refine

Signed-off-by: wjhuang2016 <[email protected]>

Author: wjhuang2016

ddl/ddl_ops.go

@@ -561,7 +561,7 @@ func (c *testCase) execParaDDLSQL(taskCh chan *ddlJobTask, num int) error {
 						// Wait for other gorountine to update
 						globalDDLSeqNumMu.Unlock()
 						time.Sleep(5 * time.Millisecond)
-						if time.Since(startTs) >= 10*time.Second && rand.Intn(10) == 0 {
+						if time.Since(startTs) >= 10*time.Second && rand.Intn(100) == 0 {
 							log.Errorf("wait for updating seq_num timeout, seq_num:%d, globalDDLSeqNum:%d", seqNum, globalDDLSeqNum)
 						}
 					} else {

ddl/run.go

@@ -229,6 +229,7 @@ var ddlIgnoreList = []string{
 	"Unsupported",
 	"context canceled",
 	"cancelled by user",
+	"error msg: injected random error, caller: github.com/pingcap/tidb/pkg/disttask/framework/storage.(*TaskManager).WithNewSession",
 }
 
 func ddlIgnoreError(err error) bool {