Do not vacuum memory mapped files

weed/storage/volume_vacuum.go

@@ -8,6 +8,7 @@ import (
 	"github.com/joeslay/seaweedfs/weed/glog"
 	"github.com/joeslay/seaweedfs/weed/stats"
 	idx2 "github.com/joeslay/seaweedfs/weed/storage/idx"
+	"github.com/joeslay/seaweedfs/weed/storage/memory_map"
 	"github.com/joeslay/seaweedfs/weed/storage/needle"
 	"github.com/joeslay/seaweedfs/weed/storage/needle_map"
 	. "github.com/joeslay/seaweedfs/weed/storage/types"
@@ -22,6 +23,9 @@ func (v *Volume) garbageLevel() float64 {
 }
 
 func (v *Volume) Compact(preallocate int64, compactionBytePerSecond int64) error {
+
+	_, exists := memory_map.FileMemoryMap[v.dataFile.Name()]
+	if !exists { //it makes no sense to compact in memory
 		glog.V(3).Infof("Compacting volume %d ...", v.Id)
 		//no need to lock for copy on write
 		//v.accessLock.Lock()
@@ -37,9 +41,15 @@ func (v *Volume) Compact(preallocate int64, compactionBytePerSecond int64) error
 		v.lastCompactRevision = v.SuperBlock.CompactionRevision
 		glog.V(3).Infof("creating copies for volume %d ,last offset %d...", v.Id, v.lastCompactIndexOffset)
 		return v.copyDataAndGenerateIndexFile(filePath+".cpd", filePath+".cpx", preallocate, compactionBytePerSecond)
+	} else {
+		return nil
+	}
 }
 
 func (v *Volume) Compact2() error {
+	_, exists := memory_map.FileMemoryMap[v.dataFile.Name()]
+	if !exists { //it makes no sense to compact in memory
+
 		glog.V(3).Infof("Compact2 volume %d ...", v.Id)
 
 		v.isCompacting = true
@@ -50,9 +60,14 @@ func (v *Volume) Compact2() error {
 		filePath := v.FileName()
 		glog.V(3).Infof("creating copies for volume %d ...", v.Id)
 		return v.copyDataBasedOnIndexFile(filePath+".cpd", filePath+".cpx")
+	} else {
+		return nil
+	}
 }
 
 func (v *Volume) CommitCompact() error {
+	_, exists := memory_map.FileMemoryMap[v.dataFile.Name()]
+	if !exists { //it makes no sense to compact in memory
 		glog.V(0).Infof("Committing volume %d vacuuming...", v.Id)
 
 		v.isCompacting = true
@@ -102,6 +117,7 @@ func (v *Volume) CommitCompact() error {
 		if e = v.load(true, false, v.needleMapKind, 0); e != nil {
 			return e
 		}
+	}
 	return nil
 }