Пример #1
0
func (cp *CachePool) startMemcache() {
	if strings.Contains(cp.port, "/") {
		_ = os.Remove(cp.port)
	}
	commandLine := cp.rowCacheConfig.GetSubprocessFlags()
	cp.cmd = exec.Command(commandLine[0], commandLine[1:]...)
	if err := cp.cmd.Start(); err != nil {
		panic(NewTabletError(FATAL, "can't start memcache: %v", err))
	}
	attempts := 0
	for {
		time.Sleep(100 * time.Millisecond)
		c, err := memcache.Connect(cp.port, 30*time.Millisecond)
		if err != nil {
			attempts++
			if attempts >= 50 {
				cp.cmd.Process.Kill()
				// Avoid zombies
				go cp.cmd.Wait()
				// FIXME(sougou): Throw proper error if we can recover
				log.Fatal("Can't connect to memcache")
			}
			continue
		}
		if _, err = c.Set("health", 0, 0, []byte("ok")); err != nil {
			panic(NewTabletError(FATAL, "can't communicate with memcache: %v", err))
		}
		c.Close()
		break
	}
}
Пример #2
0
func (cp *CachePool) Open() {
	cp.mu.Lock()
	defer cp.mu.Unlock()
	if cp.pool != nil {
		panic(NewTabletError(FATAL, "rowcache is already open"))
	}
	if cp.rowCacheConfig.Binary == "" {
		panic(NewTabletError(FATAL, "rowcache binary not specified"))
	}
	cp.startMemcache()
	log.Infof("rowcache is enabled")
	f := func() (pools.Resource, error) {
		return memcache.Connect(cp.port, 10*time.Second)
	}
	cp.pool = pools.NewResourcePool(f, cp.capacity, cp.capacity, cp.idleTimeout)
	if cp.memcacheStats != nil {
		cp.memcacheStats.Open()
	}
}