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926 high scalability-2010-10-24-Hot Scalability Links For Oct 24, 2010


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Introduction: On a cold and rainy Fall day, a day stolen from winter rather than our usual gorgeous Indian Summers , a day not even the SF Giants winning the pennant can help warm, here are some hot links to read by a digital flame:  Using MySQL as a NoSQL - A story for exceeding 750,000 qps on a commodity server by Yoshinori Matsunobu. Wonderfully detailed post on how you can lookup a row by ID really fast if you bypass all the typical MySQL query parsing overhead. Minecraftwiki.net and minecraftforum.net now serve more traffic than Slashdot and Stackoverflow!  1 million pageviews and 100k uniques  per day, per site; 10TB of bandwidth a month; 4+ machines running Varnish, HAProxy, PHP, MySQL, Nginx.  Stuff the Internet Says: @ old_sound : Somebody make me a t-shirt that says "I've read the CAP theorem and I liked it"  @dscape : How relevant do I think the CAP theorem is? Not at all. I honestly hate conversations where anyone talks about crap.. cap, sorry.  @humidbei


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1 Stuff the Internet Says: @ old_sound : Somebody make me a t-shirt that says "I've read the CAP theorem and I liked it"  @dscape : How relevant do I think the CAP theorem is? [sent-7, score-0.334]

2 I honestly hate conversations where anyone talks about crap. [sent-9, score-0.08]

3 Of the CAP theorem’s Consistency, Availability, and Partition Tolerance, Partition Tolerance is mandatory in distributed systems. [sent-19, score-0.077]

4 Instead of CAP, you should think about your availability in terms of  yield  (percent of requests answered successfully) and  harvest  (percent of required data actually included in the responses) and which of these two your system will sacrifice when failures happen. [sent-21, score-0.133]

5 NoSQL can be fully consistent, Cassandra didn't kill Digg, Tweets are still stored in MySQL, NoSQL doesn't offer unlimited scalability, and the object-relational impedance mismatch still lives in the heart of systems. [sent-23, score-0.084]

6 The crucial enabler for SDN is distributed control platform that shields developers from the details of the underlying physical infrastructure and allows them to write sophisticated control logic against a high-level API. [sent-36, score-0.164]

7 Kent Langley has rounded up a lot of good links to ZeroMQ . [sent-45, score-0.08]

8 Really cool scissors where you can set the blade length. [sent-48, score-0.084]


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Introduction: In many of the recent discussions on the design of large scale systems (a.k.a. Web Scale) it was argued that the right set of tradeoffs for building large scale systems would be to give away  C onsistency for  A vailability and  P artition tolerance. Those arguments relied on the foundation of the CAP theorem developed in early 2000-2002. One of the core principals behind the CAP theorem is that you must choose two out of the three CAP properties. In many of the transactional systems giving away consistency is either impossible or yields a huge complexity in the design of those systems. In this series of posts, I've tried to suggest a different set of tradeoffs in which we could achieve scalability without compromising on consistency. I also argued that rather than choosing only two out of the three CAP properties we could choose various degrees of all three. The degrees would be determined by the most likely availability and partition tolerance scenarios in our specific application.

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