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https://github.com/codership/wsrep-lib.git
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3a1b194741
Certification keys are needed for NBO end to resolve dependencies for the write sets which follow NBO end. Without keys the following write sets do not detect dependency to NBO event and may start applying too early.
801 lines
25 KiB
C++
801 lines
25 KiB
C++
/*
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* Copyright (C) 2018-2019 Codership Oy <info@codership.com>
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*
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* This file is part of wsrep-lib.
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*
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* Wsrep-lib is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* Wsrep-lib 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 wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "wsrep/client_state.hpp"
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#include "wsrep/compiler.hpp"
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#include "wsrep/logger.hpp"
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#include <unistd.h> // usleep()
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#include <sstream>
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#include <iostream>
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wsrep::provider& wsrep::client_state::provider() const
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{
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return server_state_.provider();
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}
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void wsrep::client_state::open(wsrep::client_id id)
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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assert(state_ == s_none);
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debug_log_state("open: enter");
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owning_thread_id_ = wsrep::this_thread::get_id();
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rollbacker_active_ = false;
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sync_wait_gtid_ = wsrep::gtid::undefined();
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last_written_gtid_ = wsrep::gtid::undefined();
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state(lock, s_idle);
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id_ = id;
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debug_log_state("open: leave");
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}
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void wsrep::client_state::close()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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debug_log_state("close: enter");
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state(lock, s_quitting);
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lock.unlock();
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if (transaction_.active())
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{
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client_service_.bf_rollback();
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transaction_.after_statement();
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}
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if (mode_ == m_local)
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{
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disable_streaming();
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}
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debug_log_state("close: leave");
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}
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void wsrep::client_state::cleanup()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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debug_log_state("cleanup: enter");
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state(lock, s_none);
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debug_log_state("cleanup: leave");
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}
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void wsrep::client_state::override_error(enum wsrep::client_error error,
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enum wsrep::provider::status status)
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{
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assert(wsrep::this_thread::get_id() == owning_thread_id_);
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// Error state should not be cleared with success code without
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// explicit reset_error() call.
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assert(current_error_ == wsrep::e_success ||
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error != wsrep::e_success);
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current_error_ = error;
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current_error_status_ = status;
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}
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int wsrep::client_state::before_command()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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debug_log_state("before_command: enter");
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// If the state is s_exec, the processing thread has already grabbed
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// control with wait_rollback_complete_and_acquire_ownership()
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if (state_ != s_exec)
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{
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assert(state_ == s_idle);
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do_wait_rollback_complete_and_acquire_ownership(lock);
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assert(state_ == s_exec);
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}
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else
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{
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// This thread must have acquired control by other means,
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// for example via wait_rollback_complete_and_acquire_ownership().
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assert(wsrep::this_thread::get_id() == owning_thread_id_);
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}
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// If the transaction is active, it must be either executing,
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// aborted as rolled back by rollbacker, or must_abort if the
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// client thread gained control via
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// wait_rollback_complete_and_acquire_ownership()
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// just before BF abort happened.
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assert(transaction_.active() == false ||
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(transaction_.state() == wsrep::transaction::s_executing ||
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transaction_.state() == wsrep::transaction::s_prepared ||
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transaction_.state() == wsrep::transaction::s_aborted ||
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transaction_.state() == wsrep::transaction::s_must_abort));
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if (transaction_.active())
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{
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if (transaction_.state() == wsrep::transaction::s_must_abort)
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{
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assert(server_state_.rollback_mode() ==
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wsrep::server_state::rm_async);
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override_error(wsrep::e_deadlock_error);
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lock.unlock();
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client_service_.bf_rollback();
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(void)transaction_.after_statement();
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lock.lock();
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assert(transaction_.state() ==
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wsrep::transaction::s_aborted);
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assert(transaction_.active() == false);
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assert(current_error() != wsrep::e_success);
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debug_log_state("before_command: error");
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return 1;
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}
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else if (transaction_.state() == wsrep::transaction::s_aborted)
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{
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// Transaction was rolled back either just before sending result
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// to the client, or after client_state become idle.
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// Clean up the transaction and return error.
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override_error(wsrep::e_deadlock_error);
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lock.unlock();
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(void)transaction_.after_statement();
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lock.lock();
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assert(transaction_.active() == false);
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debug_log_state("before_command: error");
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return 1;
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}
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}
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debug_log_state("before_command: success");
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return 0;
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}
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void wsrep::client_state::after_command_before_result()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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debug_log_state("after_command_before_result: enter");
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assert(state() == s_exec);
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if (transaction_.active() &&
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transaction_.state() == wsrep::transaction::s_must_abort)
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{
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override_error(wsrep::e_deadlock_error);
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lock.unlock();
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client_service_.bf_rollback();
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(void)transaction_.after_statement();
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lock.lock();
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assert(transaction_.state() == wsrep::transaction::s_aborted);
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assert(current_error() != wsrep::e_success);
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}
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state(lock, s_result);
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debug_log_state("after_command_before_result: leave");
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}
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void wsrep::client_state::after_command_after_result()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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debug_log_state("after_command_after_result_enter");
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assert(state() == s_result);
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assert(transaction_.state() != wsrep::transaction::s_aborting);
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if (transaction_.active() &&
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transaction_.state() == wsrep::transaction::s_must_abort)
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{
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lock.unlock();
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client_service_.bf_rollback();
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lock.lock();
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assert(transaction_.state() == wsrep::transaction::s_aborted);
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override_error(wsrep::e_deadlock_error);
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}
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else if (transaction_.active() == false)
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{
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current_error_ = wsrep::e_success;
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}
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sync_wait_gtid_ = wsrep::gtid::undefined();
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state(lock, s_idle);
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debug_log_state("after_command_after_result: leave");
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}
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int wsrep::client_state::before_statement()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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debug_log_state("before_statement: enter");
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#if 0
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/**
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* @todo It might be beneficial to implement timed wait for
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* server synced state.
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*/
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if (allow_dirty_reads_ == false &&
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server_state_.state() != wsrep::server_state::s_synced)
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{
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return 1;
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}
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#endif // 0
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if (transaction_.active() &&
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transaction_.state() == wsrep::transaction::s_must_abort)
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{
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// Rollback and cleanup will happen in after_command_before_result()
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debug_log_state("before_statement_error");
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return 1;
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}
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debug_log_state("before_statement: success");
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return 0;
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}
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int wsrep::client_state::after_statement()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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debug_log_state("after_statement: enter");
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assert(state() == s_exec);
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assert(mode() == m_local);
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if (transaction_.active() &&
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transaction_.state() == wsrep::transaction::s_must_abort)
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{
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lock.unlock();
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client_service_.bf_rollback();
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lock.lock();
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assert(transaction_.state() == wsrep::transaction::s_aborted);
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// Error may be set already. For example, if fragment size
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// exceeded the maximum size in certify_fragment(), then
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// we already have wsrep::e_error_during_commit
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if (current_error() == wsrep::e_success)
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{
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override_error(wsrep::e_deadlock_error);
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}
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}
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lock.unlock();
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(void)transaction_.after_statement();
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if (current_error() == wsrep::e_deadlock_error)
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{
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if (mode_ == m_local)
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{
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debug_log_state("after_statement: may_retry");
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return 1;
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}
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else
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{
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debug_log_state("after_statement: error");
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return 1;
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}
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}
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debug_log_state("after_statement: success");
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return 0;
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}
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//////////////////////////////////////////////////////////////////////////////
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// Rollbacker synchronization //
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//////////////////////////////////////////////////////////////////////////////
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void wsrep::client_state::sync_rollback_complete()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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debug_log_state("sync_rollback_complete: enter");
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assert(state_ == s_idle && mode_ == m_local &&
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transaction_.state() == wsrep::transaction::s_aborted);
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set_rollbacker_active(false);
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cond_.notify_all();
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debug_log_state("sync_rollback_complete: leave");
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}
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void wsrep::client_state::wait_rollback_complete_and_acquire_ownership()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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debug_log_state("wait_rollback_complete_and_acquire_ownership: enter");
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if (state_ == s_idle)
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{
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do_wait_rollback_complete_and_acquire_ownership(lock);
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}
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assert(state_ == s_exec);
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debug_log_state("wait_rollback_complete_and_acquire_ownership: leave");
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}
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//////////////////////////////////////////////////////////////////////////////
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// Streaming //
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//////////////////////////////////////////////////////////////////////////////
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void wsrep::client_state::streaming_params(
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enum wsrep::streaming_context::fragment_unit fragment_unit,
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size_t fragment_size)
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{
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assert(mode_ == m_local);
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transaction_.streaming_context().params(fragment_unit, fragment_size);
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}
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int wsrep::client_state::enable_streaming(
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enum wsrep::streaming_context::fragment_unit
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fragment_unit,
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size_t fragment_size)
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{
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assert(mode_ == m_local);
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if (transaction_.is_streaming() &&
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transaction_.streaming_context().fragment_unit() !=
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fragment_unit)
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{
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wsrep::log_error()
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<< "Changing fragment unit for active streaming transaction "
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<< "not allowed";
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return 1;
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}
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transaction_.streaming_context().enable(fragment_unit, fragment_size);
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return 0;
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}
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void wsrep::client_state::disable_streaming()
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{
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assert(mode_ == m_local);
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assert(state_ == s_exec || state_ == s_quitting);
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transaction_.streaming_context().disable();
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}
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//////////////////////////////////////////////////////////////////////////////
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// TOI //
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//////////////////////////////////////////////////////////////////////////////
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enum wsrep::provider::status
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wsrep::client_state::poll_enter_toi(
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wsrep::unique_lock<wsrep::mutex>& lock,
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const wsrep::key_array& keys,
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const wsrep::const_buffer& buffer,
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int flags,
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std::chrono::time_point<wsrep::clock> wait_until)
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{
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enum wsrep::provider::status status;
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do
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{
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lock.unlock();
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status = provider().enter_toi(id_, keys, buffer, toi_meta_, flags);
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if (status != wsrep::provider::success &&
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not toi_meta_.gtid().is_undefined())
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{
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// Successfully entered TOI, but the provider reported failure.
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// This may happen for example if certification fails.
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// Leave TOI before proceeding.
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if (provider().leave_toi(id_, wsrep::mutable_buffer()))
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{
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wsrep::log_warning()
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<< "Failed to leave TOI after failure in "
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<< "poll_enter_toi()";
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}
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toi_meta_ = wsrep::ws_meta();
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}
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if (status == wsrep::provider::error_certification_failed)
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{
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::usleep(100000);
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}
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lock.lock();
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}
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while (status == wsrep::provider::error_certification_failed &&
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wait_until.time_since_epoch().count() &&
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wait_until < wsrep::clock::now() &&
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not client_service_.interrupted(lock));
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return status;
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}
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void wsrep::client_state::enter_toi_common(
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wsrep::unique_lock<wsrep::mutex>& lock)
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{
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assert(lock.owns_lock());
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toi_mode_ = mode_;
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mode(lock, m_toi);
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}
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int wsrep::client_state::enter_toi_local(const wsrep::key_array& keys,
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const wsrep::const_buffer& buffer,
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std::chrono::time_point<wsrep::clock> wait_until)
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{
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debug_log_state("enter_toi_local: enter");
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assert(state_ == s_exec);
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assert(mode_ == m_local);
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int ret;
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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auto const status(poll_enter_toi(
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lock, keys, buffer,
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wsrep::provider::flag::start_transaction |
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wsrep::provider::flag::commit,
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wait_until));
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switch (status)
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{
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case wsrep::provider::success:
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{
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enter_toi_common(lock);
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ret = 0;
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break;
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}
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default:
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override_error(wsrep::e_error_during_commit,
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wsrep::provider::error_certification_failed);
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ret = 1;
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break;
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}
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debug_log_state("enter_toi_local: leave");
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return ret;
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}
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void wsrep::client_state::enter_toi_mode(const wsrep::ws_meta& ws_meta)
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{
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debug_log_state("enter_toi_mode: enter");
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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assert(mode_ == m_high_priority);
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enter_toi_common(lock);
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toi_meta_ = ws_meta;
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debug_log_state("enter_toi_mode: leave");
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}
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void wsrep::client_state::leave_toi_common()
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{
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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mode(lock, toi_mode_);
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toi_mode_ = m_undefined;
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if (toi_meta_.gtid().is_undefined() == false)
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{
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update_last_written_gtid(toi_meta_.gtid());
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}
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toi_meta_ = wsrep::ws_meta();
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}
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int wsrep::client_state::leave_toi_local(const wsrep::mutable_buffer& err)
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{
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debug_log_state("leave_toi_local: enter");
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assert(toi_mode_ == m_local);
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leave_toi_common();
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debug_log_state("leave_toi_local: leave");
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return (provider().leave_toi(id_, err) == provider::success ? 0 : 1);
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}
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void wsrep::client_state::leave_toi_mode()
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{
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debug_log_state("leave_toi_mode: enter");
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assert(toi_mode_ == m_high_priority);
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leave_toi_common();
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debug_log_state("leave_toi_mode: leave");
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}
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///////////////////////////////////////////////////////////////////////////////
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// RSU //
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///////////////////////////////////////////////////////////////////////////////
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int wsrep::client_state::begin_rsu(int timeout)
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{
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if (server_state_.desync())
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{
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wsrep::log_warning() << "Failed to desync server";
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return 1;
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}
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if (server_state_.server_service().wait_committing_transactions(timeout))
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{
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wsrep::log_warning() << "RSU failed due to pending transactions";
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server_state_.resync();
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return 1;
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}
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wsrep::seqno pause_seqno(server_state_.pause());
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if (pause_seqno.is_undefined())
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{
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wsrep::log_warning() << "Failed to pause provider";
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server_state_.resync();
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return 1;
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}
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wsrep::log_info() << "Provider paused at: " << pause_seqno;
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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toi_mode_ = mode_;
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mode(lock, m_rsu);
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return 0;
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}
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int wsrep::client_state::end_rsu()
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{
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int ret(0);
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try
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{
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server_state_.resume();
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server_state_.resync();
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}
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catch (const wsrep::runtime_error& e)
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{
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wsrep::log_warning() << "End RSU failed: " << e.what();
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ret = 1;
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}
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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mode(lock, toi_mode_);
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return ret;
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}
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///////////////////////////////////////////////////////////////////////////////
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// NBO //
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///////////////////////////////////////////////////////////////////////////////
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int wsrep::client_state::begin_nbo_phase_one(
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const wsrep::key_array& keys,
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const wsrep::const_buffer& buffer,
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std::chrono::time_point<wsrep::clock> wait_until)
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{
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debug_log_state("begin_nbo_phase_one: enter");
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debug_log_keys(keys);
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wsrep::unique_lock<wsrep::mutex> lock(mutex_);
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assert(state_ == s_exec);
|
|
assert(mode_ == m_local);
|
|
assert(toi_mode_ == m_undefined);
|
|
|
|
int ret;
|
|
auto const status(poll_enter_toi(
|
|
lock, keys, buffer,
|
|
wsrep::provider::flag::start_transaction,
|
|
wait_until));
|
|
switch (status)
|
|
{
|
|
case wsrep::provider::success:
|
|
toi_mode_ = mode_;
|
|
mode(lock, m_nbo);
|
|
ret= 0;
|
|
break;
|
|
default:
|
|
override_error(e_deadlock_error, status);
|
|
if (!toi_meta_.seqno().is_undefined())
|
|
{
|
|
// TODO(leandro): do we need to pass sth here? is leave_toi necessary here? enter_toi_local doesn't do it.
|
|
wsrep::mutable_buffer err;
|
|
provider().leave_toi(id_, err);
|
|
}
|
|
toi_meta_ = wsrep::ws_meta();
|
|
ret= 1;
|
|
break;
|
|
}
|
|
debug_log_state("begin_nbo_phase_one: leave");
|
|
return ret;
|
|
}
|
|
|
|
int wsrep::client_state::end_nbo_phase_one(const wsrep::mutable_buffer& err)
|
|
{
|
|
debug_log_state("end_nbo_phase_one: enter");
|
|
assert(state_ == s_exec);
|
|
assert(mode_ == m_nbo);
|
|
assert(in_toi());
|
|
|
|
enum wsrep::provider::status status(provider().leave_toi(id_, err));
|
|
wsrep::unique_lock<wsrep::mutex> lock(mutex_);
|
|
int ret;
|
|
switch (status)
|
|
{
|
|
case wsrep::provider::success:
|
|
ret = 0;
|
|
break;
|
|
default:
|
|
override_error(e_error_during_commit, status);
|
|
ret = 1;
|
|
break;
|
|
}
|
|
nbo_meta_ = toi_meta_;
|
|
toi_meta_ = wsrep::ws_meta();
|
|
toi_mode_ = m_undefined;
|
|
debug_log_state("end_nbo_phase_one: leave");
|
|
return ret;
|
|
}
|
|
|
|
int wsrep::client_state::enter_nbo_mode(const wsrep::ws_meta& ws_meta)
|
|
{
|
|
assert(state_ == s_exec);
|
|
assert(mode_ == m_local);
|
|
assert(toi_mode_ == m_undefined);
|
|
wsrep::unique_lock<wsrep::mutex> lock(mutex_);
|
|
nbo_meta_ = ws_meta;
|
|
mode(lock, m_nbo);
|
|
return 0;
|
|
}
|
|
|
|
int wsrep::client_state::begin_nbo_phase_two(const wsrep::key_array& keys)
|
|
{
|
|
debug_log_state("begin_nbo_phase_two: enter");
|
|
debug_log_keys(keys);
|
|
assert(state_ == s_exec);
|
|
assert(mode_ == m_nbo);
|
|
assert(toi_mode_ == m_undefined);
|
|
assert(!in_toi());
|
|
|
|
wsrep::unique_lock<wsrep::mutex> lock(mutex_);
|
|
// Note: nbo_meta_ is passed to enter_toi() as it is
|
|
// an input param containing gtid of NBO begin.
|
|
// Output stored in nbo_meta_ is copied to toi_meta_ for
|
|
// phase two end.
|
|
enum wsrep::provider::status status(
|
|
provider().enter_toi(id_, keys,
|
|
wsrep::const_buffer(), nbo_meta_,
|
|
wsrep::provider::flag::commit));
|
|
int ret;
|
|
switch (status)
|
|
{
|
|
case wsrep::provider::success:
|
|
ret= 0;
|
|
toi_meta_ = nbo_meta_;
|
|
toi_mode_ = m_local;
|
|
break;
|
|
default:
|
|
override_error(e_error_during_commit, status);
|
|
// Failed to grab TOI for completing NBO in order. This means that
|
|
// the operation cannot be ended in total order, so we end the
|
|
// NBO mode and let the DBMS to deal with the error.
|
|
mode(lock, m_local);
|
|
ret= 1;
|
|
break;
|
|
}
|
|
debug_log_state("begin_nbo_phase_two: leave");
|
|
return ret;
|
|
}
|
|
|
|
int wsrep::client_state::end_nbo_phase_two(const wsrep::mutable_buffer& err)
|
|
{
|
|
debug_log_state("end_nbo_phase_two: enter");
|
|
assert(state_ == s_exec);
|
|
assert(mode_ == m_nbo);
|
|
assert(toi_mode_ == m_local);
|
|
assert(in_toi());
|
|
enum wsrep::provider::status status(
|
|
provider().leave_toi(id_, err));
|
|
wsrep::unique_lock<wsrep::mutex> lock(mutex_);
|
|
int ret;
|
|
switch (status)
|
|
{
|
|
case wsrep::provider::success:
|
|
ret = 0;
|
|
break;
|
|
default:
|
|
override_error(e_error_during_commit, status);
|
|
ret = 1;
|
|
break;
|
|
}
|
|
toi_meta_ = wsrep::ws_meta();
|
|
toi_mode_ = m_undefined;
|
|
nbo_meta_ = wsrep::ws_meta();
|
|
mode(lock, m_local);
|
|
debug_log_state("end_nbo_phase_two: leave");
|
|
return ret;
|
|
}
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// Misc //
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
int wsrep::client_state::sync_wait(int timeout)
|
|
{
|
|
std::pair<wsrep::gtid, enum wsrep::provider::status> result(
|
|
server_state_.causal_read(timeout));
|
|
int ret(1);
|
|
switch (result.second)
|
|
{
|
|
case wsrep::provider::success:
|
|
sync_wait_gtid_ = result.first;
|
|
ret = 0;
|
|
break;
|
|
case wsrep::provider::error_not_implemented:
|
|
override_error(wsrep::e_not_supported_error);
|
|
break;
|
|
default:
|
|
override_error(wsrep::e_timeout_error);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// Private //
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
void wsrep::client_state::do_acquire_ownership(
|
|
wsrep::unique_lock<wsrep::mutex>& lock WSREP_UNUSED)
|
|
{
|
|
assert(lock.owns_lock());
|
|
// Be strict about client state for clients in local mode. The
|
|
// owning_thread_id_ is used to detect bugs which are caused by
|
|
// more than one thread operating the client state at the time,
|
|
// for example thread handling the client session and background
|
|
// rollbacker.
|
|
assert(state_ == s_idle || mode_ != m_local);
|
|
owning_thread_id_ = wsrep::this_thread::get_id();
|
|
}
|
|
|
|
void wsrep::client_state::do_wait_rollback_complete_and_acquire_ownership(
|
|
wsrep::unique_lock<wsrep::mutex>& lock)
|
|
{
|
|
assert(lock.owns_lock());
|
|
assert(state_ == s_idle);
|
|
while (is_rollbacker_active())
|
|
{
|
|
cond_.wait(lock);
|
|
}
|
|
do_acquire_ownership(lock);
|
|
state(lock, s_exec);
|
|
}
|
|
|
|
void wsrep::client_state::update_last_written_gtid(const wsrep::gtid& gtid)
|
|
{
|
|
assert(last_written_gtid_.is_undefined() ||
|
|
(last_written_gtid_.id() == gtid.id() &&
|
|
!(last_written_gtid_.seqno() > gtid.seqno())));
|
|
last_written_gtid_ = gtid;
|
|
}
|
|
|
|
void wsrep::client_state::debug_log_state(const char* context) const
|
|
{
|
|
WSREP_LOG_DEBUG(debug_log_level(),
|
|
wsrep::log::debug_level_client_state,
|
|
context
|
|
<< "(" << id_.get()
|
|
<< "," << to_c_string(state_)
|
|
<< "," << to_c_string(mode_)
|
|
<< "," << wsrep::to_string(current_error_)
|
|
<< ",toi: " << toi_meta_.seqno()
|
|
<< ",nbo: " << nbo_meta_.seqno() << ")");
|
|
}
|
|
|
|
void wsrep::client_state::debug_log_keys(const wsrep::key_array& keys) const
|
|
{
|
|
for (const auto& k : keys)
|
|
{
|
|
WSREP_LOG_DEBUG(debug_log_level(),
|
|
wsrep::log::debug_level_client_state,
|
|
"TOI keys: "
|
|
<< " id: " << id_
|
|
<< "key: " << k);
|
|
}
|
|
}
|
|
|
|
void wsrep::client_state::state(
|
|
wsrep::unique_lock<wsrep::mutex>& lock WSREP_UNUSED,
|
|
enum wsrep::client_state::state state)
|
|
{
|
|
// Verify that the current thread has gained control to the
|
|
// connection by calling before_command()
|
|
assert(wsrep::this_thread::get_id() == owning_thread_id_);
|
|
assert(lock.owns_lock());
|
|
static const char allowed[state_max_][state_max_] =
|
|
{
|
|
/* none idle exec result quit */
|
|
{ 0, 1, 0, 0, 0}, /* none */
|
|
{ 0, 0, 1, 0, 1}, /* idle */
|
|
{ 0, 0, 0, 1, 0}, /* exec */
|
|
{ 0, 1, 0, 0, 0}, /* result */
|
|
{ 1, 0, 0, 0, 0} /* quit */
|
|
};
|
|
if (!allowed[state_][state])
|
|
{
|
|
std::ostringstream os;
|
|
os << "client_state: Unallowed state transition: "
|
|
<< state_ << " -> " << state;
|
|
wsrep::log_warning() << os.str();
|
|
assert(0);
|
|
}
|
|
state_hist_.push_back(state_);
|
|
state_ = state;
|
|
if (state_hist_.size() > 10)
|
|
{
|
|
state_hist_.erase(state_hist_.begin());
|
|
}
|
|
|
|
}
|
|
|
|
void wsrep::client_state::mode(
|
|
wsrep::unique_lock<wsrep::mutex>& lock WSREP_UNUSED,
|
|
enum mode mode)
|
|
{
|
|
assert(lock.owns_lock());
|
|
|
|
static const char allowed[n_modes_][n_modes_] =
|
|
{ /* u l h t r n */
|
|
{ 0, 0, 0, 0, 0, 0 }, /* undefined */
|
|
{ 0, 0, 1, 1, 1, 1 }, /* local */
|
|
{ 0, 1, 0, 1, 0, 1 }, /* high prio */
|
|
{ 0, 1, 1, 0, 0, 0 }, /* toi */
|
|
{ 0, 1, 0, 0, 0, 0 }, /* rsu */
|
|
{ 0, 1, 1, 0, 0, 0 } /* nbo */
|
|
};
|
|
if (!allowed[mode_][mode])
|
|
{
|
|
std::ostringstream os;
|
|
os << "client_state: Unallowed mode transition: "
|
|
<< mode_ << " -> " << mode;
|
|
wsrep::log_warning() << os.str();
|
|
assert(0);
|
|
}
|
|
mode_ = mode;
|
|
}
|