1
00:00:00,231 --> 00:00:02,850
So next, let's explore versioning

2
00:00:02,850 --> 00:00:04,689
in our S3 Buckets.

3
00:00:04,689 --> 00:00:07,520
So for now, we just uploaded a copy of the jpg,

4
00:00:07,520 --> 00:00:10,690
and we didn't enable versioning when we created the buckets,

5
00:00:10,690 --> 00:00:12,750
But let's go into the Properties tab,

6
00:00:12,750 --> 00:00:14,700
and the first setting into the Properties tab

7
00:00:14,700 --> 00:00:16,520
is called Bucket Versioning.

8
00:00:16,520 --> 00:00:17,810
So let's edit it,

9
00:00:17,810 --> 00:00:19,420
and move the Bucket Versioning

10
00:00:19,420 --> 00:00:22,384
from being suspended to being enabled.

11
00:00:22,384 --> 00:00:24,217
I will click on save changes,

12
00:00:24,217 --> 00:00:25,050
and here we go.

13
00:00:25,050 --> 00:00:27,680
Our bucket is now enabled for versioning.

14
00:00:27,680 --> 00:00:30,870
So let's close this and go back to our Objects.

15
00:00:30,870 --> 00:00:31,703
Great.

16
00:00:31,703 --> 00:00:33,870
So this is our first object.

17
00:00:33,870 --> 00:00:36,100
But now that we have enabled versioning,

18
00:00:36,100 --> 00:00:39,120
we have a new setting here called List Versions.

19
00:00:39,120 --> 00:00:41,570
This toggle right here, if I click on it,

20
00:00:41,570 --> 00:00:44,800
will add a column into the view of Amazon S3,

21
00:00:44,800 --> 00:00:46,506
which shows me the version ID.

22
00:00:46,506 --> 00:00:49,081
And it turns out that's for coffee.jpg,

23
00:00:49,081 --> 00:00:50,872
the version ID is null.

24
00:00:50,872 --> 00:00:53,555
That means that we have uploaded this object

25
00:00:53,555 --> 00:00:57,000
before we enabled versioning onto our bucket,

26
00:00:57,000 --> 00:00:59,140
and therefore it will not have a version ID,

27
00:00:59,140 --> 00:01:00,730
hence the term null.

28
00:01:00,730 --> 00:01:03,250
But let's try to upload a new file,

29
00:01:03,250 --> 00:01:06,260
and this time, we're going to upload the beach picture.

30
00:01:06,260 --> 00:01:07,663
So beach.jpg.

31
00:01:07,663 --> 00:01:10,523
I will scroll down and upload.

32
00:01:11,400 --> 00:01:12,850
Now that file has been uploaded,

33
00:01:12,850 --> 00:01:16,043
let's go back to our buckets and list diversions.

34
00:01:16,043 --> 00:01:17,954
Now we can find that the beach.jpg

35
00:01:17,954 --> 00:01:20,112
has a version that is a very long string.

36
00:01:20,112 --> 00:01:21,875
And so this makes sense.

37
00:01:21,875 --> 00:01:25,200
As we have uploaded a version of the file

38
00:01:25,200 --> 00:01:27,230
after enabling bucket versioning,

39
00:01:27,230 --> 00:01:30,290
it's going to be assigned a version ID.

40
00:01:30,290 --> 00:01:35,290
Okay, what about if we upload the beach.jpg file again?

41
00:01:36,280 --> 00:01:39,743
So let's upload beach.jpg, and see what happens.

42
00:01:43,440 --> 00:01:46,010
Okay, back in here, I still have two objects,

43
00:01:46,010 --> 00:01:47,604
but if I list my versions,

44
00:01:47,604 --> 00:01:50,930
now we can see that beach.jpg has two version IDs.

45
00:01:50,930 --> 00:01:53,650
This one is the one we applied from before,

46
00:01:53,650 --> 00:01:56,630
and this one is the new version ID

47
00:01:56,630 --> 00:01:58,130
we just uploaded right now.

48
00:01:58,130 --> 00:01:59,900
So as we can see thanks to versioning,

49
00:01:59,900 --> 00:02:01,780
every time we re-upload a file,

50
00:02:01,780 --> 00:02:03,755
it will keep all its previous versions,

51
00:02:03,755 --> 00:02:05,204
as well as the new version

52
00:02:05,204 --> 00:02:09,060
and assign a different version ID every single time.

53
00:02:09,060 --> 00:02:10,270
So this is cool.

54
00:02:10,270 --> 00:02:12,870
Now what happens if we upload another time

55
00:02:12,870 --> 00:02:15,160
the coffee.jpg file?

56
00:02:15,160 --> 00:02:17,793
So let's try it out. We'll upload the coffee.jpg.

57
00:02:19,240 --> 00:02:20,073
Upload.

58
00:02:21,570 --> 00:02:22,710
Great.

59
00:02:22,710 --> 00:02:25,100
Back in here, list versions.

60
00:02:25,100 --> 00:02:27,420
We can see that coffee.jpg has two versions.

61
00:02:27,420 --> 00:02:28,920
The first version that we just uploaded

62
00:02:28,920 --> 00:02:30,470
has a long version ID,

63
00:02:30,470 --> 00:02:34,040
and the one from before has the version ID null.

64
00:02:34,040 --> 00:02:35,039
Okay, this is great.

65
00:02:35,039 --> 00:02:38,990
Now let's try to unlist the object version.

66
00:02:38,990 --> 00:02:41,400
So we just have these two files right here,

67
00:02:41,400 --> 00:02:43,927
and let's try to delete a file.

68
00:02:43,927 --> 00:02:47,330
So for example, let's take the beach.jpg,

69
00:02:47,330 --> 00:02:48,530
and let's try to delete it.

70
00:02:48,530 --> 00:02:49,580
So I click on Delete,

71
00:02:50,450 --> 00:02:52,290
and as you can see, we get an information

72
00:02:52,290 --> 00:02:54,560
saying deleting the specified objects

73
00:02:54,560 --> 00:02:56,930
adds delete markers to them.

74
00:02:56,930 --> 00:02:58,890
So we're actually not deleting the file itself,

75
00:02:58,890 --> 00:03:00,040
we're adding a delete marker.

76
00:03:00,040 --> 00:03:01,580
Let's see whether it's been so.

77
00:03:01,580 --> 00:03:06,520
Let's confirm we want to delete beach.jpg, and press Delete.

78
00:03:06,520 --> 00:03:09,130
Okay, so this is done.

79
00:03:09,130 --> 00:03:11,420
The object has been successfully deleted.

80
00:03:11,420 --> 00:03:12,850
Let's exit this.

81
00:03:12,850 --> 00:03:16,950
Scroll down, and yes, it seems that's my beach.jpg

82
00:03:16,950 --> 00:03:18,207
has been deleted.

83
00:03:18,207 --> 00:03:21,740
But actually, if I click on list versions,

84
00:03:21,740 --> 00:03:23,380
this toggle again,

85
00:03:23,380 --> 00:03:25,640
well, we can see that beach.jpg is still here.

86
00:03:25,640 --> 00:03:28,570
But now, on top of the two previous versions

87
00:03:28,570 --> 00:03:29,700
we have uploaded,

88
00:03:29,700 --> 00:03:31,340
we have a delete marker.

89
00:03:31,340 --> 00:03:33,690
And this delete marker has its own version ID

90
00:03:33,690 --> 00:03:36,860
of size zero bytes, and is same to AWS,

91
00:03:36,860 --> 00:03:38,842
make it seem like this file is gone,

92
00:03:38,842 --> 00:03:41,030
but actually, it's not gone,

93
00:03:41,030 --> 00:03:43,540
it just has a delete marker.

94
00:03:43,540 --> 00:03:46,600
And so how can I restore a file?

95
00:03:46,600 --> 00:03:51,470
Well, I can just take this and delete the Delete marker.

96
00:03:51,470 --> 00:03:53,210
Now, deleting a delete marker

97
00:03:53,210 --> 00:03:55,310
or deleting a specific version ID

98
00:03:55,310 --> 00:03:57,360
is called a permanent delete.

99
00:03:57,360 --> 00:04:00,360
So if I take, for example, these two files right here,

100
00:04:00,360 --> 00:04:01,330
these two versions,

101
00:04:01,330 --> 00:04:03,100
the Delete marker and the previous version

102
00:04:03,100 --> 00:04:06,328
because I want to delete two at once, I click on delete.

103
00:04:06,328 --> 00:04:08,230
Now, instead of just saying delete,

104
00:04:08,230 --> 00:04:10,250
it says you need to permanently delete

105
00:04:10,250 --> 00:04:12,700
because I'm deleting specific version ID,

106
00:04:12,700 --> 00:04:14,860
so it is a destructive operation

107
00:04:14,860 --> 00:04:16,329
before it edited delete marker,

108
00:04:16,329 --> 00:04:19,620
but not we're actually deleting the objects for good.

109
00:04:19,620 --> 00:04:21,899
So this cannot be undone.

110
00:04:21,899 --> 00:04:23,610
I click on Delete objects,

111
00:04:23,610 --> 00:04:25,660
and my objects have been deleted.

112
00:04:25,660 --> 00:04:30,660
Going back into my bucket one more time, what do we see?

113
00:04:30,770 --> 00:04:33,170
We see my beach and my coffee.jpgs are back.

114
00:04:33,170 --> 00:04:34,190
And if I list versions,

115
00:04:34,190 --> 00:04:37,020
I only have one version for my beach.jpg, which makes sense.

116
00:04:37,020 --> 00:04:40,600
this is exactly in line with the operation we just did.

117
00:04:40,600 --> 00:04:44,540
Okay. And so this allows us to roll back

118
00:04:44,540 --> 00:04:46,723
a previous version and restore a previous version,

119
00:04:47,910 --> 00:04:49,280
thanks to the versioning.

120
00:04:49,280 --> 00:04:50,880
Okay. And this is quite cool

121
00:04:50,880 --> 00:04:53,800
because, well if someone goes and deletes a file,

122
00:04:53,800 --> 00:04:54,870
and we have enabled versioning

123
00:04:54,870 --> 00:04:57,480
as long as it deletes a specific object version,

124
00:04:57,480 --> 00:05:01,000
we have prevented against unintended delete.

125
00:05:01,000 --> 00:05:03,540
And finally, for Bucket Versioning,

126
00:05:03,540 --> 00:05:04,740
you could go and disable it,

127
00:05:04,740 --> 00:05:06,560
it is not suspend it.

128
00:05:06,560 --> 00:05:08,120
So if you do suspend it,

129
00:05:08,120 --> 00:05:09,733
this is going to keep all the previous versions

130
00:05:09,733 --> 00:05:11,200
that you had from before,

131
00:05:11,200 --> 00:05:12,210
but for the new objects,

132
00:05:12,210 --> 00:05:14,920
they will have in version ID of null

133
00:05:14,920 --> 00:05:17,810
and we will replace all the existing previous versions.

134
00:05:17,810 --> 00:05:21,123
Okay. Now I'm going to keep Bucket Versioning on

135
00:05:21,123 --> 00:05:24,090
because I need it for the rest of my demos.

136
00:05:24,090 --> 00:05:25,850
So that's it for this part,

137
00:05:25,850 --> 00:05:28,800
I hope you liked it and I will see you in the next lecture.