One is the creator of Brtfs, Chris Mason, who is leaving Fusion-io which he joined recently. Mason was an employee of Oracle before he joined Fusion-io.
The other Btrfs hacker who is joining Facebook is Josef Bacik, also an employee of Fusion-io. Prior to Fusion-io, Bacik worked for Red Hat.
"Fusion-io has been a great place to work, but I've decided it is time to move on," Mason wrote in an email to the Btrs mailing list. "I'm leaving for Facebook, where I'll continue to focus on Linux kernel development. Facebook is also very interested in helping to improve Btrfs."
Bacik wrote: "Starting next week I will be working for Facebook on their kernel team. Fusion-io has been awesome this last year and a half but I've decided now is a good time to move on and try new things.
"Facebook is committed to the success of Btrfs so not much will change as far as my involvement with the project, I will still be maintaining btrfs-next and working on stability."
Development of Btrfs was begun at Oracle in 2007. The SUSE Linux company has shown great interest in making this filesystem the default for its community and enterprise distributions.
Mason told iTWire that he had been aware of the fact that Bacip was also moving to Facebook.
Asked why he had moved, so soon after leaving Oracle and joining Fusion-io - he joined Fusion-io in June 2012 - Mason replied: "As much as I've enjoyed working at Fusion-io, Facebook was just a great opportunity. They have amazing infrastructure and a strong developer culture."
He said he did not know of any other Btrfs hackers who would be making a similar move. "I'd love to see more people join, but I don't know of anyone right now," he said.
Image: Courtesy Btrfs wiki