Use jsoniter whenever applicable instead of encoding/json (#8766)

This PR adds jsoniter package to replace encoding/json
in places where faster json unmarshal is necessary
whenever input JSON is large enough.

Some benchmarking comparison between jsoniter and enconding/json

benchmark                            old MB/s     new MB/s     speedup
BenchmarkParseUnmarshal/N10-4        110.02       331.17       3.01x
BenchmarkParseUnmarshal/N100-4       125.74       524.09       4.17x
BenchmarkParseUnmarshal/N500-4       131.68       542.60       4.12x
BenchmarkParseUnmarshal/N1000-4      133.93       514.88       3.84x
BenchmarkParseUnmarshal/N5000-4      122.10       415.36       3.40x
BenchmarkParseUnmarshal/N10000-4     132.13       403.90       3.06x

cmd/config.go

@@ -26,6 +26,7 @@ import (
 	"strings"
 	"time"
 
+	jsoniter "github.com/json-iterator/go"
 	"github.com/minio/minio/cmd/config"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/madmin"
@@ -170,6 +171,7 @@ func readServerConfig(ctx context.Context, objAPI ObjectLayer) (config.Config, e
 	}
 
 	var config = config.New()
+	var json = jsoniter.ConfigCompatibleWithStandardLibrary
 	if err = json.Unmarshal(configData, &config); err != nil {
 		return nil, err
 	}

cmd/data-usage.go

@@ -22,6 +22,7 @@ import (
 	"encoding/json"
 	"time"
 
+	jsoniter "github.com/json-iterator/go"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/hash"
 )
@@ -133,6 +134,7 @@ func loadDataUsageFromBackend(ctx context.Context, objAPI ObjectLayer) (DataUsag
 	}
 
 	var dataUsageInfo DataUsageInfo
+	var json = jsoniter.ConfigCompatibleWithStandardLibrary
 	err = json.Unmarshal(dataUsageInfoJSON.Bytes(), &dataUsageInfo)
 	if err != nil {
 		return DataUsageInfo{}, err

cmd/format-disk-cache.go

@@ -18,7 +18,6 @@ package cmd
 
 import (
 	"context"
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -29,6 +28,7 @@ import (
 	"reflect"
 	"strings"
 
+	jsoniter "github.com/json-iterator/go"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/sio"
 )
@@ -444,6 +444,7 @@ func migrateOldCache(ctx context.Context, c *diskCache) error {
 			}
 			// marshal cache metadata after adding version and stat info
 			meta := &cacheMeta{}
+			var json = jsoniter.ConfigCompatibleWithStandardLibrary
 			if err = json.Unmarshal(metaBytes, &meta); err != nil {
 				return err
 			}

cmd/fs-v1-metadata.go

@@ -90,6 +90,7 @@ func (c *FSChecksumInfoV1) UnmarshalJSON(data []byte) error {
 	}
 
 	var info checksuminfo
+	var json = jsoniter.ConfigCompatibleWithStandardLibrary
 	err := json.Unmarshal(data, &info)
 	if err != nil {
 		return err

cmd/policy.go

@@ -26,6 +26,7 @@ import (
 	"strings"
 	"sync"
 
+	jsoniter "github.com/json-iterator/go"
 	miniogopolicy "github.com/minio/minio-go/v6/pkg/policy"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/event"
@@ -275,6 +276,7 @@ func PolicyToBucketAccessPolicy(bucketPolicy *policy.Policy) (*miniogopolicy.Buc
 	}
 
 	var policyInfo miniogopolicy.BucketAccessPolicy
+	var json = jsoniter.ConfigCompatibleWithStandardLibrary
 	if err = json.Unmarshal(data, &policyInfo); err != nil {
 		// This should not happen because data is valid to JSON data.
 		return nil, err
@@ -292,6 +294,7 @@ func BucketAccessPolicyToPolicy(policyInfo *miniogopolicy.BucketAccessPolicy) (*
 	}
 
 	var bucketPolicy policy.Policy
+	var json = jsoniter.ConfigCompatibleWithStandardLibrary
 	if err = json.Unmarshal(data, &bucketPolicy); err != nil {
 		// This should not happen because data is valid to JSON data.
 		return nil, err

cmd/xl-v1-metadata.go

@@ -26,6 +26,7 @@ import (
 	"sort"
 	"time"
 
+	jsoniter "github.com/json-iterator/go"
 	xhttp "github.com/minio/minio/cmd/http"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/sync/errgroup"
@@ -77,6 +78,7 @@ func (c ChecksumInfo) MarshalJSON() ([]byte, error) {
 // UnmarshalJSON - should never be called, instead xlMetaV1UnmarshalJSON() should be used.
 func (c *ChecksumInfo) UnmarshalJSON(data []byte) error {
 	var info checksumInfoJSON
+	var json = jsoniter.ConfigCompatibleWithStandardLibrary
 	if err := json.Unmarshal(data, &info); err != nil {
 		return err
 	}

cmd/xl-v1-utils.go

@@ -18,11 +18,11 @@ package cmd
 
 import (
 	"context"
-	"encoding/json"
 	"errors"
 	"hash/crc32"
 	"path"
 
+	jsoniter "github.com/json-iterator/go"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/sync/errgroup"
 )
@@ -117,6 +117,7 @@ func hashOrder(key string, cardinality int) []int {
 
 // Constructs xlMetaV1 using `jsoniter` lib.
 func xlMetaV1UnmarshalJSON(ctx context.Context, xlMetaBuf []byte) (xlMeta xlMetaV1, err error) {
+	var json = jsoniter.ConfigCompatibleWithStandardLibrary
 	err = json.Unmarshal(xlMetaBuf, &xlMeta)
 	return xlMeta, err
 }