Distributed Systems Pattern: State Watch

Martin Fowler

Clients are interested in changes to the specific values on the server. It's difficult for clients to structure their logic if they need to poll the server continuously to look for changes. If clients open too many connections to the server for watching changes, it can overwhelm the server. more….

System 232

Distributed Systems Pattern: Lease

Martin Fowler

Cluster nodes need exclusive access to certain resources. But nodes can crash; they can be temporarily disconnected or experiencing a process pause. Under these error scenarios, they should not keep the access to a resource indefinitely. more…. skip-home-page

System 188
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Patterns of Distributed Systems

Martin Fowler

Over the last few months, my colleague Unmesh Joshi has been running workshops to teach developers about distributed systems design. In this work he's been delving into many open-source distributed systems and identifying patterns.

System 285

Patterns of Distributed Systems

Martin Fowler

Over the last few months, my colleague Unmesh Joshi has been running workshops to teach developers about distributed systems design. In this work he's been delving into many open-source distributed systems and identifying patterns.

System 285

Humility in AI: Building Trustworthy and Ethical AI Systems

AI is becoming ubiquitous. More and more critical decisions are automated through machine learning models, determining the future of a business or making life-altering decisions for real people. The number of critical touch points is growing exponentially with the adoption of AI. In this ebook, we explore the concept of humility in AI systems and how it can be applied to existing solutions to ensure their trustworthiness, ethicality, and reliability in a fast-changing world.

Distributed Systems Pattern: Quorum

Martin Fowler

Distributed systems may get partitioned, when the nodes in the cluster no longer talk to all the others. Unmesh explains that, because of this, we need a quorum of nodes within a partition to accept a change.

System 227

Distributed Systems Pattern: Segmented Log

Martin Fowler

A single log file can grow and become a performance bottleneck while its read at the startup. Older logs are cleaned up periodically and doing cleanup operations on a single huge file is difficult to implement. A Segmented Log splits the logfile into smaller files.

System 261

Distributed Systems Pattern: Request Pipeline

Martin Fowler

Communicating between servers within a cluster using Single Socket Channel can cause performance issues if requests need to wait for responses for previous requests to be returned.

System 224

Distributed Systems Pattern: Single Socket Channel

Martin Fowler

We need to do this while keeping the cost of new connections low, so that opening new connections doesn't increase the system's latency.

System 241

Distributed Systems Pattern: Write-Ahead Log

Martin Fowler

In the latest part of his collection of Patterns of Distributed Systems, Unmesh faces the problem of a server failing in the middle of a complex update.

System 236

The Pro’s Guide To Getting The Best ROI From Your New LMS

You need a Learning Management System when your courses and training programs need to be accessible online. Quickly build the perfect business case and easily determine which LMS will provide the best return on investment you need with this how-to eBook!

Distributed Systems Pattern: Leader and Followers

Martin Fowler

In a distributed system, it's often best to not make all the nodes equal. Unmesh shows how a leader can simplify coordination across a cluster, and how choosing that leader is often tricky.

System 229

Cisco Systems pulls back from smart city push

CTOvision

Cisco Systems Inc. News Cisco Cisco Systems Incis pulling the plug on a flagship effort to help digitize the modern city, the latest example of a big tech company struggling to enter a new […].

Distributed Systems Pattern: Singular Update Queue

Martin Fowler

But if the tasks being performed are time consuming, like writing to a file, blocking all the other calling threads until the task is completed can have severe impact on overall system throughput and latency.

System 202

Distributed Systems Pattern: High-Water Mark

Martin Fowler

Unmesh adds High-Water Mark to his collection of patterns. The high-water mark is an index into the log file that records the last log entry that is known to have successfully replicated to a Quorum of followers. The leader also passes on the high-water mark to its followers during its replication. All servers in the cluster should only transmit data to clients that reflects updates that are below the high-water mark. more…. skip-home-page

System 207

eLearning demand is at an all-time high. Pick the right LMS!

The need for online learning is greater than ever having the right LMS is absolutely crucial. Quickly, easily, and cost-effectively decide which Learning Management System is right for you with this 12-step guide from LMS implementation experts.

System Configuration

DevOps.com

The post System Configuration appeared first on DevOps.com. Blogs ROELBOB CRD docker humor Istio kubernetes satire

Distributed Systems Pattern: Low-Water Mark

Martin Fowler

The write ahead log maintains every update to persistent store. It can grow indefinitely over time. Segmented Log allows dealing with smaller files at a time, but total disk storage can grow indefinitely if not checked.

System 192

Systems Thinking, Episode #2: Complex Adaptive Systems

Scrum.org

In my previous 2 episodes of this series on Systems Thinking, I elaborated on what systems Thinking is and on the Wicked Problems Systems Thinking is trying to solve. In this episode, I want to explore Complex Adaptive Systems (CAS). In Systems Thinking, we observe different types of systems. There are static systems like cars and complex systems like people for instance. Complex Adaptive Systems. picture by Cabrera.

System 141

Systems Thinking in Organizational Coaching

Scrum.org

This is quite a long read which you can download as the whitepaper "Systems Thinking in Organizational Coaching". In his book “Thinking, Fast and Slow”, Daniel Kahneman writes about the two types of systems: . System 1 works automatically and quickly. System 2 has to be switched on consciously, works slowly, and is responsible for the complex analysis of situations. The majority of issues in complex environment cannot be best solved using System 1.

Why Distributed Tracing is Essential for Performance and Reliability

Speaker: Daniel "spoons" Spoonhower, CTO and Co-Founder at Lightstep

Many engineering organizations have now adopted microservices or other loosely coupled architectures, often alongside DevOps practices. Together these have enabled individual service teams to become more independent and, as a result, have boosted developer velocity. However, this increased velocity often comes at the cost of overall application performance or reliability. Worse, teams often don’t understand what’s affecting performance or reliability – or even who to ask to learn more. Distributed tracing was developed at organizations like Google and Twitter to address these problems and has also come a long way in the decade since then. By the end of this presentation, you’ll understand why distributed tracing is necessary and how it can bring performance and reliability back under control.

Red Hat Automates More Operating System Tasks

DevOps.com

available in a few weeks, expands the Red Hat System Roles capability that provides a prescriptive and automated means of managing operating system […]. The post Red Hat Automates More Operating System Tasks appeared first on DevOps.com. AI Blogs DevOps in the Cloud automation containers operating system red hat rhelRed Hat today announced an update to Red Hat Enterprise Linux (RHEL) that automates a wide range of manual tasks.

Systems Thinking episode #4: DSRP

Scrum.org

Like many Scrum Masters, Agile Coaches and Agile Managers, I am beginning to understand organizations are complex adaptive systems. Some time ago I decided to dive a bit deeper into Systems Thinking. Aspects of Systems Thinking. Systems Thinking has evolved a lot since it got started in the fifties. The overview below is a summary of subjects found in publications and lectures of various System Thinkers. Systems. Why is seeing systems important?

System 162

The Systems Approach in Organizational Transformations

Agile Alliance

I had the pleasure of interviewing Maica Trinidad, who is an anthropologist by training and an Agilist by vocation. People agile transformation business agility organizational development video

System 180

COVID-19 and Complex Systems

O'Reilly Media - Ideas

In various mailing lists about the COVID-19 pandemic, I’ve seen several discussions of “complex systems theory” as, possibly, a way to understand how the pandemic is playing out in different locations. The argument is that some systems are intrinsically difficult to model. “Complex systems” has always implied, at least to me, systems of nonlinear differential equations, chaotic processes, and the like.

Building Evolvable Architectures

Speaker: Dr. Rebecca Parsons, CTO of ThoughtWorks

The software development ecosystem exists in a state of dynamic equilibrium, where any new tool, framework, or technique leads to disruption and the establishment of a new equilibrium. Predictability is impossible when the foundation architects plan against is constantly changing in unexpected ways. It’s no surprise many CIOs and CTOs are struggling to adapt, in part because their architecture isn’t equipped to evolve. This webinar will discuss what’s at stake if companies continue to use long term architecture plans.

Integrated Workplace Management Systems (IWMS) for the Post-Pandemic Reality

IDC

Understand major trends influencing integrated workplace management systems (IWMS) in the new IDC MarketScape report with Juliana Beauvais. Cloud featured integrated workplace management systems IWMS

18 Signs of a Systemic Toxic Team Culture

Scrum.org

TL; DR: 18 Signs of a Systemic Toxic Team Culture. What looked like a good idea back in the 1990ies—outsourcing software development as a non-essential business area—has meanwhile massively backfired for a lot of legacy organizations.

System Orchestration

DevOps.com

The post System Orchestration appeared first on DevOps.com. Blogs ROELBOB

Systemic Consciousness for Social Justice with Michael Spayd

Agile Alliance

The post Systemic Consciousness for Social Justice with Michael Spayd first appeared on Agile Alliance. BIPOC Video webcast

Social 158

Schema Evolution Patterns

Speaker: Alex Rasmussen, CEO, Bits on Disk

If you want to make your development team squirm, ask them about database schema changes or API versioning. Most development teams struggle with changing database schemas and updating API versions without breaking existing code. Alex Rasmussen is an expert in helping teams through these struggles. His talk will examine database schema changes and API versioning as two instances of schema evolution: how your systems respond when the structure of your structured data changes.

Why are Artificial Intelligence systems biased?

CTOvision

Read Subbarao Kambhapati take a look at why artificial intelligence technology is biased on The Hill: A machine-learned AI system used to assess recidivism risks in Broward County, Fla., often […].

All Systems Go! Becoming a “Systems-Smart” Generation

Linda Booth Sweeney

As adults, it is easy to miss this simple truth: a cow is a complex, living system, in the same way that the human body, a family, a classroom, a community, an organization, or an ocean is. A system is composed of parts and processes that interact over time—often in closed-loop patterns of cause and effect—to serve some purpose or function. Living systems, unlike a collection or “heap of stuff ,” share similar characteristics. Make the Shift: Systems Are the Context.

Editor's Soapbox: On Systemic Debt

The Daily WTF

The application had a complex sorting/paging system designed to prevent fetching more than one page of data at a time for performance reasons. They ruled the system. They had a lot of power over this system, and this was a system handling millions of dollars. It's fair to say that no one fully understood the system. TIP accrued technical debt far more quickly than most systems would. All systems accrue systemic debt.

Legacy Systems: Should They Stay or Should They Go?

DevOps.com

But does that mean legacy systems should be replaced? The post Legacy Systems: Should They Stay or Should They Go? Digital transformation requires new technologies.

How Product Managers Can Learn to Love Reporting

Speaker: Eric Feinstein, Professional Services Manager, Looker

He will use the example of a product manager of a learning management software system and how she would go through the process of defining reporting for users of the product. For a long time, Product Managers have found it challenging to design interfaces inside their products that users could use for reporting. It seems like PMs and engineers have grown to hate embedded reporting.