コード例 #1
0
ファイル: replica_2pc.cpp プロジェクト: asd1355215911/rDSN
void replica::init_prepare(mutation_ptr& mu)
{
    dassert (PS_PRIMARY == status(), "");

    error_code err = ERR_OK;
    uint8_t count = 0;

    if (static_cast<int>(_primary_states.membership.secondaries.size()) + 1 < _options.mutation_2pc_min_replica_count)
    {
        err = ERR_NOT_ENOUGH_MEMBER;
        goto ErrOut;
    }

    mu->data.header.last_committed_decree = last_committed_decree();
    if (mu->data.header.decree == invalid_decree)
    {
        mu->set_id(get_ballot(), _prepare_list->max_decree() + 1);
    }
    else
    {
        mu->set_id(get_ballot(), mu->data.header.decree);
    }

    ddebug("%s: mutation %s init_prepare", name(), mu->name());

    // check bounded staleness
    if (mu->data.header.decree > last_committed_decree() + _options.staleness_for_commit)
    {
        err = ERR_CAPACITY_EXCEEDED;
        goto ErrOut;
    }

    dassert (mu->data.header.decree > last_committed_decree(), "");

    // local prepare
    err = _prepare_list->prepare(mu, PS_PRIMARY);
    if (err != ERR_OK)
    {
        goto ErrOut;
    }

    // remote prepare
    mu->set_prepare_ts();
    mu->set_left_secondary_ack_count((unsigned int)_primary_states.membership.secondaries.size());
    for (auto it = _primary_states.membership.secondaries.begin(); it != _primary_states.membership.secondaries.end(); it++)
    {
        send_prepare_message(*it, PS_SECONDARY, mu, _options.prepare_timeout_ms_for_secondaries);
    }

    count = 0;
    for (auto it = _primary_states.learners.begin(); it != _primary_states.learners.end(); it++)
    {
        if (it->second.prepare_start_decree != invalid_decree && mu->data.header.decree >= it->second.prepare_start_decree)
        {
            send_prepare_message(it->first, PS_POTENTIAL_SECONDARY, mu, _options.prepare_timeout_ms_for_potential_secondaries);
            count++;
        }
    }
    mu->set_left_potential_secondary_ack_count(count);

    // it is possible to do commit here when logging is not required for acking prepare.
    // however, it is only possible when replica count == 1 at this moment in the
    // replication group, and we don't want to do this as it is too fragile now.
    // do_possible_commit_on_primary(mu);

    // local log
    dassert (mu->data.header.log_offset == invalid_offset, "");
    dassert (mu->log_task() == nullptr, "");
    mu->log_task() = _stub->_log->append(mu,
                                         LPC_WRITE_REPLICATION_LOG,
                                         this,
                                         std::bind(&replica::on_append_log_completed, this, mu,
                                                 std::placeholders::_1,
                                                 std::placeholders::_2),
                                         gpid_to_hash(get_gpid())
                                        );

    dassert(nullptr != mu->log_task(), "");
    return;

ErrOut:
    response_client_message(mu->client_msg(), err);
    return;
}
コード例 #2
0
ファイル: replica_2pc.cpp プロジェクト: Jupige/rDSN
void replica::init_prepare(mutation_ptr& mu)
{
    dassert (PS_PRIMARY == status(), "");

    error_code err = ERR_OK;
    uint8_t count = 0;
            
    mu->data.header.last_committed_decree = last_committed_decree();
    if (mu->data.header.decree == invalid_decree)
    {
        mu->set_id(get_ballot(), _prepare_list->max_decree() + 1);
    }
    else
    {
        mu->set_id(get_ballot(), mu->data.header.decree);
    }
    
    dinfo("%s: mutation %s init_prepare, mutation_tid=%" PRIu64, name(), mu->name(), mu->tid());

    // check bounded staleness
    if (mu->data.header.decree > last_committed_decree() + _options->staleness_for_commit)
    {
        err = ERR_CAPACITY_EXCEEDED;
        goto ErrOut;
    }
 
    dassert (mu->data.header.decree > last_committed_decree(), "");

    // local prepare
    err = _prepare_list->prepare(mu, PS_PRIMARY);
    if (err != ERR_OK)
    {
        goto ErrOut;
    }
    
    // remote prepare
    mu->set_prepare_ts();
    mu->set_left_secondary_ack_count((unsigned int)_primary_states.membership.secondaries.size());
    for (auto it = _primary_states.membership.secondaries.begin(); it != _primary_states.membership.secondaries.end(); ++it)
    {
        send_prepare_message(*it, PS_SECONDARY, mu, _options->prepare_timeout_ms_for_secondaries);
    }

    count = 0;
    for (auto it = _primary_states.learners.begin(); it != _primary_states.learners.end(); ++it)
    {
        if (it->second.prepare_start_decree != invalid_decree && mu->data.header.decree >= it->second.prepare_start_decree)
        {
            send_prepare_message(it->first, PS_POTENTIAL_SECONDARY, mu, _options->prepare_timeout_ms_for_potential_secondaries, it->second.signature);
            count++;
        }
    }    
    mu->set_left_potential_secondary_ack_count(count);

    if (mu->is_logged())
    {
        do_possible_commit_on_primary(mu);
    }
    else
    {
        dassert(mu->data.header.log_offset == invalid_offset, "");
        dassert(mu->log_task() == nullptr, "");

        mu->log_task() = _stub->_log->append(mu,
            LPC_WRITE_REPLICATION_LOG,
            this,
            std::bind(&replica::on_append_log_completed, this, mu,
                      std::placeholders::_1,
                      std::placeholders::_2),
                      gpid_to_hash(get_gpid())
            );

        dassert(nullptr != mu->log_task(), "");
    }
    return;

ErrOut:
    for (auto& r : mu->client_requests)
    {
        response_client_message(r, err);
    }
    return;
}
コード例 #3
0
ファイル: replica_2pc.cpp プロジェクト: Abioy/rDSN
void replica::init_prepare(mutation_ptr& mu)
{
    dassert (PS_PRIMARY == status(), "");

    error_code err = ERR_SUCCESS;
    uint8_t count = 0;

    if (static_cast<int>(_primary_states.membership.secondaries.size()) + 1 < _options.mutation_2pc_min_replica_count)
    {
        err = ERR_NOT_ENOUGH_MEMBER;
        goto ErrOut;
    }
            
    mu->data.header.last_committed_decree = last_committed_decree();
    if (mu->data.header.decree == invalid_decree)
    {
        mu->set_id(get_ballot(), _prepare_list->max_decree() + 1);
    }
    else
    {
        mu->set_id(get_ballot(), mu->data.header.decree);
    }

    if (mu->data.header.decree > _prepare_list->max_decree() && _prepare_list->count() >= _options.staleness_for_commit)
    {
        err = ERR_CAPACITY_EXCEEDED;
        goto ErrOut;
    }
 
    dassert (mu->data.header.decree > last_committed_decree(), "");

    // local prepare without log
    err = _prepare_list->prepare(mu, PS_PRIMARY);
    if (err != ERR_SUCCESS)
    {
        goto ErrOut;
    }
        
    ddebug("%s: mutation %s init_prepare", name(), mu->name());

    //
    // TODO: bounded staleness on secondaries
    //
    dassert (mu->data.header.decree <= last_committed_decree() + _options.staleness_for_commit, "");
    
    // remote prepare
    dassert (mu->remote_tasks().size() == 0, "");
    mu->set_left_secondary_ack_count((unsigned int)_primary_states.membership.secondaries.size());
    for (auto it = _primary_states.membership.secondaries.begin(); it != _primary_states.membership.secondaries.end(); it++)
    {
        send_prepare_message(*it, PS_SECONDARY, mu, _options.prepare_timeout_ms_for_secondaries);
    }

    count = 0;
    for (auto it = _primary_states.learners.begin(); it != _primary_states.learners.end(); it++)
    {
        if (it->second.prepare_start_decree != invalid_decree && mu->data.header.decree >= it->second.prepare_start_decree)
        {
            send_prepare_message(it->first, PS_POTENTIAL_SECONDARY, mu, _options.prepare_timeout_ms_for_potential_secondaries);
            count++;
        }
    }    
    mu->set_left_potential_secondary_ack_count(count);

    // local log
    dassert (mu->data.header.log_offset == invalid_offset, "");
    dassert (mu->log_task() == nullptr, "");
    mu->log_task() = _stub->_log->append(mu,
        LPC_WRITE_REPLICATION_LOG,
        this,
        std::bind(&replica::on_append_log_completed, this, mu, 
            std::placeholders::_1, 
            std::placeholders::_2),
        gpid_to_hash(get_gpid())
        );

    if (nullptr == mu->log_task())
    {
        err = ERR_FILE_OPERATION_FAILED;
        handle_local_failure(err);
        goto ErrOut;
    }

    return;

ErrOut:
    response_client_message(mu->client_request, err);
    return;
}