mirror of
https://github.com/codership/wsrep-lib.git
synced 2025-10-18 00:31:19 +03:00
750 lines
22 KiB
C++
750 lines
22 KiB
C++
//
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// Copyright (C) 2018 Codership Oy <info@codership.com>
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//
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#include "wsrep/server_state.hpp"
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#include "wsrep/high_priority_service.hpp"
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#include "wsrep/transaction.hpp"
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#include "wsrep/view.hpp"
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#include "wsrep/logger.hpp"
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#include "wsrep/compiler.hpp"
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#include "wsrep/id.hpp"
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#include <cassert>
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#include <sstream>
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namespace
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{
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std::string cluster_status_string(enum wsrep::server_state::state state)
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{
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switch (state)
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{
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case wsrep::server_state::s_joined:
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case wsrep::server_state::s_synced:
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return "Primary";
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default:
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return "non-Primary";
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}
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}
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std::string cluster_size_string(enum wsrep::server_state::state state,
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const wsrep::view& current_view)
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{
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std::ostringstream oss;
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oss << current_view.members().size();
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return oss.str();
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}
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std::string local_index_string(enum wsrep::server_state::state state,
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const wsrep::view& current_view)
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{
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std::ostringstream oss;
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oss << current_view.own_index();
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return oss.str();
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}
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//
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// This method is used to deal with historical burden of several
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// ways to bootstrap the cluster. Bootstrap happens if
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//
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// * bootstrap option is given
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// * cluster_address is "gcomm://" (Galera provider)
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//
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bool is_bootstrap(const std::string& cluster_address, bool bootstrap)
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{
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return (bootstrap || cluster_address == "gcomm://");
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}
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int apply_write_set(wsrep::server_state& server_state,
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wsrep::high_priority_service& high_priority_service,
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const wsrep::ws_handle& ws_handle,
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const wsrep::ws_meta& ws_meta,
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const wsrep::const_buffer& data)
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{
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int ret(0);
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if (wsrep::starts_transaction(ws_meta.flags()) &&
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wsrep::commits_transaction(ws_meta.flags()))
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{
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if (high_priority_service.start_transaction(ws_handle, ws_meta))
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{
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ret = 1;
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}
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else if (high_priority_service.apply_write_set(data))
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{
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ret = 1;
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}
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else if (high_priority_service.commit())
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{
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ret = 1;
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}
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if (ret)
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{
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high_priority_service.rollback();
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}
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high_priority_service.after_apply();
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}
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else if (wsrep::starts_transaction(ws_meta.flags()))
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{
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assert(server_state.find_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id()) == 0);
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wsrep::high_priority_service* sa(
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server_state.server_service().streaming_applier_service());
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server_state.start_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id(), sa);
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sa->start_transaction(ws_handle, ws_meta);
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{
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wsrep::high_priority_switch sw(high_priority_service, *sa);
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sa->apply_write_set(data);
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sa->after_apply();
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}
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high_priority_service.log_dummy_write_set(ws_handle, ws_meta);
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}
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else if (ws_meta.flags() == 0)
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{
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wsrep::high_priority_service* sa(
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server_state.find_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id()));
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if (sa == 0)
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{
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// It is possible that rapid group membership changes
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// may cause streaming transaction be rolled back before
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// commit fragment comes in. Although this is a valid
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// situation, log a warning if a sac cannot be found as
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// it may be an indication of a bug too.
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assert(0);
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wsrep::log_warning() << "Could not find applier context for "
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<< ws_meta.server_id()
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<< ": " << ws_meta.transaction_id();
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}
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else
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{
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wsrep::high_priority_switch(high_priority_service, *sa);
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ret = sa->apply_write_set(data);
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sa->after_apply();
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}
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high_priority_service.log_dummy_write_set(
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ws_handle, ws_meta);
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}
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else if (wsrep::commits_transaction(ws_meta.flags()))
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{
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if (high_priority_service.is_replaying())
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{
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ret = high_priority_service.apply_write_set(data) ||
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high_priority_service.commit();
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}
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else
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{
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wsrep::high_priority_service* sa(
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server_state.find_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id()));
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if (sa == 0)
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{
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// It is possible that rapid group membership changes
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// may cause streaming transaction be rolled back before
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// commit fragment comes in. Although this is a valid
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// situation, log a warning if a sac cannot be found as
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// it may be an indication of a bug too.
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assert(0);
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wsrep::log_warning()
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<< "Could not find applier context for "
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<< ws_meta.server_id()
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<< ": " << ws_meta.transaction_id();
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}
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else
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{
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wsrep::high_priority_switch(high_priority_service, *sa);
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ret = sa->commit();
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sa->after_apply();
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server_state.stop_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id());
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server_state.server_service().release_high_priority_service(sa);
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}
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}
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}
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else
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{
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// SR fragment applying not implemented yet
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assert(0);
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}
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return ret;
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}
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int apply_toi(wsrep::provider& provider,
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wsrep::high_priority_service& high_priority_service,
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const wsrep::ws_handle& ws_handle,
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const wsrep::ws_meta& ws_meta,
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const wsrep::const_buffer& data)
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{
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if (wsrep::starts_transaction(ws_meta.flags()) &&
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wsrep::commits_transaction(ws_meta.flags()))
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{
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// Regular toi
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provider.commit_order_enter(ws_handle, ws_meta);
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int ret(high_priority_service.apply_toi(data));
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provider.commit_order_leave(ws_handle, ws_meta);
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return ret;
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}
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else if (wsrep::starts_transaction(ws_meta.flags()))
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{
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// NBO begin
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throw wsrep::not_implemented_error();
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}
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else if (wsrep::commits_transaction(ws_meta.flags()))
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{
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// NBO end
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throw wsrep::not_implemented_error();
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}
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else
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{
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assert(0);
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return 0;
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}
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}
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}
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int wsrep::server_state::load_provider(const std::string& provider_spec,
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const std::string& provider_options)
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{
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wsrep::log_info() << "Loading provider "
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<< provider_spec
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<< "initial position: "
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<< initial_position_;
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provider_ = wsrep::provider::make_provider(
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*this, provider_spec, provider_options);
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return (provider_ ? 0 : 1);
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}
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void wsrep::server_state::unload_provider()
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{
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delete provider_;
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provider_ = 0;
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}
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int wsrep::server_state::connect(const std::string& cluster_name,
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const std::string& cluster_address,
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const std::string& state_donor,
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bool bootstrap)
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{
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bootstrap_ = is_bootstrap(cluster_address, bootstrap);
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wsrep::log_info() << "Connecting with bootstrap option: " << bootstrap_;
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return provider().connect(cluster_name, cluster_address, state_donor,
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bootstrap_);
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}
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int wsrep::server_state::disconnect()
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{
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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state(lock, s_disconnecting);
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}
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return provider().disconnect();
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}
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wsrep::server_state::~server_state()
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{
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delete provider_;
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}
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std::vector<wsrep::provider::status_variable>
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wsrep::server_state::status() const
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{
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typedef wsrep::provider::status_variable sv;
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std::vector<sv> ret(provider_->status());
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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ret.push_back(sv("cluster_status", cluster_status_string(state_)));
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ret.push_back(sv("cluster_size",
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cluster_size_string(state_, current_view_)));
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ret.push_back(sv("local_index",
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local_index_string(state_, current_view_)));
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return ret;
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}
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wsrep::seqno wsrep::server_state::pause()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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// Disallow concurrent calls to pause to in order to have non-concurrent
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// access to desynced_on_pause_ which is checked in resume() call.
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while (pause_count_ > 0)
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{
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cond_.wait(lock);
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}
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++pause_count_;
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assert(pause_seqno_.is_undefined());
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if (state_ == s_synced)
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{
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if (desync(lock))
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{
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return wsrep::seqno::undefined();
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}
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desynced_on_pause_ = true;
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}
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lock.unlock();
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pause_seqno_ = provider_->pause();
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lock.lock();
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if (pause_seqno_.is_undefined())
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{
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--pause_count_;
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resync();
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desynced_on_pause_ = false;
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}
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return pause_seqno_;
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}
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void wsrep::server_state::resume()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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assert(pause_seqno_.is_undefined() == false);
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assert(pause_count_ == 1);
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if (desynced_on_pause_)
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{
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resync(lock);
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desynced_on_pause_ = false;
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}
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if (provider_->resume())
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{
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throw wsrep::runtime_error("Failed to resume provider");
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}
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pause_seqno_ = wsrep::seqno::undefined();
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--pause_count_;
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cond_.notify_all();
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}
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std::string wsrep::server_state::prepare_for_sst()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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state(lock, s_joiner);
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return server_service_.sst_request();
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}
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int wsrep::server_state::start_sst(const std::string& sst_request,
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const wsrep::gtid& gtid,
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bool bypass)
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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state(lock, s_donor);
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int ret(0);
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lock.unlock();
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if (server_service_.start_sst(sst_request, gtid, bypass))
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{
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lock.lock();
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wsrep::log_warning() << "SST start failed";
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state(lock, s_synced);
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ret = 1;
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}
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return ret;
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}
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void wsrep::server_state::sst_sent(const wsrep::gtid& gtid, int error)
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{
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wsrep::log_info() << "SST sent: " << gtid << ": " << error;
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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state(lock, s_joined);
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lock.unlock();
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if (provider_->sst_sent(gtid, error))
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{
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server_service_.log_message(wsrep::log::warning,
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"SST sent returned an error");
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}
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}
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void wsrep::server_state::sst_transferred(const wsrep::gtid& gtid)
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{
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wsrep::log_info() << "SST transferred: " << gtid;
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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sst_gtid_ = gtid;
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if (server_service_.sst_before_init())
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{
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state(lock, s_initializing);
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wait_until_state(lock, s_initialized);
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assert(init_initialized_);
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state(lock, s_joined);
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lock.unlock();
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if (provider().sst_received(sst_gtid_, 0))
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{
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throw wsrep::runtime_error("SST received failed");
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}
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}
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else
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{
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state(lock, s_joined);
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}
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}
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void wsrep::server_state::sst_received(const wsrep::gtid& gtid, int error)
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{
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assert(0);
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wsrep::log_info() << "SST received: " << gtid << ": " << error;
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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state(lock, s_joined);
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lock.unlock();
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if (provider_->sst_received(gtid, error))
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{
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throw wsrep::runtime_error("SST received failed");
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}
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}
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void wsrep::server_state::initialized()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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wsrep::log_info() << "Server initialized";
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init_initialized_ = true;
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if (server_service_.sst_before_init())
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{
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state(lock, s_initialized);
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}
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else
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{
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state(lock, s_initializing);
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state(lock, s_initialized);
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}
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}
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void wsrep::server_state::wait_until_state(
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wsrep::unique_lock<wsrep::mutex>& lock,
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enum wsrep::server_state::state state) const
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{
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++state_waiters_[state];
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while (state_ != state)
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{
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cond_.wait(lock);
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}
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--state_waiters_[state];
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cond_.notify_all();
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}
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void wsrep::server_state::last_committed_gtid(const wsrep::gtid& gtid)
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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assert(last_committed_gtid_.is_undefined() ||
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last_committed_gtid_.seqno() + 1 == gtid.seqno());
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last_committed_gtid_ = gtid;
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cond_.notify_all();
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}
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wsrep::gtid wsrep::server_state::last_committed_gtid() const
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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return last_committed_gtid_;
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}
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enum wsrep::provider::status
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wsrep::server_state::wait_for_gtid(const wsrep::gtid& gtid, int timeout)
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const
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{
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return provider_->wait_for_gtid(gtid, timeout);
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}
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std::pair<wsrep::gtid, enum wsrep::provider::status>
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wsrep::server_state::causal_read(int timeout) const
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{
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return provider_->causal_read(timeout);
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}
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void wsrep::server_state::on_connect(const wsrep::gtid& gtid)
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{
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wsrep::log_info() << "Server "
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<< name_
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<< " connected to cluster at position "
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<< gtid;
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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connected_gtid_ = gtid;
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state(lock, s_connected);
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}
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void wsrep::server_state::on_view(const wsrep::view& view)
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{
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wsrep::log_info()
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<< "================================================\nView:\n"
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<< " id: " << view.state_id() << "\n"
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<< " status: " << view.status() << "\n"
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<< " prococol_version: " << view.protocol_version() << "\n"
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<< " own_index: " << view.own_index() << "\n"
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<< " final: " << view.final() << "\n"
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<< " members";
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const std::vector<wsrep::view::member>& members(view.members());
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for (std::vector<wsrep::view::member>::const_iterator i(members.begin());
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i != members.end(); ++i)
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{
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wsrep::log_info() << " id: " << i->id() << " "
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<< "name: " << i->name();
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}
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wsrep::log_info() << "=================================================";
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current_view_ = view;
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if (view.status() == wsrep::view::primary)
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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assert(view.final() == false);
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//
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// Reached primary from connected state. This may mean the following
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//
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// 1) Server was joined to the cluster and got SST transfer
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// 2) Server was partitioned from the cluster and got back
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// 3) A new cluster was bootstrapped from non-prim cluster
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//
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// There is no enough information here what was the cause
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// of the primary component, so we need to walk through
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// all states leading to joined to notify possible state
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// waiters in other threads.
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//
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if (server_service_.sst_before_init())
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{
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if (state_ == s_connected)
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{
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state(lock, s_joiner);
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state(lock, s_initializing);
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}
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}
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else
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{
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if (state_ == s_connected)
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{
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state(lock, s_joiner);
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}
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}
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if (init_initialized_ == false)
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{
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lock.unlock();
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server_service_.debug_sync("on_view_wait_initialized");
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lock.lock();
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wait_until_state(lock, s_initialized);
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}
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assert(init_initialized_);
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if (bootstrap_)
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{
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server_service_.bootstrap();
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bootstrap_ = false;
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}
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if (server_service_.sst_before_init())
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{
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if (state_ == s_initialized)
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{
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state(lock, s_joined);
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if (init_synced_)
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{
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state(lock, s_synced);
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}
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}
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}
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else
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{
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if (state_ == s_joiner)
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{
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state(lock, s_joined);
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if (init_synced_)
|
|
{
|
|
state(lock, s_synced);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (view.status() == wsrep::view::non_primary)
|
|
{
|
|
wsrep::unique_lock<wsrep::mutex> lock(mutex_);
|
|
wsrep::log_info() << "Non-primary view";
|
|
if (view.final())
|
|
{
|
|
state(lock, s_disconnected);
|
|
}
|
|
else if (state_ != s_disconnecting)
|
|
{
|
|
state(lock, s_connected);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
assert(view.final());
|
|
wsrep::unique_lock<wsrep::mutex> lock(mutex_);
|
|
state(lock, s_disconnected);
|
|
}
|
|
server_service_.log_view(view);
|
|
}
|
|
|
|
void wsrep::server_state::on_sync()
|
|
{
|
|
wsrep::log_info() << "Server " << name_ << " synced with group";
|
|
wsrep::unique_lock<wsrep::mutex> lock(mutex_);
|
|
|
|
// Initial sync
|
|
if (server_service_.sst_before_init() && init_synced_ == false)
|
|
{
|
|
switch (state_)
|
|
{
|
|
case s_synced:
|
|
break;
|
|
case s_connected:
|
|
state(lock, s_joiner);
|
|
// fall through
|
|
case s_joiner:
|
|
state(lock, s_initializing);
|
|
break;
|
|
case s_initialized:
|
|
state(lock, s_joined);
|
|
// fall through
|
|
default:
|
|
/* State */
|
|
state(lock, s_synced);
|
|
};
|
|
}
|
|
else
|
|
{
|
|
// Calls to on_sync() in synced state are possible if
|
|
// server desyncs itself from the group. Provider does not
|
|
// inform about this through callbacks.
|
|
if (state_ != s_synced)
|
|
{
|
|
state(lock, s_synced);
|
|
}
|
|
}
|
|
init_synced_ = true;
|
|
}
|
|
|
|
int wsrep::server_state::on_apply(
|
|
wsrep::high_priority_service& high_priority_service,
|
|
const wsrep::ws_handle& ws_handle,
|
|
const wsrep::ws_meta& ws_meta,
|
|
const wsrep::const_buffer& data)
|
|
{
|
|
if (rolls_back_transaction(ws_meta.flags()))
|
|
{
|
|
provider().commit_order_enter(ws_handle, ws_meta);
|
|
// todo: server_service_.log_dummy_write_set();
|
|
provider().commit_order_leave(ws_handle, ws_meta);
|
|
return 0;
|
|
}
|
|
if (is_toi(ws_meta.flags()))
|
|
{
|
|
return apply_toi(provider(), high_priority_service,
|
|
ws_handle, ws_meta, data);
|
|
}
|
|
else if (is_commutative(ws_meta.flags()) || is_native(ws_meta.flags()))
|
|
{
|
|
// Not implemented yet.
|
|
assert(0);
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
return apply_write_set(*this, high_priority_service,
|
|
ws_handle, ws_meta, data);
|
|
}
|
|
}
|
|
|
|
void wsrep::server_state::start_streaming_applier(
|
|
const wsrep::id& server_id,
|
|
const wsrep::transaction_id& transaction_id,
|
|
wsrep::high_priority_service* sa)
|
|
{
|
|
if (streaming_appliers_.insert(
|
|
std::make_pair(std::make_pair(server_id, transaction_id),
|
|
sa)).second == false)
|
|
{
|
|
wsrep::log_error() << "Could not insert streaming applier";
|
|
throw wsrep::fatal_error();
|
|
}
|
|
}
|
|
|
|
void wsrep::server_state::stop_streaming_applier(
|
|
const wsrep::id& server_id,
|
|
const wsrep::transaction_id& transaction_id)
|
|
{
|
|
streaming_appliers_map::iterator i(
|
|
streaming_appliers_.find(std::make_pair(server_id, transaction_id)));
|
|
assert(i != streaming_appliers_.end());
|
|
if (i == streaming_appliers_.end())
|
|
{
|
|
wsrep::log_warning() << "Could not find streaming applier for "
|
|
<< server_id << ":" << transaction_id;
|
|
}
|
|
else
|
|
{
|
|
streaming_appliers_.erase(i);
|
|
}
|
|
}
|
|
|
|
wsrep::high_priority_service* wsrep::server_state::find_streaming_applier(
|
|
const wsrep::id& server_id,
|
|
const wsrep::transaction_id& transaction_id) const
|
|
{
|
|
streaming_appliers_map::const_iterator i(
|
|
streaming_appliers_.find(std::make_pair(server_id, transaction_id)));
|
|
return (i == streaming_appliers_.end() ? 0 : i->second);
|
|
}
|
|
|
|
// Private
|
|
|
|
|
|
int wsrep::server_state::desync(wsrep::unique_lock<wsrep::mutex>& lock)
|
|
{
|
|
assert(lock.owns_lock());
|
|
++desync_count_;
|
|
lock.unlock();
|
|
int ret(provider_->desync());
|
|
lock.lock();
|
|
if (ret)
|
|
{
|
|
--desync_count_;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void wsrep::server_state::resync(wsrep::unique_lock<wsrep::mutex>& lock)
|
|
{
|
|
assert(lock.owns_lock());
|
|
assert(desync_count_ > 0);
|
|
--desync_count_;
|
|
if (provider_->resync())
|
|
{
|
|
throw wsrep::runtime_error("Failed to resync");
|
|
}
|
|
}
|
|
|
|
|
|
void wsrep::server_state::state(
|
|
wsrep::unique_lock<wsrep::mutex>& lock WSREP_UNUSED,
|
|
enum wsrep::server_state::state state)
|
|
{
|
|
assert(lock.owns_lock());
|
|
static const char allowed[n_states_][n_states_] =
|
|
{
|
|
/* dis, ing, ized, cted, jer, jed, dor, sed, ding */
|
|
{ 0, 1, 0, 1, 0, 0, 0, 0, 0}, /* dis */
|
|
{ 1, 0, 1, 0, 0, 0, 0, 0, 0}, /* ing */
|
|
{ 1, 0, 0, 1, 0, 1, 0, 0, 0}, /* ized */
|
|
{ 1, 0, 0, 1, 1, 0, 0, 1, 0}, /* cted */
|
|
{ 1, 1, 0, 0, 0, 1, 0, 0, 0}, /* jer */
|
|
{ 1, 0, 0, 0, 0, 0, 0, 1, 1}, /* jed */
|
|
{ 1, 0, 0, 0, 0, 1, 0, 0, 1}, /* dor */
|
|
{ 1, 0, 0, 1, 0, 1, 1, 0, 1}, /* sed */
|
|
{ 1, 0, 0, 0, 0, 0, 0, 0, 0} /* ding */
|
|
};
|
|
|
|
if (allowed[state_][state])
|
|
{
|
|
wsrep::log_info() << "server " << name_ << " state change: "
|
|
<< to_c_string(state_) << " -> "
|
|
<< to_c_string(state);
|
|
state_hist_.push_back(state_);
|
|
state_ = state;
|
|
cond_.notify_all();
|
|
while (state_waiters_[state_])
|
|
{
|
|
cond_.wait(lock);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
std::ostringstream os;
|
|
os << "server: " << name_ << " unallowed state transition: "
|
|
<< wsrep::to_string(state_) << " -> " << wsrep::to_string(state);
|
|
wsrep::log_error() << os.str() << "\n";
|
|
::abort();
|
|
// throw wsrep::runtime_error(os.str());
|
|
}
|
|
}
|