prometheus/tsdb/wal/checkpoint_test.go

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// Copyright 2018 The Prometheus 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 wal
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"testing"
"github.com/pkg/errors"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/tsdb/fileutil"
"github.com/prometheus/prometheus/tsdb/record"
"github.com/prometheus/prometheus/util/testutil"
)
func TestLastCheckpoint(t *testing.T) {
dir, err := ioutil.TempDir("", "test_checkpoint")
testutil.Ok(t, err)
defer func() {
testutil.Ok(t, os.RemoveAll(dir))
}()
_, _, err = LastCheckpoint(dir)
testutil.Equals(t, record.ErrNotFound, err)
testutil.Ok(t, os.MkdirAll(filepath.Join(dir, "checkpoint.0000"), 0777))
s, k, err := LastCheckpoint(dir)
testutil.Ok(t, err)
testutil.Equals(t, filepath.Join(dir, "checkpoint.0000"), s)
testutil.Equals(t, 0, k)
testutil.Ok(t, os.MkdirAll(filepath.Join(dir, "checkpoint.xyz"), 0777))
s, k, err = LastCheckpoint(dir)
testutil.Ok(t, err)
testutil.Equals(t, filepath.Join(dir, "checkpoint.0000"), s)
testutil.Equals(t, 0, k)
testutil.Ok(t, os.MkdirAll(filepath.Join(dir, "checkpoint.1"), 0777))
s, k, err = LastCheckpoint(dir)
testutil.Ok(t, err)
testutil.Equals(t, filepath.Join(dir, "checkpoint.1"), s)
testutil.Equals(t, 1, k)
testutil.Ok(t, os.MkdirAll(filepath.Join(dir, "checkpoint.1000"), 0777))
s, k, err = LastCheckpoint(dir)
testutil.Ok(t, err)
testutil.Equals(t, filepath.Join(dir, "checkpoint.1000"), s)
testutil.Equals(t, 1000, k)
}
func TestDeleteCheckpoints(t *testing.T) {
dir, err := ioutil.TempDir("", "test_checkpoint")
testutil.Ok(t, err)
defer func() {
testutil.Ok(t, os.RemoveAll(dir))
}()
testutil.Ok(t, DeleteCheckpoints(dir, 0))
testutil.Ok(t, os.MkdirAll(filepath.Join(dir, "checkpoint.00"), 0777))
testutil.Ok(t, os.MkdirAll(filepath.Join(dir, "checkpoint.01"), 0777))
testutil.Ok(t, os.MkdirAll(filepath.Join(dir, "checkpoint.02"), 0777))
testutil.Ok(t, os.MkdirAll(filepath.Join(dir, "checkpoint.03"), 0777))
testutil.Ok(t, DeleteCheckpoints(dir, 2))
files, err := fileutil.ReadDir(dir)
testutil.Ok(t, err)
testutil.Equals(t, []string{"checkpoint.02", "checkpoint.03"}, files)
}
func TestCheckpoint(t *testing.T) {
for _, compress := range []bool{false, true} {
t.Run(fmt.Sprintf("compress=%t", compress), func(t *testing.T) {
dir, err := ioutil.TempDir("", "test_checkpoint")
testutil.Ok(t, err)
defer func() {
testutil.Ok(t, os.RemoveAll(dir))
}()
var enc record.Encoder
// Create a dummy segment to bump the initial number.
seg, err := CreateSegment(dir, 100)
testutil.Ok(t, err)
testutil.Ok(t, seg.Close())
// Manually create checkpoint for 99 and earlier.
w, err := New(nil, nil, filepath.Join(dir, "checkpoint.0099"), compress)
testutil.Ok(t, err)
// Add some data we expect to be around later.
err = w.Log(enc.Series([]record.RefSeries{
{Ref: 0, Labels: labels.FromStrings("a", "b", "c", "0")},
{Ref: 1, Labels: labels.FromStrings("a", "b", "c", "1")},
}, nil))
testutil.Ok(t, err)
testutil.Ok(t, w.Close())
// Start a WAL and write records to it as usual.
w, err = NewSize(nil, nil, dir, 64*1024, compress)
testutil.Ok(t, err)
var last int64
for i := 0; ; i++ {
_, n, err := w.Segments()
testutil.Ok(t, err)
if n >= 106 {
break
}
// Write some series initially.
if i == 0 {
b := enc.Series([]record.RefSeries{
{Ref: 2, Labels: labels.FromStrings("a", "b", "c", "2")},
{Ref: 3, Labels: labels.FromStrings("a", "b", "c", "3")},
{Ref: 4, Labels: labels.FromStrings("a", "b", "c", "4")},
{Ref: 5, Labels: labels.FromStrings("a", "b", "c", "5")},
}, nil)
testutil.Ok(t, w.Log(b))
}
// Write samples until the WAL has enough segments.
// Make them have drifting timestamps within a record to see that they
// get filtered properly.
b := enc.Samples([]record.RefSample{
{Ref: 0, T: last, V: float64(i)},
{Ref: 1, T: last + 10000, V: float64(i)},
{Ref: 2, T: last + 20000, V: float64(i)},
{Ref: 3, T: last + 30000, V: float64(i)},
}, nil)
testutil.Ok(t, w.Log(b))
last += 100
}
testutil.Ok(t, w.Close())
_, err = Checkpoint(w, 100, 106, func(x uint64) bool {
return x%2 == 0
}, last/2)
testutil.Ok(t, err)
testutil.Ok(t, w.Truncate(107))
testutil.Ok(t, DeleteCheckpoints(w.Dir(), 106))
// Only the new checkpoint should be left.
files, err := fileutil.ReadDir(dir)
testutil.Ok(t, err)
testutil.Equals(t, 1, len(files))
testutil.Equals(t, "checkpoint.000106", files[0])
sr, err := NewSegmentsReader(filepath.Join(dir, "checkpoint.000106"))
testutil.Ok(t, err)
defer sr.Close()
var dec record.Decoder
var series []record.RefSeries
r := NewReader(sr)
for r.Next() {
rec := r.Record()
switch dec.Type(rec) {
case record.Series:
series, err = dec.Series(rec, series)
testutil.Ok(t, err)
case record.Samples:
samples, err := dec.Samples(rec, nil)
testutil.Ok(t, err)
for _, s := range samples {
testutil.Assert(t, s.T >= last/2, "sample with wrong timestamp")
}
}
}
testutil.Ok(t, r.Err())
testutil.Equals(t, []record.RefSeries{
{Ref: 0, Labels: labels.FromStrings("a", "b", "c", "0")},
{Ref: 2, Labels: labels.FromStrings("a", "b", "c", "2")},
{Ref: 4, Labels: labels.FromStrings("a", "b", "c", "4")},
}, series)
})
}
}
func TestCheckpointNoTmpFolderAfterError(t *testing.T) {
// Create a new wal with an invalid records.
dir, err := ioutil.TempDir("", "test_checkpoint")
testutil.Ok(t, err)
defer func() {
testutil.Ok(t, os.RemoveAll(dir))
}()
w, err := NewSize(nil, nil, dir, 64*1024, false)
testutil.Ok(t, err)
testutil.Ok(t, w.Log([]byte{99}))
w.Close()
// Run the checkpoint and since the wal contains an invalid records this should return an error.
_, err = Checkpoint(w, 0, 1, nil, 0)
testutil.NotOk(t, err)
// Walk the wal dir to make sure there are no tmp folder left behind after the error.
err = filepath.Walk(w.Dir(), func(path string, info os.FileInfo, err error) error {
if err != nil {
return errors.Wrapf(err, "access err %q: %v\n", path, err)
}
if info.IsDir() && strings.HasSuffix(info.Name(), ".tmp") {
return fmt.Errorf("wal dir contains temporary folder:%s", info.Name())
}
return nil
})
testutil.Ok(t, err)
}