Pavlo Baron. Big Data and CDN
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1 Pavlo Baron Big Data and CDN
2 Pavlo Baron
3
4
5 What is Big Data
6 Big Data describes datasets that grow so large that they become awkward to work with using on-hand database management tools (Wikipedia)
7 Huh?
8 Somewhere a mosquito coughs
9 and somewhere else a data center gets flooded with data
10 Huh???
11 More than 30 billion pieces of content (web links, news stories, blog posts, notes, photo albums, etc.) get shared each month on Facebook
12 Aha
13 Twitter users are, in total, tweeting an average of 55 million tweets a day, also including links etc.
14 OMG!
15 But there is even much more: cameras, sensors, RFID, logs, geolocation, GIS and so on
16 kk
17 There are several perspectives at Big Data
18 Data storage and archiving
19 Data preparation
20 Live data provisioning
21 Data analysis / analytics
22 Real-time event and stream processing
23 Data visualization
24 Where does Big Data come from
25 Uncontrolled human activities in the world wide web, or Web 2.0 if you like
26 Huh?
27 Das Bild kann nicht angezeigt werden. Dieser Computer verfügt möglicherweise über zu wenig Arbeitsspeicher, um das Bild zu öffnen, oder das Bild ist beschädigt. Starten Sie den Computer neu, und öffnen Sie dann erneut die Datei. Wenn weiterhin das rote x angezeigt wird, müssen Sie das Bild möglicherweise löschen und dann erneut einfügen. Every human leaves a vast number of data marks on the web every day: intentionally, accidentally and unknowingly
28 Huh???
29 Intentionally: we blog, tweet, upload, flatter, link, etc
30 And: the web has become an industry of its own. With us in the thick of it
31 Accidentally: we are humans and we make mistakes
32 Unknowingly: we get tricked, misled, controlled, logged etc
33 The vast number of data marks we leave on the web every day gets copied, duplicated. Data explodes.
34 Panic!
35 Wait! There s even more!
36 Huh?
37 Data flowing on streams at a very high rate from many actors
38 Huh??
39 The amount of data flying over the air has become enormous, and it s growing unpredictably
40 Aha
41 It s not only nuclear reactors anymore having hi-tech sensors and generating tons of data
42 Aha
43 And our physically huge globe
44 has become a tiny electronic ball. It s completely wired. Data needs just seconds to circumnavigate the world
45 OMG!
46 But there s even more!
47 Huh?
48 Laws and regulations force us to store and archive all sorts of data, and it s getting more and more
49 Human knowledge grows extremely fast. It s far too gigantic for one single brain
50 Oh no
51 And there s still more!
52 Huh?
53 Big Brother Big Data. We get observed, filmed, recorded, logged, geolocated etc.
54 Panic!
55 Don t panic. Get over it. Brace yourself for the battle.
56 First of all, some major changes have happened
57 Instead of huge expensive cabinets
58 we can use lots of cheap commodity hardware
59 Physics hit the wall
60 and we need to think parallel
61 Our physically huge globe
62 s has become a tiny electronic ball. It s completely wired
63 Spontaneous requirements
64 can be covered by the fog (aka cloud)
65 And what are my weapons
66 Cut your data in smaller pieces
67 Make those pieces bitesize (manageable)
68 Bring the data closer to those who need it
69 Bring the data closer to where it s physically accessed
70 Give up relations where you don t need them
71 Give up actuality where you don t need it
72 Find optimal and effective replication mechanisms
73 Consider latency an adjustment screw if you can
74 Consider availability an adjustment screw if you can
75 Be prepared to deal with unlimited amount of data depending on the perspective
76 Know your data
77 Know your volumes
78 Know your scenarios
79 Consider it what it is: a science
80 Right tool for the job
81 kk
82 And how does this technically work
83 Live data provisioning
84 What s the problem
85 Your users are widely spread, maybe all over the world
86 And you own Big Data, which has many facets geographic, financial etc.
87 And your classic silo architecture could break under the weight of such data
88 And why would I need that
89 You start and want to be one of those. Aha, ok
90 You simply grew up to a level
91 Now you need to segment your users and thus to be faster and more reliable at locations,
92 to keep your servers free of load and thus to avoid bottle necks,
93 to cut your big data in smaller, better manageable chunks
94 What are my weapons
95 If your content is static in web terms, you are already well prepared
96 In many cases, you can make your dynamic data static (precompute content)
97 Huh?
98 Let s take a look at an online bookstore
99 Hey, the online bookstore is completely dynamic (except images) it s a shop system!
100 Really?
101 Book description page: even when you modify the prices and offer Web 2.0 features such as rating you still can pre-compute the page at some time you don t need to compute the content while the page is getting accessed
102 Browser mode: this is a classic use case for static content precomputation. There is often simply no need to navigate through dynamically built paths
103 Book search: even this ultimately dynamic sounding feature can be (partially) dedynamized. Consider the index as static content, not necessarily the data itself
104 You see: many parts of an online bookstore seem dynamic, but can be actually pre-computed and delivered as static content in web terms. It s all about the frequency of change and the big data pain
105 Owning big data doesn t necessarily mean owning 100% dynamic data in terms of web
106 Aha
107 And now distribute it with CDN content delivery network
108 Huh?
109 Akamai web traffic dominance
110 Akamai web traffic monitoring
111 Akamai EdgePlatform
112 73,000 servers 70 countries 1,000 networks 30% of world s web traffic (OMG, is the rest Google?)
113 There are several CDN providers offering (world wide) such infrastructures
114 And now let s get a little insane
115
116
117
118 Huh???
119 Yeah, something s going on behind the scenes
120 How does this technically work
121 CDN is like a deputy. You make a contract, and it takes over parts of your platform. From here, it delivers to your users the content you tell it to deliver, but being much closer to them and much more intelligent than you when it comes to managing the load
122 Huh?
123 CDN has its infrastructure including actual nodes directly at the backbones, offering web caching, server load balancing, request routing and, based upon these techniques, content delivery services
124 Aha
125 What you have seen earlier: based on the IP address of the machine (origin) which made the DNS A query, the DNS server of the CDN has each time decided to return a different IP address e.g. one from the same geographic region
126 Aha
127 What you now can expect is that the returned IP address leads you to a load balancer your gate to a whole subinfrastructure of the CDN which balances between web caches or web servers or similar
128 Aha
129 CDN uses different algorithms to decide where it routes user requests to: based upon current load, cost, location etc.
130 Aha
131 But in the end, your content gets delivered to the user. If it expires, CDN refreshes it from your servers in the background
132 Often, you have to offer the last mile the very last database access, e.g. the last item view or similar. Here, the user hits your server
133 Huh?
134 cache access A query inter-cache updates caches cache refresh caches your servers
135 kk
136 How can I benefit from this having big data
137 When you have e.g. images as your big data, you can consider this data as static and thus push down-/uploads to CDN. So, you segment your users and keep your own servers free of load. What you might lose, is consistency between segments
138 Or you pre-compute static content out of your dynamic big data a sort of snapshots, and push them to CDN. So, you keep you database servers free of load and scale only through the web servers. Complexity comes with the snapshot management
139 Or you can even push some functional parts of your platform to CDN such as searches etc. You win a lot dealing with big data, but you are more dependent from the CDN provider, and your overall architecture is weaker
140 Or if you really want to experiment, you can even try to push whole executed database queries to CDN like you would do it with memory caches. That s really cool, but even much more complex and unreliable than a clusterdistributed memory cache
141 If you use CDN to collect your new data, you might need some complex replication mechanisms
142 Anyway, with all that in mind: you can have a lot of your big data out there with CDN
143 Thank you
144
145 Most images were licensed from istockphoto.com Several images were taken from corresponding Wikipedia articles, product pages and open sources
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