e5f884a6fc
BloomFilter in MoW table may consume lots of memory, and it's life cycle is same as segment. This patch try to improve the efficiency of recycling segment cache, to release the memory in time.
108 lines
3.9 KiB
C++
108 lines
3.9 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include "olap/segment_loader.h"
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#include "olap/rowset/rowset.h"
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#include "olap/tablet_schema.h"
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#include "util/stopwatch.hpp"
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namespace doris {
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SegmentLoader* SegmentLoader::_s_instance = nullptr;
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void SegmentLoader::create_global_instance(size_t capacity) {
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DCHECK(_s_instance == nullptr);
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static SegmentLoader instance(capacity);
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_s_instance = &instance;
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}
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SegmentLoader::SegmentLoader(size_t capacity) {
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_cache = std::unique_ptr<Cache>(
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new_lru_cache("SegmentMetaCache", capacity, LRUCacheType::NUMBER));
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}
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bool SegmentLoader::_lookup(const SegmentLoader::CacheKey& key, SegmentCacheHandle* handle) {
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auto lru_handle = _cache->lookup(key.encode());
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if (lru_handle == nullptr) {
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return false;
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}
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*handle = SegmentCacheHandle(_cache.get(), lru_handle);
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return true;
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}
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void SegmentLoader::_insert(const SegmentLoader::CacheKey& key, SegmentLoader::CacheValue& value,
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SegmentCacheHandle* handle) {
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auto deleter = [](const doris::CacheKey& key, void* value) {
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SegmentLoader::CacheValue* cache_value = (SegmentLoader::CacheValue*)value;
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cache_value->segments.clear();
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delete cache_value;
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};
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int64_t meta_mem_usage = 0;
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for (auto segment : value.segments) {
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meta_mem_usage += segment->meta_mem_usage();
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}
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auto lru_handle = _cache->insert(key.encode(), &value, sizeof(SegmentLoader::CacheValue),
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deleter, CachePriority::NORMAL, meta_mem_usage);
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*handle = SegmentCacheHandle(_cache.get(), lru_handle);
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}
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Status SegmentLoader::load_segments(const BetaRowsetSharedPtr& rowset,
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SegmentCacheHandle* cache_handle, bool use_cache) {
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SegmentLoader::CacheKey cache_key(rowset->rowset_id());
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if (_lookup(cache_key, cache_handle)) {
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cache_handle->owned = false;
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return Status::OK();
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}
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cache_handle->owned = !use_cache;
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std::vector<segment_v2::SegmentSharedPtr> segments;
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RETURN_NOT_OK(rowset->load_segments(&segments));
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if (use_cache) {
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// memory of SegmentLoader::CacheValue will be handled by SegmentLoader
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SegmentLoader::CacheValue* cache_value = new SegmentLoader::CacheValue();
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cache_value->segments = std::move(segments);
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_insert(cache_key, *cache_value, cache_handle);
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} else {
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cache_handle->segments = std::move(segments);
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}
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return Status::OK();
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}
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Status SegmentLoader::prune() {
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const int64_t curtime = UnixMillis();
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auto pred = [curtime](const void* value) -> bool {
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SegmentLoader::CacheValue* cache_value = (SegmentLoader::CacheValue*)value;
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return (cache_value->last_visit_time + config::tablet_rowset_stale_sweep_time_sec * 1000) <
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curtime;
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};
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MonotonicStopWatch watch;
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watch.start();
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// Prune cache in lazy mode to save cpu and minimize the time holding write lock
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int64_t prune_num = _cache->prune_if(pred, true);
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LOG(INFO) << "prune " << prune_num
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<< " entries in segment cache. cost(ms): " << watch.elapsed_time() / 1000 / 1000;
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return Status::OK();
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}
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} // namespace doris
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