[Improve] improve the perf of schema and schema cache (#1033)

* [Improve] improve the perf of schema and schema cache

* [Fix] fix lint error

* [revert] revert comment format

* [revert] revert comment format

* use sync.Once instead of atomic.Uint64

* revert comment format

---------

Co-authored-by: gunli <gunli@tencent.com>

pulsar/producer_partition.go

@@ -100,29 +100,24 @@ type partitionProducer struct {
 }
 
 type schemaCache struct {
-	lock    sync.RWMutex
-	schemas map[uint64][]byte
+	schemas sync.Map
 }
 
 func newSchemaCache() *schemaCache {
-	return &schemaCache{
-		schemas: make(map[uint64][]byte),
-	}
+	return &schemaCache{}
 }
 
 func (s *schemaCache) Put(schema *SchemaInfo, schemaVersion []byte) {
-	s.lock.Lock()
-	defer s.lock.Unlock()
-
 	key := schema.hash()
-	s.schemas[key] = schemaVersion
+	s.schemas.Store(key, schemaVersion)
 }
 
 func (s *schemaCache) Get(schema *SchemaInfo) (schemaVersion []byte) {
-	s.lock.RLock()
-	defer s.lock.RUnlock()
-
-	return s.schemas[schema.hash()]
+	val, ok := s.schemas.Load(schema.hash())
+	if !ok {
+		return nil
+	}
+	return val.([]byte)
 }
 
 func newPartitionProducer(client *client, topic string, options *ProducerOptions, partitionIdx int,

pulsar/schema.go

@@ -23,6 +23,7 @@ import (
 	"fmt"
 	"hash/maphash"
 	"reflect"
+	"sync"
 	"unsafe"
 
 	log "github.com/sirupsen/logrus"
@@ -66,13 +67,19 @@ type SchemaInfo struct {
 	Schema     string
 	Type       SchemaType
 	Properties map[string]string
+	hashVal    uint64
+	hashOnce   sync.Once
 }
 
-func (s SchemaInfo) hash() uint64 {
-	h := maphash.Hash{}
-	h.SetSeed(seed)
-	h.Write([]byte(s.Schema))
-	return h.Sum64()
+func (s *SchemaInfo) hash() uint64 {
+	s.hashOnce.Do(func() {
+		h := maphash.Hash{}
+		h.SetSeed(seed)
+		h.Write([]byte(s.Schema))
+		s.hashVal = h.Sum64()
+	})
+
+	return s.hashVal
 }
 
 type Schema interface {