High Concurrency Crawler Architecture Design Core Elements

First, why reptiles are always pinched? First understand the rules of the game

Crawler brothers have experienced, at the beginning of the data collection, after two days suddenly become404 ProfessionalIt's like a gopher. It's like whack-a-mole, the harder you poke, the thicker the shield. The underlying logic is one sentence:The server to see your IP access too often, directly pull the black no negotiation!The

For example, if you knock on the door of your neighbor's house for 10 minutes in a row, they will definitely call the police. Instead of a server, it detects high-frequency access from the same IP and directly blocks ports. This time you need toGet a bunch of stand-ins to take turns knocking on doors.--This is the core value of proxy IP.

Second, high-concurrency crawlers three major destiny

1. IP pool live water circulation(more clearly in a table)

Here's the kicker."living water effect" (i.e. benefit from the effects of climate change): ipipgo's dynamic IP pool can automatically replace 200+ IPs every 5 minutes, which is 8 times more efficient than traditional static pools. It's like installing a revolving door for the crawler, IP in and out simply can't stop.

2. Pacing of requests

Never set the concurrency toelectrocardiogram (ECG) mode(fluctuating highs and lows). It is recommended to usePulsed request: Probe with 20 concurrency first, increase 10 concurrency every 30 seconds, and step back down after hitting the threshold. This tawdry operation can make the target server mistake it for natural traffic.

3. Abnormal fusion mechanisms

I've seen too many crawlers deadlocked IP, and finally the whole disk collapsed. Reliable practice is: when a single IP for three consecutive requests failed, immediately kicked out of the current task queue, ipipgo's service will automatically fill the new IP, the whole process is less than 0.8 seconds.

III. Guide to avoiding pitfalls in actual combat

Recently, I helped an e-commerce company to do competitor monitoring, and they were blocked 200+ IPs per day when they were doing it themselves. ipipgo was used to do it.Intelligent Routing PolicyAfter that, three key adjustments:

1. Expand User-Agent pool from 50 to 2000+
2. Limit access to 15 pages per IP life cycle
3. 加入2-8秒的随机

As a result, the amount of data acquisition directly tripled, and the operation and maintenance brother no longer need to get up at 3:00 a.m. to change the IP.

IV. Soul torture QA

Q: What should I do if I always encounter CAPTCHA?
A: With ipipgo's high stash of IP + Chrome headless mode combination, can reduce the CAPTCHA trigger rate of 70%. really can't get around on the coding platform, don't die with the CAPTCHA.

Q: Can't get the data crawl speed up?
A: Check whether the proxy IP bandwidth dragged behind, ipipgo's BGP line can run up to 500Mbps, more than 20 times faster than the ordinary home wide.

Q: What should I do if I need to crawl domestic and foreign websites at the same time?
A: Check directly in the backend of ipipgoMixed geographic patternsIn addition, the best lines are automatically assigned. For example, if you climb Amazon, you can cut the IP of Europe and the United States, and if you engage in Taobao, you can cut the IP of the domestic server room.

V. Speak the truth

I have seen too many teams in the hardware on the money, but can not afford to spend a small amount of money to get a proxy IP. the result is that the server configuration of tens of thousands of dollars, the efficiency of the crawler is not as good as the script written by college students. To say a word of offense:High concurrency without the support of a reliable proxy IP is like filling water with a leaky spoon.The

Lastly, I'd like to introduce my own product: ipipgo has recently gone live!Traffic Trial PackThe new users will receive 5G of traffic for free. Especially suitable for small teams that need to quickly verify the program, after all, practice makes perfect, just look at the tutorials do not manipulate are hooligans.

(concluded)