Tag team: Visualization tools can be used with BigSheets to find patterns in unstructured data.
BigSheets has “a level of integration that I haven’t seen,” says Ben Lorica, a senior analyst in the research group at the technical publishing company O’Reilly Media. Traditionally, Lorica says, companies have split the functions that BigSheets performs into three separate tasks–Web crawling, data analysis, and visualizations. Because BigSheets is built on Hadoop, which is fundamentally designed to work on enormous quantities of data, Lorica says, “scale is not a problem” for BigSheets.
He cautions, however, that BigSheets is at an early stage and needs to be tested with other data. Since the technology is being developed in conjunction with particular partners of IBM, it’s unclear how easy it would be for a company start using it, he says. Setting up a Hadoop cluster can be a demanding task, he says, and if BigSheets isn’t packaged well, companies may find themselves needing an army of consultants to prepare the way for the tool.
The first test for BigSheets came at the British Library, which has been working since 2004 to create an archive of the roughly eight million UK websites. At regular intervals, the Library takes snapshots of Web pages, converts them to an archival file format, and stores them. But searching and analyzing this data is another challenge, and that’s where BigSheets came in.
In less than eight hours, Smith says, his team took 4.5 terabytes of archive files and processed them using a Hadoop cluster of four machines. With guidance from British Library researchers, the team used BigSheets to extract keywords, author information, and other metadata from these unstructured Web pages. They experimented with term frequency analysis and ran tag clouds and other visualizations.
The British Library researchers were able to adjust the kinds of metadata they were interested in over the course of the first day, focusing more on who had authored pages than they originally intended. Visualizations provided new insights. For example, using a tag cloud, the researchers discovered that the name of British political figure and writer Alastair Campbell was often misspelled as “Alistair,” surfacing large numbers of relevant records that could easily have been overlooked.
Eytan Adar, an assistant professor of information and computer science at the University of Michigan, who researches Internet-scale systems, text mining, and visualization, says that the tool could have a big impact. “Although the British Library’s content seems restricted to a few snapshots for each page, this still translates to a ton of data, and simply dumping search results in response to a query isn’t useful,” Adar says.
Adar has designed his own tool, called Zoetrope, for analyzing how Web pages have changed over time. BigSheets brings new insights, he says, by comparing data from many different pages as well as over time. Adar says that effective visualizations are “crucial for letting users quickly understand large collections of data.”
After further testing, IBM hopes to incorporate BigSheets into its existing services and products.