Feed at LinkedIn (Quora Talk)
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The document provides an overview of LinkedIn's Feed and FollowFeed systems. It discusses how the Feed aggregates updates from a user's network and recommendations. It then describes how the Activity Store stores social content and how FollowFeed uses an embedded index to retrieve and rank recent activities from a user's network. It concludes with an operational overview of how FollowFeed is deployed and managed at LinkedIn.
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PAPIs LATAM 2019 - Training and deploying ML models with Kubeflow and TensorF...
For real-world ML systems, it is crucial to have scalable and flexible platforms to build ML workflows. In this workshop, we will demonstrate how to build an ML DevOps pipeline using Kubeflow and TensorFlow Extended (TFX). Kubeflow is a flexible environment to implement ML workflows on top of Kubernetes - an open-source platform for managing containerized workloads and services, which can be deployed either on-premises or on a Cloud platform. TFX has a special integration with Kubeflow and provides tools for data pre-processing, model training, evaluation, deployment, and monitoring.
In this workshop, we will demonstrate a pipeline for training and deploying an RNN-based Recommender System model using Kubeflow.
https://papislatam2019.sched.com/event/OV1M/training-and-deploying-ml-models-with-kubeflow-and-tensorflow-extended-tfx-sponsored-by-cit
PAPIs LATAM 2019 - Training and deploying ML models with Kubeflow and TensorF...
Talk presented at PAPIs LATAM 2019 by Gabriel Moreira, Rodrigo Pereira and Fabio Uechi, from CI&T
Summary:
For real-world ML systems, it is crucial to have scalable and flexible platforms to build ML workflows. In this workshop, we will demonstrate how to build an ML DevOps pipeline using Kubeflow and TensorFlow Extended (TFX). Kubeflow is a flexible environment to implement ML workflows on top of Kubernetes - an open-source platform for managing containerized workloads and services, which can be deployed either on-premises or on a Cloud platform. TFX has a special integration with Kubeflow and provides tools for data pre-processing, model training, evaluation, deployment, and monitoring. In our workshop, we will demonstrate a pipeline for training and deploying an RNN-based Recommender System model using Kubeflow.
Considerations for Abstracting Complexities of a Real-Time ML Platform, Zhenz...
Considerations for Abstracting Complexities of a Real-Time ML Platform, Zhenzhong XU | Current 2022
If you are a data scientist or a platform engineer, you probably can relate to the pains of working with the current explosive growth of Data/ML technologies and toolings. With many overlapping options and steep learning curves for each, it’s increasingly challenging for data science teams. Many platform teams started thinking about building an abstracted ML platform layer to support generalized ML use cases. But there are many complexities involved, especially as the underlying real-time data is shifting into the mainstream.
In this talk, we’ll discuss why ML platforms can benefit from a simple and ""invisible"" abstraction. We’ll offer some evidence on why you should consider leveraging streaming technologies even if your use cases are not real-time yet. We’ll share learnings (combining both ML and Infra perspectives) about some of the hard complexities involved in building such simple abstractions, the design principles behind them, and some counterintuitive decisions you may come across along the way.
By the end of the talk, I hope data scientists can walk away with some tips on how to evaluate ML platforms, and platform engineers learned a few architectural and design tricks.
Learning to Rank in Solr: Presented by Michael Nilsson & Diego Ceccarelli, Bl...
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Video and slides synchronized, mp3 and slide download available at URL https://bit.ly/2O7BN8T.
Michael Bryzek highlights specific key decisions that very directly impact the quality and maintainability of a microservice architecture, covering infrastructure, continuous deployment, communication, event streaming, language choice and more, all to ensure that teams and systems remain productive and scale. Filmed at qconnewyork.com.
Michael Bryzek is the CTO and co-founder of Flow Commerce, an enterprise SAAS platform that is the world’s most advanced solution for global ecommerce. Prior, he was the cofounder and CTO of Gilt Groupe, an innovative online shopping destination offering.
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Fact Store at Scale for Netflix Recommendations
As a data driven company, we use Machine Learning algos and A/B tests to drive all of the content recommendations for our members. To improve the quality of our personalized recommendations, we try an idea offline using historical data. Ideas that improve our offline metrics are then pushed as A/B tests which are measured through statistically significant improvements in core metrics such as member engagement, satisfaction, and retention.The heart of such offline analyses are historical facts data that are used to generate features required by the machine learning model. For example, viewing history of a member, videos in mylist etc.
Building a fact store at an ever evolving Netflix scale is non trivial. Ensuring we capture enough fact data to cover all stratification needs of various experiments and guarantee that the data we serve is temporally accurate is an important requirement. In this talk, we will present the key requirements, evolution of our fact store design, its implementation, the scale and our learnings.
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Fact Store at Scale for Netflix Recommendations with Nitin Sharma and Kedar S...
As a data driven company, we use Machine Learning algos and A/B tests to drive all of the content recommendations for our members. To improve the quality of our personalized recommendations, we try an idea offline using historical data. Ideas that improve our offline metrics are then pushed as A/B tests which are measured through statistically significant improvements in core metrics such as member engagement, satisfaction, and retention.The heart of such offline analyses are historical facts data that are used to generate features required by the machine learning model. For example, viewing history of a member, videos in mylist etc.
Building a fact store at an ever evolving Netflix scale is non trivial. Ensuring we capture enough fact data to cover all stratification needs of various experiments and guarantee that the data we serve is temporally accurate is an important requirement. In this talk, we will present the key requirements, evolution of our fact store design, its implementation, the scale and our learnings.
We will also take a deep dive into fact vs feature logging, design tradeoffs, infrastructure performance, reliability and query API for the store. We use Spark and Scala extensively and variety of compression techniques to store/retrieve data efficiently.
Virtual Flink Forward 2020: Machine learning with Flink in Weibo - Yu Qian
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Building a Graph Database in Neo4j with Spark & Spark SQL to gain new insight...
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PAPIs LATAM 2019 - Training and deploying ML models with Kubeflow and TensorF...
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一比一原版(IIT毕业证)伊利诺伊理工大学毕业证成绩单专业办理
IIT毕业证原版定制【微信：176555708】【伊利诺伊理工大学毕业证成绩单-学位证】【微信：176555708】（留信学历认证永久存档查询）采用学校原版纸张、特殊工艺完全按照原版一比一制作（包括：隐形水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠，文字图案浮雕，激光镭射，紫外荧光，温感，复印防伪）行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备，十五年致力于帮助留学生解决难题，业务范围有加拿大、英国、澳洲、韩国、美国、新加坡，新西兰等学历材料，包您满意。
◆◆◆◆◆ — — — — — — — — 【留学教育】留学归国服务中心 — — — — — -◆◆◆◆◆
【主营项目】
一.毕业证【微信：176555708】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【微信：176555708】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分→ 【关于价格问题（保证一手价格）
我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子 我给客户的都是第一手的代理价格，因为我想坦诚对待大家 不想跟大家在价格方面浪费时间
对于老客户或者被老客户介绍过来的朋友，我们都会适当给一些优惠。
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
选择实体注册公司办理，更放心，更安全！我们的承诺：可来公司面谈，可签订合同，会陪同客户一起到教育部认证窗口递交认证材料，客户在教育部官方认证查询网站查询到认证通过结果后付款，不成功不收费！
学历顾问：微信：176555708
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdf
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
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一比一原版(SFU毕业证)西蒙菲莎大学毕业证成绩单如何办理
SFU毕业证原版定制【微信：176555708】【西蒙菲莎大学毕业证成绩单-学位证】【微信：176555708】（留信学历认证永久存档查询）采用学校原版纸张、特殊工艺完全按照原版一比一制作（包括：隐形水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠，文字图案浮雕，激光镭射，紫外荧光，温感，复印防伪）行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备，十五年致力于帮助留学生解决难题，业务范围有加拿大、英国、澳洲、韩国、美国、新加坡，新西兰等学历材料，包您满意。
◆◆◆◆◆ — — — — — — — — 【留学教育】留学归国服务中心 — — — — — -◆◆◆◆◆
【主营项目】
一.毕业证【微信：176555708】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【微信：176555708】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分→ 【关于价格问题（保证一手价格）
我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子 我给客户的都是第一手的代理价格，因为我想坦诚对待大家 不想跟大家在价格方面浪费时间
对于老客户或者被老客户介绍过来的朋友，我们都会适当给一些优惠。
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
选择实体注册公司办理，更放心，更安全！我们的承诺：可来公司面谈，可签订合同，会陪同客户一起到教育部认证窗口递交认证材料，客户在教育部官方认证查询网站查询到认证通过结果后付款，不成功不收费！
学历顾问：微信：176555708
An Approach to Detecting Writing Styles Based on Clustering Techniques
An Approach to Detecting Writing Styles Based on Clustering Techniques
Authors:
-Devkinandan Jagtap
-Shweta Ambekar
-Harshit Singh
-Nakul Sharma (Assistant Professor)
Institution:
VIIT Pune, India
Abstract:
This paper proposes a system to differentiate between human-generated and AI-generated texts using stylometric analysis. The system analyzes text files and classifies writing styles by employing various clustering algorithms, such as k-means, k-means++, hierarchical, and DBSCAN. The effectiveness of these algorithms is measured using silhouette scores. The system successfully identifies distinct writing styles within documents, demonstrating its potential for plagiarism detection.
Introduction:
Stylometry, the study of linguistic and structural features in texts, is used for tasks like plagiarism detection, genre separation, and author verification. This paper leverages stylometric analysis to identify different writing styles and improve plagiarism detection methods.
Methodology:
The system includes data collection, preprocessing, feature extraction, dimensional reduction, machine learning models for clustering, and performance comparison using silhouette scores. Feature extraction focuses on lexical features, vocabulary richness, and readability scores. The study uses a small dataset of texts from various authors and employs algorithms like k-means, k-means++, hierarchical clustering, and DBSCAN for clustering.
Results:
Experiments show that the system effectively identifies writing styles, with silhouette scores indicating reasonable to strong clustering when k=2. As the number of clusters increases, the silhouette scores decrease, indicating a drop in accuracy. K-means and k-means++ perform similarly, while hierarchical clustering is less optimized.
Conclusion and Future Work:
The system works well for distinguishing writing styles with two clusters but becomes less accurate as the number of clusters increases. Future research could focus on adding more parameters and optimizing the methodology to improve accuracy with higher cluster values. This system can enhance existing plagiarism detection tools, especially in academic settings.
Building Electrical System Design & Installation
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Nuclear Power Economics and Structuring 2024
Title: Nuclear Power Economics and Structuring - 2024 Edition
Produced by: World Nuclear Association Published: April 2024
Report No. 2024/001
© 2024 World Nuclear Association.
Registered in England and Wales, company number 01215741
This report reflects the views
of industry experts but does not
necessarily represent those
of World Nuclear Association’s
individual member organizations.
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Recycled Concrete Aggregate in Construction Part III
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
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一比一原版(Otago毕业证)奥塔哥大学毕业证成绩单如何办理
Otago毕业证原版定制【微信：176555708】【奥塔哥大学毕业证成绩单-学位证】【微信：176555708】（留信学历认证永久存档查询）采用学校原版纸张、特殊工艺完全按照原版一比一制作（包括：隐形水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠，文字图案浮雕，激光镭射，紫外荧光，温感，复印防伪）行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备，十五年致力于帮助留学生解决难题，业务范围有加拿大、英国、澳洲、韩国、美国、新加坡，新西兰等学历材料，包您满意。
◆◆◆◆◆ — — — — — — — — 【留学教育】留学归国服务中心 — — — — — -◆◆◆◆◆
【主营项目】
一.毕业证【微信：176555708】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【微信：176555708】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分→ 【关于价格问题（保证一手价格）
我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子 我给客户的都是第一手的代理价格，因为我想坦诚对待大家 不想跟大家在价格方面浪费时间
对于老客户或者被老客户介绍过来的朋友，我们都会适当给一些优惠。
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
选择实体注册公司办理，更放心，更安全！我们的承诺：可来公司面谈，可签订合同，会陪同客户一起到教育部认证窗口递交认证材料，客户在教育部官方认证查询网站查询到认证通过结果后付款，不成功不收费！
学历顾问：微信：176555708
Understanding Inductive Bias in Machine Learning
This presentation explores the concept of inductive bias in machine learning. It explains how algorithms come with built-in assumptions and preferences that guide the learning process. You'll learn about the different types of inductive bias and how they can impact the performance and generalizability of machine learning models.
The presentation also covers the positive and negative aspects of inductive bias, along with strategies for mitigating potential drawbacks. We'll explore examples of how bias manifests in algorithms like neural networks and decision trees.
By understanding inductive bias, you can gain valuable insights into how machine learning models work and make informed decisions when building and deploying them.
Harnessing WebAssembly for Real-time Stateless Streaming Pipelines
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
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UofT毕业证原版定制【微信：176555708】【多伦多大学毕业证成绩单-学位证】【微信：176555708】（留信学历认证永久存档查询）采用学校原版纸张、特殊工艺完全按照原版一比一制作（包括：隐形水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠，文字图案浮雕，激光镭射，紫外荧光，温感，复印防伪）行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备，十五年致力于帮助留学生解决难题，业务范围有加拿大、英国、澳洲、韩国、美国、新加坡，新西兰等学历材料，包您满意。
◆◆◆◆◆ — — — — — — — — 【留学教育】留学归国服务中心 — — — — — -◆◆◆◆◆
【主营项目】
一.毕业证【微信：176555708】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【微信：176555708】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分→ 【关于价格问题（保证一手价格）
我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子 我给客户的都是第一手的代理价格，因为我想坦诚对待大家 不想跟大家在价格方面浪费时间
对于老客户或者被老客户介绍过来的朋友，我们都会适当给一些优惠。
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
选择实体注册公司办理，更放心，更安全！我们的承诺：可来公司面谈，可签订合同，会陪同客户一起到教育部认证窗口递交认证材料，客户在教育部官方认证查询网站查询到认证通过结果后付款，不成功不收费！
学历顾问：微信：176555708
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Feed at LinkedIn (Quora Talk)
- 2. Feed @LinkedIn Overview Ankit Gupta Engineer, LinkedIn Shubham Gupta Engineer, LinkedIn Vivek Nelamangala Engineer, LinkedIn
- 3. Today’s agenda 15:00 The LinkedIn Feed 15:15 Activity Store 15:20 FollowFeed 15:25 Operational Story of FollowFeed 15:35 Q&A
- 4. The LinkedIn Feed The personalized “home page” of LinkedIn A heterogenous list of updates produced by a user’s network In addition, we also show other recommendations (jobs, articles, people) and monetize via native ads. Mission: Give professionals the power to stay informed to make them more productive and successful every day. The Feed is:
- 5. Share Like Sponsored Content Comment News recommendation Connect Organic updates Recommendation Feed Composition
- 6. Creation ● Member sharing ● Member publishing ● Video ● Editorial Tools DiscoveryEngagement ● Feed Experience ● Follow Ecosystem ● Conversations/Comments ● Sponsored Updates ● Control of Feed ● Promotions ● Feed Relevance ● Feed delivered as Email ● Notifications Feed is an ecosystem
- 7. Activity Data Model ● AVO triples ○ Actor: “Jeff Weiner” ○ Verb: “Shared” ○ Object: “Article” ● Visibility ○ [Public, Self, Connections, Follow] ● Domain Entity (optional) ○ Activity “Foreign Key”
- 8. 1. Homepage request 2. Fetch viewer’s network and features 4. Resolve activities 3. Call data sources Client Feed Mixer (Blend across data sources) FollowFeed Social Graph Service Sponsored Content (Ads) Trending in Industry Activities store Activities Database Activities stream Features store Stats Server Sharing Profiles Read Write People You May Know Jobs Recommend ations
- 10. Activity Store Data stored in an in-house distributed document database called Espresso Keyed by Activity ID Unified Social Content Platform Flexible Schema Single distribution pipeline
- 11. FollowFeed
- 12. FollowFeed ● Term-partitioned index ○ Different from generic search indices which are partitioned by documents ○ Partitioned by actor (ex, member:1, school:2) ● Posting list of reverse chronologically ordered list of activities by or about an actor
- 13. m1 m2 c1 m3 m4 m5 m6 s7 s8 Storage cluster partition 1 partition 2 partition N Activities stream Partitioner cluster Query cluster Get Updates for viewer with network {m1, c1, m6} {m1, c1} {m6} Features Pipeline
- 14. FollowFeed Storage - Layers Timeline Index Filtering Ranking topK
- 15. FollowFeed select activities where (required) actor IN <my network> TimeRange between [start, end] OR count = <C> where (optional) (actor type | verb type | object type) in <X> Visibility is (connections-only OR followees-only OR public) sort by time OR relevance
- 16. Why embedded? Bring computation closer to data Allows scoring of tens of millions of records per second Less data transferred over the wire Colocation of relevance features and data Document features RocksDB as embedded database Open sourced by Facebook in 2014
- 17. Operational Story of FollowFeed
- 18. Traffic Metrics Performance testing during development Legacy System Log collection system Log collector Disk Log processor and replay FollowFeed Access logs Live traffic (read only)
- 20. Dark Canary Request dispatcher FollowFeed live node FollowFeed dark canary node Request Response Copy of request metrics
- 21. No Alerts Left Behind ● Meaningful thresholds ● Each alert has an action ● Alerts only on external symptoms ● An underlying issue triggers only a single alert
- 22. Backup FollowFeed Node Backup NBackup 2Backup 1 Cron Script HDFS Copy to HDFS Call to backup API ...
- 23. Restore New FollowFeed Node Copy from HDFS Backup NBackup 2Backup 1 HDFS ...
- 24. Rebalancing Rebalance script Box 1 Partitions 0..19 Box 2 Partitions 20..39 Box 3 Partitions 40..59 Box 1 Partitions 0..14 Box 2 Partitions 15..29 Box 3 Partitions 30..44 Box 4 Partitions 45..59
- 25. Rebalancing New FollowFeed Node 1 Backup NBackup 3Backup 1 HDFS Extension of restore script New FollowFeed Node 2 Backup 2 New FollowFeed Node 3 New FollowFeed Node N Copy from HDFS … …
- 26. Questions
- 27. Appendix
- 28. Timeline storage structure Blob 1 Blob 2 Blob 3
- 29. Timeline storage structure Blob 1 Blob 2 Blob 3 Blob header Update N Update N- 1 Update N- 2 …… Next blob key