| // Copyright 2016 The etcd Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package command |
| |
| import ( |
| "fmt" |
| "os" |
| "path/filepath" |
| "time" |
| |
| "github.com/coreos/etcd/mvcc/backend" |
| "github.com/spf13/cobra" |
| ) |
| |
| var ( |
| defragDataDir string |
| ) |
| |
| // NewDefragCommand returns the cobra command for "Defrag". |
| func NewDefragCommand() *cobra.Command { |
| cmd := &cobra.Command{ |
| Use: "defrag", |
| Short: "Defragments the storage of the etcd members with given endpoints", |
| Run: defragCommandFunc, |
| } |
| cmd.Flags().StringVar(&defragDataDir, "data-dir", "", "Optional. If present, defragments a data directory not in use by etcd.") |
| return cmd |
| } |
| |
| func defragCommandFunc(cmd *cobra.Command, args []string) { |
| if len(defragDataDir) > 0 { |
| err := defragData(defragDataDir) |
| if err != nil { |
| fmt.Fprintf(os.Stderr, "Failed to defragment etcd data[%s] (%v)\n", defragDataDir, err) |
| os.Exit(ExitError) |
| } |
| return |
| } |
| |
| failures := 0 |
| c := mustClientFromCmd(cmd) |
| for _, ep := range c.Endpoints() { |
| ctx, cancel := commandCtx(cmd) |
| _, err := c.Defragment(ctx, ep) |
| cancel() |
| if err != nil { |
| fmt.Fprintf(os.Stderr, "Failed to defragment etcd member[%s] (%v)\n", ep, err) |
| failures++ |
| } else { |
| fmt.Printf("Finished defragmenting etcd member[%s]\n", ep) |
| } |
| } |
| |
| if failures != 0 { |
| os.Exit(ExitError) |
| } |
| } |
| |
| func defragData(dataDir string) error { |
| var be backend.Backend |
| |
| bch := make(chan struct{}) |
| dbDir := filepath.Join(dataDir, "member", "snap", "db") |
| go func() { |
| defer close(bch) |
| be = backend.NewDefaultBackend(dbDir) |
| |
| }() |
| select { |
| case <-bch: |
| case <-time.After(time.Second): |
| fmt.Fprintf(os.Stderr, "waiting for etcd to close and release its lock on %q. "+ |
| "To defrag a running etcd instance, omit --data-dir.\n", dbDir) |
| <-bch |
| } |
| return be.Defrag() |
| } |