In order to search through this data companies like Facebook, Ebay, Yahoo, and Twitter use the freely available Hadoop software - a variant of MapReduce originally proposed by Google. Several database experts, however, criticize Hadoop for being inefficient.
Computer scientists from Saarland University (Germany) are now proposing a new system coined Hadoop++. It allows users to search through very large datasets much faster than before. Hadoop++ improves over Hadoop by up to a factor of 20.
Internet companies need to process data volumes on the order of millions of Gigabytes (Petabytes) on a daily basis. In order to search through this data effectively, Google proposed the MapReduce programming model. MapReduce divides the input data into smaller chunks that are then distributed over a large network of machines and processed in parallel. The open-source counterpart of MapReduce is called Hadoop. Even though Google holds a patent on MapReduce, it granted a license to Hadoop. Therefore, Hadoop may still be used by companies free of charge. However, "Database experts who are fluent in SQL consider MapReduce a major step backwards towards the database stone age", explains Jens Dittrich, Professor of Information Systems at Saarland University. He adds, "MapReduce disregards considerable wisdom from database research. As a consequence MapReduce is often slow and inefficient."
Despite this criticism, over the past years Hadoop has gained considerable attention from both industry and academia. Hadoop is very popular among programmers throughout the world. Professor Dittrich explains why, "The reason is its ease of use: the user neither has to learn a complex database language nor a data model. Furthermore, Hadoop is relatively easy to administrate. In summary, Hadoop allows even database-illiterate people to search through billions of records on very large computer clusters."
However, this comes at a price: "When compared to modern relational database management systems, Hadoop is just too slow." Therefore the researcher and his team at Saarland University have developed a new system, coined Hadoop++. It aims to eliminate the performance deficiencies encountered in Hadoop. The creativity of the new approach lies in how the problem is tackled: Hadoop++ works similarly to a "trojan", i.e. a computer virus which infects a computer system clandestinely and may then cause considerable harm. In contrast to these bad trojans, Hadoop++ injects hidden code into a system in order to "heal" it, ie. dynamically accelerating the underlying Hadoop. Professor Dittrich emphasizes, "One could say that Hadoop++ is a good trojan".
The Saarbrücken approach has the considerable advantage that Hadoop's tested code base does not have to be modified and retested. Thus, Hadoop++ avoids complex changes to a working system and unforeseen consequences. Hadoop++ will be presented at this year's International Conference on Very Large Databases (VLDB) - one of the world's most prestigious database conferences to be held in Singapore from September 13-17.
There have been heated discussions about the pros and cons of MapReduce/Hadoop when compared to traditional database management systems. This discussion was led by database professors in the US. Please refer to the links below for details. Recently there have been attempts to improve the runtime efficiency of MapReduce. However, as Professor Dittrich explains, "those attempts could not really marry MapReduce with database technology."
Press Pictures: www.uni-saarland.de/pressefotosFor questions, contact:
Friederike Meyer zu Tittingdorf | idw
Underwater acoustic localization of marine mammals and vehicles
23.11.2017 | IMDEA Networks Institute
NASA CubeSat to test miniaturized weather satellite technology
10.11.2017 | NASA/Goddard Space Flight Center
High-precision measurement of the g-factor eleven times more precise than before / Results indicate a strong similarity between protons and antiprotons
The magnetic moment of an individual proton is inconceivably small, but can still be quantified. The basis for undertaking this measurement was laid over ten...
Heat from the friction of rocks caused by tidal forces could be the “engine” for the hydrothermal activity on Saturn's moon Enceladus. This presupposes that...
The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.
Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
24.11.2017 | Physics and Astronomy
24.11.2017 | Health and Medicine
24.11.2017 | Earth Sciences