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minio/cmd/erasure-healing-common_test.go

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/*
* MinIO Cloud Storage, (C) 2016-2020 MinIO, Inc.
*
* 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 cmd
import (
"bytes"
"context"
"fmt"
"os"
"path/filepath"
"testing"
"time"
"github.com/minio/minio/pkg/madmin"
)
// validates functionality provided to find most common
// time occurrence from a list of time.
func TestCommonTime(t *testing.T) {
// List of test cases for common modTime.
testCases := []struct {
times []time.Time
time time.Time
}{
{
// 1. Tests common times when slice has varying time elements.
[]time.Time{
time.Unix(0, 1).UTC(),
time.Unix(0, 2).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 2).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 1).UTC(),
}, time.Unix(0, 3).UTC(),
},
{
// 2. Tests common time obtained when all elements are equal.
[]time.Time{
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
}, time.Unix(0, 3).UTC(),
},
{
// 3. Tests common time obtained when elements have a mixture
// of sentinel values.
[]time.Time{
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 2).UTC(),
time.Unix(0, 1).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 4).UTC(),
time.Unix(0, 3).UTC(),
timeSentinel,
timeSentinel,
timeSentinel,
}, time.Unix(0, 3).UTC(),
},
}
// Tests all the testcases, and validates them against expected
// common modtime. Tests fail if modtime does not match.
for i, testCase := range testCases {
// Obtain a common mod time from modTimes slice.
ctime, _ := commonTime(testCase.times)
if !testCase.time.Equal(ctime) {
t.Fatalf("Test case %d, expect to pass but failed. Wanted modTime: %s, got modTime: %s\n", i+1, testCase.time, ctime)
}
}
}
// TestListOnlineDisks - checks if listOnlineDisks and outDatedDisks
// are consistent with each other.
func TestListOnlineDisks(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
obj, disks, err := prepareErasure16(ctx)
if err != nil {
t.Fatalf("Prepare Erasure backend failed - %v", err)
}
defer obj.Shutdown(context.Background())
defer removeRoots(disks)
type tamperKind int
const (
noTamper tamperKind = iota
deletePart tamperKind = iota
corruptPart tamperKind = iota
)
threeNanoSecs := time.Unix(0, 3).UTC()
fourNanoSecs := time.Unix(0, 4).UTC()
modTimesThreeNone := []time.Time{
threeNanoSecs, threeNanoSecs, threeNanoSecs, threeNanoSecs,
threeNanoSecs, threeNanoSecs, threeNanoSecs,
timeSentinel, timeSentinel, timeSentinel, timeSentinel,
timeSentinel, timeSentinel, timeSentinel, timeSentinel,
timeSentinel,
}
modTimesThreeFour := []time.Time{
threeNanoSecs, threeNanoSecs, threeNanoSecs, threeNanoSecs,
threeNanoSecs, threeNanoSecs, threeNanoSecs, threeNanoSecs,
fourNanoSecs, fourNanoSecs, fourNanoSecs, fourNanoSecs,
fourNanoSecs, fourNanoSecs, fourNanoSecs, fourNanoSecs,
}
testCases := []struct {
modTimes []time.Time
expectedTime time.Time
errs []error
_tamperBackend tamperKind
}{
{
modTimes: modTimesThreeFour,
expectedTime: fourNanoSecs,
errs: []error{
nil, nil, nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil, nil, nil,
},
_tamperBackend: noTamper,
},
{
modTimes: modTimesThreeNone,
expectedTime: threeNanoSecs,
errs: []error{
// Disks that have a valid xl.meta.
nil, nil, nil, nil, nil, nil, nil,
// Majority of disks don't have xl.meta.
errFileNotFound, errFileNotFound,
errFileNotFound, errFileNotFound,
errFileNotFound, errDiskAccessDenied,
errDiskNotFound, errFileNotFound,
errFileNotFound,
},
_tamperBackend: deletePart,
},
{
modTimes: modTimesThreeNone,
expectedTime: threeNanoSecs,
errs: []error{
// Disks that have a valid xl.meta.
nil, nil, nil, nil, nil, nil, nil,
// Majority of disks don't have xl.meta.
errFileNotFound, errFileNotFound,
errFileNotFound, errFileNotFound,
errFileNotFound, errDiskAccessDenied,
errDiskNotFound, errFileNotFound,
errFileNotFound,
},
_tamperBackend: corruptPart,
},
}
bucket := "bucket"
err = obj.MakeBucketWithLocation(ctx, "bucket", BucketOptions{})
if err != nil {
t.Fatalf("Failed to make a bucket %v", err)
}
object := "object"
data := bytes.Repeat([]byte("a"), 1024)
z := obj.(*erasureZones)
erasureDisks := z.zones[0].sets[0].getDisks()
for i, test := range testCases {
_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader(data), int64(len(data)), "", ""), ObjectOptions{})
if err != nil {
t.Fatalf("Failed to putObject %v", err)
}
partsMetadata, errs := readAllFileInfo(ctx, erasureDisks, bucket, object, "")
fi, err := getLatestFileInfo(ctx, partsMetadata, errs)
if err != nil {
t.Fatalf("Failed to getLatestFileInfo %v", err)
}
for j := range partsMetadata {
if errs[j] != nil {
t.Fatalf("Test %d: expected error to be nil: %s", i+1, errs[j])
}
partsMetadata[j].ModTime = test.modTimes[j]
}
tamperedIndex := -1
switch test._tamperBackend {
case deletePart:
for index, err := range test.errs {
if err != nil {
continue
}
// Remove a part from a disk
// which has a valid xl.meta,
// and check if that disk
// appears in outDatedDisks.
tamperedIndex = index
dErr := erasureDisks[index].DeleteFile(context.Background(), bucket, pathJoin(object, fi.DataDir, "part.1"))
if dErr != nil {
t.Fatalf("Test %d: Failed to delete %s - %v", i+1,
filepath.Join(object, "part.1"), dErr)
}
break
}
case corruptPart:
for index, err := range test.errs {
if err != nil {
continue
}
// Corrupt a part from a disk
// which has a valid xl.meta,
// and check if that disk
// appears in outDatedDisks.
tamperedIndex = index
filePath := pathJoin(erasureDisks[index].String(), bucket, object, fi.DataDir, "part.1")
f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_SYNC, 0)
if err != nil {
t.Fatalf("Failed to open %s: %s\n", filePath, err)
}
f.Write([]byte("oops")) // Will cause bitrot error
f.Close()
break
}
}
onlineDisks, modTime := listOnlineDisks(erasureDisks, partsMetadata, test.errs)
if !modTime.Equal(test.expectedTime) {
t.Fatalf("Test %d: Expected modTime to be equal to %v but was found to be %v",
i+1, test.expectedTime, modTime)
}
availableDisks, newErrs := disksWithAllParts(ctx, onlineDisks, partsMetadata, test.errs, bucket, object, madmin.HealDeepScan)
test.errs = newErrs
if test._tamperBackend != noTamper {
if tamperedIndex != -1 && availableDisks[tamperedIndex] != nil {
t.Fatalf("Test %d: disk (%v) with part.1 missing is not a disk with available data",
i+1, erasureDisks[tamperedIndex])
}
}
}
}
func TestDisksWithAllParts(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
obj, disks, err := prepareErasure16(ctx)
if err != nil {
t.Fatalf("Prepare Erasure backend failed - %v", err)
}
defer obj.Shutdown(context.Background())
defer removeRoots(disks)
bucket := "bucket"
object := "object"
// make data with more than one part
partCount := 3
data := bytes.Repeat([]byte("a"), 6*1024*1024*partCount)
z := obj.(*erasureZones)
s := z.zones[0].sets[0]
erasureDisks := s.getDisks()
err = obj.MakeBucketWithLocation(ctx, "bucket", BucketOptions{})
if err != nil {
t.Fatalf("Failed to make a bucket %v", err)
}
_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader(data), int64(len(data)), "", ""), ObjectOptions{})
if err != nil {
t.Fatalf("Failed to putObject %v", err)
}
_, errs := readAllFileInfo(ctx, erasureDisks, bucket, object, "")
readQuorum := len(erasureDisks) / 2
if reducedErr := reduceReadQuorumErrs(ctx, errs, objectOpIgnoredErrs, readQuorum); reducedErr != nil {
t.Fatalf("Failed to read xl meta data %v", reducedErr)
}
// Test that all disks are returned without any failures with
// unmodified meta data
partsMetadata, errs := readAllFileInfo(ctx, erasureDisks, bucket, object, "")
if err != nil {
t.Fatalf("Failed to read xl meta data %v", err)
}
filteredDisks, errs := disksWithAllParts(ctx, erasureDisks, partsMetadata, errs, bucket, object, madmin.HealDeepScan)
if len(filteredDisks) != len(erasureDisks) {
t.Errorf("Unexpected number of disks: %d", len(filteredDisks))
}
for diskIndex, disk := range filteredDisks {
if errs[diskIndex] != nil {
t.Errorf("Unexpected error %s", errs[diskIndex])
}
if disk == nil {
t.Errorf("Disk erroneously filtered, diskIndex: %d", diskIndex)
}
}
diskFailures := make(map[int]string)
// key = disk index, value = part name with hash mismatch
diskFailures[0] = "part.1"
diskFailures[3] = "part.1"
diskFailures[15] = "part.1"
for diskIndex, partName := range diskFailures {
for i := range partsMetadata[diskIndex].Erasure.Checksums {
if fmt.Sprintf("part.%d", i+1) == partName {
filePath := pathJoin(erasureDisks[diskIndex].String(), bucket, object, partsMetadata[diskIndex].DataDir, partName)
f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_SYNC, 0)
if err != nil {
t.Fatalf("Failed to open %s: %s\n", filePath, err)
}
f.Write([]byte("oops")) // Will cause bitrot error
f.Close()
}
}
}
errs = make([]error, len(erasureDisks))
filteredDisks, errs = disksWithAllParts(ctx, erasureDisks, partsMetadata, errs, bucket, object, madmin.HealDeepScan)
if len(filteredDisks) != len(erasureDisks) {
t.Errorf("Unexpected number of disks: %d", len(filteredDisks))
}
for diskIndex, disk := range filteredDisks {
if _, ok := diskFailures[diskIndex]; ok {
if disk != nil {
t.Errorf("Disk not filtered as expected, disk: %d", diskIndex)
}
if errs[diskIndex] == nil {
t.Errorf("Expected error not received, diskIndex: %d", diskIndex)
}
} else {
if disk == nil {
t.Errorf("Disk erroneously filtered, diskIndex: %d", diskIndex)
}
if errs[diskIndex] != nil {
t.Errorf("Unexpected error, %s, diskIndex: %d", errs[diskIndex], diskIndex)
}
}
}
}