DBMS simulator runs client load

src/dbms_simulator.cpp

@@ -10,6 +10,9 @@
 
 #include "server_context.hpp"
 #include "client_context.hpp"
+#include "transaction_context.hpp"
+#include "key.hpp"
+#include "data.hpp"
 #include "provider.hpp"
 #include "condition_variable.hpp"
 #include "view.hpp"
@@ -25,24 +28,36 @@
 
 class dbms_server;
 
+struct dbms_simulator_params
+{
+    size_t n_servers;
+    size_t n_clients;
+    size_t n_transactions;
+    std::string wsrep_provider;
+    std::string wsrep_provider_options;
+    dbms_simulator_params()
+        : n_servers(0)
+        , n_clients(0)
+        , n_transactions(0)
+        , wsrep_provider()
+        , wsrep_provider_options()
+    { }
+};
+
 class dbms_simulator
 {
 public:
-    dbms_simulator(size_t n_servers,
+    dbms_simulator(const dbms_simulator_params& params)
-                   size_t n_clients,
-                   const std::string& wsrep_provider,
-                   const std::string& wsrep_provider_options)
         : mutex_()
+        , params_(params)
         , servers_()
-        , n_servers_(n_servers)
-        , n_clients_(n_clients)
-        , wsrep_provider_(wsrep_provider)
-        , wsrep_provider_options_(wsrep_provider_options)
     { }
     void start();
     void stop();
     void donate_sst(dbms_server&,
                     const std::string& req, const wsrep_gtid_t& gtid, bool);
+    const dbms_simulator_params& params() const
+    { return params_; }
 private:
     std::string server_port(size_t i) const
     {
@@ -53,11 +68,8 @@ private:
     std::string build_cluster_address() const;
 
     trrep::default_mutex mutex_;
+    const dbms_simulator_params& params_;
     std::map<size_t, std::unique_ptr<dbms_server>> servers_;
-    size_t n_servers_;
-    size_t n_clients_;
-    std::string wsrep_provider_;
-    std::string wsrep_provider_options_;
 };
 
 class dbms_client;
@@ -80,8 +92,10 @@ public:
         , cond_()
         , state_(s_disconnected)
         , last_client_id_(0)
+        , last_transaction_id_(0)
         , appliers_()
         , clients_()
+        , client_threads_()
     { }
 
     // Provider management
@@ -136,6 +150,9 @@ public:
     void on_sync()
     {
         std::cerr << "Synced with group" << "\n";
+        trrep::unique_lock<trrep::mutex> lock(mutex_);
+        state_ = s_synced;
+        cond_.notify_all();
     }
 
     std::string on_sst_request()
@@ -159,6 +176,14 @@ public:
         provider().sst_received(gtid, 0);
     }
 
+    void wait_until_state(enum state state)
+    {
+        trrep::unique_lock<trrep::mutex> lock(mutex_);
+        while (state_ != state)
+        {
+            cond_.wait(lock);
+        }
+    }
     void wait_until_connected()
     {
         trrep::unique_lock<trrep::mutex> lock(mutex_);
@@ -167,6 +192,7 @@ public:
             cond_.wait(lock);
         }
     }
+
     void wait_until_disconnected()
     {
         trrep::unique_lock<trrep::mutex> lock(mutex_);
@@ -178,47 +204,123 @@ public:
 
     // Client context management
     trrep::client_context* local_client_context();
+
+    size_t next_transaction_id()
+    {
+        return (last_transaction_id_.fetch_add(1) + 1);
+    }
+
+    void start_clients();
+    void stop_clients();
+    void client_thread(const std::shared_ptr<dbms_client>& client);
 private:
+
+    void start_client(size_t id);
+
     dbms_simulator& simulator_;
     trrep::default_mutex mutex_;
     trrep::default_condition_variable cond_;
     enum state state_;
     std::atomic<size_t> last_client_id_;
+    std::atomic<size_t> last_transaction_id_;
     std::vector<std::thread> appliers_;
     std::map<size_t, std::unique_ptr<dbms_client>> clients_;
+    std::vector<std::thread> client_threads_;
 };
 
 class dbms_client : public trrep::client_context
 {
 public:
-    dbms_client(dbms_server& server, const trrep::client_id& id,
+    dbms_client(dbms_server& server,
-                enum trrep::client_context::mode mode)
+                const trrep::client_id& id,
+                enum trrep::client_context::mode mode,
+                size_t n_transactions)
         : trrep::client_context(mutex_, server, id, mode)
         , mutex_()
+        , server_(server)
+        , n_transactions_(n_transactions)
     { }
+
+    void start()
+    {
+        for (size_t i(0); i < n_transactions_; ++i)
+        {
+            run_one_transaction();
+        }
+    }
+
     bool do_2pc() const { return false; }
     int apply(trrep::transaction_context&, const trrep::data&)
     {
+        std::cerr << "applying" << "\n";
         return 0;
     }
-    int commit(trrep::transaction_context&)
+    int commit(trrep::transaction_context& transaction_context)
     {
+        int ret(0);
+        ret = transaction_context.before_commit();
+        ret = ret || transaction_context.ordered_commit();
+        ret = ret || transaction_context.after_commit();
+        std::cerr << "commit" << "\n";
         return 0;
     }
-    int rollback(trrep::transaction_context&)
+    int rollback(trrep::transaction_context& transaction_context)
     {
+        // std::cerr << "rollback: " << transaction_context.id().get() << "\n";
+        transaction_context.before_rollback();
+        transaction_context.after_rollback();
         return 0;
     }
 private:
+
+    void run_one_transaction()
+    {
+        trrep::transaction_context trx(*this);
+        trx.start_transaction(server_.next_transaction_id());
+        std::ostringstream os;
+        os << trx.id().get();
+        trrep::key key;
+        key.append_key_part("dbms", 4);
+        wsrep_conn_id_t client_id(id().get());
+        key.append_key_part(&client_id, sizeof(client_id));
+        wsrep_trx_id_t trx_id(trx.id().get());
+
+        int err(0);
+        key.append_key_part(&trx_id, sizeof(trx_id));
+        err = trx.append_key(key);
+        std::cout << "append_key: " << err << "\n";
+        err = err || trx.append_data(trrep::data(os.str().c_str(), os.str().size()));
+        std::cout << "append_data: " << err << "\n";
+        if (do_2pc())
+        {
+            err = err || trx.before_prepare();
+            std::cout << "before_prepare: " << err << "\n";
+            err = err || trx.after_prepare();
+            std::cout << "after_prepare: " << err << "\n";
+        }
+        err = err || trx.before_commit();
+        std::cout << "before_commit: " << err << "\n";
+        err = err || trx.ordered_commit();
+        std::cout << "ordered_commit: " << err << "\n";
+        err = err || trx.after_commit();
+        std::cout << "after_commit: " << err << "\n";
+        trx.after_statement();
+
+    }
+
     trrep::default_mutex mutex_;
+    dbms_server& server_;
+    const size_t n_transactions_;
+
 };
 
 
 // Server methods
 void dbms_server::applier_thread()
 {
-    dbms_client applier(*this, ++last_client_id_,
+    trrep::client_id client_id(last_client_id_.fetch_add(1) + 1);
-                        trrep::client_context::m_applier);
+    dbms_client applier(*this, client_id,
+                        trrep::client_context::m_applier, 0);
     wsrep_status_t ret(provider().run_applier(&applier));
     std::cerr << "Applier thread exited with error code " << ret << "\n";
 }
@@ -226,22 +328,51 @@ void dbms_server::applier_thread()
 trrep::client_context* dbms_server::local_client_context()
 {
     std::ostringstream id_os;
-    size_t client_id(last_client_id_.fetch_add(1) + 1);
+    size_t client_id(++last_client_id_);
-    trrep::unique_lock<trrep::mutex> lock(mutex_);
+    return new dbms_client(*this, client_id, trrep::client_context::m_replicating, 0);
-    return clients_.insert(std::make_pair(client_id,
-                                          std::make_unique<dbms_client>(
-                                              *this, client_id,
-                                              trrep::client_context::m_replicating))).first->second.get();
 }
 
+void dbms_server::start_clients()
+{
+    size_t n_clients(simulator_.params().n_clients);
+    for (size_t i(0); i < n_clients; ++i)
+    {
+        start_client(i + 1);
+    }
+}
+
+void dbms_server::stop_clients()
+{
+    for (auto& i : client_threads_)
+    {
+        i.join();
+    }
+}
+
+void dbms_server::client_thread(const std::shared_ptr<dbms_client>& client)
+{
+    client->start();
+}
+
+void dbms_server::start_client(size_t id)
+{
+    auto client(std::make_shared<dbms_client>(
+                    *this, id,
+                    trrep::client_context::m_replicating,
+                    simulator_.params().n_transactions));
+    client_threads_.push_back(
+        std::thread(&dbms_server::client_thread, this, client));
+}
+
+
 
 void dbms_simulator::start()
 {
-    std::cout << "Provider: " << wsrep_provider_ << "\n";
+    std::cout << "Provider: " << params_.wsrep_provider << "\n";
 
     std::string cluster_address(build_cluster_address());
     std::cout << "Cluster address: " << cluster_address << "\n";
-    for (size_t i(0); i < n_servers_; ++i)
+    for (size_t i(0); i < params_.n_servers; ++i)
     {
         std::ostringstream name_os;
         name_os << (i + 1);
@@ -258,14 +389,23 @@ void dbms_simulator::start()
         boost::filesystem::create_directory(dir);
 
         dbms_server& server(*it.first->second);
-        std::string server_options(wsrep_provider_options_);
+        std::string server_options(params_.wsrep_provider_options);
         server_options += "; base_port=" + server_port(i);
-        server.load_provider(wsrep_provider_, server_options);
+        server.load_provider(params_.wsrep_provider, server_options);
         server.provider().connect("sim_cluster", cluster_address, "",
                                   i == 0);
         server.start_applier();
         server.wait_until_connected();
+        server.wait_until_state(dbms_server::s_synced);
     }
+
+    // Start client threads
+
+    for (auto& i : servers_)
+    {
+        i.second->start_clients();
+    }
+
 }
 
 void dbms_simulator::stop()
@@ -273,6 +413,7 @@ void dbms_simulator::stop()
     for (auto& i : servers_)
     {
         dbms_server& server(*i.second);
+        server.stop_clients();
         server.provider().disconnect();
         server.wait_until_disconnected();
         server.stop_applier();
@@ -303,13 +444,13 @@ void dbms_simulator::donate_sst(dbms_server& server,
 std::string dbms_simulator::build_cluster_address() const
 {
     std::string ret("gcomm://");
-    for (size_t i(0); i < n_servers_; ++i)
+    for (size_t i(0); i < params_.n_servers; ++i)
     {
         std::ostringstream sa_os;
         sa_os << "127.0.0.1:";
         sa_os << server_port(i);
         ret += sa_os.str();
-        if (i < n_servers_ - 1) ret += ",";
+        if (i < params_.n_servers - 1) ret += ",";
     }
     return ret;
 }
@@ -320,23 +461,22 @@ int main(int argc, char** argv)
 {
     try
     {
-        size_t n_servers;
+        dbms_simulator_params params;
-        size_t n_clients;
-        std::string wsrep_provider;
-        std::string wsrep_provider_options;
         po::options_description desc("Allowed options");
         desc.add_options()
             ("help", "produce help message")
             ("wsrep-provider",
-             po::value<std::string>(&wsrep_provider)->required(),
+             po::value<std::string>(&params.wsrep_provider)->required(),
              "wsrep provider to load")
             ("wsrep-provider-options",
-             po::value<std::string>(&wsrep_provider_options),
+             po::value<std::string>(&params.wsrep_provider_options),
              "wsrep provider options")
-            ("servers", po::value<size_t>(&n_servers)->required(),
+            ("servers", po::value<size_t>(&params.n_servers)->required(),
              "number of servers to start")
-            ("clients", po::value<size_t>(&n_clients)->required(),
+            ("clients", po::value<size_t>(&params.n_clients)->required(),
-             "number of clients to start per server");
+             "number of clients to start per server")
+            ("transactions", po::value<size_t>(&params.n_transactions),
+             "number of transactions run by a client");
         po::variables_map vm;
         po::store(po::parse_command_line(argc, argv, desc), vm);
         po::notify(vm);
@@ -347,7 +487,7 @@ int main(int argc, char** argv)
             return 1;
         }
 
-        dbms_simulator sim(n_servers, n_clients, wsrep_provider, wsrep_provider_options);
+        dbms_simulator sim(params);
         sim.start();
         std::this_thread::sleep_for(std::chrono::seconds(5));
         sim.stop();

src/mock_client_context.cpp

@@ -7,7 +7,7 @@
 
 
 int trrep::mock_client_context::apply(
-    trrep::transaction_context& transaction_context,
+    trrep::transaction_context& transaction_context __attribute__((unused)),
     const trrep::data& data __attribute__((unused)))
 
 {

src/transaction_context.cpp

@@ -96,7 +96,7 @@ int trrep::transaction_context::before_prepare()
     int ret(0);
 
     trrep::unique_lock<trrep::mutex> lock(client_context_.mutex());
-
+    debug_log_state();
     assert(state() == s_executing || state() == s_must_abort);
 
     if (state() == s_must_abort)
@@ -136,6 +136,7 @@ int trrep::transaction_context::before_prepare()
     }
 
     assert(state() == s_preparing);
+    debug_log_state();
     return ret;
 }
 
@@ -143,7 +144,7 @@ int trrep::transaction_context::after_prepare()
 {
     int ret(1);
     trrep::unique_lock<trrep::mutex> lock(client_context_.mutex());
-
+    debug_log_state();
     assert(state() == s_preparing || state() == s_must_abort);
     if (state() == s_must_abort)
     {
@@ -175,6 +176,7 @@ int trrep::transaction_context::after_prepare()
         ret = 0;
         break;
     }
+    debug_log_state();
     return ret;
 }
 
@@ -183,6 +185,7 @@ int trrep::transaction_context::before_commit()
     int ret(1);
 
     trrep::unique_lock<trrep::mutex> lock(client_context_.mutex());
+    debug_log_state();
     assert(state() == s_executing || state() == s_committing ||
            state() == s_must_abort);
 
@@ -253,6 +256,7 @@ int trrep::transaction_context::before_commit()
         }
         break;
     }
+    debug_log_state();
     return ret;
 }
 
@@ -261,12 +265,14 @@ int trrep::transaction_context::ordered_commit()
     int ret(1);
 
     trrep::unique_lock<trrep::mutex> lock(client_context_.mutex());
+    debug_log_state();
     assert(state() == s_committing);
     assert(ordered());
     ret = provider_.commit_order_leave(&ws_handle_);
     // Should always succeed
     assert(ret == 0);
     state(lock, s_ordered_commit);
+    debug_log_state();
     return ret;
 }
 
@@ -275,7 +281,7 @@ int trrep::transaction_context::after_commit()
     int ret(0);
 
     trrep::unique_lock<trrep::mutex> lock(client_context_.mutex());
-
+    debug_log_state();
     assert(state() == s_ordered_commit);
 
     switch (client_context_.mode())
@@ -295,13 +301,14 @@ int trrep::transaction_context::after_commit()
     }
     assert(ret == 0);
     state(lock, s_committed);
+    debug_log_state();
     return ret;
 }
 
 int trrep::transaction_context::before_rollback()
 {
     trrep::unique_lock<trrep::mutex> lock(client_context_.mutex());
-
+    debug_log_state();
     assert(state() == s_executing ||
            state() == s_must_abort ||
            state() == s_cert_failed ||
@@ -347,13 +354,14 @@ int trrep::transaction_context::before_rollback()
         assert(0);
         break;
     }
+    debug_log_state();
     return 0;
 }
 
 int trrep::transaction_context::after_rollback()
 {
     trrep::unique_lock<trrep::mutex> lock(client_context_.mutex());
-
+    debug_log_state();
     assert(state() == s_aborting ||
            state() == s_must_replay);
 
@@ -368,6 +376,7 @@ int trrep::transaction_context::after_rollback()
     // during actual rollback. If the transaction has been ordered,
     // releasing the commit ordering critical section should be
     // also postponed until all resources have been released.
+    debug_log_state();
     return 0;
 }
 
@@ -375,11 +384,12 @@ int trrep::transaction_context::after_statement()
 {
     int ret(0);
     trrep::unique_lock<trrep::mutex> lock(client_context_.mutex());
-
+    debug_log_state();
     assert(state() == s_executing ||
            state() == s_committed ||
            state() == s_aborted ||
            state() == s_must_abort ||
+           state() == s_cert_failed ||
            state() == s_must_replay);
 
     switch (state())
@@ -394,7 +404,10 @@ int trrep::transaction_context::after_statement()
         }
         break;
     case s_must_abort:
+    case s_cert_failed:
+        lock.unlock();
         ret = client_context_.rollback(*this);
+        lock.lock();
         break;
     case s_aborted:
         break;
@@ -425,6 +438,7 @@ int trrep::transaction_context::after_statement()
         cleanup();
     }
 
+    debug_log_state();
     return ret;
 }
 
@@ -587,6 +601,7 @@ int trrep::transaction_context::certify_commit(
     assert(state() == s_certifying || state() == s_must_abort);
     client_context_.debug_sync("wsrep_after_replication");
 
+    std::cout << "seqno: " << trx_meta_.gtid.seqno << "\n";
     int ret(1);
     switch (cert_ret)
     {
@@ -690,3 +705,10 @@ void trrep::transaction_context::cleanup()
     certified_ = false;
     pa_unsafe_ = false;
 }
+
+void trrep::transaction_context::debug_log_state() const
+{
+    std::cout << "client: " << client_context_.id().get()
+              << " trx: " << id_.get()
+              << " state: " << state_ << "\n";
+}

src/transaction_context.hpp

@@ -133,6 +133,7 @@ namespace trrep
         void remove_fragments();
         void clear_fragments();
         void cleanup();
+        void debug_log_state() const;
         trrep::provider& provider_;
         trrep::client_context& client_context_;
         trrep::transaction_id id_;

src/wsrep_provider_v26.cpp

@@ -68,6 +68,44 @@ wsrep_status_t trrep::wsrep_provider_v26::run_applier(void *applier_ctx)
     return wsrep_->recv(wsrep_, applier_ctx);
 }
 
+int trrep::wsrep_provider_v26::append_key(wsrep_ws_handle_t* wsh,
+                                          const wsrep_key_t* key)
+{
+    return (wsrep_->append_key(wsrep_, wsh, key, 1, WSREP_KEY_EXCLUSIVE, true)
+            != WSREP_OK);
+}
+
+int trrep::wsrep_provider_v26::append_data(wsrep_ws_handle_t* wsh,
+                                           const wsrep_buf_t* data)
+{
+    return (wsrep_->append_data(wsrep_, wsh, data, 1, WSREP_DATA_ORDERED, true)
+            != WSREP_OK);
+}
+
+wsrep_status_t trrep::wsrep_provider_v26::certify(wsrep_conn_id_t conn_id,
+                                                  wsrep_ws_handle_t* wsh,
+                                                  uint32_t flags,
+                                                  wsrep_trx_meta_t* meta)
+{
+    return wsrep_->certify(wsrep_, conn_id, wsh, flags, meta);
+}
+
+wsrep_status_t trrep::wsrep_provider_v26::commit_order_enter(
+    wsrep_ws_handle_t* wsh)
+{
+    return wsrep_->commit_order_enter(wsrep_, wsh);
+}
+
+int trrep::wsrep_provider_v26::commit_order_leave(wsrep_ws_handle_t* wsh)
+{
+    return (wsrep_->commit_order_leave(wsrep_, wsh, 0) != WSREP_OK);
+}
+
+int trrep::wsrep_provider_v26::release(wsrep_ws_handle_t* wsh)
+{
+    return (wsrep_->release(wsrep_, wsh) != WSREP_OK);
+}
+
 int trrep::wsrep_provider_v26::sst_sent(const wsrep_gtid_t& gtid, int err)
 {
     if (wsrep_->sst_sent(wsrep_, &gtid, err) != WSREP_OK)

src/wsrep_provider_v26.hpp

@@ -23,19 +23,19 @@ namespace trrep
 
         wsrep_status_t run_applier(void*);
         int start_transaction(wsrep_ws_handle_t*) { return 0; }
-        int append_key(wsrep_ws_handle_t*, const wsrep_key_t*) { return 0; }
+        int append_key(wsrep_ws_handle_t*, const wsrep_key_t*);
-        int append_data(wsrep_ws_handle_t*, const wsrep_buf_t*) { return 0; }
+        int append_data(wsrep_ws_handle_t*, const wsrep_buf_t*);
         wsrep_status_t
         certify(wsrep_conn_id_t, wsrep_ws_handle_t*,
                 uint32_t,
-                wsrep_trx_meta_t*) { return WSREP_OK; }
+                wsrep_trx_meta_t*);
         wsrep_status_t bf_abort(wsrep_seqno_t,
                                 wsrep_trx_id_t,
                                 wsrep_seqno_t*) { return WSREP_OK; }
         int rollback(const wsrep_trx_id_t) { return 0; }
-        wsrep_status commit_order_enter(wsrep_ws_handle_t*) { return WSREP_OK; }
+        wsrep_status commit_order_enter(wsrep_ws_handle_t*);
-        int commit_order_leave(wsrep_ws_handle_t*) { return 0; }
+        int commit_order_leave(wsrep_ws_handle_t*);
-        int release(wsrep_ws_handle_t*) { return 0; }
+        int release(wsrep_ws_handle_t*);
         int sst_sent(const wsrep_gtid_t&,int);
         int sst_received(const wsrep_gtid_t& gtid, int);
     private: