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At Facebook, we have unique storage scalability challenges when it comes to our data warehouse. Our warehouse stores upwards of 300 PB of Hive data, with an incoming daily rate of about 600 TB. In the last year, the warehouse has seen a 3x growth in the amount of data stored. Given this growth trajectory, storage efficiency is and will continue to be a focus for our warehouse infrastructure.
- Don’t wait for problems to find you
- Know your tools and your systems
- Prioritize, prioritize, prioritize
- Perform post mortems, but don’t get lost in them
- Document your work
- Fix the problem AND explain
- Make time for yourself
THE University of Nicosia (UNIC) has launched a six week, free and open enrolment online course called “Introduction to Digital Currencies”, aimed at anyone wishing to gain a greater understanding of the fundamentals of bitcoin and digital currency in general.
The MOOC (Massive Open Online Course) is due to start on May 15, with other sessions starting each month thereafter.
From xkcd, of course.
We shouldn’t think of “the web” as only what renders in web browsers. We should think of the web as anything transmitted using HTTP and HTTPS. Apps and websites are peers, not competitors. They’re all just clients to the same services.
HTTP Archive Viewer – a handy tool for troubleshooting web pages. Here is how to use it:
- Open Google Chrome browser (new tab).
- Press F12 to open Developer Tools.
- Switch to Network tab.
- Load any page in the tab.
- Right-click anywhere over network requests to get a menu.
- Select ‘Save as HAR with content’.
- Choose the location for the HAR file.
Now you can drag-n-drop this file into the HTTP Archive Viewer and study how the page loaded, which requests were made, how much time was spent and how it was spent. This is particularly useful for the following scenarios:
- You are about to make some changes to your site, and you want to compare ‘before’ and ‘after’.
- You are troubleshooting a session of a non-technical user, who can’t provide you access to his desktop environment.