1// Copyright 2016 The etcd Authors 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package command 16 17import ( 18 "fmt" 19 "os" 20 "path/filepath" 21 "time" 22 23 "github.com/spf13/cobra" 24 "go.etcd.io/etcd/mvcc/backend" 25) 26 27var ( 28 defragDataDir string 29) 30 31// NewDefragCommand returns the cobra command for "Defrag". 32func NewDefragCommand() *cobra.Command { 33 cmd := &cobra.Command{ 34 Use: "defrag", 35 Short: "Defragments the storage of the etcd members with given endpoints", 36 Run: defragCommandFunc, 37 } 38 cmd.PersistentFlags().BoolVar(&epClusterEndpoints, "cluster", false, "use all endpoints from the cluster member list") 39 cmd.Flags().StringVar(&defragDataDir, "data-dir", "", "Optional. If present, defragments a data directory not in use by etcd.") 40 return cmd 41} 42 43func defragCommandFunc(cmd *cobra.Command, args []string) { 44 if len(defragDataDir) > 0 { 45 err := defragData(defragDataDir) 46 if err != nil { 47 fmt.Fprintf(os.Stderr, "Failed to defragment etcd data[%s] (%v)\n", defragDataDir, err) 48 os.Exit(ExitError) 49 } 50 return 51 } 52 53 failures := 0 54 c := mustClientFromCmd(cmd) 55 for _, ep := range endpointsFromCluster(cmd) { 56 ctx, cancel := commandCtx(cmd) 57 _, err := c.Defragment(ctx, ep) 58 cancel() 59 if err != nil { 60 fmt.Fprintf(os.Stderr, "Failed to defragment etcd member[%s] (%v)\n", ep, err) 61 failures++ 62 } else { 63 fmt.Printf("Finished defragmenting etcd member[%s]\n", ep) 64 } 65 } 66 67 if failures != 0 { 68 os.Exit(ExitError) 69 } 70} 71 72func defragData(dataDir string) error { 73 var be backend.Backend 74 75 bch := make(chan struct{}) 76 dbDir := filepath.Join(dataDir, "member", "snap", "db") 77 go func() { 78 defer close(bch) 79 be = backend.NewDefaultBackend(dbDir) 80 81 }() 82 select { 83 case <-bch: 84 case <-time.After(time.Second): 85 fmt.Fprintf(os.Stderr, "waiting for etcd to close and release its lock on %q. "+ 86 "To defrag a running etcd instance, omit --data-dir.\n", dbDir) 87 <-bch 88 } 89 return be.Defrag() 90} 91