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package command
import ( "github.com/seaweedfs/seaweedfs/weed/glog" "github.com/seaweedfs/seaweedfs/weed/pb" "github.com/seaweedfs/seaweedfs/weed/pb/filer_pb" "github.com/seaweedfs/seaweedfs/weed/util" "sync" )
type MetadataProcessor struct { activeJobs map[int64]*filer_pb.SubscribeMetadataResponse activeJobsLock sync.Mutex activeJobsCond *sync.Cond concurrencyLimit int fn pb.ProcessMetadataFunc processedTsWatermark int64 }
func NewMetadataProcessor(fn pb.ProcessMetadataFunc, concurrency int) *MetadataProcessor { t := &MetadataProcessor{ fn: fn, activeJobs: make(map[int64]*filer_pb.SubscribeMetadataResponse), concurrencyLimit: concurrency, } t.activeJobsCond = sync.NewCond(&t.activeJobsLock) return t }
func (t *MetadataProcessor) AddSyncJob(resp *filer_pb.SubscribeMetadataResponse) { if filer_pb.IsEmpty(resp) { return }
t.activeJobsLock.Lock() defer t.activeJobsLock.Unlock()
for len(t.activeJobs) >= t.concurrencyLimit || t.conflictsWith(resp) { t.activeJobsCond.Wait() } t.activeJobs[resp.TsNs] = resp go func() {
if err := util.Retry("metadata processor", func() error { return t.fn(resp) }); err != nil { glog.Errorf("process %v: %v", resp, err) }
t.activeJobsLock.Lock() defer t.activeJobsLock.Unlock()
delete(t.activeJobs, resp.TsNs)
// if is the oldest job, write down the watermark
isOldest := true for t, _ := range t.activeJobs { if resp.TsNs > t { isOldest = false break } } if isOldest { t.processedTsWatermark = resp.TsNs } t.activeJobsCond.Signal() }() }
func (t *MetadataProcessor) conflictsWith(resp *filer_pb.SubscribeMetadataResponse) bool { for _, r := range t.activeJobs { if shouldWaitFor(resp, r) { return true } } return false }
// a is one possible job to schedule
// b is one existing active job
func shouldWaitFor(a *filer_pb.SubscribeMetadataResponse, b *filer_pb.SubscribeMetadataResponse) bool { aPath, aNewPath, aIsDirectory := extractPathsFromMetadata(a) bPath, bNewPath, bIsDirectory := extractPathsFromMetadata(b)
if pairShouldWaitFor(aPath, bPath, aIsDirectory, bIsDirectory) { return true } if aNewPath != "" { if pairShouldWaitFor(aNewPath, bPath, aIsDirectory, bIsDirectory) { return true } } if bNewPath != "" { if pairShouldWaitFor(aPath, bNewPath, aIsDirectory, bIsDirectory) { return true } } if aNewPath != "" && bNewPath != "" { if pairShouldWaitFor(aNewPath, bNewPath, aIsDirectory, bIsDirectory) { return true } } return false }
func pairShouldWaitFor(aPath, bPath util.FullPath, aIsDirectory, bIsDirectory bool) bool { if bIsDirectory { if aIsDirectory { return aPath.IsUnder(bPath) || bPath.IsUnder(aPath) } else { return aPath.IsUnder(bPath) } } else { if aIsDirectory { return bPath.IsUnder(aPath) } else { return aPath == bPath } } }
func extractPathsFromMetadata(resp *filer_pb.SubscribeMetadataResponse) (path, newPath util.FullPath, isDirectory bool) { oldEntry := resp.EventNotification.OldEntry newEntry := resp.EventNotification.NewEntry // create
if filer_pb.IsCreate(resp) { path = util.FullPath(resp.Directory).Child(newEntry.Name) isDirectory = newEntry.IsDirectory return } if filer_pb.IsDelete(resp) { path = util.FullPath(resp.Directory).Child(oldEntry.Name) isDirectory = oldEntry.IsDirectory return } if filer_pb.IsUpdate(resp) { path = util.FullPath(resp.Directory).Child(newEntry.Name) isDirectory = newEntry.IsDirectory return } // renaming
path = util.FullPath(resp.Directory).Child(oldEntry.Name) isDirectory = oldEntry.IsDirectory newPath = util.FullPath(resp.EventNotification.NewParentPath).Child(newEntry.Name) return }
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