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seaweedfs/weed/command/compact.go

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package command
import (
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/storage"
"github.com/seaweedfs/seaweedfs/weed/storage/needle"
"github.com/seaweedfs/seaweedfs/weed/util"
)
func init() {
cmdCompact.Run = runCompact // break init cycle
}
var cmdCompact = &Command{
UsageLine: "compact -dir=/tmp -volumeId=234",
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Short: "run weed tool compact on volume file",
Long: `Force an compaction to remove deleted files from volume files.
The compacted .dat file is stored as .cpd file.
The compacted .idx file is stored as .cpx file.
For method=0, it compacts based on the .dat file, works if .idx file is corrupted.
For method=1, it compacts based on the .idx file, works if deletion happened but not written to .dat files.
`,
}
var (
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compactVolumePath = cmdCompact.Flag.String("dir", ".", "data directory to store files")
compactVolumeCollection = cmdCompact.Flag.String("collection", "", "volume collection name")
compactVolumeId = cmdCompact.Flag.Int("volumeId", -1, "a volume id. The volume should already exist in the dir.")
compactMethod = cmdCompact.Flag.Int("method", 0, "option to choose which compact method. use 0 (default) or 1.")
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compactVolumePreallocate = cmdCompact.Flag.Int64("preallocateMB", 0, "preallocate volume disk space")
)
func runCompact(cmd *Command, args []string) bool {
if *compactVolumeId == -1 {
return false
}
preallocate := *compactVolumePreallocate * (1 << 20)
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vid := needle.VolumeId(*compactVolumeId)
v, err := storage.NewVolume(util.ResolvePath(*compactVolumePath), util.ResolvePath(*compactVolumePath), *compactVolumeCollection, vid, storage.NeedleMapInMemory, nil, nil, preallocate, 0, 0)
if err != nil {
glog.Fatalf("Load Volume [ERROR] %s\n", err)
}
if *compactMethod == 0 {
if err = v.Compact(preallocate, 0); err != nil {
glog.Fatalf("Compact Volume [ERROR] %s\n", err)
}
} else {
if err = v.Compact2(preallocate, 0, nil); err != nil {
glog.Fatalf("Compact Volume [ERROR] %s\n", err)
}
}
return true
}