Continuous dataflows complement scientific workflows
by allowing composition of realtime data ingest and analytics
pipelines to process data streams from pervasive sensors and
“always-on” scientific instruments. Such dataflows are missioncritical
applications that cannot suffer downtime, need to operate
consistent, and are long running, but may need to be updated to
fix bug or add features. This poses the problem: How do we update
the continuous dataflow application with minimal disruption? In
this paper, we formalize different types of dataflow update models
for continuous dataflow applications, and identify the qualitative
and quantitative metrics to be considered when choosing an
update strategy. We propose five dataflow update strategies,
and analytically characterize their performance trade-offs. We
validate one of these consistent, low-latency update strategies
using the F`o" dataflow engine for an eEngineering application
from the Smart Power Grid domain, and show its
We present Service-Flow map (SFMap) framework that statistically estimates the hostname of an HTTPS server, given a pair of client and server IP addresses. We evaluate the performance of SFMap through extensive analysis using real packet traces collected from two locations with different scales. We demonstrate that SFMap establishes good estimation accuracies and outperforms a state-of-the-art approach.
OpenContrail, Real Speed: Offloading vRouterOpen-NFP
The OpenContrail project aims to produce an open-source platform that delivers high performance software-defined networking while integrating cleanly with existing networking equipment. Netronome has added support for transparent hardware acceleration of OpenContrail's vRouter dataplane using Agilio hardware. This talk discusses the architecture of the system as well as the components we hope to open up to the broader community. We will discuss how to support transparent offload in the context of a split dataplane as well as provisioning of NFP resources required to produce a performant solution.
Accelerating Networked Applications with Flexible Packet ProcessingOpen-NFP
The recent surge of network I/O performance has put enormous pressure on memory and software I/O processing subsystems for many cloud and data center applications, such as key-value stores and real-time analytics frameworks. A major reason for the high memory and processing overheads is the inefficient use of these resources by network interface cards. Offloading functionality to a programmable NIC can help, but what to offload needs to be carefully chosen.
This presentation will cover a number of reusable offloading mechanisms that can help data center software processing efficiency. It will show how to implement these mechanisms in the P4 programming language and discuss their efficiency using experiments run on the Netronome Agilio-CX NIC.
P4 for Custom Identification, Flow Tagging, Monitoring and ControlOpen-NFP
This tutorial will show the use of P4 on an Agilio CX intelligent server adapter (ISA) to enable identification and custom tagging for the rerouting of elastic traffic within a telecoms data center for virtualized compute nodes. The identification is done using real time dynamic measurements of flows on the ISA. Real time dynamic measurement of flows on the ISA is critical for cloud centric service models and service automation. Enabling applications such as security, root cause analysis, big data analytics, and traffic engineering to adjust the depth and complexity of flow monitoring could enable a new wave of sophisticated features and opportunities. The purpose of the talk is to illustrate how these types of applications would benefit from a P4 framework through utilizing P4 interfaces for advanced and customized flow measurements.
Nic Viljoen
Software Engineer
Nic Viljoen is a Software Engineer at Netronome, focusing on the enablement of real time analytics at the compute node in the data plane using intelligent server adapters. He is currently collaborating with the CORD project at ON.Lab to apply this within the context of the next generation mobile edge network (MCORD). Nic spent four years at the University of Cambridge where he received his undergraduate degree and an MEng in Information Engineering, focusing on Causality and Machine Learning.
We present Service-Flow map (SFMap) framework that statistically estimates the hostname of an HTTPS server, given a pair of client and server IP addresses. We evaluate the performance of SFMap through extensive analysis using real packet traces collected from two locations with different scales. We demonstrate that SFMap establishes good estimation accuracies and outperforms a state-of-the-art approach.
OpenContrail, Real Speed: Offloading vRouterOpen-NFP
The OpenContrail project aims to produce an open-source platform that delivers high performance software-defined networking while integrating cleanly with existing networking equipment. Netronome has added support for transparent hardware acceleration of OpenContrail's vRouter dataplane using Agilio hardware. This talk discusses the architecture of the system as well as the components we hope to open up to the broader community. We will discuss how to support transparent offload in the context of a split dataplane as well as provisioning of NFP resources required to produce a performant solution.
Accelerating Networked Applications with Flexible Packet ProcessingOpen-NFP
The recent surge of network I/O performance has put enormous pressure on memory and software I/O processing subsystems for many cloud and data center applications, such as key-value stores and real-time analytics frameworks. A major reason for the high memory and processing overheads is the inefficient use of these resources by network interface cards. Offloading functionality to a programmable NIC can help, but what to offload needs to be carefully chosen.
This presentation will cover a number of reusable offloading mechanisms that can help data center software processing efficiency. It will show how to implement these mechanisms in the P4 programming language and discuss their efficiency using experiments run on the Netronome Agilio-CX NIC.
P4 for Custom Identification, Flow Tagging, Monitoring and ControlOpen-NFP
This tutorial will show the use of P4 on an Agilio CX intelligent server adapter (ISA) to enable identification and custom tagging for the rerouting of elastic traffic within a telecoms data center for virtualized compute nodes. The identification is done using real time dynamic measurements of flows on the ISA. Real time dynamic measurement of flows on the ISA is critical for cloud centric service models and service automation. Enabling applications such as security, root cause analysis, big data analytics, and traffic engineering to adjust the depth and complexity of flow monitoring could enable a new wave of sophisticated features and opportunities. The purpose of the talk is to illustrate how these types of applications would benefit from a P4 framework through utilizing P4 interfaces for advanced and customized flow measurements.
Nic Viljoen
Software Engineer
Nic Viljoen is a Software Engineer at Netronome, focusing on the enablement of real time analytics at the compute node in the data plane using intelligent server adapters. He is currently collaborating with the CORD project at ON.Lab to apply this within the context of the next generation mobile edge network (MCORD). Nic spent four years at the University of Cambridge where he received his undergraduate degree and an MEng in Information Engineering, focusing on Causality and Machine Learning.
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This is a power point I created for the presentation of a Senior Project at school. The project was the design of a wood pedestrian bridge to connect two buildings on campus. All of the images are my own or used with permission.
I got a bit of creative inspiration from other ppt's on this site, so I thought I would give back as much as I could!
In this presentation, you'll learn how to troubleshoot bandwidth issues with NetFlow Analyzer.
Topics covered:
1. Customizing data storage
2. Customizing dashboards
3. Reporting and automation
4. Troubleshooting with forensics
5. Traffic shaping
6. Capacity planning and billing
To know more, visit www.netflowanalyzer.com
The process of streaming real-time data from a wide variety of machine data sources and entities can be very complex and unwieldy. Using an agent-based approach, Informatica has invented a new technique and open access product that makes this process much more user friendly and efficient, even when dealing with multiple environments such as Hadoop, Cassandra, Storm, Amazon Kinesis and Complex Event Processing.
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This is a power point I created for the presentation of a Senior Project at school. The project was the design of a wood pedestrian bridge to connect two buildings on campus. All of the images are my own or used with permission.
I got a bit of creative inspiration from other ppt's on this site, so I thought I would give back as much as I could!
In this presentation, you'll learn how to troubleshoot bandwidth issues with NetFlow Analyzer.
Topics covered:
1. Customizing data storage
2. Customizing dashboards
3. Reporting and automation
4. Troubleshooting with forensics
5. Traffic shaping
6. Capacity planning and billing
To know more, visit www.netflowanalyzer.com
The process of streaming real-time data from a wide variety of machine data sources and entities can be very complex and unwieldy. Using an agent-based approach, Informatica has invented a new technique and open access product that makes this process much more user friendly and efficient, even when dealing with multiple environments such as Hadoop, Cassandra, Storm, Amazon Kinesis and Complex Event Processing.
"To accelerate distributed applications and close the yawning performance gap, DARPA initiated the Fast Network Interface Cards (FastNICs) program. FastNICs seeks to improve network stack performance by a factor of 100 through the creation of clean-slate networking approaches. Enabling this significant performance gain will require a rework of the entire network stack – from the application layer through the system software layer, down to the hardware."
Learn more: https://www.darpa.mil/news-events/2019-09-26
Sign up for our insideHPC Newsletter: http://insidehpc.com/newsletter
Validation and Business Considerations for Clinical Study MigrationsPerficient, Inc.
There are a variety of essential validation and business considerations that should be evaluated when migrating clinical studies from one database to another (with or without existing data). Having a clear understanding of downstream study processes and receiving input from cross-functional teams are just some of the keys to a successful migration.
In this SlideShare we discuss several case studies that provide insight into:
The steps followed during a study migration process, from validation and business perspectives
Validation considerations for migrating into an empty database, as well as a database that already contains data
Suggested documentation for the migration process
Business continuity considerations to ensure a smooth study migration for all team members
Best practices and lessons learned
Using Spark Streaming and NiFi for the Next Generation of ETL in the EnterpriseDataWorks Summit
In recent years, big data has moved from batch processing to stream-based processing since no one wants to wait hours or days to gain insights. Dozens of stream processing frameworks exist today and the same trend that occurred in the batch-based big data processing realm has taken place in the streaming world so that nearly every streaming framework now supports higher level relational operations.
On paper, combining Apache NiFi, Kafka, and Spark Streaming provides a compelling architecture option for building your next generation ETL data pipeline in near real time. What does this look like in an enterprise production environment to deploy and operationalized?
The newer Spark Structured Streaming provides fast, scalable, fault-tolerant, end-to-end exactly-once stream processing with elegant code samples, but is that the whole story?
We discuss the drivers and expected benefits of changing the existing event processing systems. In presenting the integrated solution, we will explore the key components of using NiFi, Kafka, and Spark, then share the good, the bad, and the ugly when trying to adopt these technologies into the enterprise. This session is targeted toward architects and other senior IT staff looking to continue their adoption of open source technology and modernize ingest/ETL processing. Attendees will take away lessons learned and experience in deploying these technologies to make their journey easier.
Speaker: Andrew Psaltis, Principal Solution Engineer, Hortonworks
Event-Driven Applications Done Right - Pulsar Summit SF 2022StreamNative
Pulsar Summit San Francisco is the event dedicated to Apache Pulsar. This one-day, action-packed event will include 5 keynotes, 12 breakout sessions, and 1 amazing happy hour. Speakers are from top companies, including Google, AWS, Databricks, Onehouse, StarTree, Intel, ScyllaDB, and more! It’s the perfect opportunity to network with Pulsar thought leaders in person.
Join developers, architects, data engineers, DevOps professionals, and anyone who wants to learn about messaging and event streaming for this one-day, in-person event. Pulsar Summit San Francisco brings the Apache Pulsar Community together to share best practices and discuss the future of streaming technologies.
IBM Impact 2014 AMC-1877: IBM WebSphere MQ for z/OS: Performance & AccountingPaul Dennis
How can users get the best performance out of their IBM WebSphere MQ for z/OS queue manager and also determine who is doing what? Attendees should join this session to hear about the performance and accounting measurements that can be taken, and also how to understand them so that they can make the best use of their queue manager resources.
What's New in Syncsort's Trillium Line of Data Quality Software - TSS Enterpr...Precisely
Today, in the age of big data, data quality is more essential than ever. Whatever the size of your data – you need it to be clean, free of duplicates and ready for use.
View this customer education webinar on-demand where you will learn more about the latest improvements in the market-leading data quality solution – Syncsort’s TSS Enterprise, and how it can help you receive a quicker ROI from your Syncsort Trillium investment.
During this webinar, you will learn more about new TSS Enterprise 15.8 features such as:
• Performance improvements in Syncsort Trillium Discovery
• Syncsort’s Collibra integration for a stronger data governance capability
• Added support for Amazon EMR to Syncsort Trillium Quality for Big Data
• The NEW real-time data quality function
Don’t have TSS? View this webinar on-demand to see what you may be missing by not having market-leading data quality solutions. Whether you need to de-duplicate millions of records on Spark, want to fix data errors in real-time in your CRM or build geo-location and address verification into your web application – we’ve got what you’re looking for!
Scaling Push Messaging for Millions of Devices @NetflixC4Media
Video and slides synchronized, mp3 and slide download available at URL https://bit.ly/2oA2uI5.
Susheel Aroskar talks about Zuul Push, a scalable push notification service that handles millions of "always-on" persistent connections from all the Netflix apps running. He covers the design of the Zuul Push server and reviews the design details of the back-end message routing infrastructure that lets any Netflix microservice push notifications to any connected client. Filmed at qconnewyork.com.
Susheel Aroskar works as a software engineer on the Cloud Gateway team at Netflix, which develops and operates Zuul, an API gateway that fronts all of the Netflix cloud traffic and handles more than 100 billion requests/day. Prior to Zuul, he worked on Netflix CDN's control plane in the cloud, which is responsible for steering more than a third of all North American peak evening internet traffic.
Similar to Escience2013-Continuous Data Flow Update Strategies for Mission-Critical Applications (20)
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Enhancing Performance with Globus and the Science DMZGlobus
ESnet has led the way in helping national facilities—and many other institutions in the research community—configure Science DMZs and troubleshoot network issues to maximize data transfer performance. In this talk we will present a summary of approaches and tips for getting the most out of your network infrastructure using Globus Connect Server.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
The Metaverse and AI: how can decision-makers harness the Metaverse for their...Jen Stirrup
The Metaverse is popularized in science fiction, and now it is becoming closer to being a part of our daily lives through the use of social media and shopping companies. How can businesses survive in a world where Artificial Intelligence is becoming the present as well as the future of technology, and how does the Metaverse fit into business strategy when futurist ideas are developing into reality at accelerated rates? How do we do this when our data isn't up to scratch? How can we move towards success with our data so we are set up for the Metaverse when it arrives?
How can you help your company evolve, adapt, and succeed using Artificial Intelligence and the Metaverse to stay ahead of the competition? What are the potential issues, complications, and benefits that these technologies could bring to us and our organizations? In this session, Jen Stirrup will explain how to start thinking about these technologies as an organisation.
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdfPaige Cruz
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
Essentials of Automations: The Art of Triggers and Actions in FMESafe Software
In this second installment of our Essentials of Automations webinar series, we’ll explore the landscape of triggers and actions, guiding you through the nuances of authoring and adapting workspaces for seamless automations. Gain an understanding of the full spectrum of triggers and actions available in FME, empowering you to enhance your workspaces for efficient automation.
We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Generative AI Deep Dive: Advancing from Proof of Concept to ProductionAggregage
Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
SAP Sapphire 2024 - ASUG301 building better apps with SAP Fiori.pdfPeter Spielvogel
Building better applications for business users with SAP Fiori.
• What is SAP Fiori and why it matters to you
• How a better user experience drives measurable business benefits
• How to get started with SAP Fiori today
• How SAP Fiori elements accelerates application development
• How SAP Build Code includes SAP Fiori tools and other generative artificial intelligence capabilities
• How SAP Fiori paves the way for using AI in SAP apps
Welcome to the first live UiPath Community Day Dubai! Join us for this unique occasion to meet our local and global UiPath Community and leaders. You will get a full view of the MEA region's automation landscape and the AI Powered automation technology capabilities of UiPath. Also, hosted by our local partners Marc Ellis, you will enjoy a half-day packed with industry insights and automation peers networking.
📕 Curious on our agenda? Wait no more!
10:00 Welcome note - UiPath Community in Dubai
Lovely Sinha, UiPath Community Chapter Leader, UiPath MVPx3, Hyper-automation Consultant, First Abu Dhabi Bank
10:20 A UiPath cross-region MEA overview
Ashraf El Zarka, VP and Managing Director MEA, UiPath
10:35: Customer Success Journey
Deepthi Deepak, Head of Intelligent Automation CoE, First Abu Dhabi Bank
11:15 The UiPath approach to GenAI with our three principles: improve accuracy, supercharge productivity, and automate more
Boris Krumrey, Global VP, Automation Innovation, UiPath
12:15 To discover how Marc Ellis leverages tech-driven solutions in recruitment and managed services.
Brendan Lingam, Director of Sales and Business Development, Marc Ellis
Alt. GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using ...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...SOFTTECHHUB
The choice of an operating system plays a pivotal role in shaping our computing experience. For decades, Microsoft's Windows has dominated the market, offering a familiar and widely adopted platform for personal and professional use. However, as technological advancements continue to push the boundaries of innovation, alternative operating systems have emerged, challenging the status quo and offering users a fresh perspective on computing.
One such alternative that has garnered significant attention and acclaim is Nitrux Linux 3.5.0, a sleek, powerful, and user-friendly Linux distribution that promises to redefine the way we interact with our devices. With its focus on performance, security, and customization, Nitrux Linux presents a compelling case for those seeking to break free from the constraints of proprietary software and embrace the freedom and flexibility of open-source computing.
5. • Mission critical data flows cannot suffer downtime
– How to update continuous dataflow applications with minimal disruption ?
• Evaluating dynamic update.
– Performance impact
• Throughput , Latency
– Consistency
• Data loss
• Reproducibility
5
http://www.ipandora.net/2009/08/09/pray-steadfastly/
6. • Formalize different types of data flow
updates needs.
• Identify qualitative and quantitative
metrics to be considered when
designing update strategies
• Introduce five different data flow
strategies and analytically characterize
their performance metrics
• Implement a consistent, low latency
update strategy in Floe continuous
dataflow engine and evaluate it against
a simple update strategy for a
motivating application from Los Angeles
power grid project
http://www.flickr.com/photos/dhammakaya/7095451689/
6
7. • Continuous data flow τ(Ƿ,С) is a directed graph
– Ƿ set of processors
– С set of directed edges(channels) connecting processors
7
11. P3
P1
P5
P2
P4
P6
P2++
• Updates to one or more processors and channels
– No change in number of processors
– Channel connectivity change, Channel addition/removal
11
13. • Quantitative
–
–
–
–
Refresh latency
Lag latency
Throughput
Message loss
• Qualitative
– Consistency
– Interleaved vs Delineated
http://theculturevulture.co.uk/blog/reviews/what-happened-at-whats-next/
13
14. • Refresh latency
– Time between update start and first message from the
new workflow component
• Lag latency
– Time between update start and time at which last
message from the old work flow is emitted.
• Throughput
– Message throughput drop at update time
• Message loss
– Is there a message loss ? How many ?
14
15. • Consistency
– Does message consistently processed through a one
version of data flow ?
• Interleaved & Delineated
• Let tf be the first message processed and emitted from τs+1 and tl
be the last message processed and emitted from τs
• Delineated if tf > tl
15
17. P3
P5
P2
P4
Pause
P1
P6
• Pause input stream , terminate dataflow , deploy new data flow,
resume workflow
–
–
–
–
–
Consistent
Delineated
Lag latency = 0
Refresh latency = Deployment time + Min(wave head time)
Throughput = 0 ;starting at update start time for a duration of refresh
latency
17
18. P5
P3
Flush
Pause
P1
P2
P4
P6
• Pause input stream , flush on the fly messages (TTLold), terminate
dataflow , deploy new data flow, resume workflow
–
–
–
–
–
–
Consistent
Delineated
Refresh latency = DT + TTLold + Min(wave head time)
Lag Latency = TTLold
No Message loss
Throughput goes to 0
18
19. P3
P1
P5
P2
P4
P6
• Perform in place updates upon request
– Inconsistent
– Interleaving messages
– Low latencies (bounds are derived per update type)
19
20. P3
P5
Update current version
P1
P2
• Tags messages at the
sources
• Message versions are used
to find the correct
processor/channel/sub-graph
P4
P6
P4
– Consistent
– Interleaved
20
21. • Extension of MVC
• Message tagged with current path it took
• Dispatch messages to new version either if they processed
through new version or its processed through components
present in both new and old versions of workflow.
– Consistent
– Interleaved
21
22. • Implemented MCV in Floe[1] Continuous data flow engine.
• Compare MVC against Naïve Consistent Lossy update.
• Used Message Context as a carrier of data-flow version
Floe Message
Key
Properties<K,V>
Payload
[1] https://github.com/usc-cloud/floe
22
25. • Online updates to mission critical continuous data flows is
an important problem space.
• Formalized and analyzed
– Update models
– Evaluation metrics
– Update strategies and their trade offs
• Empirically evaluate MVC and NCL update strategies.
25
The story behind this paper is some what interesting.It was started in last winter break where I started implementing a dynamic update for out in house continious data flow engine.After the winter break is over and when I met the with Yogesh and one of my colleges in lab who maintained floe at that time. we had a disagreement regarding the consistency provided by my implementation. In this discussion we realized that there can be different dynamic update types for distributed continuous data flows with different trade offs.This paper is a result of looking in to this problem in detail.
Motivation behind the need for dynamic update for continuous data-flows.Different possible types of updates to data flowsIdentify metrics to evaluate dynamic data flow updatesIntroduce set of update strategies' which offer different performance/quality trade-offs for different update types.Present empirical evaluation results some update strategies. Finish the presentation with a conclusion.
Big data High volume , High Variety , High velocity data assets Initial efforts on batch processing systemsCyber physical systems, Sensor networks, social network streams need data stream processing systems. This is where continious data flows comes in to the picture
Power grids are transforming into smart grids. (We can see power grids are transforming in to smart girds)Smart meters allow electricity consumption events to transfer in near real timeIntelligent management Demand response optimization to predict and forecast power grid demands and allow take corrective measurements if demand > supply USC act as a micro-grid test bed to evaluate forecasting models and curtailment techniques.Process data streams from over 100 buildings /50k sensors to measure power usage/ equipment status , ambient temperature etc. Continious data flowsRead data , phrase data ,extract and validate reading ,annotate data , inserted in to RDF storage used by smart girl web portal, and also parsed data directed to analytics model which does energy forecasting. Those trigger actions.
Those work flows can’t suffer downtime.Need to update : to improve, fix issues, ex : parsing/annotating logic needs to change when sensor streams change or get updated. User need :No message loss.Ordering of new/old messagesReproducibility of data. Update should not affect the reproducibility property Some applications might accept delay as : Web portal while facility management might not. Shut down the data flow and restart views on the fly updates.
I’ll not board you by going through all the formalism and theoretical bounds. Rather I’ll try to go through examples and give an intuition which will be useful when you are reading the paper.
Continious data flow is a directed graph with processor nodes and channel edges. Processors does the data processing while channels carry data between processors connecting them
We define four types of updates that can be done in a continious data flow.
Processor update defined as update to one or more processors without changing number of processors or channels for channel connectivity.
Channel update change either number of channels in the data flow or change the connectivity.
Combination of previous update types.Update one or more processors and channelsNo change in number of processors No Change in
In Connected sub-graph update, update is done by replacing a connected sub-graph in data flow replaced by another connected subgraph.
We identify and formalize different Quantitate and qualitative metrics that can be used to evaluate different dynamic data flow updates. We define and identify RL,LL,T,ML as Quantitative metrics and Consistency , Interleaved vs Delineated as Qualitative metrics
Refresh latency : How fast we see the effect of update ? Lag Latency : How long it take to flush messages from the old work flowThroughput : is there a impact to throughputMessage loss : Does this update strategy cause
Consistency : Is data reproducible ? Delineated : Can we draw a line between new messages and old messages such that there is no old messages emitted from the system after we see the first new message
We introduce 5 different data flow update strategies that can be implemented with different trade-offs. And we analyze the evaluation metrics against
Pause the input stream , terminate the data flow immediately deploy new data flow and then resume the workflow. Consistent : We terminate the old data flow immediately upon the request and messages processing in the data flow is lost. So all the messages are processed either from old version of the dataflow or new version of the data flow. Delineated: Since we terminated the data flow with the on the fly messages. There will be no old messages emitted from the data flow after the deployment of the new data floe. Lag latency is zero since we terminate the data flow immediately after update request. Refresh latency