| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| #include "olap/memtable_memory_limiter.h" |
| |
| #include <bvar/bvar.h> |
| |
| #include "common/config.h" |
| #include "olap/memtable.h" |
| #include "olap/memtable_writer.h" |
| #include "runtime/workload_group/workload_group_manager.h" |
| #include "util/doris_metrics.h" |
| #include "util/mem_info.h" |
| #include "util/metrics.h" |
| |
| namespace doris { |
| DEFINE_GAUGE_METRIC_PROTOTYPE_5ARG(memtable_memory_limiter_mem_consumption, MetricUnit::BYTES, "", |
| memtable_memory_limiter_mem_consumption, |
| Labels({{"type", "load"}})); |
| |
| bvar::LatencyRecorder g_memtable_memory_limit_latency_ms("mm_limiter_limit_time_ms"); |
| bvar::Adder<int> g_memtable_memory_limit_waiting_threads("mm_limiter_waiting_threads"); |
| bvar::Status<int64_t> g_memtable_active_memory("mm_limiter_mem_active", 0); |
| bvar::Status<int64_t> g_memtable_write_memory("mm_limiter_mem_write", 0); |
| bvar::Status<int64_t> g_memtable_flush_memory("mm_limiter_mem_flush", 0); |
| bvar::Status<int64_t> g_memtable_load_memory("mm_limiter_mem_load", 0); |
| bvar::Status<int64_t> g_load_hard_mem_limit("mm_limiter_limit_hard", 0); |
| bvar::Status<int64_t> g_load_soft_mem_limit("mm_limiter_limit_soft", 0); |
| bvar::Adder<uint64_t> g_flush_cuz_load_mem_exceed_hard_limit("flush_cuz_hard_limit"); |
| bvar::Adder<uint64_t> g_flush_cuz_sys_mem_exceed_soft_limit("flush_cuz_soft_limit"); |
| bvar::Adder<int> g_memtable_memory_limit_flush_memtable_count("mm_limiter_flush_memtable_count"); |
| bvar::LatencyRecorder g_memtable_memory_limit_flush_size_bytes("mm_limiter_flush_size_bytes"); |
| |
| // Calculate the total memory limit of all load tasks on this BE |
| static int64_t calc_process_max_load_memory(int64_t process_mem_limit) { |
| if (process_mem_limit == -1) { |
| // no limit |
| return -1; |
| } |
| int32_t max_load_memory_percent = config::load_process_max_memory_limit_percent; |
| return process_mem_limit * max_load_memory_percent / 100; |
| } |
| |
| MemTableMemoryLimiter::MemTableMemoryLimiter() {} |
| |
| MemTableMemoryLimiter::~MemTableMemoryLimiter() { |
| DEREGISTER_HOOK_METRIC(memtable_memory_limiter_mem_consumption); |
| } |
| |
| Status MemTableMemoryLimiter::init(int64_t process_mem_limit) { |
| _load_hard_mem_limit = calc_process_max_load_memory(process_mem_limit); |
| _load_soft_mem_limit = _load_hard_mem_limit * config::load_process_soft_mem_limit_percent / 100; |
| _load_safe_mem_permit = |
| _load_hard_mem_limit * config::load_process_safe_mem_permit_percent / 100; |
| g_load_hard_mem_limit.set_value(_load_hard_mem_limit); |
| g_load_soft_mem_limit.set_value(_load_soft_mem_limit); |
| _mem_tracker = std::make_unique<MemTracker>("AllMemTableMemory"); |
| REGISTER_HOOK_METRIC(memtable_memory_limiter_mem_consumption, |
| [this]() { return _mem_tracker->consumption(); }); |
| _log_timer.start(); |
| return Status::OK(); |
| } |
| |
| void MemTableMemoryLimiter::register_writer(std::weak_ptr<MemTableWriter> writer) { |
| std::lock_guard<std::mutex> l(_lock); |
| _writers.push_back(writer); |
| } |
| |
| int64_t MemTableMemoryLimiter::_sys_avail_mem_less_than_warning_water_mark() { |
| // reserve a small amount of memory so we do not trigger MinorGC |
| return doris::MemInfo::sys_mem_available_warning_water_mark() - |
| doris::GlobalMemoryArbitrator::sys_mem_available() + |
| config::memtable_limiter_reserved_memory_bytes; |
| } |
| |
| int64_t MemTableMemoryLimiter::_process_used_mem_more_than_soft_mem_limit() { |
| // reserve a small amount of memory so we do not trigger MinorGC |
| return GlobalMemoryArbitrator::process_memory_usage() - MemInfo::soft_mem_limit() + |
| config::memtable_limiter_reserved_memory_bytes; |
| } |
| |
| bool MemTableMemoryLimiter::_soft_limit_reached() { |
| return _mem_tracker->consumption() > _load_soft_mem_limit || _hard_limit_reached(); |
| } |
| |
| bool MemTableMemoryLimiter::_hard_limit_reached() { |
| return _mem_tracker->consumption() > _load_hard_mem_limit || |
| _sys_avail_mem_less_than_warning_water_mark() > 0 || |
| _process_used_mem_more_than_soft_mem_limit() > 0; |
| } |
| |
| bool MemTableMemoryLimiter::_load_usage_low() { |
| return _mem_tracker->consumption() <= _load_safe_mem_permit; |
| } |
| |
| int64_t MemTableMemoryLimiter::_need_flush() { |
| DBUG_EXECUTE_IF("MemTableMemoryLimiter._need_flush.random_flush", { |
| if (rand() % 100 < (100 * dp->param("percent", 0.5))) { |
| LOG(INFO) << "debug memtable need flush return 1"; |
| return 1; |
| } |
| }); |
| int64_t limit1 = _mem_tracker->consumption() - _load_soft_mem_limit; |
| int64_t limit2 = _sys_avail_mem_less_than_warning_water_mark(); |
| int64_t limit3 = _process_used_mem_more_than_soft_mem_limit(); |
| int64_t need_flush = std::max({limit1, limit2, limit3}); |
| return need_flush - _queue_mem_usage - _flush_mem_usage; |
| } |
| |
| void MemTableMemoryLimiter::handle_memtable_flush(std::function<bool()> cancel_check) { |
| // Check the soft limit. |
| DCHECK(_load_soft_mem_limit > 0); |
| do { |
| DBUG_EXECUTE_IF("MemTableMemoryLimiter.handle_memtable_flush.limit_reached", { |
| LOG(INFO) << "debug memtable limit reached"; |
| break; |
| }); |
| if (!_soft_limit_reached() || _load_usage_low()) { |
| return; |
| } |
| } while (false); |
| MonotonicStopWatch timer; |
| timer.start(); |
| std::unique_lock<std::mutex> l(_lock); |
| g_memtable_memory_limit_waiting_threads << 1; |
| bool first = true; |
| do { |
| if (!first) { |
| auto st = _hard_limit_end_cond.wait_for(l, std::chrono::milliseconds(1000)); |
| if (st == std::cv_status::timeout) { |
| LOG(INFO) << "timeout when waiting for memory hard limit end, try again"; |
| } |
| } |
| if (cancel_check && cancel_check()) { |
| LOG(INFO) << "cancelled when waiting for memtable flush"; |
| return; |
| } |
| first = false; |
| int64_t need_flush = _need_flush(); |
| if (need_flush > 0) { |
| auto limit = _hard_limit_reached() ? Limit::HARD : Limit::SOFT; |
| LOG(INFO) << "reached memtable memory " << (limit == Limit::HARD ? "hard" : "soft") |
| << ", " << GlobalMemoryArbitrator::process_memory_used_details_str() << ", " |
| << GlobalMemoryArbitrator::sys_mem_available_details_str() |
| << ", load mem: " << PrettyPrinter::print_bytes(_mem_tracker->consumption()) |
| << ", memtable writers num: " << _writers.size() |
| << ", active: " << PrettyPrinter::print_bytes(_active_mem_usage) |
| << ", queue: " << PrettyPrinter::print_bytes(_queue_mem_usage) |
| << ", flush: " << PrettyPrinter::print_bytes(_flush_mem_usage) |
| << ", need flush: " << PrettyPrinter::print_bytes(need_flush); |
| if (VLOG_DEBUG_IS_ON) { |
| auto log_str = doris::ProcessProfile::instance() |
| ->memory_profile() |
| ->process_memory_detail_str(); |
| LOG_LONG_STRING(INFO, log_str); |
| } |
| if (limit == Limit::HARD) { |
| g_flush_cuz_load_mem_exceed_hard_limit << 1; |
| } else if (limit == Limit::SOFT) { |
| g_flush_cuz_sys_mem_exceed_soft_limit << 1; |
| } else { |
| // will not reach here |
| } |
| _flush_active_memtables(need_flush); |
| } |
| } while (_hard_limit_reached() && !_load_usage_low()); |
| g_memtable_memory_limit_waiting_threads << -1; |
| timer.stop(); |
| int64_t time_ms = timer.elapsed_time() / 1000 / 1000; |
| g_memtable_memory_limit_latency_ms << time_ms; |
| if (time_ms > 0) { |
| LOG(INFO) << "waited " << PrettyPrinter::print(timer.elapsed_time(), TUnit::TIME_NS) |
| << " for memtable memory limit" |
| << ", " << GlobalMemoryArbitrator::process_memory_used_details_str() << ", " |
| << GlobalMemoryArbitrator::sys_mem_available_details_str() |
| << ", load mem: " << PrettyPrinter::print_bytes(_mem_tracker->consumption()) |
| << ", memtable writers num: " << _writers.size() |
| << ", active: " << PrettyPrinter::print_bytes(_active_mem_usage) |
| << ", queue: " << PrettyPrinter::print_bytes(_queue_mem_usage) |
| << ", flush: " << PrettyPrinter::print_bytes(_flush_mem_usage); |
| } |
| } |
| |
| int64_t MemTableMemoryLimiter::_flush_active_memtables(int64_t need_flush) { |
| if (need_flush <= 0) { |
| return 0; |
| } |
| |
| _refresh_mem_tracker(); |
| if (_active_writers.size() == 0) { |
| return 0; |
| } |
| |
| using WriterMem = std::pair<std::weak_ptr<MemTableWriter>, int64_t>; |
| auto cmp = [](WriterMem left, WriterMem right) { return left.second < right.second; }; |
| std::priority_queue<WriterMem, std::vector<WriterMem>, decltype(cmp)> heap(cmp); |
| |
| for (auto writer : _active_writers) { |
| auto w = writer.lock(); |
| if (w == nullptr) { |
| continue; |
| } |
| heap.emplace(w, w->active_memtable_mem_consumption()); |
| } |
| |
| int64_t mem_flushed = 0; |
| int64_t num_flushed = 0; |
| |
| while (mem_flushed < need_flush && !heap.empty()) { |
| auto [writer, sort_mem] = heap.top(); |
| heap.pop(); |
| auto w = writer.lock(); |
| if (w == nullptr) { |
| continue; |
| } |
| |
| int64_t mem = w->active_memtable_mem_consumption(); |
| if (mem < sort_mem * 0.9) { |
| // if the memtable writer just got flushed, don't flush it again |
| continue; |
| } |
| Status st = w->flush_async(); |
| if (!st.ok()) { |
| auto err_msg = fmt::format( |
| "tablet writer failed to reduce mem consumption by flushing memtable, " |
| "tablet_id={}, err={}", |
| w->tablet_id(), st.to_string()); |
| LOG(WARNING) << err_msg; |
| static_cast<void>(w->cancel_with_status(st)); |
| } |
| mem_flushed += mem; |
| num_flushed += (mem > 0); |
| g_memtable_memory_limit_flush_memtable_count << 1; |
| g_memtable_memory_limit_flush_size_bytes << mem; |
| } |
| LOG(INFO) << "flushed " << num_flushed << " out of " << _active_writers.size() |
| << " active writers, flushed size: " << PrettyPrinter::print_bytes(mem_flushed); |
| return mem_flushed; |
| } |
| |
| void MemTableMemoryLimiter::refresh_mem_tracker() { |
| std::lock_guard<std::mutex> l(_lock); |
| _refresh_mem_tracker(); |
| std::stringstream ss; |
| Limit limit = Limit::NONE; |
| if (_soft_limit_reached()) { |
| limit = _hard_limit_reached() ? Limit::HARD : Limit::SOFT; |
| ss << "reached " << (limit == Limit::HARD ? "hard" : "soft") << " limit"; |
| } else if (_last_limit == Limit::NONE) { |
| return; |
| } else { |
| ss << "ended " << (_last_limit == Limit::HARD ? "hard" : "soft") << " limit"; |
| } |
| |
| if (_last_limit == limit && _log_timer.elapsed_time() < LOG_INTERVAL) { |
| return; |
| } |
| |
| _last_limit = limit; |
| _log_timer.reset(); |
| LOG(INFO) << ss.str() |
| << ", load mem: " << PrettyPrinter::print_bytes(_mem_tracker->consumption()) |
| << ", memtable writers num: " << _writers.size() |
| << ", active: " << PrettyPrinter::print_bytes(_active_mem_usage) |
| << ", queue: " << PrettyPrinter::print_bytes(_queue_mem_usage) |
| << ", flush: " << PrettyPrinter::print_bytes(_flush_mem_usage); |
| if (VLOG_DEBUG_IS_ON) { |
| auto log_str = |
| doris::ProcessProfile::instance()->memory_profile()->process_memory_detail_str(); |
| LOG_LONG_STRING(INFO, log_str); |
| } |
| } |
| |
| void MemTableMemoryLimiter::_refresh_mem_tracker() { |
| _flush_mem_usage = 0; |
| _queue_mem_usage = 0; |
| _active_mem_usage = 0; |
| _active_writers.clear(); |
| for (auto it = _writers.begin(); it != _writers.end();) { |
| if (auto writer = it->lock()) { |
| // The memtable is currently used by writer to insert blocks. |
| auto active_usage = writer->active_memtable_mem_consumption(); |
| _active_mem_usage += active_usage; |
| if (active_usage > 0) { |
| _active_writers.push_back(writer); |
| } |
| |
| auto flush_usage = writer->mem_consumption(MemType::FLUSH); |
| _flush_mem_usage += flush_usage; |
| |
| auto write_usage = writer->mem_consumption(MemType::WRITE_FINISHED); |
| _queue_mem_usage += write_usage; |
| ++it; |
| } else { |
| *it = std::move(_writers.back()); |
| _writers.pop_back(); |
| } |
| } |
| _mem_usage = _active_mem_usage + _queue_mem_usage + _flush_mem_usage; |
| g_memtable_active_memory.set_value(_active_mem_usage); |
| g_memtable_write_memory.set_value(_queue_mem_usage); |
| g_memtable_flush_memory.set_value(_flush_mem_usage); |
| g_memtable_load_memory.set_value(_mem_usage); |
| VLOG_DEBUG << "refreshed mem_tracker, num writers: " << _writers.size(); |
| _mem_tracker->set_consumption(_mem_usage); |
| if (!_hard_limit_reached()) { |
| _hard_limit_end_cond.notify_all(); |
| } |
| } |
| |
| } // namespace doris |
