Spark Workshop

1. Navid Kalaei
Fatemeh Jamali
Dr. Esmaeili
Winter 2018

2. Contents:
• Spark
• Frameworks
• Ecosystem
• Resilient Distributed
Datasets(RDD)
• A Simplified Data
Flow
• Executors
• Iterative Operations
• Fault-tolerance
• Comparisons
• Who uses Spark?!
• Datasets
• DataFrame
• Scala
• Practices
• Pi Estimation
• Spark Stream
• Practice
• Compile and Deploy
• Spark SQL
• PageView
• References
2

3. Spark
 Apache Spark™ is a unified analytics engine for
large-scale data processing.
 Created by AMPLab now Databricks
 Written in Scala
 Licensed under Apache
 Lives in Github
3

4. Frameworks
4

5. Ecosystem
Hadoop Spark
Hive SparkSQL
Apache Mahout MLLib
Impala SparkSQL
Apache Giraph Graphax
Apache Storm Spark streaming
5

6. Resilient Distributed
Datasets
 RDD is a fundamental data structure of Spark
stored in memory.
 It is an immutable distributed collection of objects.
 Each dataset in RDD is divided into logical
partitions, which may be computed on different
nodes of the cluster.
6

7. Resilient Distributed
Datasets
 RDDs can contain any type of Python, Java, or
Scala objects, including user-defined classes.
 Formally, an RDD is a read-only, partitioned
collection of records.
 RDD is a fault-tolerant collection of elements that
can be operated on in parallel.
7

8. A Simplified Data Flow
8

9. Executors
9

10. Iterative Operations
MapRedu
ce
Spark
10

11. Fault-tolerance
 RDDs are remember
the sequence of
operations that
created it from the
original fault-tolerant
input data
 Batches of input data
are replicated in
memory of multiple
worker nodes,
therefore fault-tolerant
 Data lost due to
worker failure, can be
11

12. Breaking the Records!
Hadoop MR
Record
Spark
Record
Spark
1 PB
Data Size 102.5 TB 100 TB 1000 TB
Elapsed Time 72 mins 23 mins 234 mins
# Nodes 2100 206 190
# Cores 50400 physical 6592 virtualized 6080 virtualized
Cluster disk
throughput
3150 GB/s
(est.)
618 GB/s 570 GB/s
Sort Benchmark
Daytona Rules
Yes Yes No
Network dedicated data
center, 10Gbps
virtualized
(EC2) 10Gbps
network
virtualized
(EC2) 10Gbps
network
Sort rate 1.42 TB/min 4.27 TB/min 4.27 TB/min
Sort rate/node 0.67 GB/min 20.7 GB/min 22.5 GB/min
12

13. Performance
Word
Count
13

14. Performance
PageRan
k
14

15. Salary Comparison
15

16. Who uses Spark?!
16

17. Spark SQL and DataSet
 Spark SQL is a Spark module for structured data
processing
 Spark SQL uses this extra information to perform
extra optimizations
 Dataset is a new interface that provides the
benefits of RDDs with the benefits of Spark SQL’s
optimized engine
17

18. DataFrame
 A DataFrame is a Dataset organized into named
columns
 It is conceptually equivalent to a table in a
relational database or a data frame in R/Python
 It benefits from richer optimizations under the
hood
18

19. Scala
 Scala combines object-oriented and functional
programming in one concise high-level language.
 Scala's static types help avoid bugs in complex
applications
 Its JVM and JavaScript runtimes let you build
high performance systems
 It has an easy access to huge ecosystems of
libraries.
19

20. Practices
 WordCount
 Pi Estimation
 Text Search
20

21. Pi Estimation
∏
4
1
1
21

22. What is streaming?
22

23. Spark Stream
 Framework for large scale stream processing
 Scales to 100s of nodes
 Provides a simple batch-like API for
implementing complex algorithm
23

24. Stream Processing
24
 Run a streaming computation as a series of
very small, deterministic batch jobs
 Chop up the live stream into batches of X
seconds
 Spark treats each batch of data as RDDs and
processes them using RDD operations

25. Practices
25
 Run “Stateless NetworkWordCount”
 Compile Deploy a java file
 Run “Stateful NetworkWordCount”
 Run “PageView” and it’s generator
 Execute simple data operations with Spark SQL

26. Compile and Deploy
26
Compile
1. Generate project with Maven
2. Copy the Java file to the end point
3. Edit the pom.xml
4. Package the project
Deploy
1. Submit the .jar file to Spark

27. Apache Maven
27
 Maven is a tool that can now be used for building
and managing any Java-based project
 Making the build process easy
 Providing a uniform build system
 Providing quality project information
 Providing guidelines for best practices
development
 Allowing transparent migration to new features

28. pom.xml
28
 Contains project identifiers
 Defines source and target versions of Java to be
used
 Dependencies are subjected from Maven’s
repository

29. Let’s Compile and Deploy!
29

30. PageView
 The aim is to analyze hit and miss ratio of a
website
 The generator simulates 100 users from 2
regions on 10 threads
 Hit rate: 95%
30
100Users
• 94709
• 94117
Zip
Codes
• /index
0.7
• /news
0.2
• /contact
0.1
Pages

31. Spark SQL
31
 The Spark master node connects to relational databases and
loads data from a specific table or using a specific SQL query.
 The Spark master node distributes data to worker nodes for
transformation
 The Worker node connects to the relational database and writes
data
 The user can choose to use row-by-row insertion or bulk insert

32. References
 [1]: Apache Spark officially sets a new record in
large-scale sorting
 [2]: 2014 Data Science Salary Survey
 [3]: The Performance Comparison of Hadoop and
Spark
 [4] Apache Maven Project
 [5] The Scala Programming Language
32