number similar to filtered_rows_read_total indicates that filtering is accurate.")),
// rows read with filtering enabled and rejected by the filter
sm::make_counter(
"filtered_rows_dropped_total",
[this]() {return _cql_stats.filtered_rows_read_total - _cql_stats.filtered_rows_matched_total;},
sm::description("Counts the number of rows read during CQL requests that required ALLOW FILTERING and dropped by the filter. Number similar to filtered_rows_read_total indicates that filtering is not accurate and might cause performance degradation.")),
sm::make_counter(
"select_bypass_caches",
_cql_stats.select_bypass_caches,
sm::description("Counts the number of SELECT query executions with BYPASS CACHE option.")),
sm::make_counter(
"select_allow_filtering",
_cql_stats.select_allow_filtering,
sm::description("Counts the number of SELECT query executions with ALLOW FILTERING option.")),
sm::make_counter(
"select_partition_range_scan",
_cql_stats.select_partition_range_scan,
sm::description("Counts the number of SELECT query executions requiring partition range scan.")),
sm::make_counter(
"select_partition_range_scan_no_bypass_cache",
_cql_stats.select_partition_range_scan_no_bypass_cache,
sm::description("Counts the number of SELECT query executions requiring partition range scan without BYPASS CACHE option.")),
sm::make_counter(
"select_parallelized",
_cql_stats.select_parallelized,
sm::description("Counts the number of parallelized aggregation SELECT query executions.")),
sm::make_counter(
"authorized_prepared_statements_cache_evictions",
[] { return authorized_prepared_statements_cache::shard_stats().authorized_prepared_statements_cache_evictions; },
sm::description("Counts the number of authenticated prepared statements cache entries evictions.")),
sm::make_counter(
"authorized_prepared_statements_privileged_entries_evictions_on_size",
[] { return authorized_prepared_statements_cache::shard_stats().authorized_prepared_statements_privileged_entries_evictions_on_size; },
sm::description("Counts a number of evictions of prepared statements from the authorized prepared statements cache after they have been used more than once.")),
sm::make_counter(
"authorized_prepared_statements_unprivileged_entries_evictions_on_size",
[] { return authorized_prepared_statements_cache::shard_stats().authorized_prepared_statements_unprivileged_entries_evictions_on_size; },
sm::description("Counts a number of evictions of prepared statements from the authorized prepared statements cache after they have been used only once. An increasing counter suggests the user may be preparing a different statement for each request instead of reusing the same prepared statement with parameters.")),
sm::make_gauge(
"authorized_prepared_statements_cache_size",
[this] { return _authorized_prepared_cache.size(); },
sm::description("Number of entries in the authenticated prepared statements cache.")),
sm::make_gauge(
"user_prepared_auth_cache_footprint",
[this] { return _authorized_prepared_cache.memory_footprint(); },
sm::description("Size (in bytes) of the authenticated prepared statements cache.")),
sm::make_counter(
"reverse_queries",
_cql_stats.reverse_queries,
sm::description("Counts the number of CQL SELECT requests with reverse ORDER BY order.")),
sm::make_counter(
"unpaged_select_queries",
[this] {
return _cql_stats.unpaged_select_queries(ks_selector::NONSYSTEM)
+ _cql_stats.unpaged_select_queries(ks_selector::SYSTEM);
},
sm::description("Counts the total number of unpaged CQL SELECT requests.")),
sm::make_counter(
"unpaged_select_queries_per_ks",
_cql_stats.unpaged_select_queries(ks_selector::SYSTEM),
sm::description("Counts the number of unpaged CQL SELECT requests against particular keyspaces."),
{system_ks_label_instance})
});
_mnotifier.register_listener(_migration_subscriber.get());
}
query_processor::~query_processor() {
}
future<> query_processor::stop() {
return _mnotifier.unregister_listener(_migration_subscriber.get()).then([this] {
return _authorized_prepared_cache.stop().finally([this] { return _prepared_cache.stop(); });
}).then([this] {
return _wasm_instance_cache ? _wasm_instance_cache->stop() : make_ready_future<>();
});
}
future<::shared_ptr<result_message>>
query_processor::execute_direct_without_checking_exception_message(const sstring_view& query_string, service::query_state& query_state, query_options& options) {
log.trace("execute_direct: \"{}\"", query_string);
tracing::trace(query_state.get_trace_state(), "Parsing a statement");
auto p = get_statement(query_string, query_state.get_client_state());
auto cql_statement = p->statement;
const auto warnings = std::move(p->warnings);
if (cql_statement->get_bound_terms() != options.get_values_count()) {
const auto msg = format("Invalid amount of bind variables: expected {:d} received {:d}",
cql_statement->get_bound_terms(),
options.get_values_count());
throw exceptions::invalid_request_exception(msg);
}
options.prepare(p->bound_names);
warn(unimplemented::cause::METRICS);
#if 0
if (!queryState.getClientState().isInternal)
metrics.regularStatementsExecuted.inc();
#endif
tracing::trace(query_state.get_trace_state(), "Processing a statement");
return cql_statement->check_access(*this, query_state.get_client_state()).then(
[this, cql_statement, &query_state, &options, warnings = std::move(warnings)] () mutable {
return process_authorized_statement(std::move(cql_statement), query_state, options).then(
[warnings = std::move(warnings)] (::shared_ptr<result_message> m) {
for (const auto& w : warnings) {
m->add_warning(w);
}
return make_ready_future<::shared_ptr<result_message>>(m);
});
});
}
future<::shared_ptr<result_message>>
query_processor::execute_prepared_without_checking_exception_message(
statements::prepared_statement::checked_weak_ptr prepared,
cql3::prepared_cache_key_type cache_key,
service::query_state& query_state,
const query_options& options,
bool needs_authorization) {
::shared_ptr<cql_statement> statement = prepared->statement;
future<> fut = make_ready_future<>();
if (needs_authorization) {
fut = statement->check_access(*this, query_state.get_client_state()).then([this, &query_state, prepared = std::move(prepared), cache_key = std::move(cache_key)] () mutable {
return _authorized_prepared_cache.insert(*query_state.get_client_state().user(), std::move(cache_key), std::move(prepared)).handle_exception([] (auto eptr) {
log.error("failed to cache the entry: {}", eptr);
});
});
}
log.trace("execute_prepared: \"{}\"", statement->raw_cql_statement);
return fut.then([this, statement = std::move(statement), &query_state, &options] () mutable {
return process_authorized_statement(std::move(statement), query_state, options);
});
}
future<::shared_ptr<result_message>>
query_processor::process_authorized_statement(const ::shared_ptr<cql_statement> statement, service::query_state& query_state, const query_options& options) {
auto& client_state = query_state.get_client_state();
++_stats.queries_by_cl[size_t(options.get_consistency())];
statement->validate(*this, client_state);
auto fut = statement->execute_without_checking_exception_message(*this, query_state, options);
return fut.then([statement] (auto msg) {
if (msg) {
return make_ready_future<::shared_ptr<result_message>>(std::move(msg));
}
return make_ready_future<::shared_ptr<result_message>>(::make_shared<result_message::void_message>());
});
}
future<::shared_ptr<cql_transport::messages::result_message::prepared>>
query_processor::prepare(sstring query_string, service::query_state& query_state) {
auto& client_state = query_state.get_client_state();
return prepare(std::move(query_string), client_state, client_state.is_thrift());
}
future<::shared_ptr<cql_transport::messages::result_message::prepared>>
query_processor::prepare(sstring query_string, const service::client_state& client_state, bool for_thrift) {
using namespace cql_transport::messages;
if (for_thrift) {
return prepare_one<result_message::prepared::thrift>(
std::move(query_string),
client_state,
compute_thrift_id, prepared_cache_key_type::thrift_id);
} else {
return prepare_one<result_message::prepared::cql>(
std::move(query_string),
client_state,
compute_id,
prepared_cache_key_type::cql_id);
}
}
static std::string hash_target(std::string_view query_string, std::string_view keyspace) {
std::string ret(keyspace);
ret += query_string;
return ret;
}
prepared_cache_key_type query_processor::compute_id(
std::string_view query_string,
std::string_view keyspace) {
return prepared_cache_key_type(md5_hasher::calculate(hash_target(query_string, keyspace)));
}
prepared_cache_key_type query_processor::compute_thrift_id(
const std::string_view& query_string,
const sstring& keyspace) {
uint32_t h = 0;
for (auto&& c : hash_target(query_string, keyspace)) {
h = 31*h + c;
}
return prepared_cache_key_type(static_cast<int32_t>(h));
}
std::unique_ptr<prepared_statement>
query_processor::get_statement(const sstring_view& query, const service::client_state& client_state) {
std::unique_ptr<raw::parsed_statement> statement = parse_statement(query);
// Set keyspace for statement that require login
auto cf_stmt = dynamic_cast<raw::cf_statement*>(statement.get());
if (cf_stmt) {
cf_stmt->prepare_keyspace(client_state);
}
++_stats.prepare_invocations;
auto p = statement->prepare(_db, _cql_stats);
p->statement->raw_cql_statement = sstring(query);
return p;
}
std::unique_ptr<raw::parsed_statement>
query_processor::parse_statement(const sstring_view& query) {
try {
{
const char* error_injection_key = "query_processor-parse_statement-test_failure";
utils::get_local_injector().inject(error_injection_key, [&]() {
if (query.find(error_injection_key) != sstring_view::npos) {
throw std::runtime_error(error_injection_key);
}
});
}
auto statement = util::do_with_parser(query, std::mem_fn(&cql3_parser::CqlParser::query));
if (!statement) {
throw exceptions::syntax_exception("Parsing failed");
}
return statement;
} catch (const exceptions::recognition_exception& e) {
throw exceptions::syntax_exception(format("Invalid or malformed CQL query string: {}", e.what()));
} catch (const exceptions::cassandra_exception& e) {
throw;
} catch (const std::exception& e) {
log.error("The statement: {} could not be parsed: {}", query, e.what());
throw exceptions::syntax_exception(format("Failed parsing statement: [{}] reason: {}", query, e.what()));
}
}
std::vector<std::unique_ptr<raw::parsed_statement>>
query_processor::parse_statements(std::string_view queries) {
try {
auto statements = util::do_with_parser(queries, std::mem_fn(&cql3_parser::CqlParser::queries));
if (statements.empty()) {
throw exceptions::syntax_exception("Parsing failed");
}
return statements;
} catch (const exceptions::recognition_exception& e) {
throw exceptions::syntax_exception(format("Invalid or malformed CQL query string: {}", e.what()));
} catch (const exceptions::cassandra_exception& e) {
throw;
} catch (const std::exception& e) {
log.error("The statements: {} could not be parsed: {}", queries, e.what());
throw exceptions::syntax_exception(format("Failed parsing statements: [{}] reason: {}", queries, e.what()));
}
}
query_options query_processor::make_internal_options(
const statements::prepared_statement::checked_weak_ptr& p,
const std::initializer_list<data_value>& values,
db::consistency_level cl,
int32_t page_size) const {
if (p->bound_names.size() != values.size()) {
throw std::invalid_argument(
format("Invalid number of values. Expecting {:d} but got {:d}", p->bound_names.size(), values.size()));
}
auto ni = p->bound_names.begin();
std::vector<cql3::raw_value> bound_values;
for (auto& v : values) {
auto& n = *ni++;
if (v.type() == bytes_type) {
bound_values.push_back(cql3::raw_value::make_value(value_cast<bytes>(v)));
} else if (v.is_null()) {
bound_values.push_back(cql3::raw_value::make_null());
} else {
bound_values.push_back(cql3::raw_value::make_value(n->type->decompose(v)));
}
}
if (page_size > 0) {
lw_shared_ptr<service::pager::paging_state> paging_state;
db::consistency_level serial_consistency = db::consistency_level::SERIAL;
api::timestamp_type ts = api::missing_timestamp;
return query_options(
cl,
bound_values,
cql3::query_options::specific_options{page_size, std::move(paging_state), serial_consistency, ts});
}
return query_options(cl, bound_values);
}
statements::prepared_statement::checked_weak_ptr query_processor::prepare_internal(const sstring& query_string) {
auto& p = _internal_statements[query_string];
if (p == nullptr) {
auto np = parse_statement(query_string)->prepare(_db, _cql_stats);
np->statement->raw_cql_statement = query_string;
np->statement->validate(*this, *_internal_state);
p = std::move(np); // inserts it into map
}
return p->checked_weak_from_this();
}
struct internal_query_state {
sstring query_string;
std::unique_ptr<query_options> opts;
statements::prepared_statement::checked_weak_ptr p;
bool more_results = true;
};
::shared_ptr<internal_query_state> query_processor::create_paged_state(
const sstring& query_string,
db::consistency_level cl,
const std::initializer_list<data_value>& values,
int32_t page_size) {
auto p = prepare_internal(query_string);
auto opts = make_internal_options(p, values, cl, page_size);
::shared_ptr<internal_query_state> res = ::make_shared<internal_query_state>(
internal_query_state{
query_string,
std::make_unique<cql3::query_options>(std::move(opts)), std::move(p),
true});
return res;
}
bool query_processor::has_more_results(::shared_ptr<cql3::internal_query_state> state) const {
if (state) {
return state->more_results;
}
return false;
}
future<> query_processor::for_each_cql_result(
::shared_ptr<cql3::internal_query_state> state,
noncopyable_function<future<stop_iteration>(const cql3::untyped_result_set::row&)>&& f) {
do {
auto msg = co_await execute_paged_internal(state);
for (auto& row : *msg) {
if ((co_await f(row)) == stop_iteration::yes) {
co_return;
}
}
} while (has_more_results(state));
}
future<::shared_ptr<untyped_result_set>>
query_processor::execute_paged_internal(::shared_ptr<internal_query_state> state) {
return state->p->statement->execute(*this, *_internal_state, *state->opts).then(
[state, this](::shared_ptr<cql_transport::messages::result_message> msg) mutable {
class visitor : public result_message::visitor_base {
::shared_ptr<internal_query_state> _state;
query_processor& _qp;
public:
visitor(::shared_ptr<internal_query_state> state, query_processor& qp) : _state(state), _qp(qp) {
}
virtual ~visitor() = default;
void visit(const result_message::rows& rmrs) override {
auto& rs = rmrs.rs();
if (rs.get_metadata().paging_state()) {
bool done = !rs.get_metadata().flags().contains<cql3::metadata::flag::HAS_MORE_PAGES>();
if (done) {
_state->more_results = false;
} else {
const service::pager::paging_state& st = *rs.get_metadata().paging_state();
lw_shared_ptr<service::pager::paging_state> shrd = make_lw_shared<service::pager::paging_state>(st);
_state->opts = std::make_unique<query_options>(std::move(_state->opts), shrd);
_state->p = _qp.prepare_internal(_state->query_string);
}
} else {
_state->more_results = false;
}
}
};
visitor v(state, *this);
if (msg != nullptr) {
msg->accept(v);
}
return make_ready_future<::shared_ptr<untyped_result_set>>(::make_shared<untyped_result_set>(msg));
});
}
future<::shared_ptr<untyped_result_set>>
query_processor::execute_internal(
const sstring& query_string,
db::consistency_level cl,
const std::initializer_list<data_value>& values,
cache_internal cache) {
return execute_internal(query_string, cl, *_internal_state, values, cache);
}
future<::shared_ptr<untyped_result_set>>
query_processor::execute_internal(
const sstring& query_string,
db::consistency_level cl,
service::query_state& query_state,
const std::initializer_list<data_value>& values,
cache_internal cache) {
if (log.is_enabled(logging::log_level::trace)) {
log.trace("execute_internal: {}\"{}\" ({})", cache ? "(cached) " : "", query_string, fmt::join(values, ", "));
}
if (cache) {
return execute_with_params(prepare_internal(query_string), cl, query_state, values);
} else {
auto p = parse_statement(query_string)->prepare(_db, _cql_stats);
p->statement->raw_cql_statement = query_string;
p->statement->validate(*this, *_internal_state);
auto checked_weak_ptr = p->checked_weak_from_this();
return execute_with_params(std::move(checked_weak_ptr), cl, query_state, values).finally([p = std::move(p)] {});
}
}
future<::shared_ptr<untyped_result_set>>
query_processor::execute_with_params(
statements::prepared_statement::checked_weak_ptr p,
db::consistency_level cl,
service::query_state& query_state,
const std::initializer_list<data_value>& values) {
auto opts = make_internal_options(p, values, cl);
return do_with(std::move(opts), [this, &query_state, p = std::move(p)](auto & opts) {
return p->statement->execute(*this, query_state, opts).then([](auto msg) {
return make_ready_future<::shared_ptr<untyped_result_set>>(::make_shared<untyped_result_set>(msg));
});
});
}
future<::shared_ptr<cql_transport::messages::result_message>>
query_processor::execute_batch_without_checking_exception_message(
::shared_ptr<statements::batch_statement> batch,
service::query_state& query_state,
query_options& options,
std::unordered_map<prepared_cache_key_type, authorized_prepared_statements_cache::value_type> pending_authorization_entries) {
return batch->check_access(*this, query_state.get_client_state()).then([this, &query_state, &options, batch, pending_authorization_entries = std::move(pending_authorization_entries)] () mutable {
return parallel_for_each(pending_authorization_entries, [this, &query_state] (auto& e) {
return _authorized_prepared_cache.insert(*query_state.get_client_state().user(), e.first, std::move(e.second)).handle_exception([] (auto eptr) {
log.error("failed to cache the entry: {}", eptr);
});
}).then([this, &query_state, &options, batch] {
batch->validate();
batch->validate(*this, query_state.get_client_state());
_stats.queries_by_cl[size_t(options.get_consistency())] += batch->get_statements().size();
if (log.is_enabled(logging::log_level::trace)) {
std::ostringstream oss;
for (const auto& s: batch->get_statements()) {
oss << std::endl << s.statement->raw_cql_statement;
}
log.trace("execute_batch({}): {}", batch->get_statements().size(), oss.str());
}
return batch->execute(*this, query_state, options);
});
});
}
query_processor::migration_subscriber::migration_subscriber(query_processor* qp) : _qp{qp} {
}
void query_processor::migration_subscriber::on_create_keyspace(const sstring& ks_name) {
}
void query_processor::migration_subscriber::on_create_column_family(const sstring& ks_name, const sstring& cf_name) {
}
void query_processor::migration_subscriber::on_create_user_type(const sstring& ks_name, const sstring& type_name) {
}
void query_processor::migration_subscriber::on_create_function(const sstring& ks_name, const sstring& function_name) {
log.warn("{} event ignored", __func__);
}
void query_processor::migration_subscriber::on_create_aggregate(const sstring& ks_name, const sstring& aggregate_name) {
log.warn("{} event ignored", __func__);
}
void query_processor::migration_subscriber::on_create_view(const sstring& ks_name, const sstring& view_name) {
}
void query_processor::migration_subscriber::on_update_keyspace(const sstring& ks_name) {
}
void query_processor::migration_subscriber::on_update_column_family(
const sstring& ks_name,
const sstring& cf_name,
bool columns_changed) {
// #1255: Ignoring columns_changed deliberately.
log.info("Column definitions for {}.{} changed, invalidating related prepared statements", ks_name, cf_name);
remove_invalid_prepared_statements(ks_name, cf_name);
}
void query_processor::migration_subscriber::on_update_user_type(const sstring& ks_name, const sstring& type_name) {
}
void query_processor::migration_subscriber::on_update_function(const sstring& ks_name, const sstring& function_name) {
}
void query_processor::migration_subscriber::on_update_aggregate(const sstring& ks_name, const sstring& aggregate_name) {
}
void query_processor::migration_subscriber::on_update_view(
const sstring& ks_name,
const sstring& view_name, bool columns_changed) {
}
void query_processor::migration_subscriber::on_update_tablet_metadata() {
}
void query_processor::migration_subscriber::on_drop_keyspace(const sstring& ks_name) {
remove_invalid_prepared_statements(ks_name, std::nullopt);
}
void query_processor::migration_subscriber::on_drop_column_family(const sstring& ks_name, const sstring& cf_name) {
remove_invalid_prepared_statements(ks_name, cf_name);
}
void query_processor::migration_subscriber::on_drop_user_type(const sstring& ks_name, const sstring& type_name) {
}
void query_processor::migration_subscriber::on_drop_function(const sstring& ks_name, const sstring& function_name) {
log.warn("{} event ignored", __func__);
}
void query_processor::migration_subscriber::on_drop_aggregate(const sstring& ks_name, const sstring& aggregate_name) {
log.warn("{} event ignored", __func__);
}
void query_processor::migration_subscriber::on_drop_view(const sstring& ks_name, const sstring& view_name) {
remove_invalid_prepared_statements(ks_name, view_name);
}
void query_processor::migration_subscriber::remove_invalid_prepared_statements(
sstring ks_name,
std::optional<sstring> cf_name) {
_qp->_prepared_cache.remove_if([&] (::shared_ptr<cql_statement> stmt) {
return this->should_invalidate(ks_name, cf_name, stmt);
});
}
bool query_processor::migration_subscriber::should_invalidate(
sstring ks_name,
std::optional<sstring> cf_name,
::shared_ptr<cql_statement> statement) {
return statement->depends_on(ks_name, cf_name);
}
future<> query_processor::query_internal(
const sstring& query_string,
db::consistency_level cl,
const std::initializer_list<data_value>& values,
int32_t page_size,
noncopyable_function<future<stop_iteration>(const cql3::untyped_result_set_row&)>&& f) {
return for_each_cql_result(create_paged_state(query_string, cl, values, page_size), std::move(f));
}
future<> query_processor::query_internal(
const sstring& query_string,
noncopyable_function<future<stop_iteration>(const cql3::untyped_result_set_row&)>&& f) {
return query_internal(query_string, db::consistency_level::ONE, {}, 1000, std::move(f));
}
shared_ptr<cql_transport::messages::result_message> query_processor::bounce_to_shard(unsigned shard, cql3::computed_function_values cached_fn_calls) {
_proxy.get_stats().replica_cross_shard_ops++;
return ::make_shared<cql_transport::messages::result_message::bounce_to_shard>(shard, std::move(cached_fn_calls));
}
void query_processor::update_authorized_prepared_cache_config() {
utils::loading_cache_config cfg;
cfg.max_size = _mcfg.authorized_prepared_cache_size;
cfg.expiry = std::min(std::chrono::milliseconds(_db.get_config().permissions_validity_in_ms()),
std::chrono::duration_cast<std::chrono::milliseconds>(prepared_statements_cache::entry_expiry));
cfg.refresh = std::chrono::milliseconds(_db.get_config().permissions_update_interval_in_ms());
if (!_authorized_prepared_cache.update_config(std::move(cfg))) {
log.error("Failed to apply authorized prepared statements cache changes. Please read the documentation of these parameters");
}
}
void query_processor::reset_cache() {
_authorized_prepared_cache.reset();
}
}
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