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8b4eed29e5
It is safe to repair the unexpectedEOF error in the last wal. raft will not send out message before the entry successfully comitted into wal. Thus we can safely truncate the last entry in the wal to repair.
92 lines
1.9 KiB
Go
92 lines
1.9 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package wal
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import (
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"io"
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"io/ioutil"
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"os"
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"testing"
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"github.com/coreos/etcd/raft/raftpb"
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"github.com/coreos/etcd/wal/walpb"
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)
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func TestRepair(t *testing.T) {
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p, err := ioutil.TempDir(os.TempDir(), "waltest")
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if err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(p)
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// create WAL
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w, err := Create(p, nil)
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defer w.Close()
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if err != nil {
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t.Fatal(err)
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}
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n := 10
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for i := 1; i <= n; i++ {
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es := []raftpb.Entry{{Index: uint64(i)}}
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if err = w.Save(raftpb.HardState{}, es); err != nil {
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t.Fatal(err)
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}
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}
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w.Close()
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// break the wal.
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f, err := openLast(p)
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if err != nil {
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t.Fatal(err)
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}
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offset, err := f.Seek(-4, os.SEEK_END)
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if err != nil {
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t.Fatal(err)
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}
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err = f.Truncate(offset)
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if err != nil {
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t.Fatal(err)
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}
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// verify we have broke the wal
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w, err = Open(p, walpb.Snapshot{})
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if err != nil {
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t.Fatal(err)
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}
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_, _, _, err = w.ReadAll()
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if err != io.ErrUnexpectedEOF {
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t.Fatalf("err = %v, want %v", err, io.ErrUnexpectedEOF)
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}
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w.Close()
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// repair the wal
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ok := Repair(p)
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if !ok {
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t.Fatalf("fix = %t, want %t", ok, true)
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}
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w, err = Open(p, walpb.Snapshot{})
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if err != nil {
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t.Fatal(err)
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}
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_, _, ents, err := w.ReadAll()
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if err != nil {
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t.Fatalf("err = %v, want %v", err, nil)
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}
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if len(ents) != n-1 {
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t.Fatalf("len(ents) = %d, want %d", len(ents), n-1)
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}
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}
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