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MapReduce is a programming model and an associated implementation for processing and generating big data sets with a parallel and distributed algorithm on a cluster. [1] [2] [3]A MapReduce program is composed of a map procedure, which performs filtering and sorting (such as sorting students by first name into queues, one queue for each name), and a reduce method, which performs a summary ...
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
RCFile became the default data placement structure in Facebook's production Hadoop cluster. [2] By 2010 it was the world's largest Hadoop cluster, [3] where 40 terabytes compressed data sets are added every day. [4] In addition, all the data sets stored in HDFS before RCFile have also been transformed to use RCFile . [2]
In chemistry, azide (/ ˈ eɪ z aɪ d /, AY-zyd) is a linear, polyatomic anion with the formula N − 3 and structure − N=N + =N −.It is the conjugate base of hydrazoic acid HN 3. Organic azides are organic compounds with the formula RN 3, containing the azide functional group. [1]
C 2 2− dicarbide(2−) (or acetylide as an acceptable name) S 2 2− disulfide(2−) or sometimes as an alternative derived from a substitutive name e.g. S 2 2− disulfanediide; Polyatomic anions made up of different elements are named either substitutively or additively, the name endings are -ide and -ate respectively e.g. :
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For example, the main constituent of white vinegar is CH 3 COOH, which is commonly called acetic acid and is also its recommended IUPAC name, but its formal, systematic IUPAC name is ethanoic acid. The IUPAC's rules for naming organic and inorganic compounds are contained in two publications, known as the Blue Book [1] [2] and the Red Book, [3 ...
For example, to remember the first 8 digits of Pi, using the major system as well: 3: Picture a monkey walking on the Sun. 1: Picture a dog jumping over a shoe. 4: Picture a bottle of rum hanging from a tree. 1: Picture a tube connecting to a door. 5: Picture bees flying from a cup of lemonade as if it is a hive.