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Facebook

Submission + - Facebook Turns to Visualization to Manage Bad Servers (slashdot.org)

Nerval's Lobster writes: "How do Facebook engineers manage hundreds of servers and racks without getting lost in all that data? By visualizing it, of course.

In a corporate blog posting Sept. 19, Facebook application operations engineer Sean Lynch revealed the development of a tool, “Claspin,” which generates a heat map of the company’s numerous racks and servers—the better to determine which are “bad” and in need of repair.

According to Lynch, Facebook originally set out to manage the health of its computing resources via two tools: Memcache, and TAO, a caching graph database that performs its own MySQL queries. While the TAO tool generates reams of data from servers and clients, all of it collected into dashboards showing various latency and error rate statistics, it started giving Facebook engineers some scalability issues.

In the wake of that, Lynch turned to creating a tool that could generate lists of hosts, each with rankings for the number of timeouts, for example, or TCP retransmits. The resulting tool listed each server in a tuple, or an ordered list of elements. But the solution was also text-heavy and required a somewhat-trained operator to manage the problem—in that case, Lynch himself. So Lynch settled on a heatmap, with each “pixel” representing a host."

Windows

Submission + - Nokia CEO has 'a few months' left to make Lumia a success (bgr.com)

zacharye writes: Nokia’s turnaround isn’t going as smoothly as many had hoped and it now looks as though investors and industry watchers are starting to get restless. The struggling Finnish smartphone vendor has lost more than $1 billion in each of the three most recent quarters. Nokia managed to ship 4 million Lumia smartphones last quarter, but it continued to lose market share as Google’s (GOOG) Android OS and Apple’s (AAPL) iPhone dominated the global market. Investors have been treated to a few unexpected surprises, but some are beginning to lose patience with Nokia CEO Stephen Elop as questions surrounding whether or not Microsoft’s 2-year-old mobile OS will ever manage to make a dent in the smartphone market continue to be raised...

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