109 lines
3.6 KiB
C++
109 lines
3.6 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#include "ob_log_handler_base.h"
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#include "common/ob_role.h"
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#include "logservice/palf/log_define.h"
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namespace oceanbase
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{
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namespace logservice
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{
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ObLogHandlerBase::ObLogHandlerBase() :
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lock_(),
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role_(common::FOLLOWER),
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proposal_id_(palf::INVALID_PROPOSAL_ID),
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id_(-1),
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palf_handle_(),
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palf_env_(NULL),
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is_in_stop_state_(true),
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is_inited_(false)
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{}
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int ObLogHandlerBase::prepare_switch_role(common::ObRole &curr_role,
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int64_t &curr_proposal_id,
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common::ObRole &new_role,
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int64_t &new_proposal_id,
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bool &is_pending_state) const
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{
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int ret = OB_SUCCESS;
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RLockGuard guard(lock_);
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if (OB_FAIL(palf_handle_.get_role(new_role, new_proposal_id, is_pending_state))) {
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PALF_LOG(WARN, "PalfHandle get_role failed", K(ret), K_(id), K(curr_role), K(curr_proposal_id));
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} else {
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curr_role = role_;
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curr_proposal_id = proposal_id_;
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PALF_LOG(TRACE, "prepare_switch_role success", K(ret), K_(id), K(curr_role), K(curr_proposal_id),
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K(new_role), K(new_proposal_id));
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}
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return ret;
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}
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int ObLogHandlerBase::advance_election_epoch_and_downgrade_priority(const int64_t downgrade_priority_time_us,
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const char *reason)
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{
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RLockGuard guard(lock_);
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return palf_handle_.advance_election_epoch_and_downgrade_priority(proposal_id_, downgrade_priority_time_us, reason);
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}
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int ObLogHandlerBase::change_leader_to(const common::ObAddr &dst_addr)
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{
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int ret = OB_SUCCESS;
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RLockGuard guard(lock_);
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if (OB_FAIL(palf_handle_.change_leader_to(dst_addr))) {
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PALF_LOG(WARN, "palf change_leader failed", K(ret), K(dst_addr), K(palf_handle_));
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} else {
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PALF_LOG(INFO, "ObLogHandler change_laeder success", K(ret), K(dst_addr), K(palf_handle_));
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}
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return ret;
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}
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int ObLogHandlerBase::get_role(common::ObRole &role, int64_t &proposal_id) const
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{
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int ret = OB_SUCCESS;
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bool is_pending_state = false;
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int64_t curr_palf_proposal_id;
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ObRole curr_palf_role;
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// 获取当前的proposal_id
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RLockGuard guard(lock_);
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const int64_t saved_proposal_id = ATOMIC_LOAD(&proposal_id_);
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const ObRole saved_role = ATOMIC_LOAD(&role_);
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if (IS_NOT_INIT) {
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ret = OB_NOT_INIT;
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} else if (is_in_stop_state_) {
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ret = OB_NOT_RUNNING;
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} else if (FOLLOWER == saved_role) {
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role = FOLLOWER;
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proposal_id = saved_proposal_id;
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} else if (OB_FAIL(palf_handle_.get_role(curr_palf_role, curr_palf_proposal_id, is_pending_state))) {
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CLOG_LOG(WARN, "get_role failed", K(ret));
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} else if (curr_palf_proposal_id != saved_proposal_id) {
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// palf的proposal_id已经发生变化，返回FOLLOWER
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role = FOLLOWER;
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proposal_id = saved_proposal_id;
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} else {
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role = curr_palf_role;
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proposal_id = saved_proposal_id;
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}
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return ret;
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}
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// Note: do not acquire any lock in the function
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int ObLogHandlerBase::get_role_atomically(common::ObRole &role) const
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{
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int ret = OB_SUCCESS;
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role = ATOMIC_LOAD(&role_);
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return ret;
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}
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} // end namespace logservice
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} // end namespace oceanbase
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