An Introduction to Apache Pig
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An Introduction to Apache Pig



An Introduction to Apache Pig, what is it used for ?

An Introduction to Apache Pig, what is it used for ?
How does it work and why use it compared to Map Reduce
native code ?



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An Introduction to Apache Pig An Introduction to Apache Pig Presentation Transcript

  • Apache Pig ● What is it ? ● How does it work ? ● Why use it ? ● PigLatin Data Types ● PigLatin Maths ● PigLatin Example
  • Pig – What is it ? ● A high level language ● Used to analyse large data sets ● Used to create MapReduce jobs ● Abstracts definition of jobs ● Uses Pig Latin to define jobs ● Less code needed ● Compiles to MapReduce code
  • Pig – How does it work ? ● Three ways to use it – Grunt – Pig's interactive shell – Write Pig Latin in a script file – Embed Pig commands in another language ● Run modes – Local mode – single machine – Hadoop – run on a Hadoop/MapReduce cluster ● Creates MapReduce code automatically View slide
  • Pig – Why use it ? ● It is quicker ● It is data omnivorous ● It is easy to learn ● It is widely used ● Minor performance loss – Compared to native code ● It can be extended via user defined functions ( UDF ) View slide
  • PigLatin Data Types ● Int ● Long ● Float ● Double ● Chararray ● Bytearray ● Tuple ● Bag ● Map
  • PigLatin Maths Some of the built in maths functions ● ABS ● CEIL ● EXP ● FLOOR ● LOG ● ROUND ● SIN ● TAN
  • PigLatin Example Example borrowed from Wikipedia input_lines = LOAD '/tmp/my-copy-of-all-pages-on-internet' AS (line:chararray); -- Extract words from each line and put them into a pig bag -- datatype, then flatten the bag to get one word on each row words = FOREACH input_lines GENERATE FLATTEN(TOKENIZE(line)) AS word; -- filter out any words that are just white spaces filtered_words = FILTER words BY word MATCHES 'w+'; -- create a group for each word word_groups = GROUP filtered_words BY word; -- count the entries in each group word_count = FOREACH word_groups GENERATE COUNT(filtered_words) AS count, group AS word; -- order the records by count ordered_word_count = ORDER word_count BY count DESC; STORE ordered_word_count INTO '/tmp/number-of-words-on-internet';
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