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Enhance picking valid xlMeta based on quorum (#6297)

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This PR borrows the idea from getFormatXLQuorum()
This commit is contained in:
Harshavardhana 2018-08-17 14:42:04 -07:00 committed by kannappanr
parent 50dec08002
commit 3de5a3157f
5 changed files with 53 additions and 20 deletions
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2
cmd/xl-v1-healing.go
View File

@ -404,7 +404,7 @@ func healObject(ctx context.Context, storageDisks []StorageAPI, bucket string, o
// Latest xlMetaV1 for reference. If a valid metadata is not
// present, it is as good as object not found.
latestMeta, pErr := pickValidXLMeta(ctx, partsMetadata, modTime)
latestMeta, pErr := pickValidXLMeta(ctx, partsMetadata, modTime, quorum)
if pErr != nil {
return result, toObjectErr(pErr, bucket, object)
}

54
cmd/xl-v1-metadata.go
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@ -18,9 +18,9 @@ package cmd
import (
"context"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"path"
"sort"
"sync"
@ -295,18 +295,52 @@ func (m xlMetaV1) ObjectToPartOffset(ctx context.Context, offset int64) (partInd
return 0, 0, InvalidRange{}
}
// pickValidXLMeta - picks one valid xlMeta content and returns from a
// slice of xlmeta content.
func pickValidXLMeta(ctx context.Context, metaArr []xlMetaV1, modTime time.Time) (xmv xlMetaV1, e error) {
// Pick latest valid metadata.
for _, meta := range metaArr {
func getXLMetaInQuorum(ctx context.Context, metaArr []xlMetaV1, modTime time.Time, quorum int) (xmv xlMetaV1, e error) {
metaHashes := make([]string, len(metaArr))
for i, meta := range metaArr {
if meta.IsValid() && meta.Stat.ModTime.Equal(modTime) {
return meta, nil
h := sha256.New()
for _, p := range meta.Parts {
h.Write([]byte(p.Name))
}
metaHashes[i] = hex.EncodeToString(h.Sum(nil))
}
}
err := fmt.Errorf("No valid xl.json present")
logger.LogIf(ctx, err)
return xmv, err
metaHashCountMap := make(map[string]int)
for _, hash := range metaHashes {
if hash == "" {
continue
}
metaHashCountMap[hash]++
}
maxHash := ""
maxCount := 0
for hash, count := range metaHashCountMap {
if count > maxCount {
maxCount = count
maxHash = hash
}
}
if maxCount < quorum {
return xlMetaV1{}, errXLReadQuorum
}
for i, hash := range metaHashes {
if hash == maxHash {
return metaArr[i], nil
}
}
return xlMetaV1{}, errXLReadQuorum
}
// pickValidXLMeta - picks one valid xlMeta content and returns from a
// slice of xlmeta content.
func pickValidXLMeta(ctx context.Context, metaArr []xlMetaV1, modTime time.Time, quorum int) (xmv xlMetaV1, e error) {
return getXLMetaInQuorum(ctx, metaArr, modTime, quorum)
}
// list of all errors that can be ignored in a metadata operation.

5
cmd/xl-v1-metadata_test.go
View File

@ -19,7 +19,6 @@ package cmd
import (
"bytes"
"context"
"errors"
"os"
"path"
"strconv"
@ -349,11 +348,11 @@ func TestPickValidXLMeta(t *testing.T) {
metaArr: invalidXS,
modTime: now,
xlMeta: invalidX1,
expectedErr: errors.New("No valid xl.json present"),
expectedErr: errXLReadQuorum,
},
}
for i, test := range testCases {
xlMeta, err := pickValidXLMeta(context.Background(), test.metaArr, test.modTime)
xlMeta, err := pickValidXLMeta(context.Background(), test.metaArr, test.modTime, len(test.metaArr)/2)
if test.expectedErr != nil {
if err.Error() != test.expectedErr.Error() {
t.Errorf("Test %d: Expected to fail with %v but received %v",

6
cmd/xl-v1-multipart.go
View File

@ -346,7 +346,7 @@ func (xl xlObjects) PutObjectPart(ctx context.Context, bucket, object, uploadID
onlineDisks, modTime := listOnlineDisks(xl.getDisks(), partsMetadata, errs)
// Pick one from the first valid metadata.
xlMeta, err := pickValidXLMeta(ctx, partsMetadata, modTime)
xlMeta, err := pickValidXLMeta(ctx, partsMetadata, modTime, writeQuorum)
if err != nil {
return pi, err
}
@ -445,7 +445,7 @@ func (xl xlObjects) PutObjectPart(ctx context.Context, bucket, object, uploadID
onlineDisks, modTime = listOnlineDisks(onlineDisks, partsMetadata, errs)
// Pick one from the first valid metadata.
xlMeta, err = pickValidXLMeta(ctx, partsMetadata, modTime)
xlMeta, err = pickValidXLMeta(ctx, partsMetadata, modTime, writeQuorum)
if err != nil {
return pi, err
}
@ -645,7 +645,7 @@ func (xl xlObjects) CompleteMultipartUpload(ctx context.Context, bucket string,
var objectSize int64
// Pick one from the first valid metadata.
xlMeta, err := pickValidXLMeta(ctx, partsMetadata, modTime)
xlMeta, err := pickValidXLMeta(ctx, partsMetadata, modTime, writeQuorum)
if err != nil {
return oi, err
}

6
cmd/xl-v1-object.go
View File

@ -102,7 +102,7 @@ func (xl xlObjects) CopyObject(ctx context.Context, srcBucket, srcObject, dstBuc
_, modTime := listOnlineDisks(storageDisks, metaArr, errs)
// Pick latest valid metadata.
xlMeta, err := pickValidXLMeta(ctx, metaArr, modTime)
xlMeta, err := pickValidXLMeta(ctx, metaArr, modTime, readQuorum)
if err != nil {
return oi, toObjectErr(err, srcBucket, srcObject)
}
@ -221,7 +221,7 @@ func (xl xlObjects) getObject(ctx context.Context, bucket, object string, startO
onlineDisks, modTime := listOnlineDisks(xl.getDisks(), metaArr, errs)
// Pick latest valid metadata.
xlMeta, err := pickValidXLMeta(ctx, metaArr, modTime)
xlMeta, err := pickValidXLMeta(ctx, metaArr, modTime, readQuorum)
if err != nil {
return err
}
@ -402,7 +402,7 @@ func (xl xlObjects) getObjectInfo(ctx context.Context, bucket, object string) (o
modTime, _ := commonTime(modTimes)
// Pick latest valid metadata.
xlMeta, err := pickValidXLMeta(ctx, metaArr, modTime)
xlMeta, err := pickValidXLMeta(ctx, metaArr, modTime, readQuorum)
if err != nil {
return objInfo, err
}