Sinking in too many layers

Facebook engineers and analysts tap the company’s Hadoop clusters via a SQL-like query language known as Hive. [..]

Separate from its Hadoop work, Facebook built Cassandra, a distributed database also based on a piece of Google’s backend. Google uses a proprietary distributed database known as BigTable that runs atop the Google File System (GFS) system, and it published a paper on the technology in 2006. In echo of the Hadoop project, Facebook leaned on the paper in building Cassandra.

But Cassandra isn’t a pure BigTable mimic. Facebook applied BigTable’s data model to the Dynamo distributed storage system developed by Amazon for its S3 storage service, part of the retailer’s increasingly popular Web Services cloud. Cassandra’s authors included Avinash Lakshman, who helped build Dynamo at Amazon. Register

Computer architecture, power, and PHP

The Tile-Gx chips have 64-bit processing on their cores, and include floating point math instructions that allow a floating point operating to be done in five cycles instead of hundreds of cycles when done in software.

This is, believe it or not, important for PHP support, Ihab Bishara, director of cloud computing applications at Tilera, tells El Reg.

The Tile-Gx chips might support 64-bit processing, but physical memory addressing on the chips is either 39-bit or 40-bit, which works out to either 512GB or 1TB of maximum main memory. Each core burns less than a half watt of power. From the Register

All that work – to make PHP run faster and use less power.


VCs bailing on signed term sheets

Via Trevor Loy (not a bailer) this story

We’ve heard three stories in which lead investors bailed on rounds after term sheets were signed.


The first upset came last week from a WeWork Labs company. The startup’s lead investor pulled out of a $500,000 round.

Another entrepreneur raised between $3 and $4 million and thought he was in the clear. The money was invested, but there was a draw-back clause on the term sheet.  The investor retracted all of the money 30 days later.

Today, we heard from Rand Fishkin, cofounder of SEOMoz, who had $24 million taken back after term sheets were signed.

Fishkin says “everything was signed” with his investor in August

Read more:

People tend not to note the non-binding nature of term sheets – non-binding on one side.