599 lines
14 KiB
C++
599 lines
14 KiB
C++
/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2025-01-18
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#include <iostream>
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#include <iterator>
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#include <string>
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#include <sstream>
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#include <thread>
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#include <vector>
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#include <random>
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#include <maxtest/testconnections.hh>
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#include "fail_switch_rejoin_common.cpp"
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using namespace std;
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// How often the monitor checks the server state.
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// NOTE: Ensure this is identical with the value in the configuration file.
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const time_t MONITOR_INTERVAL = 1;
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// After how many seconds should the failover/rejoin operation surely have
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// been performed. Not very critical.
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const time_t FAILOVER_DURATION = 5;
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// The test now runs only two failovers. Change for a longer time limit later.
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// TODO: add semisync to remove this limitation.
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// Number of backends
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const int N = 4;
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#define CMESSAGE(msg) \
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do { \
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stringstream ss; \
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ss << "client(" << m_id << ") : " << msg << "\n"; \
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cout << ss.str() << flush; \
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} while (false)
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#if !defined (NDEBUG)
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#define ss_dassert(x) do {if (!(x)) {fprintf(stderr, "Assertion failed: %s\n", #x); abort();}} while (false)
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#define ss_debug(x) x
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#else
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#define ss_dassert(s)
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#define ss_debug(x)
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#endif
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namespace
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{
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class Client
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{
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public:
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enum
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{
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DEFAULT_N_CLIENTS = 4,
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DEFAULT_N_ROWS = 100
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};
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static void init(TestConnections& test, size_t nClients, size_t nRows)
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{
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s_nClients = nClients;
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s_nRows = nRows;
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if (create_tables(test))
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{
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if (insert_data(test))
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{
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cout << "\nSyncing slaves." << endl;
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test.repl->sync_slaves();
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}
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}
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}
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static void start(bool verbose,
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const char* zHost,
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int port,
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const char* zUser,
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const char* zPassword)
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{
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for (size_t i = 0; i < s_nClients; ++i)
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{
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s_threads.push_back(std::thread(&Client::thread_main,
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i,
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verbose,
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zHost,
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port,
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zUser,
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zPassword));
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}
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}
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static void stop()
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{
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s_shutdown = true;
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for (size_t i = 0; i < s_nClients; ++i)
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{
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s_threads[i].join();
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}
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}
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private:
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Client(int id, bool verbose)
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: m_id(id)
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, m_verbose(verbose)
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, m_value(1)
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, m_rand_dist(0.0, 1.0)
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{
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}
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enum action_t
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{
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ACTION_SELECT,
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ACTION_UPDATE
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};
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action_t action() const
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{
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double d = random_decimal_fraction();
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// 20% updates
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// 80% selects
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if (d <= 0.2)
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{
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return ACTION_UPDATE;
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}
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else
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{
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return ACTION_SELECT;
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}
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}
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bool run(MYSQL* pConn)
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{
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bool rv = false;
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switch (action())
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{
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case ACTION_SELECT:
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rv = run_select(pConn);
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break;
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case ACTION_UPDATE:
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rv = run_update(pConn);
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break;
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default:
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ss_dassert(!true);
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}
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return rv;
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}
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bool run_select(MYSQL* pConn)
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{
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bool rv = true;
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string stmt("SELECT * FROM test.t");
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stmt += std::to_string(m_id);
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stmt += " WHERE id=";
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stmt += std::to_string(get_random_id());
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if (mysql_query(pConn, stmt.c_str()) == 0)
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{
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flush_response(pConn);
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}
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else
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{
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if (m_verbose)
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{
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CMESSAGE("\"" << stmt << "\" failed: " << mysql_error(pConn));
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}
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rv = false;
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}
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return rv;
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}
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bool run_update(MYSQL* pConn)
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{
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bool rv = true;
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string stmt("UPDATE test.t");
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stmt += std::to_string(m_id);
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stmt += " SET id=";
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stmt += std::to_string(m_value);
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stmt += " WHERE id=";
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stmt += std::to_string(get_random_id());
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m_value = (m_value + 1) % s_nRows;
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if (mysql_query(pConn, stmt.c_str()) == 0)
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{
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flush_response(pConn);
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}
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else
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{
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if (m_verbose)
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{
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CMESSAGE("\"" << stmt << "\" failed: " << mysql_error(pConn));
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}
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rv = false;
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}
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return rv;
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}
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static void flush_response(MYSQL* pConn)
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{
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do
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{
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MYSQL_RES* pRes = mysql_store_result(pConn);
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mysql_free_result(pRes);
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}
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while (mysql_next_result(pConn) == 0);
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}
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int get_random_id() const
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{
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int id = s_nRows * random_decimal_fraction();
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ss_dassert(id >= 0);
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ss_dassert(id <= (int)s_nRows);
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return id;
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}
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double random_decimal_fraction() const
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{
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return m_rand_dist(m_rand_gen);
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}
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void run(const char* zHost, int port, const char* zUser, const char* zPassword)
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{
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do
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{
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MYSQL* pMysql = mysql_init(NULL);
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if (pMysql)
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{
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unsigned int timeout = 5;
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mysql_options(pMysql, MYSQL_OPT_CONNECT_TIMEOUT, &timeout);
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mysql_options(pMysql, MYSQL_OPT_READ_TIMEOUT, &timeout);
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mysql_options(pMysql, MYSQL_OPT_WRITE_TIMEOUT, &timeout);
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if (m_verbose)
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{
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CMESSAGE("Connecting");
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}
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if (mysql_real_connect(pMysql, zHost, zUser, zPassword, "test", port, NULL, 0))
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{
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if (m_verbose)
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{
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CMESSAGE("Connected.");
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}
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while (!s_shutdown && run(pMysql))
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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 (m_verbose)
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{
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CMESSAGE("mysql_real_connect() failed: " << mysql_error(pMysql));
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}
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}
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if (m_verbose)
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{
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CMESSAGE("Closing");
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}
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mysql_close(pMysql);
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}
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else
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{
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CMESSAGE("mysql_init() failed.");
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}
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// To prevent some backend from becoming overwhelmed.
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sleep(1);
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}
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while (!s_shutdown);
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}
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static void thread_main(int i,
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bool verbose,
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const char* zHost,
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int port,
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const char* zUser,
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const char* zPassword)
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{
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if (mysql_thread_init() == 0)
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{
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Client client(i, verbose);
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client.run(zHost, port, zUser, zPassword);
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mysql_thread_end();
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}
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else
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{
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int m_id = i;
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CMESSAGE("mysql_thread_init() failed.");
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}
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}
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static bool create_tables(TestConnections& test)
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{
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cout << "\nCreating tables." << endl;
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MYSQL* pConn = test.maxscales->conn_rwsplit[0];
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string drop_head("DROP TABLE IF EXISTS test.t");
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string create_head("CREATE TABLE test.t");
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string create_tail(" (id INT)");
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for (size_t i = 0; i < s_nClients; ++i)
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{
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string drop = drop_head + std::to_string(i);
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test.try_query(pConn, "%s", drop.c_str());
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string create = create_head + std::to_string(i) + create_tail;
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test.try_query(pConn, "%s", create.c_str());
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}
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return test.ok();
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}
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static bool insert_data(TestConnections& test)
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{
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cout << "\nInserting data." << endl;
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MYSQL* pConn = test.maxscales->conn_rwsplit[0];
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for (size_t i = 0; i < s_nClients; ++i)
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{
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string insert("insert into test.t");
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insert += std::to_string(i);
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insert += " values ";
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for (size_t j = 0; j < s_nRows; ++j)
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{
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insert += "(";
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insert += std::to_string(j);
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insert += ")";
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if (j < s_nRows - 1)
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{
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insert += ", ";
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}
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}
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test.try_query(pConn, "%s", insert.c_str());
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}
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return test.ok();
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}
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private:
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enum
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{
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INITSTATE_SIZE = 32
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};
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size_t m_id;
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bool m_verbose;
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size_t m_value;
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mutable std::mt19937 m_rand_gen;
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mutable std::uniform_real_distribution<double> m_rand_dist;
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static size_t s_nClients;
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static size_t s_nRows;
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static bool s_shutdown;
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static std::vector<std::thread> s_threads;
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};
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size_t Client::s_nClients;
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size_t Client::s_nRows;
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bool Client::s_shutdown;
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std::vector<std::thread> Client::s_threads;
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}
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namespace
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{
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void list_servers(TestConnections& test)
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{
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test.maxscales->execute_maxadmin_command_print(0, (char*)"list servers");
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}
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void sleep(int s)
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{
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cout << "Sleeping " << s << " times 1 second" << flush;
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do
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{
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::sleep(1);
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cout << "." << flush;
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--s;
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}
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while (s > 0);
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cout << endl;
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}
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bool check_server_status(TestConnections& test, int id)
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{
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bool is_master = false;
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Mariadb_nodes* pRepl = test.repl;
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string server = string("server") + std::to_string(id);
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StringSet statuses = test.get_server_status(server.c_str());
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std::ostream_iterator<string> oi(cout, " ");
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cout << server << ": ";
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std::copy(statuses.begin(), statuses.end(), oi);
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cout << " => ";
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if (statuses.count("Master"))
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{
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is_master = true;
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cout << "OK";
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}
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else if (statuses.count("Slave"))
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{
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cout << "OK";
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}
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else if (statuses.count("Running"))
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{
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MYSQL* pConn = pRepl->nodes[id - 1];
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char result[1024];
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if (find_field(pConn, "SHOW SLAVE STATUS", "Last_IO_Error", result) == 0)
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{
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const char needle[] =
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", which is not in the master's binlog. "
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"Since the master's binlog contains GTIDs with higher sequence numbers, "
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"it probably means that the slave has diverged due to executing extra "
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"erroneous transactions";
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if (strstr(result, needle))
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{
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// A rejoin was attempted, but it failed because the node (old master)
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// had events that were not present in the new master. That is, a rejoin
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// is not possible in principle without corrective action.
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cout << "OK (could not be joined due to GTID issue)";
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}
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else
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{
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cout << result;
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test.expect(false, "Merely 'Running' node did not error in expected way.");
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}
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}
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else
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{
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test.expect(false, "Could not execute \"SHOW SLAVE STATUS\"");
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}
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}
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else
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{
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test.expect(false, "Unexpected server state for %s.", server.c_str());
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}
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cout << endl;
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return is_master;
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}
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void check_server_statuses(TestConnections& test)
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{
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int masters = 0;
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masters += check_server_status(test, 1);
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masters += check_server_status(test, 2);
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masters += check_server_status(test, 3);
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masters += check_server_status(test, 4);
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if (masters == 0)
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{
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test.global_result = 0;
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test.tprintf("No master, checking that autofail has been turned off.");
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test.log_includes(0, "disabling automatic failover");
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}
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else if (masters != 1)
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{
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test.expect(!true, "Unexpected number of masters: %d", masters);
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}
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}
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bool is_valid_server_id(TestConnections& test, int id)
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{
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std::set<int> ids;
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test.repl->connect();
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for (int i = 0; i < N; i++)
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{
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ids.insert(test.repl->get_server_id(i));
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}
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test.repl->disconnect();
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return ids.count(id);
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}
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void run(TestConnections& test)
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{
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cout << "\nConnecting to MaxScale." << endl;
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test.maxscales->connect_maxscale();
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Client::init(test, Client::DEFAULT_N_CLIENTS, Client::DEFAULT_N_ROWS);
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if (test.ok())
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{
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const char* zHost = test.maxscales->IP[0];
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int port = test.maxscales->rwsplit_port[0];
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const char* zUser = test.maxscales->user_name;
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const char* zPassword = test.maxscales->password;
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cout << "Connecting to " << zHost << ":" << port << " as " << zUser << ":" << zPassword << endl;
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cout << "Starting clients." << endl;
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Client::start(test.verbose, zHost, port, zUser, zPassword);
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list_servers(test);
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for (int i = 0; i < 2; i++)
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{
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test.set_timeout(20);
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test.maxscales->wait_for_monitor();
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int master_id = get_master_server_id(test);
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if (is_valid_server_id(test, master_id))
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{
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test.set_timeout(20);
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cout << "\nStopping node: " << master_id << endl;
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test.repl->stop_node(master_id - 1);
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test.maxscales->wait_for_monitor();
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list_servers(test);
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test.maxscales->wait_for_monitor();
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list_servers(test);
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test.set_timeout(20);
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test.maxscales->wait_for_monitor();
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cout << "\nStarting node: " << master_id << endl;
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test.repl->start_node(master_id - 1);
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test.maxscales->wait_for_monitor();
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list_servers(test);
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test.maxscales->wait_for_monitor();
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list_servers(test);
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}
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else
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{
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test.expect(false, "Unexpected master id: %d", master_id);
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}
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}
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test.maxscales->wait_for_monitor();
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cout << "\nStopping clients.\n" << flush;
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Client::stop();
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test.repl->close_connections();
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test.repl->connect();
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check_server_statuses(test);
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}
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}
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}
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int main(int argc, char* argv[])
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{
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Mariadb_nodes::require_gtid(true);
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TestConnections test(argc, argv);
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run(test);
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return test.global_result;
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}
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