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heal: Pick maximally occuring modTime in quorum (#17071)

This commit is contained in:
Krishnan Parthasarathi 2023-04-25 10:13:57 -07:00 committed by GitHub
parent 8fd07bcd51
commit fae9000304
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 95 additions and 92 deletions
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18
cmd/erasure-healing-common.go
View File

@ -76,10 +76,14 @@ func commonTimeAndOccurence(times []time.Time, group time.Duration) (maxTime tim
return time.Unix(0, latest).UTC(), maxima
}
// commonTime returns a maximally occurring time from a list of time.
func commonTime(modTimes []time.Time) (modTime time.Time) {
modTime, _ = commonTimeAndOccurence(modTimes, 0)
return modTime
// commonTime returns a maximally occurring time from a list of time if it
// occurs >= quorum, else return timeSentinel
func commonTime(modTimes []time.Time, quorum int) time.Time {
if modTime, count := commonTimeAndOccurence(modTimes, 0); count >= quorum {
return modTime
}
return timeSentinel
}
// Beginning of unix time is treated as sentinel value here.
@ -157,15 +161,15 @@ func listObjectDiskMtimes(partsMetadata []FileInfo) (diskMTimes []time.Time) {
// listOnlineDisks - returns
// - a slice of disks where disk having 'older' xl.meta (or nothing)
// are set to nil.
// - latest (in time) of the maximally occurring modTime(s).
func listOnlineDisks(disks []StorageAPI, partsMetadata []FileInfo, errs []error) (onlineDisks []StorageAPI, modTime time.Time) {
// - latest (in time) of the maximally occurring modTime(s), which has at least quorum occurrences.
func listOnlineDisks(disks []StorageAPI, partsMetadata []FileInfo, errs []error, quorum int) (onlineDisks []StorageAPI, modTime time.Time) {
onlineDisks = make([]StorageAPI, len(disks))
// List all the file commit ids from parts metadata.
modTimes := listObjectModtimes(partsMetadata, errs)
// Reduce list of UUIDs to a single common value.
modTime = commonTime(modTimes)
modTime = commonTime(modTimes, quorum)
// Create a new online disks slice, which have common uuid.
for index, t := range modTimes {

147
cmd/erasure-healing-common_test.go
View File

@ -52,7 +52,7 @@ func getLatestFileInfo(ctx context.Context, partsMetadata []FileInfo, defaultPar
var latestFileInfo FileInfo
// Reduce list of UUIDs to a single common value - i.e. the last updated Time
modTime := commonTime(modTimes)
modTime := commonTime(modTimes, expectedRQuorum)
if modTime.IsZero() || modTime.Equal(timeSentinel) {
return FileInfo{}, errErasureReadQuorum
@ -82,8 +82,9 @@ func getLatestFileInfo(ctx context.Context, partsMetadata []FileInfo, defaultPar
func TestCommonTime(t *testing.T) {
// List of test cases for common modTime.
testCases := []struct {
times []time.Time
time time.Time
times []time.Time
time time.Time
quorum int
}{
{
// 1. Tests common times when slice has varying time elements.
@ -97,6 +98,7 @@ func TestCommonTime(t *testing.T) {
time.Unix(0, 1).UTC(),
},
time.Unix(0, 3).UTC(),
3,
},
{
// 2. Tests common time obtained when all elements are equal.
@ -110,10 +112,11 @@ func TestCommonTime(t *testing.T) {
time.Unix(0, 3).UTC(),
},
time.Unix(0, 3).UTC(),
4,
},
{
// 3. Tests common time obtained when elements have a mixture
// of sentinel values.
// 3. Tests common time obtained when elements have a mixture of
// sentinel values and don't have read quorum on any of the values.
[]time.Time{
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
@ -126,7 +129,8 @@ func TestCommonTime(t *testing.T) {
timeSentinel,
timeSentinel,
},
time.Unix(0, 3).UTC(),
timeSentinel,
5,
},
}
@ -134,7 +138,7 @@ func TestCommonTime(t *testing.T) {
// 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)
ctime := commonTime(testCase.times, testCase.quorum)
if !testCase.time.Equal(ctime) {
t.Errorf("Test case %d, expect to pass but failed. Wanted modTime: %s, got modTime: %s\n", i+1, testCase.time, ctime)
}
@ -151,30 +155,34 @@ func TestListOnlineDisks(t *testing.T) {
if err != nil {
t.Fatalf("Prepare Erasure backend failed - %v", err)
}
setObjectLayer(obj)
defer obj.Shutdown(context.Background())
defer removeRoots(disks)
type tamperKind int
const (
noTamper tamperKind = iota
deletePart tamperKind = iota
corruptPart tamperKind = iota
noTamper tamperKind = iota
deletePart
corruptPart
)
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,
timeSentinel := time.Unix(1, 0).UTC()
threeNanoSecs := time.Unix(3, 0).UTC()
fourNanoSecs := time.Unix(4, 0).UTC()
modTimesThreeNone := make([]time.Time, 16)
modTimesThreeFour := make([]time.Time, 16)
for i := 0; i < 16; i++ {
// Have 13 good xl.meta, 12 for default parity count = 4 (EC:4) and one
// to be tampered with.
if i > 12 {
modTimesThreeFour[i] = fourNanoSecs
modTimesThreeNone[i] = timeSentinel
continue
}
modTimesThreeFour[i] = threeNanoSecs
modTimesThreeNone[i] = threeNanoSecs
}
testCases := []struct {
modTimes []time.Time
expectedTime time.Time
@ -183,10 +191,10 @@ func TestListOnlineDisks(t *testing.T) {
}{
{
modTimes: modTimesThreeFour,
expectedTime: fourNanoSecs,
expectedTime: threeNanoSecs,
errs: []error{
nil, nil, nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil, nil, nil, nil,
},
_tamperBackend: noTamper,
},
@ -195,13 +203,10 @@ func TestListOnlineDisks(t *testing.T) {
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,
nil, nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil,
// Some disks can't access xl.meta.
errFileNotFound, errDiskAccessDenied, errDiskNotFound,
},
_tamperBackend: deletePart,
},
@ -210,13 +215,10 @@ func TestListOnlineDisks(t *testing.T) {
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,
nil, nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil,
// Some disks don't have xl.meta.
errDiskNotFound, errFileNotFound, errFileNotFound,
},
_tamperBackend: corruptPart,
},
@ -296,7 +298,8 @@ func TestListOnlineDisks(t *testing.T) {
}
onlineDisks, modTime := listOnlineDisks(erasureDisks, partsMetadata, test.errs)
rQuorum := len(errs) - z.serverPools[0].sets[0].defaultParityCount
onlineDisks, modTime := listOnlineDisks(erasureDisks, partsMetadata, test.errs, rQuorum)
if !modTime.Equal(test.expectedTime) {
t.Fatalf("Expected modTime to be equal to %v but was found to be %v",
test.expectedTime, modTime)
@ -325,6 +328,7 @@ func TestListOnlineDisksSmallObjects(t *testing.T) {
if err != nil {
t.Fatalf("Prepare Erasure backend failed - %v", err)
}
setObjectLayer(obj)
defer obj.Shutdown(context.Background())
defer removeRoots(disks)
@ -337,19 +341,20 @@ func TestListOnlineDisksSmallObjects(t *testing.T) {
timeSentinel := time.Unix(1, 0).UTC()
threeNanoSecs := time.Unix(3, 0).UTC()
fourNanoSecs := time.Unix(4, 0).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,
modTimesThreeNone := make([]time.Time, 16)
modTimesThreeFour := make([]time.Time, 16)
for i := 0; i < 16; i++ {
// Have 13 good xl.meta, 12 for default parity count = 4 (EC:4) and one
// to be tampered with.
if i > 12 {
modTimesThreeFour[i] = fourNanoSecs
modTimesThreeNone[i] = timeSentinel
continue
}
modTimesThreeFour[i] = threeNanoSecs
modTimesThreeNone[i] = threeNanoSecs
}
testCases := []struct {
modTimes []time.Time
expectedTime time.Time
@ -358,10 +363,10 @@ func TestListOnlineDisksSmallObjects(t *testing.T) {
}{
{
modTimes: modTimesThreeFour,
expectedTime: fourNanoSecs,
expectedTime: threeNanoSecs,
errs: []error{
nil, nil, nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil, nil, nil, nil,
},
_tamperBackend: noTamper,
},
@ -370,13 +375,10 @@ func TestListOnlineDisksSmallObjects(t *testing.T) {
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,
nil, nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil,
// Some disks can't access xl.meta.
errFileNotFound, errDiskAccessDenied, errDiskNotFound,
},
_tamperBackend: deletePart,
},
@ -385,13 +387,10 @@ func TestListOnlineDisksSmallObjects(t *testing.T) {
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,
nil, nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil,
// Some disks don't have xl.meta.
errDiskNotFound, errFileNotFound, errFileNotFound,
},
_tamperBackend: corruptPart,
},
@ -481,7 +480,8 @@ func TestListOnlineDisksSmallObjects(t *testing.T) {
t.Fatalf("Failed to getLatestFileInfo, expected %v, got %v", errErasureReadQuorum, err)
}
onlineDisks, modTime := listOnlineDisks(erasureDisks, partsMetadata, test.errs)
rQuorum := len(errs) - z.serverPools[0].sets[0].defaultParityCount
onlineDisks, modTime := listOnlineDisks(erasureDisks, partsMetadata, test.errs, rQuorum)
if !modTime.Equal(test.expectedTime) {
t.Fatalf("Expected modTime to be equal to %v but was found to be %v",
test.expectedTime, modTime)
@ -508,6 +508,7 @@ func TestDisksWithAllParts(t *testing.T) {
if err != nil {
t.Fatalf("Prepare Erasure backend failed - %v", err)
}
setObjectLayer(obj)
defer obj.Shutdown(context.Background())
defer removeRoots(disks)
@ -547,7 +548,7 @@ func TestDisksWithAllParts(t *testing.T) {
t.Fatalf("Failed to get quorum consistent fileInfo %v", err)
}
erasureDisks, _ = listOnlineDisks(erasureDisks, partsMetadata, errs)
erasureDisks, _ = listOnlineDisks(erasureDisks, partsMetadata, errs, readQuorum)
filteredDisks, errs, _ := disksWithAllParts(ctx, erasureDisks, partsMetadata,
errs, fi, bucket, object, madmin.HealDeepScan)

2
cmd/erasure-healing.go
View File

@ -386,7 +386,7 @@ func (er *erasureObjects) healObject(ctx context.Context, bucket string, object
// List of disks having latest version of the object xl.meta
// (by modtime).
onlineDisks, modTime := listOnlineDisks(storageDisks, partsMetadata, errs)
onlineDisks, modTime := listOnlineDisks(storageDisks, partsMetadata, errs, readQuorum)
// Latest FileInfo for reference. If a valid metadata is not
// present, it is as good as object not found.

12
cmd/erasure-multipart.go
View File

@ -78,24 +78,22 @@ func (er erasureObjects) checkUploadIDExists(ctx context.Context, bucket, object
return fi, nil, err
}
quorum := readQuorum
if write {
quorum = writeQuorum
}
// List all online disks.
_, modTime := listOnlineDisks(storageDisks, partsMetadata, errs)
_, modTime := listOnlineDisks(storageDisks, partsMetadata, errs, quorum)
var quorum int
if write {
reducedErr := reduceWriteQuorumErrs(ctx, errs, objectOpIgnoredErrs, writeQuorum)
if reducedErr == errErasureWriteQuorum {
return fi, nil, reducedErr
}
quorum = writeQuorum
} else {
if reducedErr := reduceReadQuorumErrs(ctx, errs, objectOpIgnoredErrs, readQuorum); reducedErr != nil {
return fi, nil, reducedErr
}
// Pick one from the first valid metadata.
quorum = readQuorum
}
// Pick one from the first valid metadata.

8
cmd/erasure-object.go
View File

@ -107,7 +107,7 @@ func (er erasureObjects) CopyObject(ctx context.Context, srcBucket, srcObject, d
}
// List all online disks.
onlineDisks, modTime := listOnlineDisks(storageDisks, metaArr, errs)
onlineDisks, modTime := listOnlineDisks(storageDisks, metaArr, errs, readQuorum)
// Pick latest valid metadata.
fi, err := pickValidFileInfo(ctx, metaArr, modTime, readQuorum)
@ -660,7 +660,7 @@ func (er erasureObjects) getObjectFileInfo(ctx context.Context, bucket, object s
}
// List all online disks.
onlineDisks, modTime := listOnlineDisks(disks, metaArr, errs)
onlineDisks, modTime := listOnlineDisks(disks, metaArr, errs, readQuorum)
// Pick latest valid metadata.
fi, err = pickValidFileInfo(ctx, metaArr, modTime, readQuorum)
@ -1770,7 +1770,7 @@ func (er erasureObjects) PutObjectMetadata(ctx context.Context, bucket, object s
}
// List all online disks.
onlineDisks, modTime := listOnlineDisks(disks, metaArr, errs)
onlineDisks, modTime := listOnlineDisks(disks, metaArr, errs, readQuorum)
// Pick latest valid metadata.
fi, err := pickValidFileInfo(ctx, metaArr, modTime, readQuorum)
@ -1843,7 +1843,7 @@ func (er erasureObjects) PutObjectTags(ctx context.Context, bucket, object strin
}
// List all online disks.
onlineDisks, modTime := listOnlineDisks(disks, metaArr, errs)
onlineDisks, modTime := listOnlineDisks(disks, metaArr, errs, readQuorum)
// Pick latest valid metadata.
fi, err := pickValidFileInfo(ctx, metaArr, modTime, readQuorum)