Last updated on Sep 5, 2024
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Load balancing
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Consistency and availability
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Partitioning and replication
4
Monitoring and testing
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Here’s what else to consider
Scaling distributed systems is a challenging task that requires careful planning and design. Distributed systems are composed of multiple nodes that communicate and coordinate with each other to perform a common goal, such as processing large amounts of data, serving web requests, or running complex algorithms. However, as the system grows in size, complexity, and demand, it may face issues such as performance degradation, reliability loss, security risks, or cost inefficiency. Therefore, it is important to consider some key factors when scaling distributed systems, such as:
Key takeaways from this article
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Implement load balancing:
Distribute workload evenly across your system's nodes to prevent any single point from becoming overwhelmed. This can significantly boost system performance and reliability.
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CAP theorem trade-offs:
Decide between consistency, availability, and partition tolerance based on your system's needs. This decision guides how you handle data across nodes, impacting user experience.
This summary is powered by AI and these experts
- Bipul Khan Deputy Director and Head of Solutions…
- Yotam Kadishay Experienced Engineering Leader |…
1 Load balancing
Load balancing is the process of distributing the workload among the nodes in the system, so that no single node becomes overloaded or underutilized. Load balancing can improve the performance, availability, and fault tolerance of the system, as well as reduce the latency and bandwidth consumption. Load balancing can be achieved by using different strategies, such as round-robin, hashing, or dynamic allocation, depending on the characteristics of the workload and the system. Load balancing can also be applied at different levels, such as network, application, or data, depending on the type and location of the bottleneck.
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- Nishant Mishra Software Engineer, AWS, GCP, Cloud Computing
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In my experience, load balancers also play a crucial role in security by distributing incoming traffic in a way that can help mitigate certain types of attacks, such as (DDoS) attack. It also provides features like SSL termination and web application firewalls for filtering malicious traffic.
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2 Consistency and availability
Consistency and availability are two important properties of distributed systems that describe how the system handles failures and updates. Consistency means that all the nodes in the system have the same view of the data at any given time, while availability means that the system can respond to requests even if some nodes fail. However, achieving both consistency and availability at the same time is impossible in a distributed system, as proven by the CAP theorem. Therefore, scaling distributed systems requires making trade-offs between consistency and availability, depending on the requirements and expectations of the system and the users. For example, some systems may prefer to sacrifice consistency for availability, such as social media platforms, while others may prefer to sacrifice availability for consistency, such as banking applications.
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- Bipul Khan Deputy Director and Head of Solutions Engineering,Technology at উপায় (UCB Fintech Company Limited)|MFS-DFS Architect|Micro-Service Architect|Financial Solution Architect|Blockchain Specialist.
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These two properties are often considered in conjunction with partition tolerance (the "P" in CAP theorem), which refers to a system's ability to continue operating despite network partitions or communication failures between nodes.According to the CAP theorem, in a distributed system, it is impossible to simultaneously achieve all three properties of Consistency, Availability, and Partition Tolerance.Ultimately, the choice between consistency and availability depends on the specific needs and use cases of the distributed system, as well as considerations such as performance, fault tolerance, and user experience.
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- Mahdi Azarboon Cloud Architect | Serverless | Content Developer
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Use asynchronous communication protocols and design autonomous components that interact through events. To share any value outside the component, use events and consumers should ideally subscribe to event streams. Implement end to end flow control mechanisms to manage unpredictable workloads and to degrade gracefully: consumers should control their own rate of consumption. Producers should be able to slow down or halt whenever needed. Message queues are good options to absorb extra workload and to allow consumers to drain the work at their leisure.
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3 Partitioning and replication
Partitioning and replication are two techniques that can help scale distributed systems by dividing and duplicating the data across the nodes in the system. Partitioning is the process of splitting the data into smaller and manageable chunks, called partitions or shards, and assigning them to different nodes. Partitioning can improve the scalability, performance, and availability of the system, as well as reduce the contention and hotspots. However, partitioning also introduces challenges, such as choosing a suitable partitioning scheme, balancing the load across the partitions, and handling cross-partition queries and transactions. Replication is the process of creating copies of the data on multiple nodes, called replicas. Replication can improve the availability, fault tolerance, and performance of the system, as well as provide backup and recovery options. However, replication also introduces challenges, such as maintaining consistency among the replicas, resolving conflicts and updates, and choosing a suitable replication strategy.
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- Mahdi Azarboon Cloud Architect | Serverless | Content Developer
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Leverage multi-core server’s parallelism by partitioning the monolithic state into smaller chunks which are managed independently from each other. This helps with scalability and fault tolerance but at the cost of consistency and simplicity.
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4 Monitoring and testing
Monitoring and testing are essential activities that can help scale distributed systems by detecting and resolving issues, ensuring quality and reliability, and providing feedback and insights. Monitoring is the process of collecting and analyzing various metrics and indicators from the system, such as performance, availability, errors, resources, or events. Monitoring can help identify and diagnose problems, optimize and tune the system, and alert and notify the stakeholders. Testing is the process of verifying and validating the functionality, performance, and security of the system, using different methods and tools, such as unit testing, integration testing, or load testing. Testing can help prevent and fix bugs, ensure compliance and compatibility, and evaluate and compare the system.
Scaling distributed systems is a complex and dynamic process that requires constant evaluation and adaptation. By considering these factors, you can design and implement scalable distributed systems that can meet the needs and expectations of your users and clients.
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- Bipul Khan Deputy Director and Head of Solutions Engineering,Technology at উপায় (UCB Fintech Company Limited)|MFS-DFS Architect|Micro-Service Architect|Financial Solution Architect|Blockchain Specialist.
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Monitoring is crucial for large systems for several reasons as follows Performance Optimization: Monitoring allows you to track the performance of various components and identify bottlenecks. It helps with Scalability Planning. Fault Detection and Diagnosis: Monitoring helps you detect and diagnose faults or failures in real time.Security Monitoring: Large systems are prime targets for cyberattacks, data breaches, and unauthorized access. Overall, monitoring plays a critical role in ensuring large systems' reliability, performance, security, and scalability. It enables proactive management, rapid problem resolution, and continuous optimization, ultimately contributing to the overall success and effectiveness of the system.
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- Yotam Kadishay Experienced Engineering Leader | Building Elite Teams and Innovative Products
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One more thing you need is the right infrastructure.Improving a distributed system will require careful, gradual release with feature flags.
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5 Here’s what else to consider
This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?
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Another aspect to consider is having the proper communication methodology to ensure the scale and required delivery semantics. This should also include recovery and minimizing damage, such as using DLQ, circuit breakers, etc.
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- Mahdi Azarboon Cloud Architect | Serverless | Content Developer
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Uncoordinated systems, wherein work items can be handled independently, scale the best. Note that coordination is not a binary feature but a spectrum.
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- Mahdi Azarboon Cloud Architect | Serverless | Content Developer
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Always stay responsive even during times of unexpected failures.Embrace uncertainty in your architecture, expect failure and design for resilience. Tailor consistency per component and use eventual consistency whenever possible.Scalability can be lifted by avoiding needless communication, coordination, and waiting.
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