This commit is contained in:
2026-04-09 11:28:43 +08:00
parent 3d46c697a0
commit ce2a91d9f5
3 changed files with 200 additions and 25 deletions
+82 -14
View File
@@ -40,6 +40,11 @@ type Server struct {
memMu sync.RWMutex // 保护内存索引的读写(刷盘时读操作不阻塞)
rowCount int64 // 内存中累计的索引条目总数(触发刷盘)
flushMu sync.Mutex // 确保同一时刻只有一个 flush 在执行
// flush 期间的索引读缓存:避免 mergeKey 对每个 key 单独开读事务
indexCache map[string][]storage.IndexEntry
indexCacheMu sync.RWMutex
indexCacheHits int64 // 缓存命中计数(原子)
}
// New 创建一个 search Server(内嵌收获服务,统一在同一端口)。
@@ -1205,22 +1210,53 @@ func (s *Server) handleIngest(w http.ResponseWriter, r *http.Request) {
return
}
s.memMu.Lock()
// 阶段 1:收集需要阈值检查的 key,快速释放锁
type keyCheck struct {
word string
weight float32
memLen int
entries []storage.IndexEntry
}
toCheck := make([]keyCheck, 0, len(payload.Keywords))
for _, kw := range payload.Keywords {
key := kw.Word
entries := s.mem[key]
entries := s.mem[kw.Word]
if len(entries) > 15 {
low := s.lowThreshold(key)
if float64(kw.Weight) < low {
continue
}
toCheck = append(toCheck, keyCheck{kw.Word, kw.Weight, len(entries), entries})
} else {
s.mem[kw.Word] = append(entries, storage.IndexEntry{
Weight: kw.Weight,
URL: payload.URL,
})
atomic.AddInt64(&s.rowCount, 1)
}
s.mem[key] = append(entries, storage.IndexEntry{
Weight: kw.Weight,
URL: payload.URL,
})
atomic.AddInt64(&s.rowCount, 1)
}
s.memMu.Unlock()
// 阶段 2:锁外读 db 做阈值检查(避免持锁时做慢 I/O)
if len(toCheck) > 0 {
s.memMu.Lock()
for _, kc := range toCheck {
// 重新读取最新长度(可能被其他请求修改)
current := s.mem[kc.word]
if len(current) > kc.memLen {
// 条目被其他请求增加了,重新检查
low := s.lowThreshold(kc.word)
if float64(kc.weight) < low {
continue
}
}
low := s.lowThreshold(kc.word)
if float64(kc.weight) < low {
continue
}
s.mem[kc.word] = append(s.mem[kc.word], storage.IndexEntry{
Weight: kc.weight,
URL: payload.URL,
})
atomic.AddInt64(&s.rowCount, 1)
}
s.memMu.Unlock()
}
if atomic.LoadInt64(&s.rowCount) > int64(config.BigCleanThreshold()) {
go s.Flush()
}
@@ -1235,7 +1271,7 @@ func (s *Server) handleFlush(w http.ResponseWriter, r *http.Request) {
// lowThreshold 返回某关键词在已有大量条目时,新条目所需的最低权重阈值。
func (s *Server) lowThreshold(key string) float64 {
existing, _ := s.db.GetIndex(key)
existing := s.getCachedIndex(key)
maxURLsPerKey := config.MaxURLsPerKey()
if len(existing) < maxURLsPerKey {
return -1
@@ -1252,7 +1288,13 @@ func (s *Server) flush() {
if !s.flushMu.TryLock() {
return
}
defer s.flushMu.Unlock()
defer func() {
s.flushMu.Unlock()
// 清除索引读缓存
s.indexCacheMu.Lock()
s.indexCache = nil
s.indexCacheMu.Unlock()
}()
s.memMu.Lock()
snapshot := s.mem
s.mem = make(map[string][]storage.IndexEntry)
@@ -1260,6 +1302,17 @@ func (s *Server) flush() {
s.memMu.Unlock()
totalKeys := len(snapshot)
log.Printf("[harvester] flushing %d keys", totalKeys)
// 预热索引读缓存:一次 ForEachIndex 读取全部索引,避免 mergeKey 逐个读事务
indexCache := make(map[string][]storage.IndexEntry, totalKeys)
s.db.ForEachIndex(func(keyword string, entries []storage.IndexEntry) error {
indexCache[keyword] = entries
return nil
})
s.indexCacheMu.Lock()
s.indexCache = indexCache
s.indexCacheMu.Unlock()
log.Printf("[harvester] index cache warmed: %d keys loaded", len(indexCache))
items := make([]struct {
key string
entries []storage.IndexEntry
@@ -1309,9 +1362,24 @@ func (s *Server) flush() {
log.Printf("[harvester] flush done, %d keys written", len(batch))
}
// getCachedIndex 优先从读缓存获取索引,缓存未命中则读 db。
func (s *Server) getCachedIndex(key string) []storage.IndexEntry {
s.indexCacheMu.RLock()
if s.indexCache != nil {
if entries, ok := s.indexCache[key]; ok {
s.indexCacheMu.RUnlock()
atomic.AddInt64(&s.indexCacheHits, 1)
return entries
}
}
s.indexCacheMu.RUnlock()
entries, _ := s.db.GetIndex(key)
return entries
}
// mergeKey 将新条目和磁盘已有条目合并后返回最终列表。
func (s *Server) mergeKey(key string, newEntries []storage.IndexEntry) []storage.IndexEntry {
existing, _ := s.db.GetIndex(key)
existing := s.getCachedIndex(key)
if len(existing) == 0 && len(newEntries) < config.MinURLsForNewKey() {
return nil
}