1) RDI uses RavenDB embedded in over 36,000 restaurants with around 500,000 individual machines processing $50,000 per second in payments.
2) RavenDB allows for unit testing without mocking the database, advanced statistics on data persistence, and transparent replication with high availability.
3) The challenges of using RavenDB on specialized older hardware with low memory and ESENT include fine-tuning memory usage, disabling caching, and automating recovery from unclean shutdowns with ESENTUTL.EXE.
Zapping ever faster: how Zap sped up by two orders of magnitude using RavenDBOren Eini
Join a real uplift experience with Hagay Albo, the CTO of the Zap/Yellow Page Group in Israel, in which he explains how his team was able to take a legacy (slow and hard to modify) group of sites and make them easier to work with, MUCH faster and greatly simplified the operational environment.
By prioritizing high availability, flexible data modeling and focusing on raw speed Zap was able to reduce its load times by Two Orders of Magnitudes. Using RavenDB as the core engine behind Zap's new sites had improved site traffic, reduced time to market and made it possible to implement the next-gen features that were previously beyond reach.
Oren Eini discusses the next major version of RavenDB 4.0, running on the CoreCLR, and skim over topics of performance (much higher), flexibility and ease of use.
From the new consensus based clustering to active data exploration, RavenDB 3.5 contains quite a lot of new features, improvement and fixes. In this keynote Oren Eini will showcase RavenDB 3.5 new features. Including SLAs, I/O monitoring, improved performance and stability, smarter replication, and more.
Know thy cost (or where performance problems lurk)Oren Eini
Performance happens. Whether you're designed for it or not it doesn’t matter, she is always invited to the party (and you better find her in a good mood). Knowing the cost of every operation, and how it distributes on every subsystem will ensure that when you are building that proof-of-concept (that always ends up in production) or designing the latest’s enterprise-grade application; you will know where those pesky performance bugs like to inhabit. In this session, we will go deep into the inner working of every performance sensitive subsystem. From the relative safety of the client to the binary world of Voron.
Lessons from the Trenches - Building Enterprise Applications with RavenDBOren Eini
It's easy, fun, and simple to get a prototype application built with RavenDB, but what happens when you get to the point of shipping v1.0 into Production? Many of the subtle decisions made during development can have undesirable consequences in Production. In this session, Dan Bishop will explore some of the pain points that arise when building, deploying, and supporting enterprise-grade applications with RavenDB.
Cassandra Summit 2014: Deploying Cassandra for Call of DutyDataStax Academy
Presenters: Seán O Sullivan, Service Reliability Engineer & Tim Czerniak, Software Engineer at Demonware
This presentation covers the eight-month evaluation process we underwent to migrate some of Call of Duty’s core services from MySQL to Cassandra. We will outline our requirements, the process we followed for the evaluation, decisions we made around our schema, configuration and hardware, and some issues we encountered.
History of Engine Yard's relationship with PostgreSQL. How we went from minimal PostgreSQL support to making it our new default.
Video is available here: http://www.youtube.com/watch?v=sFfJjfOk9NA
Porting ASP.NET applications to Windows AzureGunnar Peipman
Hosting applications on Windows Azure is simple but there are things to change when cloud-enabling existing web applications because cloud is conceptually different than on-premises or shared hosting environment. This sessions goes through main issues one will face when moving applications to cloud. Real-life examples provide elegant solutions to problems and through demos the audience will see how to deploy applications to cloud and how to test and run cloud and hybrid applications on your development machine.
Zapping ever faster: how Zap sped up by two orders of magnitude using RavenDBOren Eini
Join a real uplift experience with Hagay Albo, the CTO of the Zap/Yellow Page Group in Israel, in which he explains how his team was able to take a legacy (slow and hard to modify) group of sites and make them easier to work with, MUCH faster and greatly simplified the operational environment.
By prioritizing high availability, flexible data modeling and focusing on raw speed Zap was able to reduce its load times by Two Orders of Magnitudes. Using RavenDB as the core engine behind Zap's new sites had improved site traffic, reduced time to market and made it possible to implement the next-gen features that were previously beyond reach.
Oren Eini discusses the next major version of RavenDB 4.0, running on the CoreCLR, and skim over topics of performance (much higher), flexibility and ease of use.
From the new consensus based clustering to active data exploration, RavenDB 3.5 contains quite a lot of new features, improvement and fixes. In this keynote Oren Eini will showcase RavenDB 3.5 new features. Including SLAs, I/O monitoring, improved performance and stability, smarter replication, and more.
Know thy cost (or where performance problems lurk)Oren Eini
Performance happens. Whether you're designed for it or not it doesn’t matter, she is always invited to the party (and you better find her in a good mood). Knowing the cost of every operation, and how it distributes on every subsystem will ensure that when you are building that proof-of-concept (that always ends up in production) or designing the latest’s enterprise-grade application; you will know where those pesky performance bugs like to inhabit. In this session, we will go deep into the inner working of every performance sensitive subsystem. From the relative safety of the client to the binary world of Voron.
Lessons from the Trenches - Building Enterprise Applications with RavenDBOren Eini
It's easy, fun, and simple to get a prototype application built with RavenDB, but what happens when you get to the point of shipping v1.0 into Production? Many of the subtle decisions made during development can have undesirable consequences in Production. In this session, Dan Bishop will explore some of the pain points that arise when building, deploying, and supporting enterprise-grade applications with RavenDB.
Cassandra Summit 2014: Deploying Cassandra for Call of DutyDataStax Academy
Presenters: Seán O Sullivan, Service Reliability Engineer & Tim Czerniak, Software Engineer at Demonware
This presentation covers the eight-month evaluation process we underwent to migrate some of Call of Duty’s core services from MySQL to Cassandra. We will outline our requirements, the process we followed for the evaluation, decisions we made around our schema, configuration and hardware, and some issues we encountered.
History of Engine Yard's relationship with PostgreSQL. How we went from minimal PostgreSQL support to making it our new default.
Video is available here: http://www.youtube.com/watch?v=sFfJjfOk9NA
Porting ASP.NET applications to Windows AzureGunnar Peipman
Hosting applications on Windows Azure is simple but there are things to change when cloud-enabling existing web applications because cloud is conceptually different than on-premises or shared hosting environment. This sessions goes through main issues one will face when moving applications to cloud. Real-life examples provide elegant solutions to problems and through demos the audience will see how to deploy applications to cloud and how to test and run cloud and hybrid applications on your development machine.
Reuven Lerner's first talk from Open Ruby Day, at Hi-Tech College in Herzliya, Israel, on June 27th 2010. An overview of what makes Rails a powerful framework for Web development -- what attracted Reuven to it, what are the components that most speak to him, and why others should consider Rails for their Web applications.
Cache solutions that can be used when developing applications have been examined. Redis, MemCache, JCache, and Hazelcast comparisons were made.
Performance, Security, Storage Capability and Eviction Policy, Maintenance, Reliability, Cost and also Who's using what.
Aws 12 Month Free Tier for Web Designers and DevelopersDylan Burris
An open source focused (Drupal and WordPress) breakdown for web designers and web developers of resources which are available for free on the Amazon Web Services Free tier.
In this talk from the Dublin Websummit 2014 AWS Technical Evangelist Danilo Poccia discusses NoSQL technology.
Includes an introduction to NoSQL DB and a discussion of when it is time to consider NoSQL.
Danilo also introduces Amazon DynamoDB as a NoSQL solution and talks through several case studies of customers that are using Amazon DynamoDB today.
I3 - Running SharePoint 2016 in Azure the do's and dont's - Jasjit ChopraSPS Paris
In this session we are going to discuss the entire process of planning and successfully running SharePoint 2016 in the cloud. We will cover topics related to Security, Performance, Scalability, High Availability, Backup & Restore and Disaster Recovery. We will also cover the IaC (Infrastructure as Code) use case scenario in this deployment.
Introduction to CosmosDB - Azure Bootcamp 2018Josh Carlisle
[Session Abstract] Cosmos DB is a globally distributed, multi-model, Serverless, NoSQL database solution that runs on Microsoft Azure. With guaranteed SLAs, various consistency models, and support for multiple APIs, Cosmos DB can have many advantages over common relational database solutions. However, the shift to NoSQL in addition to the numerous configuration options available in Cosmos DB can be a challenge for traditional relational database developers. In this talk, we will take an existing application built on a traditional relational database and update the solution to take advantage of Cosmos DB. Along the way, we will have many decisions to make including which API we should use, how best to model our data, which consistency model to use, and how our data should be indexed, partitioned, and organized. By the end of the talk you should have familiarity with the decisions you will need to make to successfully implement your own solutions on Cosmos DB.
A Gentle Introduction to Functions-as-a-ServiceValeri Karpov
Slides from my talk on functions-as-a-service at Wyncode Academy in Miami in April '18. Provides an overview of the tradeoffs between different FaaS providers
BDM37: Hadoop in production – the war stories by Nikolaï Grigoriev, Principal...Big Data Montreal
Sharing of Hadoop cluster deployment experience in production from scratch on real hardware. Brief overview of Hadoop stack, its components, major deployment and configuration challenges, performance tuning and application tuning experience. Some “war stories” about the issues we have faced while operating, the benefits of DevOps approach for running Hadoop apps.
Reuven Lerner's first talk from Open Ruby Day, at Hi-Tech College in Herzliya, Israel, on June 27th 2010. An overview of what makes Rails a powerful framework for Web development -- what attracted Reuven to it, what are the components that most speak to him, and why others should consider Rails for their Web applications.
Cache solutions that can be used when developing applications have been examined. Redis, MemCache, JCache, and Hazelcast comparisons were made.
Performance, Security, Storage Capability and Eviction Policy, Maintenance, Reliability, Cost and also Who's using what.
Aws 12 Month Free Tier for Web Designers and DevelopersDylan Burris
An open source focused (Drupal and WordPress) breakdown for web designers and web developers of resources which are available for free on the Amazon Web Services Free tier.
In this talk from the Dublin Websummit 2014 AWS Technical Evangelist Danilo Poccia discusses NoSQL technology.
Includes an introduction to NoSQL DB and a discussion of when it is time to consider NoSQL.
Danilo also introduces Amazon DynamoDB as a NoSQL solution and talks through several case studies of customers that are using Amazon DynamoDB today.
I3 - Running SharePoint 2016 in Azure the do's and dont's - Jasjit ChopraSPS Paris
In this session we are going to discuss the entire process of planning and successfully running SharePoint 2016 in the cloud. We will cover topics related to Security, Performance, Scalability, High Availability, Backup & Restore and Disaster Recovery. We will also cover the IaC (Infrastructure as Code) use case scenario in this deployment.
Introduction to CosmosDB - Azure Bootcamp 2018Josh Carlisle
[Session Abstract] Cosmos DB is a globally distributed, multi-model, Serverless, NoSQL database solution that runs on Microsoft Azure. With guaranteed SLAs, various consistency models, and support for multiple APIs, Cosmos DB can have many advantages over common relational database solutions. However, the shift to NoSQL in addition to the numerous configuration options available in Cosmos DB can be a challenge for traditional relational database developers. In this talk, we will take an existing application built on a traditional relational database and update the solution to take advantage of Cosmos DB. Along the way, we will have many decisions to make including which API we should use, how best to model our data, which consistency model to use, and how our data should be indexed, partitioned, and organized. By the end of the talk you should have familiarity with the decisions you will need to make to successfully implement your own solutions on Cosmos DB.
A Gentle Introduction to Functions-as-a-ServiceValeri Karpov
Slides from my talk on functions-as-a-service at Wyncode Academy in Miami in April '18. Provides an overview of the tradeoffs between different FaaS providers
BDM37: Hadoop in production – the war stories by Nikolaï Grigoriev, Principal...Big Data Montreal
Sharing of Hadoop cluster deployment experience in production from scratch on real hardware. Brief overview of Hadoop stack, its components, major deployment and configuration challenges, performance tuning and application tuning experience. Some “war stories” about the issues we have faced while operating, the benefits of DevOps approach for running Hadoop apps.
Scaling a High Traffic Web Application: Our Journey from Java to PHP120bi
What makes an application scale? What should you worry about early on and what can wait?
Over the last 3 years, Achievers has learned many lessons and gained fundamental knowledge on scaling our SaaS platform. CTO Dr. Aris Zakinthinos will present and discuss the decisions we’ve made including language choice, server architecture, and much more; join us while we share tips, tricks, and things to absolutely avoid.
Throughout the evening you will have the opportunity to talk to the development team behind the Achievers Platform and ask questions on scaling best practices.
Polyglot Persistence - Two Great Tastes That Taste Great TogetherJohn Wood
The days of the relational database being a one-stop-shop for all of your persistence needs are over. Although NoSQL databases address some issues that can’t be addressed by relational databases, the opposite is true as well. The relational database offers an unparalleled feature set and rock solid stability. One cannot underestimate the importance of using the right tool for the job, and for some jobs, one tool is not enough. This talk focuses on the strength and weaknesses of both relational and NoSQL databases, the benefits and challenges of polyglot persistence, and examples of polyglot persistence in the wild.
These slides were presented at WindyCityDB 2010.
Not a DBA but your work thinks you are? This is the session for you. We will give you a crash course into the most valuable variables, places to look, and gotcha's. This is not designed to replace traditional training but rather to ensure you at least have the most basic skills to ensure your foray into the world of MySQL DBA's gets off on a good foot.
Database Provisioning in EM12c: Provision me a Database Now!Maaz Anjum
My presentation for Georgia Oracle User Group on December 12, 2013. In it, I discuss the Database Provisioning feature in Enterprise Manager 12c with an example of how I architected a solution by leveraging it.
These slides are part of a presentation I gave on a Google Hangout on air regarding Python Performance Profiling. Specifically, I explore examining both development and production environments, build systems, testing frameworks (py.test & nose), various profilers for dev, and how to profile in production. The full talk is on youtube here: https://www.youtube.com/watch?v=tZc-v0-3OKQ
DCSF19 Transforming a 15+ Year Old Semiconductor Manufacturing EnvironmentDocker, Inc.
Jeanie Schwenk, Jireh Semiconductor
Jireh Semiconductor bought the Hillsboro fab and its contents including the manufacturing tools, servers, and software running the fab. The previous company had been winding down for years so server and software upgrades had not been on the radar for some time. In 2011 Jireh became the proud owner of the building, the tools, and its legacy software running on servers that weren’t even made any more.
That's when I started my adventure with Jireh in September 2016 with a charter to modernize the applications running the manufacturing facility process and move them into VMs with no impact to manufacturing. That led me down a path of exploration and questions. “What’s the goal?”
The goal wasn't to move to VMs. It was to become independent of the aging PA-RISC architecture, bring forward the ~230 java 1.4.2 applications (10-15 years old), scale to allow increased the load on the software and hardware in order to ramp the factory output to numbers never seen previously. And do it without manufacturing downtime.
The solution included a transition from waterfall and silo development to agile scrum. Rather than simply migrating to VMs, it became obvious the lynch pin for a successful software transition with the required uptime, flexibility, and scalability was Docker Enterprise.
Join me for this session where I'll talk about my journey modernizing 15+ year old applications and infrastructure at Jireh.
OSMC 2019 | How to improve database Observability by Charles JudithNETWAYS
Delivering a database service is not a simple job but to ensure that everything is working correctly your platform needs to be observable. In this talk, I’ll talk about how we make the MySQL/MariaDB databases observable. We’ll talk about the RED, USE methods, and the golden signals. You’ll discover how we dealt with the following questions “We think the database is slow”. This talk will allow you to make your databases discoverable with open source solutions.
Where to start? - the first 2 hours of performance troubleshooting
• The performance cheat sheet: cover all the basics before you start
• Data collections and mining the logs
• Common techniques to improve performance
Роман Нікітченко
Big Data solutions architect в компанії V.I.Tech. Спеціаліст з більш ніж 20-річним досвідом роботи в галузі телекому і вбудованих систем, що змінив індустрію на Java Enterprise. Завдяки попередньому досвіду за короткий термін став одним з провідних архітекторів Big Data в Україні.
Similar to RavenDB embedded at massive scales (20)
.Net Garbage Collector is an important factor in improving development efficiency by eliminating the need to manually manage memory.
But sometimes, it's overhead may cause very long pauses in application execution. In this talk, I will show why this happens and how we can deal with it.
This talk will explore how we REBOOTED our Project Design. After a decade of production usage, the RavenDB team addressed a lot of ongoing concerns & changed some of RavenDB's core architecture.
We'll investigate the driving forces behind it, the reasoning process & look at how it all turned out.
Implementing CQRS and Event Sourcing with RavenDBOren Eini
CQRS stands for Command Query Responsibility Segregation. That is, that command stack and query stack are designed separately. This leads to a dramatic simplification of design and potential enhancement of scalability.
Events are a new trend in software industry. In real-world, we perform actions and these actions generate a reaction. Event Sourcing is about persisting events and rebuilding the state of the aggregates from recorded events.
In this talk I will share a lot of examples about how to effective implementing CQRS and Event Sourcing with RavenDB
For the last 40 years or so, we used relational databases successfully in nearly all business contexts and systems of nearly all sizes. Therefore, if you feel no pain using a RDBMS, you can stay with it. But, if you always have to work around your RDBMS to get your job done, a document oriented database might be worth a look.
RavenDB is a 2nd generation document database that allows you to write a data-access layer with much more freedom and many less constraints. If you have to work with large volumes of data, thousands of queries per second, unstructured/semi-structured data or event sourcing, you will find RavenDB particulary rewarding.
In this talk we will explore some document database usage scenarios. I will share some data modeling techniques and many architectural criteria to help you to decide where safely adopt RavenDB as a right choice.
Delving into Documents with Data SubscriptionsOren Eini
You've got documents coming in fast. There's long running processing that needs to happen, but you don't want users to have to wait when they submit data. Don't worry! Data Subscriptions provide a way to reliably process documents asynchronously from the rest of your application. In this talk, we'll cover the basics of Data Subscriptions to get your processing jobs running quickly and efficiently.
Building Codealike: a journey into the developers analytics worldOren Eini
Codealike plugins in Visual Studio, Eclipse and Chrome, track developers while they code and perform analytic calculations at the millisecond level. For such write heavy workloads and using RavenDB as the main and only database was not without challenge. In this talk, we will reveal how we built and scaled such a solution, how we were able to improve performance with Voron and glance at our own mistakes and architectural choices down the line.
Modern web development is uniquely fast-paced, demands rapid development and responsiveness to changes. But our databases have been stuck in the 1970s with rigid schemas and antiquated query languages. Enter RavenDB: flexible, fast, designed for the 21st century. It's the perfect side to your web development dish.
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...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.
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
DevOps and Testing slides at DASA ConnectKari Kakkonen
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Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
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Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
2. ABOUT ME
Rodrigo Rosauro, Software Architect Manager at RDI
• Technology passionate
• Developer
• 14 years of experience in software development
• Working with RavenDB since 2013
3. ABOUT RDI
• We make restaurant automation software for QSR
• Our software runs on more than 36K restaurants
• Estimated number of individual machines: around half a million
• Processing almost USD $50K per second of customer payments
4. “ONE IN A MILLION IS NEXT TUESDAY”
- Gordon Letwin, Architect for DOS 4
5. HOW WE USED TO PERSIST DATA ON POS
... and still do (on legacy modules)
6. LEGACY PERSISTENCY
• Flat files
• Custom data format
• Event sourcing persistence
• Rebuild in-memory state at
every restart
7. PROBLEMS WITH THAT APPROACH
•No querying – at all
•High complexity to store new data
•No standard data format
•Lack of management tools
9. WHY A DBMS?
• We started a full re-architecture of the POS platform
• We are definitely not database/persistence specialists
• We wanted to remove complexity to persist data
11. GOALS / GUIDELINES
• The new architecture is based on plug-ins, so we wanted each
individual plug-in to have its own, isolated, database
• Zero administration
• Easy schema upgrades
• Transparent replication
• Unit tests
15. RAVENDB AT RDI
• Create unit tests without mocking the database
• Have advanced statistics about the data persistence
• Both system-wide and per plug-in
• Transparent replication
• Hot failover, data distribution & real-time backups
• Transparent encryption of data at rest
18. SPECIALIZED, OLD HARDWARE
Old hardware (sometimes 10 years old) means that we have very little
memory and processing power.
19. MEMORY CONSTRAINTS
• Many iterations with the RavenDB support team to fine-tune its memory
usage
• We learned that under these constraints, caching can be evil
• In the end, the solution was to completely disable caching on RavenDB and
do some cache at the application side, only for the “hot” data.
21. WE ARE STILL USING RAVENDB 2.5
• Our software must support Windows XPe
• .NET 4.0
• 32 bits machines
• … this means that ESENT is our only option for now
22. FACT: WE DON’T LIKE ESENT
(at least not for our usage scenarios)
23. WHY?
• Any unclean shutdown may cause a completely undetermined result
• Power outages / Application crashes / Task kill
• The possible results are not easy to find out during regular testing
• Crappy hardware doesn’t help
• We still face sporadic full database losses with ESENT
• Copying data between OS versions is awful
• Recovering from most unclean shutdowns requires using ESENTUTL.EXE
24. ESENTUTL.EXE
• We also hate don’t like ESENTUTL.EXE
• Many different commands to attempt to recover from different kinds of
unclean shutdowns. Some have different syntax on different OS versions
• We had to automate all that (zero maintenance, remember?)
• Almost 500 lines of code
25. “SUCCESS IS STUMBLING FROM FAILURE TO
FAILURE WITH NO LOSS OF ENTHUSIASM”
― Winston S. Churchill, Ex-prime minister of UK
27. THE FUTURE
• Working with Hibernating Rhinos to improve Voron to our use case
• 32 bits support
• Better reliability on unclean shutdowns
• We may jump straight to RavenDB 4.0 & CoreCLR
• Long-term target: Around 250K individual POS nodes running RavenDB
embedded
