high_scalability high_scalability-2008 high_scalability-2008-221 knowledge-graph by maker-knowledge-mining

221 high scalability-2008-01-24-Mailinator Architecture


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Introduction: Update: A fun exploration of applied searching in How to search for the word "pen1s" in 185 emails every second . When indexOf doesn't cut it you just trie harder. Has a drunken friend ever inspired you to create a first of its kind internet service that is loved by millions, deemed subversive by thousands, all while handling over 1.2 billion emails a year on one rickity old server? That's how Paul Tyma came to build Mailinator. Mailinator is a free no-setup web service for thwarting evil spammers by creating throw-away registration email addresses. If you don't give web sites you real email address they can't spam you. They spam Mailinator instead :-) I love design with a point-of-view and Mailinator has a big giant harry one: performance first, second, and last. Why? Because Mailinator is free and that allows Paul to showcase his different perspective on design. While competitors buy big Iron to handle load, Paul uses a big idea instead: pick the right problem and create a


Summary: the most important sentenses genereted by tfidf model

sentIndex sentText sentNum sentScore

1 If you don't give web sites you real email address they can't spam you. [sent-7, score-0.603]

2 Mailinator runs for months unattended and very few emails are lost, even under constant spam attacks and high peak loads. [sent-27, score-0.649]

3 The original flow of email handling was: - Sendmail received email in a single on-disk mailbox. [sent-39, score-0.785]

4 The system broke down because of disk contention between Mailinator and the email subsystem. [sent-46, score-0.52]

5 - The web application, the email server, and all email storage run in one JVM. [sent-48, score-0.75]

6 - On arrival each email passes through a filter system and is stored in RAM if all filters are passed. [sent-68, score-0.525]

7 Emails are compressed in RAM: - Since 99% of emails are never looked at, compressed email saves RAM. [sent-73, score-0.893]

8 - Mailinator can store about 80,000 emails in RAM, using under 300MB of RAM compared to the 20,000 emails which were stored in 1GB RAM in the original design. [sent-75, score-0.781]

9 When a web site asks you for an email address you can just enter an mailinator address. [sent-84, score-1.04]

10 Typing in the email address effectively creates the mailinator account. [sent-86, score-1.04]

11 To be accepted an email must pass the following filter chain: - Bounce: all bounced emails are dropped. [sent-92, score-0.839]

12 - IP: too much email from a single IP are dropped - Subject: too much email on the same subject is dropped - Potty: subjects containing words that indicate hate or crimes or just downright nastiness are dropped. [sent-93, score-1.004]

13 - When a sender reaches a threshold email count the sender is blocked. [sent-97, score-0.505]

14 - This filtering is a little more complex than IP blocking because you have to parse enough of the email to get the subject line and matching subject strings is a little more resource intensive. [sent-103, score-0.669]

15 - When something like 20 emails with the same subject within 2 minutes, all emails with that subject are then banned for 1 hour. [sent-104, score-0.996]

16 - Interestingly, subjects are not banned forever because that would mean Mailinator would have to track subjects forever and the system design is inherently transient. [sent-105, score-0.491]

17 At the cost of a few "bad" emails getting through the system is much simpler because no persistent list must be managed and that list surely would become a bottleneck. [sent-107, score-0.565]

18 - From my reading Mailinator filters only on IP and subject, so it doesn't have to read the body of the email body to accept or reject the email. [sent-110, score-0.579]

19 This slows down spammers who are trying to send out spam as fast as possible and may make them rethink sending email again to that address. [sent-114, score-0.628]

20 Keeping emails for a short period of time, allowing some SPAM to get through, and accepting less than 100% uptime create a strong vision for the system that help drive the design in all areas. [sent-129, score-0.651]


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wordName wordTfidf (topN-words)

[('mailinator', 0.62), ('email', 0.375), ('emails', 0.373), ('spam', 0.183), ('ip', 0.147), ('subject', 0.098), ('attacks', 0.093), ('disk', 0.081), ('smtp', 0.08), ('ram', 0.078), ('spammers', 0.07), ('design', 0.069), ('subjects', 0.068), ('paul', 0.067), ('reject', 0.067), ('resource', 0.066), ('sender', 0.065), ('system', 0.064), ('inbox', 0.059), ('sendmail', 0.057), ('banned', 0.054), ('period', 0.052), ('uptime', 0.051), ('filter', 0.051), ('zombie', 0.048), ('looked', 0.047), ('usage', 0.045), ('address', 0.045), ('goals', 0.045), ('would', 0.044), ('much', 0.044), ('compression', 0.044), ('addresses', 0.042), ('create', 0.042), ('survival', 0.041), ('must', 0.04), ('blocked', 0.04), ('forever', 0.04), ('resources', 0.039), ('robust', 0.038), ('original', 0.035), ('body', 0.035), ('filters', 0.035), ('memory', 0.033), ('compressed', 0.033), ('saves', 0.032), ('constraints', 0.032), ('accept', 0.032), ('filtering', 0.032), ('limited', 0.031)]

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