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2021-05-31 22:56:52 +08:00
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src/sql/session/ob_sql_session_mgr.cpp Normal file
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/**
* Copyright (c) 2021 OceanBase
* OceanBase CE is licensed under Mulan PubL v2.
* You can use this software according to the terms and conditions of the Mulan PubL v2.
* You may obtain a copy of Mulan PubL v2 at:
* http://license.coscl.org.cn/MulanPubL-2.0
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
* See the Mulan PubL v2 for more details.
*/
#define USING_LOG_PREFIX SQL
#include "sql/session/ob_sql_session_mgr.h"
#include "lib/string/ob_sql_string.h"
#include "lib/stat/ob_session_stat.h"
#include "lib/mysqlclient/ob_mysql_proxy.h"
#include "share/inner_table/ob_inner_table_schema_constants.h"
#include "io/easy_io.h"
#include "rpc/ob_rpc_define.h"
#include "sql/ob_sql_trans_control.h"
#include "observer/mysql/obsm_handler.h"
#include "observer/mysql/obsm_struct.h"
#include "observer/ob_server_struct.h"
using namespace oceanbase::common;
using namespace oceanbase::sql;
using namespace oceanbase::share;
using namespace oceanbase::observer;
ObSQLSessionMgr::SessionPool::SessionPool() : session_pool_()
{
MEMSET(session_array, 0, POOL_CAPACIPY * sizeof(ObSQLSessionInfo*));
}
int ObSQLSessionMgr::SessionPool::init()
{
int ret = OB_SUCCESS;
char* session_buf = reinterpret_cast<char*>(session_array);
OZ(session_pool_.init(POOL_CAPACIPY, session_buf));
return ret;
}
int ObSQLSessionMgr::SessionPool::pop_session(uint64_t tenant_id, ObSQLSessionInfo*& session)
{
int ret = OB_SUCCESS;
session = NULL;
if (OB_FAIL(session_pool_.pop(session))) {
if (ret != OB_ENTRY_NOT_EXIST) {
LOG_WARN(
"failed to pop session", K(ret), K(tenant_id), K(session_pool_.get_total()), K(session_pool_.get_free()));
} else {
ret = OB_SUCCESS;
LOG_INFO(
"session pool is empty", K(tenant_id), K(session_pool_.get_total()), K(session_pool_.get_free()), K(lbt()));
}
}
return ret;
}
int ObSQLSessionMgr::SessionPool::push_session(uint64_t tenant_id, ObSQLSessionInfo*& session)
{
int ret = OB_SUCCESS;
if (OB_NOT_NULL(session)) {
if (OB_FAIL(session_pool_.push(session))) {
if (ret != OB_SIZE_OVERFLOW) {
LOG_WARN(
"failed to push session", K(ret), K(tenant_id), K(session_pool_.get_total()), K(session_pool_.get_free()));
} else {
ret = OB_SUCCESS;
LOG_INFO(
"session pool is full", K(tenant_id), K(session_pool_.get_total()), K(session_pool_.get_free()), K(lbt()));
}
} else {
session = NULL;
}
}
return ret;
}
int64_t ObSQLSessionMgr::SessionPool::count() const
{
return session_pool_.get_total();
}
int ObSQLSessionMgr::SessionPoolMap::get_session_pool(uint64_t tenant_id, SessionPool*& session_pool)
{
int ret = OB_SUCCESS;
uint64_t block_id = get_block_id(tenant_id);
uint64_t slot_id = get_slot_id(tenant_id);
SessionPoolBlock* pool_block = NULL;
if (block_id < pool_blocks_.count()) {
OX(pool_block = pool_blocks_.at(block_id));
} else {
OZ(create_pool_block(block_id, pool_block));
}
OV(OB_NOT_NULL(pool_block), OB_ERR_UNEXPECTED, tenant_id, block_id, slot_id);
OX(session_pool = ATOMIC_LOAD(&((*pool_block)[slot_id])));
if (OB_ISNULL(session_pool)) {
OZ(create_session_pool(*pool_block, slot_id, session_pool));
}
return ret;
}
int ObSQLSessionMgr::SessionPoolMap::create_pool_block(uint64_t block_id, SessionPoolBlock*& pool_block)
{
int ret = OB_SUCCESS;
void* buf = NULL;
ObLockGuard<ObSpinLock> lock_guard(lock_);
while (OB_SUCC(ret) && block_id >= pool_blocks_.count()) {
OV(OB_NOT_NULL(buf = alloc_.alloc(sizeof(SessionPoolBlock))), OB_ALLOCATE_MEMORY_FAILED, block_id);
OX(MEMSET(buf, 0, sizeof(SessionPoolBlock)));
OZ(pool_blocks_.push_back(static_cast<SessionPoolBlock*>(buf)), block_id);
}
OX(pool_block = pool_blocks_.at(block_id));
return ret;
}
int ObSQLSessionMgr::SessionPoolMap::create_session_pool(
SessionPoolBlock& pool_block, uint64_t slot_id, SessionPool*& session_pool)
{
int ret = OB_SUCCESS;
void* buf = NULL;
OV(slot_id < SLOT_PER_BLOCK);
ObLockGuard<ObSpinLock> lock_guard(lock_);
if (OB_ISNULL(session_pool = ATOMIC_LOAD(&(pool_block[slot_id])))) {
OV(OB_NOT_NULL(buf = alloc_.alloc(sizeof(SessionPool))), OB_ALLOCATE_MEMORY_FAILED);
OV(OB_NOT_NULL(session_pool = new (buf) SessionPool()));
OZ(session_pool->init());
OX(ATOMIC_STORE(&(pool_block[slot_id]), session_pool));
}
return ret;
}
uint64_t ObSQLSessionMgr::SessionPoolMap::get_block_id(uint64_t tenant_id) const
{
return tenant_id >> BLOCK_ID_SHIFT;
}
uint64_t ObSQLSessionMgr::SessionPoolMap::get_slot_id(uint64_t tenant_id) const
{
return tenant_id & SLOT_ID_MASK;
}
int ObSQLSessionMgr::ValueAlloc::clean_tenant(uint64_t tenant_id)
{
int ret = OB_SUCCESS;
SessionPool* session_pool = NULL;
ObSQLSessionInfo* session = NULL;
if (is_valid_tenant_id(tenant_id)) {
OX(session_pool_map_.get_session_pool(tenant_id, session_pool));
}
if (OB_NOT_NULL(session_pool)) {
// Note that there is no design guarantee that the session pool must be completely cleaned.
// There is a very low probability of session leak.
// 1. In the production system, deleting tenants is a very rare operation.
// 2. In the production system, before deleting a tenant, we must ensure that the business
// layer will no longer access the tenant.
// Under the above premise, theoretically, the tenant will have no active session.
// 3. When stopping an observer, even if a few sessions are missing, they will be releasedi
// with the end of the process.
// 4. In the case of unit migration, a few sessions may not be released, but in the future,
// the unit can be reused after migrating back.
while (session_pool->count() > 0) {
OX(session_pool->pop_session(tenant_id, session));
if (OB_NOT_NULL(session)) {
OX(op_reclaim_free(session));
OX(session = NULL);
}
}
}
return ret;
}
ObSQLSessionInfo* ObSQLSessionMgr::ValueAlloc::alloc_value(uint64_t tenant_id)
{
int ret = OB_SUCCESS;
SessionPool* session_pool = NULL;
ObSQLSessionInfo* session = NULL;
int64_t alloc_total_count = 0;
// we use OX instead of OZ in operation of upper session pool, because we need acquire
// from lower session pool when not success, no matter which errno we get here.
if (is_valid_tenant_id(tenant_id)) {
OX(session_pool_map_.get_session_pool(tenant_id, session_pool));
OX(alloc_total_count = ATOMIC_FAA(&alloc_total_count_, 1));
}
if (OB_NOT_NULL(session_pool)) {
OX(session_pool->pop_session(tenant_id, session));
}
if (OB_ISNULL(session)) {
OX(session = op_reclaim_alloc(ObSQLSessionInfo));
} else {
OX(ATOMIC_FAA(&alloc_from_pool_count_, 1));
}
OV(OB_NOT_NULL(session));
OX(session->set_valid(true));
OX(session->set_shadow(true));
if (alloc_total_count > 0 && alloc_total_count % 10000 == 0) {
LOG_INFO("alloc_session_count", K(alloc_total_count), K_(alloc_from_pool_count));
}
return session;
}
void ObSQLSessionMgr::ValueAlloc::free_value(ObSQLSessionInfo* session)
{
if (OB_NOT_NULL(session)) {
int ret = OB_SUCCESS;
uint64_t tenant_id = session->get_login_tenant_id();
SessionPool* session_pool = NULL;
int64_t free_total_count = 0;
if (is_valid_tenant_id(tenant_id) && session->can_release_to_pool()) {
if (session->is_use_inner_allocator() && !session->is_tenant_killed()) {
OX(session_pool_map_.get_session_pool(tenant_id, session_pool));
}
OX(free_total_count = ATOMIC_FAA(&free_total_count_, 1));
}
if (OB_NOT_NULL(session_pool)) {
OX(session->destroy(true));
OX(session->set_acquire_from_pool(true));
OX(session_pool->push_session(tenant_id, session));
}
if (OB_NOT_NULL(session)) {
OX(op_reclaim_free(session));
OX(session = NULL);
} else {
OX(ATOMIC_FAA(&free_to_pool_count_, 1));
}
if (free_total_count > 0 && free_total_count % 10000 == 0) {
LOG_INFO("free_session_count", K(free_total_count), K_(free_to_pool_count));
}
}
}
bool ObSQLSessionMgr::ValueAlloc::is_valid_tenant_id(uint64_t tenant_id) const
{
return ::is_valid_tenant_id(tenant_id) && tenant_id != OB_INVALID_ID && tenant_id != OB_SYS_TENANT_ID;
}
int ObSQLSessionMgr::init()
{
int ret = OB_SUCCESS;
if (OB_FAIL(sessinfo_map_.init())) {
LOG_WARN("fail to init session map", K(ret));
} else if (OB_FAIL(sessid_sequence_.init(MAX_LOCAL_SEQ))) {
LOG_WARN("init sessid sequence failed", K(ret));
}
for (uint32_t i = 1; OB_SUCC(ret) && i <= MAX_LOCAL_SEQ; ++i) {
if (OB_FAIL(sessid_sequence_.push(reinterpret_cast<void*>(i)))) {
LOG_WARN("store sessid sequence failed", K(ret), K(i));
}
}
return ret;
}
uint64_t ObSQLSessionMgr::extract_server_id(uint32_t sessid)
{
uint64_t server_id = sessid >> LOCAL_SEQ_LEN;
return server_id & MAX_SERVER_ID;
}
int ObSQLSessionMgr::inc_session_ref(const ObSQLSessionInfo* my_session)
{
int ret = OB_SUCCESS;
if (OB_NOT_NULL(my_session)) {
ObSQLSessionInfo* tmp_session = NULL;
uint32_t version = my_session->get_version();
uint32_t sessid = my_session->get_sessid();
if (OB_FAIL(get_session(version, sessid, tmp_session))) {
LOG_WARN("fail to get session", K(version), K(sessid), K(ret));
}
UNUSED(tmp_session);
}
return ret;
}
// |<---------------------------------32bit---------------------------->|
// 0b 1b 15b 16b
// +----+------------------------------+--------------------------------+
// |Mask| Server Id | Local Seq |
// +----+------------------------------+--------------------------------+
//
// MASK: 1 means session_id is generated by observer, 0 means by proxy.
// Server Id: generated by root server, and unique in cluster.
// Local Seq: max session number in an observer.
//
int ObSQLSessionMgr::create_sessid(uint32_t& sessid)
{
int ret = OB_SUCCESS;
int tmp_ret = OB_SUCCESS;
sessid = 0;
const uint64_t server_id = GCTX.server_id_;
uint32_t local_seq = 0;
static uint32_t abnormal_seq = 0;
if (server_id > MAX_SERVER_ID) {
ret = OB_ERR_UNEXPECTED;
LOG_ERROR("server id maybe invalid", K(ret), K(server_id));
} else if (0 == server_id) {
local_seq = (ATOMIC_FAA(&abnormal_seq, 1) & MAX_LOCAL_SEQ);
uint32_t max_local_seq = MAX_LOCAL_SEQ;
uint32_t max_server_id = MAX_SERVER_ID;
LOG_WARN("server is initiating", K(server_id), K(local_seq), K(max_local_seq), K(max_server_id));
} else if (OB_UNLIKELY(OB_SUCCESS != (ret = tmp_ret = get_avaiable_local_seq(local_seq)))) {
LOG_WARN("fail to get avaiable local_seq", K(local_seq));
} else { /*do nothing*/
}
if (OB_SUCC(ret)) {
sessid = local_seq | SERVER_SESSID_TAG; // set observer sessid mark
sessid |= static_cast<uint32_t>(server_id << LOCAL_SEQ_LEN); // set observer
// high bit is reserved for server id
sessid |= static_cast<uint32_t>(1ULL << (LOCAL_SEQ_LEN + SERVER_ID_LEN));
}
return ret;
}
// if ret == OB_SUCCESS, sess_info must be not NULL, caller must call revert_session() later.
// if ret != OB_SUCCESS, sess_info must be NULL.
int ObSQLSessionMgr::create_session_by_version(
uint64_t tenant_id, uint32_t sessid, uint64_t proxy_sessid, ObSQLSessionInfo*& sess_info, uint32_t& out_version)
{
int ret = OB_SUCCESS;
int gt_ret = OB_SUCCESS;
int rt_ret = OB_SUCCESS;
sess_info = NULL;
out_version = 0;
uint32_t version = 0;
bool is_shadow = false;
ObSQLSessionInfo* tmp_sess = NULL;
do {
is_shadow = false;
if (OB_FAIL(sessinfo_map_.create(tenant_id, Key(version, sessid, proxy_sessid), tmp_sess))) {
if (OB_LIKELY(OB_ENTRY_EXIST == ret)) {
if (OB_UNLIKELY(OB_SUCCESS != (gt_ret = get_session(version, sessid, tmp_sess)))) {
if (OB_ENTRY_NOT_EXIST == gt_ret) {
LOG_DEBUG("session has been freed", K(gt_ret), K(version), K(sessid));
} else {
LOG_WARN("fail to get session", K(gt_ret), K(version), K(sessid));
}
} else {
is_shadow = tmp_sess->is_shadow();
if (OB_UNLIKELY(OB_SUCCESS != (rt_ret = revert_session(tmp_sess)))) {
LOG_ERROR("fail to revert session", K(rt_ret));
}
++version;
}
}
}
} while (OB_UNLIKELY(OB_ENTRY_EXIST == ret && ((OB_SUCCESS == gt_ret && is_shadow) || OB_ENTRY_NOT_EXIST == gt_ret) &&
version <= MAX_VERSION));
if (OB_SUCC(ret)) {
sess_info = tmp_sess;
out_version = version;
}
return ret;
}
// if ret == OB_SUCCESS, sess_info must be not NULL, caller must call revert_session() later.
// if ret != OB_SUCCESS, sess_info must be NULL.
int ObSQLSessionMgr::create_session(ObSMConnection* conn, ObSQLSessionInfo*& sess_info)
{
int ret = OB_SUCCESS;
sess_info = NULL;
if (OB_ISNULL(conn)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("conn is NULL", K(ret));
} else if (OB_FAIL(create_session(
conn->tenant_id_, conn->sessid_, conn->proxy_sessid_, conn->sess_create_time_, sess_info))) {
LOG_WARN("create session failed", K(ret));
} else if (OB_ISNULL(sess_info)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("NULL session returned", K(ret));
} else {
conn->version_ = sess_info->get_version();
}
return ret;
}
int ObSQLSessionMgr::create_session(const uint64_t tenant_id, const uint32_t sessid, const uint64_t proxy_sessid,
const int64_t create_time, ObSQLSessionInfo*& session_info)
{
int ret = OB_SUCCESS;
int err = OB_SUCCESS;
session_info = NULL;
uint32_t version = 0;
ObSQLSessionInfo* tmp_sess = NULL;
if (OB_FAIL(create_session_by_version(tenant_id, sessid, proxy_sessid, tmp_sess, version))) {
LOG_WARN("fail to create session by version", K(ret), K(sessid), K(version));
if (OB_ENTRY_EXIST == ret) {
ret = OB_SESSION_ENTRY_EXIST;
}
} else if (OB_ISNULL(tmp_sess)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("fail to alloc session info", K(ret), K(version), K(sessid), K(proxy_sessid));
} else if (OB_FAIL(tmp_sess->init(version, sessid, proxy_sessid, NULL, NULL, create_time, tenant_id))) {
LOG_WARN("fail to init session", K(ret), K(tmp_sess), K(version), K(sessid), K(proxy_sessid), K(create_time));
if (OB_SUCCESS != (err = revert_session(tmp_sess))) {
LOG_ERROR("fail to free session", K(err), K(version), K(sessid), K(proxy_sessid));
} else if (OB_SUCCESS != (err = sessinfo_map_.del(Key(version, sessid)))) {
LOG_ERROR("fail to free session", K(err), K(version), K(sessid), K(proxy_sessid));
} else {
LOG_DEBUG("free session successfully in create session", K(err), K(version), K(sessid), K(proxy_sessid));
}
} else {
tmp_sess->update_last_active_time();
session_info = tmp_sess;
}
return ret;
}
int ObSQLSessionMgr::free_session(const ObFreeSessionCtx& ctx)
{
int ret = OB_SUCCESS;
uint32_t version = ctx.version_;
uint32_t sessid = ctx.sessid_;
uint64_t proxy_sessid = ctx.proxy_sessid_;
uint64_t tenant_id = ctx.tenant_id_;
bool has_inc = ctx.has_inc_active_num_;
ObSQLSessionInfo* sess_info = NULL;
sessinfo_map_.get(Key(version, sessid), sess_info);
if (NULL != sess_info) {
sessinfo_map_.revert(sess_info);
}
if (OB_FAIL(sessinfo_map_.del(Key(version, sessid)))) {
LOG_WARN("fail to remove session from session map", K(ret), K(version), K(sessid), K(proxy_sessid));
} else if (tenant_id != 0 && sessid != 0 && has_inc) {
ObTenantStatEstGuard guard(tenant_id);
EVENT_DEC(ACTIVE_SESSIONS);
}
return ret;
}
void ObSQLSessionMgr::try_check_session()
{
int ret = OB_SUCCESS;
int64_t sess_count = 0;
CheckSessionFunctor check_timeout(this);
if (OB_FAIL(for_each_session(check_timeout))) {
LOG_WARN("fail to check time out", K(ret));
} else if (OB_FAIL(get_session_count(sess_count))) {
LOG_WARN("fail to get session count", K(ret));
} else {
LOG_DEBUG("get current session count", K(sess_count));
}
}
void ObSQLSessionMgr::runTimerTask()
{
try_check_session();
}
// just a wrapper
int ObSQLSessionMgr::kill_query(ObSQLSessionInfo& session)
{
return kill_query(session, partition_service_);
}
int ObSQLSessionMgr::kill_query(ObSQLSessionInfo& session, storage::ObPartitionService* partition_service)
{
int tmp_ret = OB_SUCCESS;
// must call kill_query_session() to wakeup worker thread first,
// otherwise kill_query() may not work if worker is sleep.
if (OB_SUCCESS !=
(tmp_ret = ObSqlTransControl::kill_query_session(partition_service, session, ObSQLSessionState::QUERY_KILLED))) {
LOG_WARN("fail to kill query or session", "ret", tmp_ret, K(session));
}
return session.kill_query();
}
// kill active transaction on this session
int ObSQLSessionMgr::kill_active_trx(ObSQLSessionInfo* session)
{
return ObSqlTransControl::kill_active_trx(partition_service_, session);
}
int ObSQLSessionMgr::kill_session(ObSQLSessionInfo& session)
{
int ret = OB_SUCCESS;
int tmp_ret = OB_SUCCESS;
// must call kill_query_session() to wakeup worker thread first,
// otherwise kill_query() may not work if worker is sleep.
if (OB_SUCCESS != (tmp_ret = ObSqlTransControl::kill_query_session(
partition_service_, session, ObSQLSessionState::SESSION_KILLED))) {
LOG_WARN("fail to kill query or session", "ret", tmp_ret, K(session));
}
session.set_session_state(SESSION_KILLED);
// DO NOT change the order of the two guards below, otherwise it may cause deadlock.
ObSQLSessionInfo::LockGuard query_lock_guard(session.get_query_lock());
ObSQLSessionInfo::LockGuard data_lock_guard(session.get_thread_data_lock());
bool has_called_txs_end_trans = false;
session.set_query_start_time(ObTimeUtility::current_time());
if (OB_SUCCESS != (tmp_ret = ObSqlTransControl::end_trans(partition_service_, &session, has_called_txs_end_trans))) {
LOG_WARN("fail to rollback transaction",
K(session.get_sessid()),
"proxy_sessid",
session.get_proxy_sessid(),
K(tmp_ret),
"trans_id",
session.get_trans_desc().get_trans_id(),
"query_str",
session.get_current_query_string(),
K(has_called_txs_end_trans));
}
session.update_last_active_time();
easy_connection_t* c = session.get_conn();
if (OB_LIKELY(NULL != c)) {
// this function will trigger on_close(), and then free the session
easy_connection_destroy_dispatch(c);
session.set_conn(NULL); // the connection is invalid now
LOG_INFO("kill session successfully",
"proxy",
session.get_proxy_addr(),
"peer",
session.get_peer_addr(),
"real_client_ip",
session.get_client_ip(),
"sessid",
session.get_sessid(),
"proxy_sessid",
session.get_proxy_sessid(),
"trans_id",
session.get_trans_desc().get_trans_id(),
"is_trans_end",
session.get_trans_desc().is_trans_end(),
"query_str",
session.get_current_query_string());
} else {
LOG_WARN("get conn from session info is null",
K(session.get_sessid()),
K(session.get_version()),
"proxy_sessid",
session.get_proxy_sessid(),
K(session.get_magic_num()));
}
return ret;
}
int ObSQLSessionMgr::disconnect_session(ObSQLSessionInfo& session)
{
int ret = OB_SUCCESS;
// DO NOT change the order of the two guards below, otherwise it may cause deadlock.
ObSQLSessionInfo::LockGuard query_lock_guard(session.get_query_lock());
ObSQLSessionInfo::LockGuard data_lock_guard(session.get_thread_data_lock());
bool has_called_txs_end_trans = false;
session.set_query_start_time(ObTimeUtility::current_time());
if (OB_FAIL(ObSqlTransControl::end_trans(partition_service_, &session, has_called_txs_end_trans))) {
LOG_WARN("fail to rollback transaction",
K(session.get_sessid()),
"proxy_sessid",
session.get_proxy_sessid(),
K(ret),
"trans_id",
session.get_trans_desc().get_trans_id(),
"query_str",
session.get_current_query_string(),
K(has_called_txs_end_trans));
}
session.update_last_active_time();
return ret;
}
int ObSQLSessionMgr::kill_tenant(const uint64_t tenant_id)
{
int ret = OB_SUCCESS;
KillTenant kt_func(this, tenant_id);
OZ(for_each_session(kt_func));
OZ(sessinfo_map_.clean_tenant(tenant_id));
return ret;
}
int ObSQLSessionMgr::mark_sessid_used(uint32_t sess_id)
{
UNUSED(sess_id);
return OB_NOT_SUPPORTED;
}
int ObSQLSessionMgr::mark_sessid_unused(uint32_t sess_id)
{
int ret = OB_SUCCESS;
uint64_t server_id = extract_server_id(sess_id);
if (server_id == 0) {
// see create_sessid(), sess_id with server_id 0 is not allocated from sessid_sequence_.
} else if (OB_FAIL(sessid_sequence_.push(reinterpret_cast<void*>(sess_id & MAX_LOCAL_SEQ)))) {
LOG_WARN("fail to push sessid to sessid_sequence_", K(sess_id), K(ret));
}
return ret;
}
bool ObSQLSessionMgr::CheckSessionFunctor::operator()(sql::ObSQLSessionMgr::Key key, ObSQLSessionInfo* sess_info)
{
int ret = OB_SUCCESS;
UNUSED(key);
bool is_timeout = false;
if (OB_ISNULL(sess_info)) {
ret = OB_NOT_INIT;
LOG_WARN("session info is NULL");
} else if (false == sess_info->is_valid()) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("session info is not valid", K(ret));
} else {
// DO NOT change the order of the two locks below, otherwise it may cause deadlock.
if (OB_FAIL(sess_info->try_lock_query())) {
if (OB_UNLIKELY(OB_EAGAIN != ret)) {
LOG_WARN("fail to try lock query", K(ret));
} else {
ret = OB_SUCCESS;
}
} else {
if (OB_FAIL(sess_info->try_lock_thread_data())) {
if (OB_UNLIKELY(OB_EAGAIN != ret)) {
LOG_WARN("fail to try lock thread data", K(ret));
} else {
ret = OB_SUCCESS;
}
} else {
if (OB_ISNULL(sess_mgr_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("session manager point is NULL");
} else if (OB_FAIL(sess_info->is_timeout(is_timeout))) {
LOG_WARN("fail to check is timeout", K(ret));
} else if (true == is_timeout) {
LOG_INFO("session is timeout, kill this session", K(key.version_), K(key.sessid_));
ret = sess_mgr_->kill_session(*sess_info);
} else {
sess_info->get_cached_schema_guard_info().try_revert_schema_guard();
// kill transaction which is idle more than configuration 'ob_trx_idle_timeout'
if (OB_FAIL(sess_info->is_trx_idle_timeout(is_timeout))) {
LOG_WARN("fail to check transaction idle timeout", K(ret));
} else if (true == is_timeout) {
LOG_INFO("transaction is idle timeout, start to rollback", K(key.version_), K(key.sessid_));
int tmp_ret;
if (OB_SUCCESS != (tmp_ret = sess_mgr_->kill_active_trx(sess_info))) {
LOG_WARN("fail to kill transaction", K(tmp_ret), K(key.version_), K(key.sessid_));
}
}
}
(void)sess_info->unlock_thread_data();
}
(void)sess_info->unlock_query();
}
}
return OB_SUCCESS == ret;
}
bool ObSQLSessionMgr::KillTenant::operator()(sql::ObSQLSessionMgr::Key, ObSQLSessionInfo* sess_info)
{
int ret = OB_SUCCESS;
if (OB_ISNULL(mgr_)) {
ret = OB_NOT_INIT;
LOG_WARN("session mgr_ is NULL", K(mgr_));
} else if (OB_ISNULL(sess_info)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("sess info is NULL", K(sess_info));
} else {
if (sess_info->get_priv_tenant_id() == tenant_id_) {
ret = mgr_->kill_session(*sess_info);
}
}
return OB_SUCCESS == ret;
}
int ObSQLSessionMgr::get_avaiable_local_seq(uint32_t& local_seq)
{
int ret = OB_SUCCESS;
local_seq = 0;
void* ptr = nullptr;
if (OB_FAIL(sessid_sequence_.pop(ptr))) {
LOG_WARN("fail to find and set first zero bit", K(ret));
} else {
int64_t value = reinterpret_cast<int64_t>(ptr);
if (value > MAX_LOCAL_SEQ) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected value from bitset", K(ret), K(value), K(ptr));
} else {
local_seq = static_cast<uint32_t>(value);
}
}
if (OB_ENTRY_NOT_EXIST == ret) {
ret = OB_ERR_CON_COUNT_ERROR;
int64_t sess_count = 0;
(void)get_session_count(sess_count);
LOG_WARN("too many connection", "connection_count", sess_count, K(ret));
}
return ret;
}
int ObSQLSessionMgr::is_need_clear_sessid(const ObSMConnection* conn, bool& is_need)
{
int ret = OB_SUCCESS;
is_need = false;
if (OB_ISNULL(conn)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected parameter", K(conn));
} else if (is_server_sessid(conn->sessid_) && ObSMConnection::INITIAL_SESSID != conn->sessid_ &&
0 != extract_server_id(conn->sessid_) && GCTX.server_id_ == extract_server_id(conn->sessid_) &&
conn->is_need_clear_sessid_) {
is_need = true;
} else { /*do nothing*/
}
return ret;
}