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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_DAS
#include "ob_das_task_result.h"
#include "observer/ob_server_struct.h"
#include "observer/omt/ob_multi_tenant.h"
#include "sql/das/ob_das_define.h"
#include "sql/das/ob_data_access_service.h"
#include "sql/engine/basic/ob_chunk_datum_store.h"
namespace oceanbase
{
using namespace common;
using namespace share;
namespace sql
{
ObDASTCB::ObDASTCB()
: task_id_(0),
expire_ts_(0),
packet_cnt_(0),
is_reading_(false),
is_exiting_(false),
is_vectorized_(false),
read_rows_(0),
max_batch_size_(0),
stored_row_(NULL),
stored_row_arr_(NULL),
datum_store_("DASTaskResMgr"),
result_iter_(),
tcb_lock_()
{
}
int ObDASTCB::register_reading()
{
int ret = OB_SUCCESS;
ObSpinLockGuard guard(tcb_lock_);
if (OB_FAIL(guard.get_ret())) {
LOG_WARN("acquire tcb lock failed", KR(ret), K(task_id_));
} else if (OB_UNLIKELY(is_exiting_)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("das tcb is exiting", KR(ret), K(task_id_));
} else if (OB_UNLIKELY(is_reading_)) {
ret = OB_EAGAIN;
LOG_TRACE("someone else is reading tcb, try again later", KR(ret), K(task_id_));
} else {
is_reading_ = true;
}
return ret;
}
int ObDASTCB::unregister_reading()
{
int ret = OB_SUCCESS;
ObSpinLockGuard guard(tcb_lock_);
if (OB_FAIL(guard.get_ret())) {
LOG_WARN("acquire tcb lock failed", KR(ret), K(task_id_));
} else if (OB_UNLIKELY(is_exiting_)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("das tcb is exiting", KR(ret), K(task_id_));
} else if (OB_UNLIKELY(!is_reading_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("tcb is not reading", KR(ret), K(task_id_));
} else {
is_reading_ = false;
}
return ret;
}
int ObDASTCB::register_exiting(bool &is_already_exiting)
{
int ret = OB_SUCCESS;
ObSpinLockGuard guard(tcb_lock_);
if (OB_FAIL(guard.get_ret())) {
LOG_WARN("acquire tcb lock failed", KR(ret), K(task_id_));
} else if (OB_UNLIKELY(is_reading_)) {
ret = OB_EAGAIN;
LOG_TRACE("someone else is reading tcb, try again later", KR(ret), K(task_id_));
} else if (OB_UNLIKELY(is_exiting_)) {
is_already_exiting = true;
} else {
is_exiting_ = true;
is_already_exiting = false;
}
return ret;
}
ObDASTaskResultMgr::ObDASTaskResultMgr()
: tcb_map_(),
gc_()
{
}
ObDASTaskResultMgr::~ObDASTaskResultMgr()
{
tcb_map_.~DASTCBMap();
gc_.~ObDASTaskResultGC();
}
int ObDASTaskResultMgr::init()
{
int ret = OB_SUCCESS;
if (OB_FAIL(tcb_map_.init())) {
LOG_WARN("init tcb map failed", KR(ret));
} else {
gc_.task_result_mgr_ = this;
}
return ret;
}
int ObDASTaskResultMgr::save_task_result(int64_t task_id,
const ExprFixedArray *output_exprs,
ObEvalCtx *eval_ctx,
common::ObNewRowIterator &result,
int64_t read_rows,
const ObDASScanCtDef *scan_ctdef,
const ObDASScanRtDef * scan_rtdef,
ObDASScanOp & scan_op)
{
int ret = OB_SUCCESS;
DASTCBInfo tcb_info(task_id);
ObDASTCB *tcb = NULL;
if (OB_ISNULL(output_exprs) || OB_ISNULL(eval_ctx) ||
OB_ISNULL(scan_ctdef) || OB_ISNULL(scan_rtdef)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument", KR(ret), KP(output_exprs), KP(eval_ctx),
KP(scan_ctdef), KP(scan_rtdef));
} else if (OB_FAIL(tcb_map_.contains_key(tcb_info))) {
if (OB_ENTRY_EXIST == ret) {
LOG_WARN("das task id already exist", KR(ret), K(task_id));
} else if (OB_ENTRY_NOT_EXIST != ret) {
LOG_WARN("check contains key failed", KR(ret), K(task_id));
} else {
ret = OB_SUCCESS;
int64_t expire_ts = scan_rtdef->timeout_ts_;
int64_t max_batch_size = scan_ctdef->pd_expr_spec_.max_batch_size_;
bool is_vectorized = scan_rtdef->p_pd_expr_op_->is_vectorized();
if (OB_ISNULL(tcb = op_alloc(ObDASTCB))) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("alloc das tcb failed", KR(ret));
} else {
tcb->task_id_ = task_id;
tcb->expire_ts_ = expire_ts;
tcb->packet_cnt_ = 0;
tcb->is_reading_ = false;
tcb->is_exiting_ = false;
tcb->is_vectorized_ = is_vectorized;
tcb->read_rows_ = 0;
tcb->stored_row_ = NULL;
tcb->stored_row_arr_ = NULL;
tcb->max_batch_size_ = max_batch_size;
ObChunkDatumStore &datum_store = tcb->datum_store_;
bool iter_end = false;
bool added = false;
if (is_vectorized) {
void *buf = NULL;
if (OB_ISNULL(buf = ob_malloc(sizeof(ObChunkDatumStore::StoredRow *) * max_batch_size, "DASTaskResMgr"))) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("alloc stored row array failed", KR(ret));
} else {
tcb->stored_row_arr_ = static_cast<const ObChunkDatumStore::StoredRow **>(buf);
}
}
if (OB_FAIL(ret)) {
// do nothing
} else if (OB_FAIL(datum_store.init(4 * 1024 * 1024, // 4MB
MTL_ID(),
common::ObCtxIds::DEFAULT_CTX_ID,
"DASTaskResMgr",
true))) {
LOG_WARN("init datum store failed", KR(ret));
} else if (OB_FAIL(datum_store.alloc_dir_id())) {
LOG_WARN("datum store alloc dir id failed", KR(ret));
}
// add rows already read but not added to datum_store
if (OB_FAIL(ret) || 0 == read_rows) {
// do nothing
} else if (!is_vectorized) {
if (OB_FAIL(datum_store.try_add_row(*output_exprs,
eval_ctx,
INT64_MAX,
added))) {
LOG_WARN("try add row to datum store failed", KR(ret));
} else if (!added) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("row wasn't added to datum store", KR(ret));
}
} else {
if (OB_FAIL(datum_store.try_add_batch(*output_exprs,
eval_ctx,
read_rows,
INT64_MAX,
added))) {
LOG_WARN("try add batch to datum store failed", KR(ret));
} else if (!added) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("batch wasn't added to datum store", KR(ret));
}
}
while (OB_SUCC(ret)) {
added = false;
if (!is_vectorized) {
scan_rtdef->p_pd_expr_op_->clear_evaluated_flag();
if (OB_FAIL(result.get_next_row())) {
if (OB_ITER_END != ret) {
LOG_WARN("get next row from result failed", KR(ret));
} else if (scan_op.need_all_output()) {
ret = scan_op.switch_scan_group();
if (OB_SUCC(ret)) {
continue;
}
}
} else {
if (OB_FAIL(datum_store.try_add_row(*output_exprs,
eval_ctx,
INT64_MAX,
added))) {
LOG_WARN("try add row to datum store failed", KR(ret));
} else if (!added) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("row wasn't added to datum store", KR(ret));
}
}
} else {
scan_rtdef->p_pd_expr_op_->clear_evaluated_flag();
read_rows = 0;
if (iter_end) {
ret = OB_ITER_END;
} else if (OB_FAIL(result.get_next_rows(read_rows, max_batch_size))) {
if (OB_ITER_END != ret) {
LOG_WARN("get next rows from result failed", KR(ret));
} else {
if (scan_op.need_all_output()) {
ret = scan_op.switch_scan_group();
if (OB_SUCC(ret)) {
continue;
}
}
if (OB_ITER_END == ret) {
iter_end = true;
ret = OB_SUCCESS;
}
}
}
if (OB_FAIL(ret) || 0 == read_rows) {
// do nothing
} else if (OB_FAIL(datum_store.try_add_batch(*output_exprs,
eval_ctx,
read_rows,
INT64_MAX,
added))) {
LOG_WARN("try add batch to datum store failed", KR(ret));
} else if (!added) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("batch wasn't added to datum store", KR(ret));
}
}
}
if (OB_ITER_END == ret) {
ret = OB_SUCCESS;
}
if (OB_SUCC(ret)) {
if (OB_FAIL(datum_store.finish_add_row())) {
LOG_WARN("datum store finish add row failed", KR(ret));
} else if (OB_FAIL(tcb->result_iter_.init(&tcb->datum_store_))) {
LOG_WARN("init das tcb result iter failed", KR(ret));
}
}
}
if (OB_SUCC(ret)) {
if (OB_FAIL(tcb_map_.insert_and_get(tcb_info, tcb))) {
LOG_WARN("insert das tcb failed", KR(ret));
} else {
tcb_map_.revert(tcb);
}
}
if (OB_FAIL(ret) && NULL != tcb) {
tcb->datum_store_.reset();
tcb->result_iter_.reset();
if (NULL != tcb->stored_row_arr_) {
ob_free(tcb->stored_row_arr_);
}
tcb->~ObDASTCB();
op_free(tcb);
tcb = NULL;
}
}
}
return ret;
}
int ObDASTaskResultMgr::erase_task_result(int64_t task_id)
{
int ret = OB_SUCCESS;
DASTCBInfo tcb_info(task_id);
ObDASTCB *tcb = NULL;
if (OB_FAIL(tcb_map_.get(tcb_info, tcb))) {
if (OB_ENTRY_NOT_EXIST == ret) {
ret = OB_SUCCESS;
LOG_TRACE("das tcb was already removed", K(task_id));
} else {
LOG_WARN("get das tcb failed", KR(ret), K(task_id));
}
} else if (OB_ISNULL(tcb)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("das tcb is null", KR(ret), K(task_id));
} else if (OB_UNLIKELY(tcb->is_exiting_)) {
// tcb is already erased, remove from map failed last time
} else if (OB_UNLIKELY(tcb->is_reading_)) {
ret = OB_EAGAIN;
LOG_TRACE("someone else is reading tcb, try again later", KR(ret), K(task_id));
} else {
bool is_already_exiting = false;
if (OB_FAIL(tcb->register_exiting(is_already_exiting))) {
LOG_WARN("register exiting failed", KR(ret), K(task_id));
} else {
if (!is_already_exiting) {
// we have registered exiting flag for the first time, need to reset tcb
tcb->datum_store_.reset();
tcb->result_iter_.reset();
if (NULL != tcb->stored_row_arr_) {
ob_free(tcb->stored_row_arr_);
tcb->stored_row_arr_ = NULL;
}
if (OB_FAIL(tcb_map_.del(tcb_info))) {
LOG_WARN("delete tcb failed", KR(ret), K(task_id));
}
} else {
// tcb was already exiting, no need to reset anything
}
}
}
if (NULL != tcb) {
tcb_map_.revert(tcb);
}
return ret;
}
int ObDASTaskResultMgr::iterator_task_result(int64_t task_id,
ObChunkDatumStore &datum_store,
bool &has_more)
{
int ret = OB_SUCCESS;
has_more = false;
DASTCBInfo tcb_info(task_id);
ObDASTCB *tcb = NULL;
if (OB_FAIL(tcb_map_.get(tcb_info, tcb))) {
LOG_WARN("get das tcb failed", KR(ret), K(task_id));
} else if (OB_ISNULL(tcb)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("das tcb is null", KR(ret), K(task_id));
} else if (tcb->is_exiting_) {
// The background GC thread is already cleaning up this tcb,
// and it will be removed from the hash map shortly.
// This happens when the task result has expired meaning the
// SQL has timed out.
ret = OB_TIMEOUT;
LOG_WARN("das tcb is exiting", KR(ret), K(task_id));
} else if (tcb->is_reading_) {
ret = OB_EAGAIN;
LOG_TRACE("someone else is reading tcb, try again later", KR(ret), K(task_id));
} else if (!datum_store.is_inited()
&& OB_FAIL(datum_store.init(INT64_MAX,
MTL_ID(),
common::ObCtxIds::DEFAULT_CTX_ID,
"DASTaskResMgr",
false))) {
LOG_WARN("init datum store failed", KR(ret));
} else {
if (OB_FAIL(tcb->register_reading())) {
LOG_WARN("unregister reading tcb failed", KR(ret), K(task_id));
} else {
bool added = false;
ObChunkDatumStore::Iterator &iter = tcb->result_iter_;
int64_t &read_rows = tcb->read_rows_;
while (OB_SUCC(ret) && !has_more) {
int64_t memory_limit = das::OB_DAS_MAX_PACKET_SIZE;
added = false;
if (datum_store.get_row_cnt() == 0) {
// make sure RPC response contains at least one row or one batch
memory_limit = INT64_MAX;
}
if (!tcb->is_vectorized_) {
const ObChunkDatumStore::StoredRow *&sr = tcb->stored_row_;
if (NULL == sr) {
if (OB_FAIL(iter.get_next_row(sr))) {
if (OB_ITER_END != ret) {
LOG_WARN("get next row from iter failed", KR(ret), K(task_id));
}
sr = NULL;
} else if (OB_ISNULL(sr)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("stored row is null", KR(ret), K(task_id), KP(sr));
}
} else {
// sr was read from last RPC, but wasn't included in the RPC response
// due to response size limit.
}
if (OB_FAIL(ret)) {
// do nothing
} else if (OB_FAIL(datum_store.try_add_row(*sr, memory_limit, added))) {
LOG_WARN("try add row to datum store failed", KR(ret), K(task_id));
} else if (!added) {
has_more = true;
// sr is saved at tcb->stored_row_, and will be included in next RPC.
} else {
sr = NULL;
}
} else {
const ObChunkDatumStore::StoredRow **srs = tcb->stored_row_arr_;
if (0 == read_rows) {
if (OB_FAIL(iter.get_next_batch(srs, tcb->max_batch_size_, read_rows))) {
if (OB_ITER_END != ret) {
LOG_WARN("get next batch from iter failed", KR(ret), K(task_id));
}
read_rows = 0;
} else if (0 == read_rows) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("no rows were read", KR(ret), K(task_id), K(read_rows));
}
} else {
// srs were read from last RPC, but weren't included in the RPC response
// due to response size limit.
}
if (OB_FAIL(ret)) {
// do nothing
} else if (OB_FAIL(datum_store.try_add_batch(srs,
read_rows,
memory_limit,
added))) {
LOG_WARN("try add batch to datum store failed", KR(ret), K(task_id));
} else if (!added) {
has_more = true;
} else {
read_rows = 0;
}
}
}
if (OB_ITER_END == ret) {
ret = OB_SUCCESS;
}
if (OB_SUCC(ret)) {
tcb->packet_cnt_++;
}
int save_ret = ret;
if (OB_FAIL(tcb->unregister_reading())) {
LOG_WARN("unregister tcb reading failed", KR(ret), K(task_id));
} else if (!has_more && OB_FAIL(erase_task_result(task_id))) {
LOG_WARN("erase task result failed", KR(ret), K(task_id));
}
ret = save_ret;
}
}
if (NULL != tcb) {
tcb_map_.revert(tcb);
}
return ret;
}
int ObDASTaskResultMgr::remove_expired_results()
{
int ret = OB_SUCCESS;
gc_.set_current_time();
if (OB_FAIL(tcb_map_.remove_if(gc_))) {
LOG_WARN("remove expired results from tcb map failed", KR(ret));
}
return ret;
}
bool ObDASTaskResultGC::operator() (const DASTCBInfo &tcb_info, ObDASTCB *tcb)
{
int ret = OB_SUCCESS;
bool remove = false;
if (OB_ISNULL(tcb)) {
ret = OB_ERR_UNEXPECTED;
remove = false;
LOG_WARN("tcb is null", KR(ret), K(tcb_info), KP(tcb));
} else if (tcb->expire_ts_ < cur_time_) {
if (OB_FAIL(task_result_mgr_->erase_task_result(tcb_info.get_value()))) {
remove = false;
LOG_WARN("erase task result failed", KR(ret), K(tcb_info));
} else {
remove = true;
}
}
return remove;
}
ObDASTaskResultGCRunner& ObDASTaskResultGCRunner::get_instance()
{
static ObDASTaskResultGCRunner gc_runner;
return gc_runner;
}
int ObDASTaskResultGCRunner::schedule_timer_task()
{
int ret = OB_SUCCESS;
ObDASTaskResultGCRunner& gc_runner = get_instance();
if (OB_FAIL(TG_SCHEDULE(lib::TGDefIDs::ServerGTimer, gc_runner,
ObDASTaskResultGCRunner::REFRESH_INTERVAL, true))) {
LOG_WARN("schedule das task result gc runner failed", K(ret));
}
return ret;
}
void ObDASTaskResultGCRunner::runTimerTask()
{
int ret = OB_SUCCESS;
omt::TenantIdList all_tenants;
GCTX.omt_->get_tenant_ids(all_tenants);
for (int i = 0; OB_SUCC(ret) && i < all_tenants.size(); ++i) {
uint64_t tenant_id = all_tenants[i];
if (is_virtual_tenant_id(tenant_id)) {
// skip virtual tenant
} else {
MAKE_TENANT_SWITCH_SCOPE_GUARD(guard);
if (OB_FAIL(guard.switch_to(tenant_id))) {
LOG_WARN("tenant switch failed during das task result gc", KR(ret), K(tenant_id));
} else {
ObDataAccessService * das = NULL;
if (OB_ISNULL(das = MTL(ObDataAccessService *))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("das is null", K(ret), KP(das));
} else if (OB_FAIL(das->get_task_res_mgr().remove_expired_results())) {
LOG_WARN("remove expired results failed", KR(ret), K(tenant_id));
}
}
}
// ignore error code
ret = OB_SUCCESS;
}
}
} // namespace sql
} // namespace oceanbase