diff --git a/pkg/chainsync/slashfilter/mysqldb.go b/pkg/chainsync/slashfilter/mysqldb.go
index beac8b15ae..bd4a704734 100644
--- a/pkg/chainsync/slashfilter/mysqldb.go
+++ b/pkg/chainsync/slashfilter/mysqldb.go
@@ -22,17 +22,17 @@ type MysqlSlashFilter struct {
 	_db *gorm.DB
 }
 
-//MinedBlock record mined block
+// MinedBlock record mined block
 type MinedBlock struct {
 	ParentEpoch int64  `gorm:"column:parent_epoch;type:bigint(20);NOT NULL"`
-	ParentKey   string `gorm:"column:parent_key;type:varchar(1000);NOT NULL"`
+	ParentKey   string `gorm:"column:parent_key;type:varchar(2048);NOT NULL"`
 
 	Epoch int64  `gorm:"column:epoch;type:bigint(20);NOT NULL"`
 	Miner string `gorm:"column:miner;type:varchar(256);NOT NULL"`
 	Cid   string `gorm:"column:cid;type:varchar(256);NOT NULL"`
 }
 
-//NewMysqlSlashFilter create a new slash filter base on  mysql database
+// NewMysqlSlashFilter create a new slash filter base on  mysql database
 func NewMysqlSlashFilter(cfg config.MySQLConfig) (ISlashFilter, error) {
 	db, err := gorm.Open(mysql.Open(cfg.ConnectionString))
 	if err != nil {
@@ -65,7 +65,7 @@ func NewMysqlSlashFilter(cfg config.MySQLConfig) (ISlashFilter, error) {
 	}, nil
 }
 
-//checkSameHeightFault check whether the miner mined multi block on the same height
+// checkSameHeightFault check whether the miner mined multi block on the same height
 func (f *MysqlSlashFilter) checkSameHeightFault(bh *types.BlockHeader) error {
 	var bk MinedBlock
 	err := f._db.Model(&MinedBlock{}).Take(&bk, "miner=? and epoch=?", bh.Miner.String(), bh.Height).Error
@@ -86,7 +86,7 @@ func (f *MysqlSlashFilter) checkSameHeightFault(bh *types.BlockHeader) error {
 
 }
 
-//checkSameParentFault check whether the miner mined block on the same parent
+// checkSameParentFault check whether the miner mined block on the same parent
 func (f *MysqlSlashFilter) checkSameParentFault(bh *types.BlockHeader) error {
 	var bk MinedBlock
 	err := f._db.Model(&MinedBlock{}).Take(&bk, "miner=? and parent_key=?", bh.Miner.String(), types.NewTipSetKey(bh.Parents...).String()).Error
@@ -107,7 +107,7 @@ func (f *MysqlSlashFilter) checkSameParentFault(bh *types.BlockHeader) error {
 
 }
 
-//MinedBlock check whether the block mined is slash
+// MinedBlock check whether the block mined is slash
 func (f *MysqlSlashFilter) MinedBlock(ctx context.Context, bh *types.BlockHeader, parentEpoch abi.ChainEpoch) error {
 	if err := f.checkSameHeightFault(bh); err != nil {
 		return err