Steve Jobs resigns as CEO of Apple

This is the letter from Steve Jobs himself:

To the Apple Board of Directors and the Apple Community:
I have always said if there ever came a day when I could no longer meet my duties and expectations as Apple’s CEO, I would be the first to let you know. Unfortunately, that day has come.
I hereby resign as CEO of Apple. I would like to serve, if the Board sees fit, as Chairman of the Board, director and Apple employee.
As far as my successor goes, I strongly recommend that we execute our succession plan and name Tim Cook as CEO of Apple.
I believe Apple’s brightest and most innovative days are ahead of it. And I look forward to watching and contributing to its success in a new role.
I have made some of the best friends of my life at Apple, and I thank you all for the many years of being able to work alongside you.
Steve

Apple has confirmed that Apple COO Tim Cook will replace Jobs as CEO, following Jobs’ own recommendation. Considering that Cook has filled in for Jobs in the times of his medical leaves (including the one he has been on this year), this kept everyone wondering if and when it came time for Jobs to step down.

Also as requested, Jobs has been elected as Chairman of the Board and will remain with the company in that capacity. Cook will join the Board as well.

Facebook has just moved 30 petabytes of Hadoop data

Facebook, a huge Hadoop user, has just moved its whopping 30-petabyte cluster from one data center to another.

FYI:
1 Petabyte (PB) = 1.024 Terabytes (TB) = 1.048.576 Gigabytes (GB)

The move was necessary because Facebook had run out of both power and space to expand the cluster — very likely the largest in the world — and had to find it a new home. Facebook’s data team undertook a multi-step process to copy over data, trying to ensure that any file changes made during the copying process were accounted for before the new system went live.

Unlike a traditional warehouse using SAN/NAS storage, HDFS-based warehouses lack built-in data-recovery functionality. They showed that it was possible to efficiently keep an active multi-petabyte cluster properly replicated, with only a small amount of lag.

For Facebook, though, it looks like its fast-growing Hadoop data warehouse is just part of a larger trend toward needing more space. Recently, Facebook confirmed it’s building a second data center in Prineville, Ore., next to its existing one. That will make three for the company, which also is building a data center in Forest City, N.C.