passing partition generation timestamp

weed/mq/sub_coordinator/partition_consumer_mapping.go

@@ -84,6 +84,7 @@ func doBalanceSticky(partitions []*pub_balancer.PartitionSlotToBroker, consumerI
 		newPartitionSlots = append(newPartitionSlots, &PartitionSlotToConsumerInstance{
 			RangeStart: partition.RangeStart,
 			RangeStop:  partition.RangeStop,
+			UnixTimeNs: partition.UnixTimeNs,
 			Broker:     partition.AssignedBroker,
 		})
 	}

weed/mq/sub_coordinator/partition_list.go

@@ -5,6 +5,7 @@ import "github.com/seaweedfs/seaweedfs/weed/mq/topic"
 type PartitionSlotToConsumerInstance struct {
 	RangeStart         int32
 	RangeStop          int32
+	UnixTimeNs         int64
 	Broker             string
 	AssignedInstanceId string
 }