/
defrag_command.go
72 lines (65 loc) · 1.93 KB
/
defrag_command.go
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// Copyright 2021 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 etcdutl
import (
"fmt"
"os"
"time"
"github.com/spf13/cobra"
"go.etcd.io/etcd/pkg/v3/cobrautl"
"go.etcd.io/etcd/server/v3/datadir"
"go.etcd.io/etcd/server/v3/mvcc/backend"
)
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",
Run: defragCommandFunc,
}
cmd.Flags().StringVar(&defragDataDir, "data-dir", "", "Required. Defragments a data directory not in use by etcd.")
cmd.MarkFlagRequired("data-dir")
return cmd
}
func defragCommandFunc(cmd *cobra.Command, args []string) {
err := DefragData(defragDataDir)
if err != nil {
cobrautl.ExitWithError(cobrautl.ExitError,
fmt.Errorf("Failed to defragment etcd data[%s] (%v)", defragDataDir, err))
}
}
func DefragData(dataDir string) error {
var be backend.Backend
lg := GetLogger()
bch := make(chan struct{})
dbDir := datadir.ToBackendFileName(dataDir)
go func() {
defer close(bch)
cfg := backend.DefaultBackendConfig()
cfg.Logger = lg
cfg.Path = dbDir
be = backend.New(cfg)
}()
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()
}