Presentation on theme: "SMART network: Redundancy control through traffic deduplication Kien A. Hua, Jason Kuhns, Ning Jiang, Vaithiyanathan Sundaram* *Alphabetical order 1 Contacts."— Presentation transcript:
SMART network: Redundancy control through traffic deduplication Kien A. Hua, Jason Kuhns, Ning Jiang, Vaithiyanathan Sundaram* *Alphabetical order 1 Contacts in the order of names: Redundancy issue and it’s repercussions. – (2) Solution for the redundancy issue – SMART network (traffic deduplication) – (3,4) High level technical overview – ( 5 – 8) Demo setup and experiments – (9) Advantages and distinction from existing schemes – (10) Table of contents
Fourth user request – severe redundancy issue In the figure, we can see how requests of the “same” video stream can accumulate redundant traffic in no time. This snapshot shows the redundancy issue for just four user requests of the same video. Imagine, the same with several hundreds of thousands of redundant video streams. Every video stream is considered to be a dedicated stream. This is true even if the video streams are originated from the local CDN node (like Akamai). CDN technology improves distribution in traffic, however it doesn’t completely reduce redundancy issues. Solution: Traffic deduplication using novel SMART networks. 2 Redundancy issue explained Two users request to watch Video On Demand (Could be from YouTube or Netflix or any Video On Demand service) The third user requests the SAME video, after a small interval of time. Fourth user requests the SAME video, after a small interval of time.
How redundancy is resolved by SMART network The figure shows the same scenario of four multiple user requests, however all the user requests pass through our novel SMART network. Whenever the SMART network detects a redundant stream it merges the stream using our novel traffic deduplication technique called Redundancy Control Buffering (RCB). Once the stream is merged, the boxes in the SMART network can carefully deliver the streams to desired destinations. The figure here shows first level merging as the traffic reduction in SMART network takes place “incrementally”. SMART stands for S mall packet M erge A ble R ou T ers SMART network is a set of SMART boxes all connected in an overlay network that can co-exist with existing Internet topology. Deploying SMART network requires no replacement of current Internet topology. Each SMART box intelligently merges redundant video streams and helps resolve redundancy issues. 3
After complete redundancy reduction The figure shows the second level merging where in the SMART network sends terminate stream messages to the origin of the video stream (could be a CDN or could be a video server) and terminates the traffic in the northbound interfaces. The southbound interface will transmit a merged stream (shown in thick black). A merged stream is nothing but the Master stream intelligently replicated using internal buffer buckets in each SMART boxes such that the merged stream is routed along different paths to eventually reach the end nodes as shown. Inherent SMART scheduler tracks flow control for synchronization with multiple streaming rates. 4 SMART network takes care of the underlying TCP protocol that governs the transmission of video streams. This helps SMART network to preserve the merging even though the master stream dies. SMART network has two distinct parts. Data plane and Control plane. Data plane governs the on-demand merging at line rate. Control plane governs the network state, neighbor discovery and on- demand decision.
Inside SMART network.. As soon as the request reaches one of the SMART boxes, the data plane checks if there is a possibility for a traffic merge. It may not always be possible for a SMART box to successfully merge – wherein it just forwards it to the next hop. That’s the purpose of SMART boxes. We believe tackling a serious problem with a cheaper investment resolves the problem efficiently. That’s where the control plane comes in. The control plane messages are constantly passed between nodes to keep track of the network state, buffer state, and applies our novel cost based analysis to take best opportunistic decisions. 5 Expanded version of the SMART network Shown in grey in previous slide NOTE: In this slide, let’s consider each request “arrow” comprises of several hundreds of requests. This shows a realistic view inside our SMART network. The boxes with “borders” have merged the streams and the other boxes have just forwarded it. Every SMART box has a small buffer size. Yes! We don’t require a large buffer size to tackle traffic redundancy. That’s how SMART network is completely different from proxy buffers.
Inside SMART box.. In this slide we will define the uses and functionalities of each block within the SMART boxes. SMART scheduler: Governs the scheduling algorithm and copes up with multiple streams. Depending on whether the stream has to be merged or forwarded the SMART scheduler solves this purpose. SMART bucket processor: The block that runs our novel RCB algorithm and handles the multiple merging streams to carefully dispatch without any loss in streaming rate. SMART Rule/decision processor: SMART boxes are not sole units. They cooperate with each other with a set of defined rules. These rules are governed by control plane. 6 SMART packet mergeable buffers are the physical location where the streams are opportunistically merged in smaller chunks to reduce redundancy.
Control plane in action 7 Nodes interchange updates with another node These nodes use the control plane to talk to each other The receiving control plane processes the cost Calculates the cost and updates Rule/Decision table in the data plane for the block to take decision in case of a new video stream. NOTE: This is just one of the several different possible control plane actions shown for better understanding.
Implementation setup of SMART network SMART network can be deployed and migrated to match the needs of the underlying network. Depending on the origin of the video (could be CDN or could be Service Provider or could be a sole video server) the plugin model can help SMART network to adapt. Every mode has it’s own pros. We interoperate between different modes seamlessly to match the needs. Two variations of SMART boxes (Data Plane Nodes): Figure shows diverse options for deploying the SMART network. However, there are two versions of SMART boxes. Hardware SMART box and Software SMART box. 8 Plugin model: SMART network aims for flexibility It is designed in plug and play model (plugin model) Hardware SMART: SMART software running on top of an off-the-shelf hardware Software SMART: SMART software running on top of a virtual slice like PlanetLab.
Demo setup proposal – SMART box – We will demonstrate our novel SMART box architecture and working using an off the shelf hardware with minimal buffer space that are connected to a dedicated control plane messaging system. Also, we will demonstrate a virtualized data plane solution that runs the same data plane on top of Planetlab nodes. – Control Plane node – A full fledged CPN will be demonstrated with multiple plugin options. 9 We provide the results we achieved using our small scale initial prototype that runs on top of the Planetlab nodes. ** Fig A: This graph shows the ability of SMART network on the whole. Compared to the actual traffic show in red, with really “tiny” buffers 6 SMARTs could buffer almost 50% of the video traffic flown up to 150K time units. We obviously need more SMARTs to tackle all the traffic in Internet, but this shows how a cheap off the shelf solution can help reduce redundant traffic. Fig B: Shows a simple comparison of bandwidth usage between without and with SMART network. ** Note the results provided are taken from a smaller scale prototype compared to what we plan to demonstrate.
Advantages and summary of SMART network SMART network is novel abstraction of an overlay network that is implemented adhering to futuristic Internet model. SMART network focusses on providing a flexible abstraction to incrementally reduce redundancy due to redundant Video On Demand requests. SMART uses a novel traffic deduplication scheme called Redundancy Control Buffering to successfully merging and carefully delivering to the end node. SMART network comprises of a fast yet simple SMART box controlled by a powerful Control Plane. How is SMART network different from some of the popular existing solutions: SMART network focusses on solving the below shown problems that we believe were not completely solved by existing popular schemes. SMART does not demand replacement of any current Internet underlying topology and can in- fact improve by co-existing with existing devices. In this demo we answer some of the tricky problems we tried to solve for accomplishing SMART network: How to handle TCP?, How to flow control streaming rate? How to maintain QOS?, and much more. 10 Thanks for reading through our slides