Optimize sync implement for performace

plugin/consensus/para/para.go

@@ -5,16 +5,16 @@
 package para
 
 import (
-	"encoding/hex"
 	"fmt"
 	"sync"
+	"time"
+
+	"encoding/hex"
 
 	log "github.com/33cn/chain33/common/log/log15"
 
 	"sync/atomic"
 
-	"time"
-
 	"github.com/33cn/chain33/client/api"
 	"github.com/33cn/chain33/common/crypto"
 	"github.com/33cn/chain33/common/merkle"
@@ -212,6 +212,7 @@ func (client *client) CheckBlock(parent *types.Block, current *types.BlockDetail
 func (client *client) Close() {
 	client.BaseClient.Close()
 	close(client.commitMsgClient.quit)
+	close(client.blockSyncClient.quitChan)
 	close(client.quitCreate)
 	close(client.blockSyncClient.quitChan)
 	client.wg.Wait()