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oceanbase/src/sql/dtl/ob_dtl_channel_loop.cpp

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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_DTL
#include "ob_dtl_channel_loop.h"
#include "share/interrupt/ob_global_interrupt_call.h"
#include "observer/omt/ob_tenant_config_mgr.h"
#include "share/diagnosis/ob_sql_monitor_statname.h"
#include "observer/omt/ob_th_worker.h"
#include "share/ob_occam_time_guard.h"
#include "sql/engine/px/ob_px_util.h"
using namespace oceanbase::common;
namespace oceanbase {
using namespace omt;
namespace sql {
namespace dtl {
ObDtlChannelLoop::ObDtlChannelLoop()
: proc_map_(),
interrupt_proc_(NULL),
chans_(),
next_idx_(0),
last_msg_type_(static_cast<uint16_t>(ObDtlMsgType::MAX)),
cond_(ObWaitEventIds::PX_LOOP_COND_WAIT),
ignore_interrupt_(false),
tenant_id_(UINT64_MAX),
timeout_(INT64_MAX),
proxy_first_buffer_cache_(nullptr),
spin_lock_(common::ObLatchIds::DTL_CHANNEL_LIST_LOCK),
mock_addr_(),
sentinel_node_(1, 0, mock_addr_),
n_first_no_data_(0),
op_monitor_info_(default_op_monitor_info_),
first_data_get_(false),
process_func_(last_msg_type_, proc_map_),
use_interm_result_(false),
eof_channel_cnt_(0),
loop_times_(0),
begin_wait_time_(0),
process_query_time_(0),
last_dump_channel_time_(0),
query_timeout_ts_(0)
{
op_monitor_info_.otherstat_5_id_ = ObSqlMonitorStatIds::DTL_LOOP_TOTAL_MISS_AFTER_DATA;
op_monitor_info_.otherstat_6_id_ = ObSqlMonitorStatIds::DTL_LOOP_TOTAL_MISS;
sentinel_node_.prev_link_ = &sentinel_node_;
sentinel_node_.next_link_ = &sentinel_node_;
}
ObDtlChannelLoop::ObDtlChannelLoop(ObMonitorNode &op_monitor_info)
: proc_map_(),
interrupt_proc_(NULL),
chans_(),
next_idx_(0),
last_msg_type_(static_cast<uint16_t>(ObDtlMsgType::MAX)),
cond_(ObWaitEventIds::PX_LOOP_COND_WAIT),
ignore_interrupt_(false),
tenant_id_(UINT64_MAX),
timeout_(INT64_MAX),
proxy_first_buffer_cache_(nullptr),
spin_lock_(common::ObLatchIds::DTL_CHANNEL_LIST_LOCK),
mock_addr_(),
sentinel_node_(1, 0, mock_addr_),
n_first_no_data_(0),
op_monitor_info_(op_monitor_info),
first_data_get_(false),
process_func_(last_msg_type_, proc_map_),
use_interm_result_(false),
eof_channel_cnt_(0),
loop_times_(0),
begin_wait_time_(0),
process_query_time_(0),
last_dump_channel_time_(0),
query_timeout_ts_(0)
{
op_monitor_info_.otherstat_5_id_ = ObSqlMonitorStatIds::DTL_LOOP_TOTAL_MISS_AFTER_DATA;
op_monitor_info_.otherstat_6_id_ = ObSqlMonitorStatIds::DTL_LOOP_TOTAL_MISS;
sentinel_node_.prev_link_ = &sentinel_node_;
sentinel_node_.next_link_ = &sentinel_node_;
}
void ObDtlChannelLoop::notify(ObDtlChannel &chan)
{
UNUSED(chan);
add_last_data_list(&chan);
cond_.signal();
}
int ObDtlChannelLoop::has_first_buffer(uint64_t chan_id, bool &has_first_buffer)
{
int ret = OB_SUCCESS;
has_first_buffer = false;
if (nullptr != proxy_first_buffer_cache_) {
if (OB_FAIL(proxy_first_buffer_cache_->has_first_buffer(chan_id, has_first_buffer))) {
LOG_WARN("failed to get first buffer", K(ret));
} else {
LOG_DEBUG("trace has first buffer", K(chan_id), KP(chan_id), K(has_first_buffer),
KP(proxy_first_buffer_cache_), K(proxy_first_buffer_cache_->get_first_buffer_key()));
}
}
return ret;
}
int ObDtlChannelLoop::set_first_buffer(uint64_t chan_id)
{
int ret = OB_SUCCESS;
if (nullptr != proxy_first_buffer_cache_) {
if (OB_FAIL(proxy_first_buffer_cache_->set_first_buffer(chan_id))) {
LOG_WARN("failed to get first buffer", K(ret));
}
}
return ret;
}
int ObDtlChannelLoop::unregister_channel(ObDtlChannel &chan)
{
int ret = OB_SUCCESS;
int find_idx = -1;
for (int i = 0; i != chans_.count(); i++) {
if (&chan == chans_[i]) {
find_idx = i;
break;
}
}
if (find_idx >= 0) {
ret = chans_.remove(find_idx);
} else {
ret = OB_ENTRY_NOT_EXIST;
LOG_WARN("channel not exist, removed already?", K(chan), K(ret));
}
return ret;
}
int ObDtlChannelLoop::unregister_all_channel()
{
int ret = OB_SUCCESS;
int tmp_ret = OB_SUCCESS;
for (int64_t i = chans_.count() - 1; i >= 0; --i) {
if (OB_SUCCESS != (tmp_ret = chans_.remove(i))) {
if (OB_SUCCESS == ret) {
ret = tmp_ret; // record fisrt failure reason, but continue to remove
}
continue;
}
}
return ret;
}
int ObDtlChannelLoop::find(ObDtlChannel* ch, int64_t &out_idx)
{
int ret = OB_SUCCESS;
out_idx = OB_INVALID_ID;
ARRAY_FOREACH_X(chans_, idx, cnt, OB_INVALID_ID == out_idx) {
if (ch == chans_.at(idx)) {
out_idx = idx;
}
}
if (OB_INVALID_ID == out_idx) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("channel not found", K(ch), KP(ch->get_id()), K(ch->get_peer()), K(out_idx));
}
return ret;
}
int ObDtlChannelLoop::ObDtlChannelLoopProc::process(
const ObDtlLinkedBuffer &buffer, bool &transferred)
{
int ret = OB_SUCCESS;
ObDtlMsgHeader header;
if (buffer.is_data_msg()) {
last_msg_type_ = static_cast<int16_t>(ObDtlMsgType::PX_NEW_ROW);
if (last_msg_type_ >= static_cast<int16_t>(ObDtlMsgType::MAX)) {
ret = OB_INVALID_ARGUMENT;
SQL_DTL_LOG(WARN, "channel has received message with unknown type", K(last_msg_type_));
} else if (proc_map_[last_msg_type_] == nullptr){
ret = OB_INVALID_ARGUMENT;
SQL_DTL_LOG(WARN, "channel has received message without processor", K(last_msg_type_));
} else if (OB_FAIL(proc_map_[last_msg_type_]->process(buffer, transferred))) {
if (OB_ITER_END != ret) {
LOG_WARN("process message in channel fail", K(ret), K(last_msg_type_));
} else {
LOG_TRACE("channel loop receive ob iter end");
}
}
} else if (OB_FAIL(ObDtlLinkedBuffer::deserialize_msg_header(buffer, header))) {
// 这里可能是OB_ITER_END，不能打WARN日志.
LOG_TRACE("failed to deserialize msg", K(ret), K(&buffer), K(lbt()));
} else {
last_msg_type_ = header.type_;
if (proc_map_[header.type_] == nullptr) {
ret = OB_INVALID_ARGUMENT;
SQL_DTL_LOG(WARN, "channel has received message without processor",
K(header), K(ret));
} else if (OB_FAIL(proc_map_[header.type_]->process(buffer, transferred))) {
LOG_WARN("process message in channel fail",
K(header), K(ret));
}
}
return ret;
}
int ObDtlChannelLoop::process_base(ObIDltChannelLoopPred *pred, int64_t &hinted_channel, int64_t timeout)
{
int ret = OB_SUCCESS;
if (chans_.count() == 0) {
ret = OB_INVALID_ARGUMENT;
LOG_ERROR("channel hasn't set", K(ret));
} else {
// 处理思路：
// 1. 轮询所有 channel，如果能收到一个数据，则成功
// 2. 如果没有任何消息，则等待消息唤醒
// 3. 被唤醒后，再轮询所有 channel 是否有数据可处理，如果没有则返回 EAGAIN
//
uint32_t wait_key = cond_.get_key();
if (OB_UNLIKELY(nullptr != pred)) {
if (OB_UNLIKELY(OB_INVALID_INDEX_INT64 != hinted_channel)) {
next_idx_ = hinted_channel % chans_.count();
}
ret = process_channels(pred, hinted_channel);
} else {
if (OB_UNLIKELY(OB_INVALID_INDEX_INT64 != hinted_channel)) {
int64_t chan_cnt = chans_.count();
bool last_row_in_buffer = false;
// try best to process hinted channel
next_idx_ = hinted_channel % chan_cnt;
hinted_channel = OB_INVALID_INDEX_INT64;
if (OB_SUCC(chans_[next_idx_]->process1(&process_func_, 0, last_row_in_buffer))) {
hinted_channel = next_idx_;
} else if (OB_EAGAIN == ret) {
ret = process_channel(hinted_channel);
}
} else {
ret = process_channel(hinted_channel);
}
}
if (OB_SUCC(ret)) {
// succ process one channel
} else if (OB_EAGAIN == ret) {
begin_wait_time_counting();
// 通过TPCH 100G Q1测试发现，轮询时间间隔会导致性能有差异，轮询时间间隔较短
// 会占用大量CPU，导致CPU利用率不高，从而影响性能
if (timeout > 0) {
cond_.wait(wait_key, timeout);
} else if (OB_UNLIKELY(INT64_MAX == timeout_)) {
ObTenantConfigGuard tenant_config(TENANT_CONF(tenant_id_));
if (tenant_config.is_valid()) {
timeout_ = tenant_config->_parallel_server_sleep_time * 1000;
cond_.wait(wait_key, timeout_);
LOG_DEBUG("channel loop polling time", K(timeout_), K(timeout), K(ret));
} else {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("failed to init tenant config", K(tenant_id_), K(ret));
}
} else {
cond_.wait(wait_key, timeout_);
}
end_wait_time_counting();
} else {
LOG_WARN("fail process channel", K(ret));
}
++loop_times_;
if ((loop_times_ & (INTERRUPT_CHECK_TIMES - 1)) == 0) {
last_dump_channel_time_ = last_dump_channel_time_ < process_query_time_ ? process_query_time_ : last_dump_channel_time_;
int64_t curr_time = ::oceanbase::common::ObTimeUtility::current_time();
if (OB_UNLIKELY(curr_time - last_dump_channel_time_ >= static_cast<int64_t> (100_s))) {
last_dump_channel_time_ = curr_time;
LOG_WARN("dump channel loop info for query which active for more than 100 seconds", K(process_query_time_), K(curr_time), K(timeout), K(timeout_), K(query_timeout_ts_));
int64_t idx = -1;
int64_t last_in_msg_time = INT64_MAX;
// Find a channel that has not received data for the longest time
for (int64_t i = 0; i < chans_.count(); ++i) {
if (nullptr != chans_.at(i)) {
ObDtlBasicChannel *channel = static_cast<ObDtlBasicChannel *> (chans_.at(i));
if (channel->get_op_metric().get_last_in_ts() < last_in_msg_time) {
last_in_msg_time = channel->get_op_metric().get_last_in_ts();
idx = i;
}
}
}
if (-1 == idx) {
LOG_WARN("no channel exists");
} else {
ObDtlBasicChannel *channel = static_cast<ObDtlBasicChannel *> (chans_.at(idx));
LOG_WARN("dump channel info for query which active for more than 100 seconds", K(idx), K(channel->get_id()), K(channel->get_peer_id()), K(channel->get_peer()), K(channel->get_op_metric()));
}
}
}
if ((loop_times_ & (SERVER_ALIVE_CHECK_TIMES - 1)) == 0) {
for (int64_t i = 0; i < chans_.count(); ++i) {
if (nullptr != chans_.at(i)) {
ObDtlBasicChannel *ch = static_cast<ObDtlBasicChannel *> (chans_.at(i));
if (OB_UNLIKELY(ObPxCheckAlive::is_in_blacklist(ch->get_peer(),
get_process_query_time()))) {
ret = OB_RPC_CONNECT_ERROR;
LOG_WARN("peer no in communication, maybe crashed", K(ret), K(ch->get_peer()),
K(static_cast<int64_t>(GCONF.cluster_id)));
}
}
}
}
if (OB_UNLIKELY(OB_RPC_CONNECT_ERROR == ret)) {
} else if (ignore_interrupt_) {
// do nothing.
} else if ((loop_times_ & (INTERRUPT_CHECK_TIMES - 1)) == 0 && OB_UNLIKELY(IS_INTERRUPTED())) {
// 中断错误处理
// overwrite ret
ObInterruptCode &code = GET_INTERRUPT_CODE();
ret = code.code_;
LOG_WARN("message loop is interrupted", K(code), K(ret));
}
}
return ret;
}
// 目前使用process处理数据主要可以分为3类
// 1）fifo，纯拿数据，不计较数据顺序
// 2）merge receive，优先拿排序列，没有，则任意数据，类似1）
// 1)+2) -> 使用process_one
// 3）merge sort coord，pred限制拿的数据，如要求是控制消息或者排序对应的channel数据
// 3）-> 使用process_one_if
int ObDtlChannelLoop::process_one(int64_t &hinted_channel, int64_t timeout)
{
int ret = OB_SUCCESS;
ret = process_base(nullptr, hinted_channel, timeout);
if (OB_SUCC(ret) && OB_INVALID_INDEX_INT64 == hinted_channel) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected status: get data from invalid channel", K(hinted_channel));
}
return ret;
}
int ObDtlChannelLoop::process_any(int64_t timeout)
{
int64_t hinted_channel = OB_INVALID_INDEX_INT64;
return process_base(nullptr, hinted_channel, timeout);
}
int ObDtlChannelLoop::process_one_if(ObIDltChannelLoopPred *pred, int64_t &ret_channel, int64_t timeout)
{
int ret = OB_SUCCESS;
ret_channel = OB_INVALID_INDEX_INT64;
ret = process_base(pred, ret_channel, timeout);
if (OB_SUCC(ret) && OB_INVALID_INDEX_INT64 == ret_channel) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected status: get data from invalid channel", K(ret_channel));
}
return ret;
}
int ObDtlChannelLoop::process_channels(ObIDltChannelLoopPred *pred, int64_t &nth_channel)
{
int ret = OB_EAGAIN;
ObDtlChannel *chan = nullptr;
bool last_row_in_buffer = false;
int64_t chan_cnt = chans_.count();
for (int64_t i = 0; i != chan_cnt && ret == OB_EAGAIN; ++i) {
if (next_idx_ >= chan_cnt) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpect next idx", K(next_idx_), K(chan_cnt), K(ret));
} else {
chan = chans_[next_idx_];
if (OB_UNLIKELY(ObPxCheckAlive::is_in_blacklist(chan->get_peer(), get_process_query_time()))) {
ret = OB_RPC_CONNECT_ERROR;
LOG_WARN("peer no in communication, maybe crashed", K(ret), K(chan->get_peer()),
K(static_cast<int64_t>(GCONF.cluster_id)));
break;
} else if (nullptr == pred || pred->pred_process(next_idx_, chan)) {
if (OB_SUCC(chan->process1(&process_func_, 0, last_row_in_buffer))) {
nth_channel = next_idx_;
first_data_get_ = true;
if (last_row_in_buffer) {
// 每次接收一个channel的所有buffer
++next_idx_;
if (next_idx_ >= chan_cnt) {
next_idx_ %= chan_cnt;
}
}
break;
} else if (OB_ITER_END == ret) {
// return which channel is end
ret = OB_ERR_UNEXPECTED;
nth_channel = next_idx_;
LOG_WARN("finish get data from channel", K(nth_channel), K(ret), KP(chan->get_id()), K(chan->get_peer()));
}
}
++next_idx_;
if (next_idx_ >= chan_cnt) {
next_idx_ %= chan_cnt;
}
}
if (first_data_get_) {
// 第一次命中后的miss计数
// ObSqlMonitorStatIds::DTL_LOOP_TOTAL_MISS_AFTER_DATA;
++op_monitor_info_.otherstat_5_value_;
}
// ObSqlMonitorStatIds::DTL_LOOP_TOTAL_MISS;
++op_monitor_info_.otherstat_6_value_;
}
return ret;
}
int ObDtlChannelLoop::process_channel(int64_t &nth_channel)
{
int ret = OB_EAGAIN;
int64_t n_times = 0;
bool last_row_in_buffer = false;
if (ret == OB_EAGAIN && (OB_ISNULL(proxy_first_buffer_cache_) ||
use_interm_result_ ||
(0 < proxy_first_buffer_cache_->get_first_buffer_cnt() &&
n_first_no_data_ < chans_.count()))) {
// less then chan_cnt, then probe first buffer
ret = process_channels(nullptr, nth_channel);
}
ObDtlChannel *ch = sentinel_node_.next_link_;
while (OB_EAGAIN == ret && ch != &sentinel_node_) {
if (OB_SUCC(ch->process1(&process_func_, 0, last_row_in_buffer))) {
nth_channel = ch->get_loop_index();
break;
} else if (OB_EAGAIN == ret) {
remove_data_list(ch);
}
if (n_times > 100) {
// it's maybe unexpected !
LOG_WARN("loop times", K(n_times));
int tmp_ret = THIS_WORKER.check_status();
if (OB_SUCCESS != tmp_ret) {
ret = tmp_ret;
LOG_WARN("worker interrupt", K(tmp_ret), K(ret));
break;
}
ob_usleep<ObWaitEventIds::DTL_PROCESS_CHANNEL_SLEEP>(1);
}
++loop_times_;
if (ignore_interrupt_) {
} else if ((loop_times_ & (INTERRUPT_CHECK_TIMES - 1)) == 0 && OB_UNLIKELY(IS_INTERRUPTED())) {
ObInterruptCode &code = GET_INTERRUPT_CODE();
ret = code.code_;
LOG_WARN("message loop is interrupted", K(code), K(ret));
} else if ((loop_times_ & (SERVER_ALIVE_CHECK_TIMES - 1)) == 0
&& OB_UNLIKELY(ObPxCheckAlive::is_in_blacklist(ch->get_peer(),
get_process_query_time()))) {
ret = OB_RPC_CONNECT_ERROR;
LOG_WARN("peer no in communication, maybe crashed", K(ret), K(ch->get_peer()),
K(static_cast<int64_t>(GCONF.cluster_id)));
}
ch = sentinel_node_.next_link_;
++n_times;
}
return ret;
}
// for merge sort coord
// when merge sort coord can't get row for cur_channel
// then unblock blocked channel
// if not, then maybe hang
int ObDtlChannelLoop::unblock_channels(int64_t data_channel_idx)
{
int ret = OB_SUCCESS;
if (data_channel_idx >= chans_.count()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected status: data channel idx is invalid", K(ret),
K(data_channel_idx), K(chans_.count()));
} else {
ObDfcServer &dfc_server = DTL.get_dfc_server();
ObDtlChannel *ch = chans_.at(data_channel_idx);
if (nullptr == ch->get_dfc()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("invalid data channel, dfc is null", K(ret), K(data_channel_idx), K(chans_.count()));
} else {
if (OB_FAIL(dfc_server.unblock_channels(ch->get_dfc()))) {
LOG_WARN("failed to unblock channels", K(ret));
}
}
}
return ret;
}
// It's not used now !!!
// for merge sort coord
// when merge sort coord can't get row for cur_channel
// then unblock blocked channel
// if not, then maybe hang
// only for one channel
int ObDtlChannelLoop::unblock_channel(int64_t start_data_channel_idx, int64_t dfc_channel_idx)
{
int ret = OB_SUCCESS;
if (start_data_channel_idx >= chans_.count()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected status: data channel idx is invalid", K(ret),
K(start_data_channel_idx), K(chans_.count()));
} else {
ObDfcServer &dfc_server = DTL.get_dfc_server();
ObDtlChannel *ch = chans_.at(start_data_channel_idx);
if (nullptr == ch->get_dfc()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("invalid data channel, dfc is null", K(ret), K(start_data_channel_idx), K(chans_.count()));
} else {
if (OB_FAIL(dfc_server.unblock_channel(ch->get_dfc(), dfc_channel_idx))) {
LOG_WARN("failed to unblock channels", K(ret));
}
}
}
return ret;
}
} // dtl
} // sql
} // oceanbase
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