ddl: skip write binlog when ddl type is update tiflash replica status (…

…pingcap#16049)

Signed-off-by: crazycs520 <[email protected]>

ddl/ddl_worker.go

@@ -493,12 +493,26 @@ func (w *worker) handleDDLJobQueue(d *ddlCtx) error {
 	}
 }
 
+func skipWriteBinlog(job *model.Job) bool {
+	switch job.Type {
+	// ActionUpdateTiFlashReplicaStatus is a TiDB internal DDL,
+	// it's used to update table's TiFlash replica available status.
+	case model.ActionUpdateTiFlashReplicaStatus:
+		return true
+	}
+
+	return false
+}
+
 func writeBinlog(binlogCli *pumpcli.PumpsClient, txn kv.Transaction, job *model.Job) {
 	if job.IsDone() || job.IsRollbackDone() ||
 		// When this column is in the "delete only" and "delete reorg" states, the binlog of "drop column" has not been written yet,
 		// but the column has been removed from the binlog of the write operation.
 		// So we add this binlog to enable downstream components to handle DML correctly in this schema state.
 		(job.Type == model.ActionDropColumn && job.SchemaState == model.StateDeleteOnly) {
+		if skipWriteBinlog(job) {
+			return
+		}
 		binloginfo.SetDDLBinlog(binlogCli, txn, job.ID, int32(job.SchemaState), job.Query)
 	}
 }