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![Creating RDD (I)
Python
lines = sc.parallelize([“workshop”, “spark”])
Scala
val lines = sc.parallelize(List(“workshop”, “spark”))
Java
JavaRDD<String> lines = sc.parallelize(Arrays.asList(“workshop”, “spark”))](https://image.slidesharecdn.com/g1swsys5arkgcgldlnkw-signature-a13204c4a85e44629d87b7e854cf1c5e2354b59452c3641288adfff2d563d781-poli-160314074815/85/Apache-spark-Intro-10-320.jpg)
![Creating RDD (I)
Python
lines = sc.parallelize([“workshop”, “spark”])
Scala
val lines = sc.parallelize(List(“workshop”, “spark”))
Java
JavaRDD<String> lines = sc.parallelize(Arrays.asList(“workshop”, “spark”))](https://image.slidesharecdn.com/g1swsys5arkgcgldlnkw-signature-a13204c4a85e44629d87b7e854cf1c5e2354b59452c3641288adfff2d563d781-poli-160314074815/75/Apache-spark-Intro-10-2048.jpg)
More Related Content
Apache spark Intro
- 1.
- 2. Apache Spark Intro ★Apache Spark history ★ RDD ★ Transformations ★ Actions ★ Hands-on session
- 3.
- 4. From where tolearn Spark ? http://spark.apache.org/ http://shop.oreilly.com/product/0636920028512.do
- 5.
- 6. Easy ways torun Spark ? ★ your IDE (ex. Eclipse or IDEA) ★ Standalone Deploy Mode: simplest way to deploy Spark on a single machine ★ Docker & Zeppelin ★ EMR ★ Hadoop vendors (Cloudera, Hortonworks)
- 7.
- 8. Spark basics ★ RDD ★Operations : Transformations and Actions
- 9. RDD An RDD issimply an immutable distributed collection of objects! b c d ge f ih kj ml ona qp
- 10. Creating RDD (I) Python lines= sc.parallelize([“workshop”, “spark”]) Scala val lines = sc.parallelize(List(“workshop”, “spark”)) Java JavaRDD<String> lines = sc.parallelize(Arrays.asList(“workshop”, “spark”))
- 11. Creating RDD (II) Python lines= sc.textFile(“/path/to/file.txt”) Scala val lines = sc.textFile(“/path/to/file.txt”) Java JavaRDD<String> lines = sc.textFile(“/path/to/file.txt”)
- 12.
- 13. Other data structuresin Spark ★ Paired RDD ★ DataFrame ★ DataSet
- 14. Paired RDD Paired RDD= an RDD of key/value pairs user1 user2 user3 user4 user5 id1/user1 id2/user2 id3/user3 id4/user4 id5/user5
- 15. Spark operations RDD 1 RDD2 RDD 4 RDD 6 RDD 3 RDD 5 Action Transformation
- 16. Transformations RDD 1 RDD 2 Transformationsdescribe how to transform an RDD into another RDD. RDD 1 RDD 2
- 17. Transformations RDD 1 RDD {1,2,3,4,5,6} MapRDD {2,3,4,5,6,7} FilterRDD {1,2,3,5,6} map x=> x +1 filter x => x != 4
- 18. Popular transformations ★ map ★filter ★ sample ★ union ★ distinct ★ groupByKey ★ reduceByKey ★ sortByKey ★ join
- 19. Actions Actions compute aresult from an RDD ! RDD 1
- 20. Actions InputRDD {1,2,3,4,5,6} MapRDD {2,3,4,5,6,7} FilterRDD {1,2,3,5,6} map x =>x +1 filter x => x != 4 count()=6 take(2)={1,2} saveAsTextFile()
- 21. Popular actions ★ collect ★count ★ first ★ take ★ takeSample ★ countByKey ★ saveAsTextFile
- 22.
- 23.
- 24. Transformations and Actions users administrators filter() take(3)saveAsTextFile() persist()
- 25.
- 26. How Spark ExecutesYour Program
- 27.
- 28. MovieLens MovieLens data setswere collected by the GroupLens Research Project at the University of Minnesota. This data set consists of: * 100,000 ratings (1-5) from 943 users on 1682 movies. * Each user has rated at least 20 movies. * Simple demographic info for the users (age, gender, occupation, zip) Download link : http://grouplens.org/datasets/movielens/
- 29.
- 30. Exercises already solved! ★ Return only the users with occupation ‘administrator’ ★ Increase the age of each user by one ★ Join user and rating datasets by user id
- 31. Exercises to solve ★How many men/women register to MovieLens ★ Distribution of age for male/female registered to MovieLens ★ Which are the movies names with rating x? ★ Average rating by movies ★ Sort users by their occupation
- 32. Congrats if youreached this slide
Editor's Notes
- #2 As a BigData/DataScience community, we did a series of workshops (ex. How to think in MapReduce, Hive, Machine Learning) and meetups with the goals to meet and know each other and to grow the knowledge in this fields. I saw that more and more companies from Cluj start to play with this kind of technologies, so if you like it, I believe that very shortly you will work on some very cool and challenging projects. first goal is to see how easy you can start working with Spark second goal is see and try Spark main functionalities OR in the next two hours we are gonna show you how easy is to start working with Spark, first how you can use just only your IDE (Eclipse or Idea) to work with Spark without any cluster deployment and second, of course, we are gonna describe Spark main functionalities and try some practical examples
- #3 how spark really works : https://www.quora.com/What-exactly-is-Apache-Spark-and-how-does-it-work https://spark.apache.org/research.html
- #7 change them with EMR, Hadoop vendors (Cloudera, Hortonworks) or standalone, or just in your IDE
- #10 RDD is the core concept in Spark a Spark program is based on creating an RDD, transforming on RDD or performing an action on RDD to get the results another RDD definition : “RDD is fault-tolerant collection of elements distributed across many servers on which we can perform parallel operations.” TODO why RDD is immutable ? (concurrency stuff ? )
- #11 spark provide two ways to create RDDs : loading an external dataset and parallelizing a collection
- #12 spark provide two ways to create RDDs : loading an external dataset and parallelizing a collection
- #13 NOTES user can specify rdd priority, specifying which rdd to be first splitted to disk if the memory start to fill.
- #14 paired rdd - an RDD made of tuple objects DataFrame - an RDD made of Rows and has associated a schema (similar with tables in SQL) DataSet - combine the bests from RDDs and DataFrames
- #16 - explain this DAG using a example, (filter log files) - explain lazy initialization - explain fault tolerance Notes : rdd do not need to be materialized at all times, it has enough information (its lineage) to be computed from data in a stable storage corse grained transformation restrict RDD to appliations which do bulk writes operations but give an easy fault-tolerant strategy
- #29 for this workshop we choose MovieLens dataset to play with. Using this dataset we will learn how to read files with spark, create RDDs and apply common transformations and actions on them. the dataset contains three files : user, rating and movies.