mirror of
https://github.com/scylladb/scylladb.git
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f78b2c5588
Commit 7e3805ed3d removed the load balancing code from cql
server, but it did not remove most of the craft that load balancing
introduced. The most of the complexity (and probably the main reason the
code never worked properly) is around service::client_state class which
is copied before been passed to the request processor (because in the past
the processing could have happened on another shard) and then merged back
into the "master copy" because a request processing may have changed it.
This commit remove all this copying. The client_request is passed as a
reference all the way to the lowest layer that needs it and it copy
construction is removed to make sure nobody copies it by mistake.
tests: dev, default c-s load of 3 node cluster
Message-Id: <20190906083050.GA21796@scylladb.com>
282 lines
14 KiB
C++
282 lines
14 KiB
C++
/*
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* Copyright (C) 2015 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "auth/service.hh"
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#include <seastar/core/reactor.hh>
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#include "service/endpoint_lifecycle_subscriber.hh"
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#include "service/migration_listener.hh"
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#include "service/storage_proxy.hh"
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#include "cql3/query_processor.hh"
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#include "cql3/values.hh"
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#include "auth/authenticator.hh"
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#include <seastar/core/distributed.hh>
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#include "timeout_config.hh"
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#include <seastar/core/semaphore.hh>
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#include <memory>
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#include <boost/intrusive/list.hpp>
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#include <seastar/net/tls.hh>
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#include <seastar/core/metrics_registration.hh>
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#include "utils/fragmented_temporary_buffer.hh"
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#include "service_permit.hh"
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namespace scollectd {
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class registrations;
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}
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class database;
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namespace cql_transport {
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class request_reader;
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class response;
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enum class cql_compression {
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none,
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lz4,
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snappy,
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};
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enum cql_frame_flags {
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compression = 0x01,
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tracing = 0x02,
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warning = 0x08,
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};
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struct [[gnu::packed]] cql_binary_frame_v1 {
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uint8_t version;
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uint8_t flags;
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uint8_t stream;
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uint8_t opcode;
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net::packed<uint32_t> length;
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template <typename Adjuster>
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void adjust_endianness(Adjuster a) {
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return a(length);
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}
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};
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struct [[gnu::packed]] cql_binary_frame_v3 {
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uint8_t version;
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uint8_t flags;
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net::packed<uint16_t> stream;
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uint8_t opcode;
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net::packed<uint32_t> length;
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template <typename Adjuster>
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void adjust_endianness(Adjuster a) {
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return a(stream, length);
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}
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};
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struct cql_query_state {
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service::query_state query_state;
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std::unique_ptr<cql3::query_options> options;
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cql_query_state(service::client_state& client_state, service_permit permit)
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: query_state(client_state, std::move(permit))
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{ }
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};
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struct cql_server_config {
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::timeout_config timeout_config;
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size_t max_request_size;
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std::function<semaphore& ()> get_service_memory_limiter_semaphore;
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bool allow_shard_aware_drivers = true;
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};
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class cql_server {
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private:
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class event_notifier;
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static constexpr cql_protocol_version_type current_version = cql_serialization_format::latest_version;
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std::vector<server_socket> _listeners;
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distributed<service::storage_proxy>& _proxy;
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distributed<cql3::query_processor>& _query_processor;
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cql_server_config _config;
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size_t _max_request_size;
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semaphore& _memory_available;
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seastar::metrics::metric_groups _metrics;
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std::unique_ptr<event_notifier> _notifier;
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private:
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uint64_t _connects = 0;
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uint64_t _connections = 0;
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uint64_t _requests_served = 0;
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uint64_t _requests_serving = 0;
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uint64_t _requests_blocked_memory = 0;
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auth::service& _auth_service;
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const cql3::cql_config& _cql_config;
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public:
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cql_server(distributed<service::storage_proxy>& proxy, distributed<cql3::query_processor>& qp, auth::service&,
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const cql3::cql_config& cql_config, cql_server_config config);
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future<> listen(socket_address addr, std::shared_ptr<seastar::tls::credentials_builder> = {}, bool keepalive = false);
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future<> do_accepts(int which, bool keepalive, socket_address server_addr);
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future<> stop();
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public:
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using response = cql_transport::response;
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private:
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class fmt_visitor;
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friend class connection;
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class connection : public boost::intrusive::list_base_hook<> {
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cql_server& _server;
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socket_address _server_addr;
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connected_socket _fd;
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input_stream<char> _read_buf;
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output_stream<char> _write_buf;
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fragmented_temporary_buffer::reader _buffer_reader;
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seastar::gate _pending_requests_gate;
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future<> _ready_to_respond = make_ready_future<>();
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cql_protocol_version_type _version = 0;
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cql_compression _compression = cql_compression::none;
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cql_serialization_format _cql_serialization_format = cql_serialization_format::latest();
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service::client_state _client_state;
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std::unordered_map<uint16_t, cql_query_state> _query_states;
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unsigned _request_cpu = 0;
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enum class tracing_request_type : uint8_t {
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not_requested,
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no_write_on_close,
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write_on_close
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};
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private:
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using execution_stage_type = inheriting_concrete_execution_stage<
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future<std::unique_ptr<cql_server::response>>,
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cql_server::connection*,
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fragmented_temporary_buffer::istream,
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uint8_t,
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uint16_t,
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service::client_state&,
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tracing_request_type,
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service_permit>;
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static thread_local execution_stage_type _process_request_stage;
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public:
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connection(cql_server& server, socket_address server_addr, connected_socket&& fd, socket_address addr);
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~connection();
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future<> process();
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future<> process_request();
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future<> shutdown();
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private:
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const ::timeout_config& timeout_config() { return _server.timeout_config(); }
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friend class process_request_executor;
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future<std::unique_ptr<cql_server::response>> process_request_one(fragmented_temporary_buffer::istream buf, uint8_t op, uint16_t stream, service::client_state& client_state, tracing_request_type tracing_request, service_permit permit);
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unsigned frame_size() const;
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unsigned pick_request_cpu();
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cql_binary_frame_v3 parse_frame(temporary_buffer<char> buf);
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future<fragmented_temporary_buffer> read_and_decompress_frame(size_t length, uint8_t flags);
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future<std::optional<cql_binary_frame_v3>> read_frame();
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future<std::unique_ptr<cql_server::response>> process_startup(uint16_t stream, request_reader in, service::client_state& client_state);
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future<std::unique_ptr<cql_server::response>> process_auth_response(uint16_t stream, request_reader in, service::client_state& client_state);
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future<std::unique_ptr<cql_server::response>> process_options(uint16_t stream, request_reader in, service::client_state& client_state);
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future<std::unique_ptr<cql_server::response>> process_query(uint16_t stream, request_reader in, service::client_state& client_state, service_permit permit);
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future<std::unique_ptr<cql_server::response>> process_prepare(uint16_t stream, request_reader in, service::client_state& client_state);
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future<std::unique_ptr<cql_server::response>> process_execute(uint16_t stream, request_reader in, service::client_state& client_state, service_permit permit);
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future<std::unique_ptr<cql_server::response>> process_batch(uint16_t stream, request_reader in, service::client_state& client_state, service_permit permit);
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future<std::unique_ptr<cql_server::response>> process_register(uint16_t stream, request_reader in, service::client_state& client_state);
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std::unique_ptr<cql_server::response> make_unavailable_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t required, int32_t alive, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_read_timeout_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t received, int32_t blockfor, bool data_present, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_read_failure_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t received, int32_t numfailures, int32_t blockfor, bool data_present, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_mutation_write_timeout_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t received, int32_t blockfor, db::write_type type, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_mutation_write_failure_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t received, int32_t numfailures, int32_t blockfor, db::write_type type, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_already_exists_error(int16_t stream, exceptions::exception_code err, sstring msg, sstring ks_name, sstring cf_name, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_unprepared_error(int16_t stream, exceptions::exception_code err, sstring msg, bytes id, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_error(int16_t stream, exceptions::exception_code err, sstring msg, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_ready(int16_t stream, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_supported(int16_t stream, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_result(int16_t stream, shared_ptr<cql_transport::messages::result_message> msg, const tracing::trace_state_ptr& tr_state, bool skip_metadata = false);
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std::unique_ptr<cql_server::response> make_topology_change_event(const cql_transport::event::topology_change& event);
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std::unique_ptr<cql_server::response> make_status_change_event(const cql_transport::event::status_change& event);
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std::unique_ptr<cql_server::response> make_schema_change_event(const cql_transport::event::schema_change& event);
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std::unique_ptr<cql_server::response> make_autheticate(int16_t, const sstring&, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_auth_success(int16_t, bytes, const tracing::trace_state_ptr& tr_state);
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std::unique_ptr<cql_server::response> make_auth_challenge(int16_t, bytes, const tracing::trace_state_ptr& tr_state);
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void write_response(foreign_ptr<std::unique_ptr<cql_server::response>>&& response, service_permit permit = empty_service_permit(), cql_compression compression = cql_compression::none);
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void init_cql_serialization_format();
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friend event_notifier;
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};
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friend class type_codec;
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private:
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bool _stopping = false;
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promise<> _all_connections_stopped;
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future<> _stopped = _all_connections_stopped.get_future();
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boost::intrusive::list<connection> _connections_list;
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uint64_t _total_connections = 0;
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uint64_t _current_connections = 0;
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uint64_t _connections_being_accepted = 0;
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private:
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void maybe_idle() {
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if (_stopping && !_connections_being_accepted && !_current_connections) {
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_all_connections_stopped.set_value();
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}
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}
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const ::timeout_config& timeout_config() { return _config.timeout_config; }
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};
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class cql_server::event_notifier : public service::migration_listener,
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public service::endpoint_lifecycle_subscriber
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{
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std::set<cql_server::connection*> _topology_change_listeners;
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std::set<cql_server::connection*> _status_change_listeners;
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std::set<cql_server::connection*> _schema_change_listeners;
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std::unordered_map<gms::inet_address, event::status_change::status_type> _last_status_change;
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public:
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event_notifier();
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~event_notifier();
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void register_event(cql_transport::event::event_type et, cql_server::connection* conn);
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void unregister_connection(cql_server::connection* conn);
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virtual void on_create_keyspace(const sstring& ks_name) override;
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virtual void on_create_column_family(const sstring& ks_name, const sstring& cf_name) override;
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virtual void on_create_user_type(const sstring& ks_name, const sstring& type_name) override;
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virtual void on_create_view(const sstring& ks_name, const sstring& view_name) override;
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virtual void on_create_function(const sstring& ks_name, const sstring& function_name) override;
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virtual void on_create_aggregate(const sstring& ks_name, const sstring& aggregate_name) override;
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virtual void on_update_keyspace(const sstring& ks_name) override;
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virtual void on_update_column_family(const sstring& ks_name, const sstring& cf_name, bool columns_changed) override;
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virtual void on_update_user_type(const sstring& ks_name, const sstring& type_name) override;
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virtual void on_update_view(const sstring& ks_name, const sstring& view_name, bool columns_changed) override;
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virtual void on_update_function(const sstring& ks_name, const sstring& function_name) override;
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virtual void on_update_aggregate(const sstring& ks_name, const sstring& aggregate_name) override;
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virtual void on_drop_keyspace(const sstring& ks_name) override;
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virtual void on_drop_column_family(const sstring& ks_name, const sstring& cf_name) override;
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virtual void on_drop_user_type(const sstring& ks_name, const sstring& type_name) override;
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virtual void on_drop_view(const sstring& ks_name, const sstring& view_name) override;
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virtual void on_drop_function(const sstring& ks_name, const sstring& function_name) override;
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virtual void on_drop_aggregate(const sstring& ks_name, const sstring& aggregate_name) override;
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virtual void on_join_cluster(const gms::inet_address& endpoint) override;
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virtual void on_leave_cluster(const gms::inet_address& endpoint) override;
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virtual void on_up(const gms::inet_address& endpoint) override;
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virtual void on_down(const gms::inet_address& endpoint) override;
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};
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}
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