fix(flash): check mount point and add metrics

with: #1000414729

Signed-off-by: clinx <chenlin1@oppo.com>
(cherry picked from commit a9c84eca6b)

cli/cmd/vol.go

@@ -331,7 +331,7 @@ func newVolCreateCmd(client *master.MasterClient) *cobra.Command {
 	cmd.Flags().Int64Var(&optRcTTL, CliFlagRemoteCacheTTL, cmdVolDefaultRemoteCacheTTL, "Remote cache ttl[Unit: s](must >= 10min, default 5day)")
 	cmd.Flags().Int64Var(&optRcReadTimeout, CliFlagRemoteCacheReadTimeout, cmdVolDefaultRemoteCacheReadTimeout, "Remote cache read timeout millisecond(must > 0)")
 	cmd.Flags().Int64Var(&optRemoteCacheMaxFileSizeGB, CliFlagRemoteCacheMaxFileSizeGB, cmdVolDefaultRemoteCacheMaxFileSizeGB, "Remote cache max file size[Unit: GB](must > 0)")
-	cmd.Flags().StringVar(&optRemoteCacheOnlyForNotSSD, CliFlagRemoteCacheOnlyForNotSSD, "false", "Remote cache only for not ssd(true|false)")
+	cmd.Flags().StringVar(&optRemoteCacheOnlyForNotSSD, CliFlagRemoteCacheOnlyForNotSSD, "true", "Remote cache only for not ssd(true|false)")
 	cmd.Flags().StringVar(&optRemoteCacheMultiRead, CliFlagRemoteCacheMultiRead, "false", "Remote cache follower read(true|false)")
 	cmd.Flags().Int64Var(&optFlashNodeTimeoutCount, CliFlagFlashNodeTimeoutCount, cmdVolDefaultFlashNodeTimeoutCount, "FlashNode timeout count, flashNode will be removed by client if it's timeout count exceeds this value")
 	cmd.Flags().Int64Var(&optRemoteCacheSameZoneTimeout, CliFlagRemoteCacheSameZoneTimeout, proto.DefaultRemoteCacheSameZoneTimeout, "Remote cache same zone timeout microsecond(must > 0)")

remotecache/flashnode/cachengine/engine.go

@@ -1046,6 +1046,44 @@ func (c *CacheEngine) GetCacheBytes() map[string]int64 {
 	return result
 }
 
+func (c *CacheEngine) GetLruUsageRatio() float64 {
+	var totalLen, totalCapacity int
+	c.lruCacheMap.Range(func(key, value interface{}) bool {
+		cacheItem := value.(*lruCacheItem)
+		totalLen += cacheItem.lruCache.Len()
+		totalCapacity += cacheItem.config.Capacity
+		return true
+	})
+	if totalCapacity > 0 {
+		return float64(totalLen) / float64(totalCapacity)
+	}
+	return 0
+}
+
+func (c *CacheEngine) GetDiskUsageRatio() map[string]float64 {
+	result := make(map[string]float64)
+	c.lruCacheMap.Range(func(key, value interface{}) bool {
+		cacheItem := value.(*lruCacheItem)
+		if atomic.LoadInt32(&cacheItem.disk.Status) == proto.ReadWrite {
+			fs := syscall.Statfs_t{}
+			if err := syscall.Statfs(cacheItem.disk.Path, &fs); err != nil {
+				log.LogErrorf("get disk(%s) stat err:%v", cacheItem.disk.Path, err)
+				return true
+			}
+			totalSpace := int64(fs.Blocks) * int64(fs.Bsize)
+			usedSpace := int64(fs.Blocks-fs.Bfree) * int64(fs.Bsize)
+			if totalSpace > 0 {
+				usageRatio := float64(usedSpace) / float64(totalSpace)
+				result[cacheItem.config.Path] = usageRatio
+			} else {
+				result[cacheItem.config.Path] = 0
+			}
+		}
+		return true
+	})
+	return result
+}
+
 func (c *CacheEngine) DoInactiveDisk(dataPath string) {
 	if value, ok := c.lruCacheMap.Load(dataPath); ok {
 		cacheItem := value.(*lruCacheItem)

remotecache/flashnode/flashnode.go

@@ -18,6 +18,7 @@ import (
 	"fmt"
 	"net"
 	"os"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"sync"
@@ -368,6 +369,10 @@ func (f *FlashNode) parseConfig(cfg *config.Config) (err error) {
 					continue
 				}
 			}
+			if os.Getenv(cachengine.EnvDockerTmpfs) == "" && !hasMountsOnLastTwoLevels(path) {
+				log.LogErrorf("path[%v] is not a mount point, skip it", path)
+				continue
+			}
 			totalSpace, err := strconv.ParseInt(arr[1], 10, 64)
 			if err != nil {
 				log.LogErrorf("invalid disk total space for path[%v]. Error: %s", path, err.Error())
@@ -739,3 +744,55 @@ func (f *FlashNode) cleanupStaleWarmupWorkers() {
 			staleCount, len(f.currentWarmUpWorkers))
 	}
 }
+
+// hasMountsOnLastTwoLevels returns true if either the parent directory or the
+// given path itself is a mount point. For example, for /home/service/var/data,
+// it checks whether /home/service/var OR /home/service/var/data is a mount target.
+func hasMountsOnLastTwoLevels(p string) bool {
+	abs := p
+	if !filepath.IsAbs(abs) {
+		var err error
+		if abs, err = filepath.Abs(p); err != nil {
+			return false
+		}
+	}
+	abs = filepath.Clean(abs)
+	parent := filepath.Dir(abs)
+
+	data, err := os.ReadFile("/proc/mounts")
+	if err != nil {
+		return false
+	}
+
+	mounts := make(map[string]struct{})
+	for _, line := range strings.Split(string(data), "\n") {
+		if line == "" {
+			continue
+		}
+		fields := strings.Fields(line)
+		if len(fields) < 2 {
+			continue
+		}
+		mp := unescapeMountField(fields[1])
+		mounts[mp] = struct{}{}
+	}
+
+	_, okParent := mounts[parent]
+	_, okSelf := mounts[abs]
+	return okParent || okSelf
+}
+
+func unescapeMountField(s string) string {
+	var b strings.Builder
+	for i := 0; i < len(s); i++ {
+		if s[i] == '\\' && i+3 < len(s) {
+			if o, err := strconv.ParseInt(s[i+1:i+4], 8, 0); err == nil {
+				b.WriteByte(byte(o))
+				i += 3
+				continue
+			}
+		}
+		b.WriteByte(s[i])
+	}
+	return b.String()
+}

remotecache/flashnode/metric.go

@@ -22,6 +22,11 @@ const (
 	MetricFlashNodeCacheBytes          = "flashNodeCacheBytes"
 	MetricFlashNodeHandleReadLatency   = "flashNodeHandleReadLatency"
 	MetricFlashNodeSourceDataLatency   = "flashNodeSourceDataLatency"
+	MetricFlashNodeHitCacheReadLatency = "flashNodeHitCacheReadLatency"
+	MetricFlashNodeFlowLimitedCount    = "flashNodeFlowLimitedCount"
+	MetricFlashNodeRunLimitedCount     = "flashNodeRunLimitedCount"
+	MetricFlashNodeLruUsageRatio       = "flashNodeLruUsageRatio"
+	MetricFlashNodeDiskUsageRatio      = "flashNodeDiskUsageRatio"
 )
 
 type FlashNodeMetrics struct {
@@ -36,6 +41,11 @@ type FlashNodeMetrics struct {
 	MetricCacheBytes          *exporter.Gauge
 	MetricHandleReadLatency   *exporter.Gauge
 	MetricSourceDataLatency   *exporter.Gauge
+	MetricHitCacheReadLatency *exporter.Gauge
+	MetricFlowLimitedCount    *exporter.Gauge
+	MetricRunLimitedCount     *exporter.Gauge
+	MetricLruUsageRatio       *exporter.Gauge
+	MetricDiskUsageRatio      *exporter.Gauge
 }
 
 func (f *FlashNode) registerMetrics(disks []*cachengine.Disk) {
@@ -53,6 +63,11 @@ func (f *FlashNode) registerMetrics(disks []*cachengine.Disk) {
 	f.metrics.MetricCacheBytes = exporter.NewGauge(MetricFlashNodeCacheBytes)
 	f.metrics.MetricHandleReadLatency = exporter.NewGauge(MetricFlashNodeHandleReadLatency)
 	f.metrics.MetricSourceDataLatency = exporter.NewGauge(MetricFlashNodeSourceDataLatency)
+	f.metrics.MetricHitCacheReadLatency = exporter.NewGauge(MetricFlashNodeHitCacheReadLatency)
+	f.metrics.MetricFlowLimitedCount = exporter.NewGauge(MetricFlashNodeFlowLimitedCount)
+	f.metrics.MetricRunLimitedCount = exporter.NewGauge(MetricFlashNodeRunLimitedCount)
+	f.metrics.MetricLruUsageRatio = exporter.NewGauge(MetricFlashNodeLruUsageRatio)
+	f.metrics.MetricDiskUsageRatio = exporter.NewGauge(MetricFlashNodeDiskUsageRatio)
 	for _, d := range disks {
 		cachengine.StatMap[path.Join(d.Path, cachengine.DefaultCacheDirName)] = new(cachengine.MetricStat)
 	}
@@ -90,6 +105,9 @@ func (fm *FlashNodeMetrics) doStat() {
 	fm.setHitRateMetric()
 	fm.setCacheBytesMetric()
 	fm.setLatencyMetric()
+	fm.setLimitedCountMetric()
+	fm.setLruUsageRatioMetric()
+	fm.setDiskUsageRatioMetric()
 }
 
 func (fm *FlashNodeMetrics) setReadBytesMetric() {
@@ -144,9 +162,31 @@ func (fm *FlashNodeMetrics) setCacheBytesMetric() {
 func (fm *FlashNodeMetrics) setLatencyMetric() {
 	handleReadLatency := stat.GetAvgLatencyMs("FlashNode:opCacheRead")
 	sourceDataLatency := stat.GetAvgLatencyMs("MissCacheRead:ReadFromDN")
+	hitCacheReadLatency := stat.GetAvgLatencyMs("HitCacheRead")
 
 	fm.MetricHandleReadLatency.SetWithLabels(float64(handleReadLatency), map[string]string{"cluster": fm.flashNode.clusterID, exporter.FlashNode: fm.flashNode.localAddr})
 	fm.MetricSourceDataLatency.SetWithLabels(float64(sourceDataLatency), map[string]string{"cluster": fm.flashNode.clusterID, exporter.FlashNode: fm.flashNode.localAddr})
+	fm.MetricHitCacheReadLatency.SetWithLabels(float64(hitCacheReadLatency), map[string]string{"cluster": fm.flashNode.clusterID, exporter.FlashNode: fm.flashNode.localAddr})
+}
+
+func (fm *FlashNodeMetrics) setLimitedCountMetric() {
+	flowLimitedCount := stat.GetCount("FlashNode:opCacheRead[flow limited]")
+	runLimitedCount := stat.GetCount("FlashNode:opCacheRead[run limited]")
+
+	fm.MetricFlowLimitedCount.SetWithLabels(float64(flowLimitedCount), map[string]string{"cluster": fm.flashNode.clusterID, exporter.FlashNode: fm.flashNode.localAddr})
+	fm.MetricRunLimitedCount.SetWithLabels(float64(runLimitedCount), map[string]string{"cluster": fm.flashNode.clusterID, exporter.FlashNode: fm.flashNode.localAddr})
+}
+
+func (fm *FlashNodeMetrics) setLruUsageRatioMetric() {
+	usageRatio := fm.flashNode.cacheEngine.GetLruUsageRatio()
+	fm.MetricLruUsageRatio.SetWithLabels(usageRatio, map[string]string{"cluster": fm.flashNode.clusterID, exporter.FlashNode: fm.flashNode.localAddr})
+}
+
+func (fm *FlashNodeMetrics) setDiskUsageRatioMetric() {
+	diskUsageRatioMap := fm.flashNode.cacheEngine.GetDiskUsageRatio()
+	for dataPath, usageRatio := range diskUsageRatioMap {
+		fm.MetricDiskUsageRatio.SetWithLabels(usageRatio, map[string]string{"cluster": fm.flashNode.clusterID, exporter.FlashNode: fm.flashNode.localAddr, exporter.Disk: dataPath})
+	}
 }
 
 func (fm *FlashNodeMetrics) updateReadBytesMetric(size uint64, d string) {

sdk/remotecache/client.go

@@ -651,7 +651,9 @@ func (rc *RemoteCacheClient) updateHostLatency(hosts []string) {
 				defer fg.hostLock.Unlock()
 				for _, h := range fg.Hosts {
 					if h == host {
+						if fg.hostTimeoutCount[host] <= rc.FlashNodeTimeoutCount {
 							fg.hostTimeoutCount[host]++
+						}
 						if fg.hostTimeoutCount[host] >= rc.FlashNodeTimeoutCount {
 							rc.hostLatency.Delete(host)
 						}

sdk/remotecache/flash_group.go

@@ -151,8 +151,9 @@ func (fg *FlashGroup) moveToUnknownRank(addr string, err error, timeoutCount int
 	unknowns := fg.rankedHost[UnknownZoneRank]
 	unknowns = append(unknowns, addr)
 	fg.rankedHost[UnknownZoneRank] = unknowns
+	fg.hostTimeoutCount[addr] = 0
 
-	log.LogWarnf("moveToUnknownRank: fgID(%v) host(%v) timeoutCount(%v) by err %v", fg.ID, addr, fg.hostTimeoutCount[addr], err.Error())
+	log.LogWarnf("moveToUnknownRank: fgID(%v) host(%v) timeoutCount reset to 0 by err %v", fg.ID, addr, err.Error())
 	return moved
 }
 

util/stat/statistic.go

@@ -480,3 +480,20 @@ func GetAvgLatencyMs(typeName string) float32 {
 	}
 	return float32(avgUs) / 1000
 }
+
+func GetCount(typeName string) uint32 {
+	if gSt == nil {
+		return 0
+	}
+
+	if gSt.useMutex {
+		gSt.Lock()
+		defer gSt.Unlock()
+	}
+
+	typeInfo := gSt.typeInfoMap[typeName]
+	if typeInfo == nil {
+		return 0
+	}
+	return typeInfo.allCount
+}