prometheus/repair_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.
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package tsdb
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import (
"os"
"path/filepath"
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"testing"
"github.com/prometheus/tsdb/chunks"
"github.com/prometheus/tsdb/fileutil"
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"github.com/prometheus/tsdb/index"
"github.com/prometheus/tsdb/labels"
"github.com/prometheus/tsdb/testutil"
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)
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func TestRepairBadIndexVersion(t *testing.T) {
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// The broken index used in this test was written by the following script
// at a broken revision.
//
// func main() {
// w, err := index.NewWriter(indexFilename)
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// if err != nil {
// panic(err)
// }
// err = w.AddSymbols(map[string]struct{}{
// "a": struct{}{},
// "b": struct{}{},
// "1": struct{}{},
// "2": struct{}{},
// })
// if err != nil {
// panic(err)
// }
// err = w.AddSeries(1, labels.FromStrings("a", "1", "b", "1"))
// if err != nil {
// panic(err)
// }
// err = w.AddSeries(2, labels.FromStrings("a", "2", "b", "1"))
// if err != nil {
// panic(err)
// }
// err = w.WritePostings("b", "1", index.NewListPostings([]uint64{1, 2}))
// if err != nil {
// panic(err)
// }
// if err := w.Close(); err != nil {
// panic(err)
// }
// }
dbDir := filepath.Join("testdata", "repair_index_version", "01BZJ9WJQPWHGNC2W4J9TA62KC")
tmpDir := filepath.Join("testdata", "repair_index_version", "copy")
tmpDbDir := filepath.Join(tmpDir, "3MCNSQ8S31EHGJYWK5E1GPJWJZ")
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// Check the current db.
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// In its current state, lookups should fail with the fixed code.
_, err := readMetaFile(dbDir)
testutil.NotOk(t, err)
// Touch chunks dir in block.
os.MkdirAll(filepath.Join(dbDir, "chunks"), 0777)
defer os.RemoveAll(filepath.Join(dbDir, "chunks"))
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r, err := index.NewFileReader(filepath.Join(dbDir, indexFilename))
testutil.Ok(t, err)
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p, err := r.Postings("b", "1")
testutil.Ok(t, err)
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for p.Next() {
t.Logf("next ID %d", p.At())
var lset labels.Labels
testutil.NotOk(t, r.Series(p.At(), &lset, nil))
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}
testutil.Ok(t, p.Err())
testutil.Ok(t, r.Close())
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// Create a copy DB to run test against.
if err = fileutil.CopyDirs(dbDir, tmpDbDir); err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpDir)
// On DB opening all blocks in the base dir should be repaired.
db, err := Open(tmpDir, nil, nil, nil)
testutil.Ok(t, err)
db.Close()
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r, err = index.NewFileReader(filepath.Join(tmpDbDir, indexFilename))
testutil.Ok(t, err)
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p, err = r.Postings("b", "1")
testutil.Ok(t, err)
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res := []labels.Labels{}
for p.Next() {
t.Logf("next ID %d", p.At())
var lset labels.Labels
var chks []chunks.Meta
testutil.Ok(t, r.Series(p.At(), &lset, &chks))
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res = append(res, lset)
}
testutil.Ok(t, p.Err())
testutil.Equals(t, []labels.Labels{
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{{"a", "1"}, {"b", "1"}},
{{"a", "2"}, {"b", "1"}},
}, res)
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meta, err := readMetaFile(tmpDbDir)
testutil.Ok(t, err)
testutil.Assert(t, meta.Version == 1, "unexpected meta version %d", meta.Version)
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}