Change of scene
| Scenes | Feature | Change point |
|---|---|---|
| old | Complex business logic | |
| new | A large number of concurrent users to access high | Software development methodology, process management, organizational structure change |
Vertical scaling
Improve server hardware configuration to support;
two questions:
- The upper limit of the physical server hardware performance;
- The cost of inputs with the performance increase is not linear;
Horizontal scaling
Use more servers to support the formation of clusters
Evolution distributed architecture
22 Cache
background
Distributed architecture, using most of the cache can optimize performance.
classification
Who operation according to the data source can be divided into two categories cache;
Access cache
Direct connection to the data source assembly cache and update the cache
scenes to be used:
- CDN deal with static resources;
- Reverse proxy caching dynamic resource
Bypass cache
Application directly connected to a data source to update the cache
scenes to be used:
- Local cache: jvm present in the stack data;
- Distributed Cache: routing algorithm, hash (key) / length, primarily through hash table;
Advantages and disadvantages
advantage:
- Respond faster, much faster than disk memory and remote access;
- Saving computing resources is a direct result of the cache;
- Can reduce the pressure, cdn web access can reduce the pressure, the reverse proxy can reduce the pressure on the database access
Disadvantages:
- Dirty read data; (expired and a failure notification process)
- Hot data difficult to recognize;
Clients can also use the cache, reducing access to static resources;
Concept stage
Development in Taiwan
| time | Development Description |
|---|---|
| 2008 | Taobao and Tmall duplication and waste of resources problem - "share a common part, platform |
| 2015 | supercell advanced mode (precipitated a universal material, algorithm) Ali began large and medium units, small reception organizational and operational mechanisms of transformation |
| 2017 | Ali, drops began to share experience in the construction stage, small and medium enterprises have begun, but encountered many problems |
| 2018 | baj started in Taiwan-based organizational structure change, the station completely hot up |
| 2019 | SMEs continue to build in Taiwan, but a lot of confusion, not to determine the theoretical system of knowledge, only some practical experience |
Why in the table so the fire?
I think the two big reasons:
First, the model benefits baj large enterprises, do, and have achieved good results;
second, change and development of SMEs encountered problems; summed up in three little points ;
pain point 1. SME information process, redundant construction (chimneys, silos of data), the station can solve the pain points;
2. SMEs in the face of economic development downstream, hope to their core competencies and maximize precipitation reuse, enterprise core competencies uncertainty facing market uncertainties;
3. SMEs in order to pursue sustained business growth, focus on the B-side (supply side), hoping to give their ability to assign more traditional industries.
summary
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By manual carefully you can learn:
1. Understand the evolution of distributed architecture;
2. Common classification of cache and the advantages and disadvantages;
Development and popular in Taiwan reasons 3. Analysis;
The original is not easy, please indicate the source, more than welcome to communicate
