Intro to Apache Spark by CTO of Twingo

An Overview of Apache Spark
Ilya Gulman
CTO, Twingo
June, 2014

About Twingo
• A Big Data Company
• Established in 2006 by Golan Nahum
• 25 Employees
• Reseller and expert integrator in HP VERTICA
• Reseller and integrator in MAPR
• Reseller and expert integrator in MICROSTRATEGY
• Deep knowedge in Phyton and Linux
• We did more than 20 Big Data successful Projects
• Expertise in SAAS /OEM BIG DATA solutions

Agenda
• What is Spark?
• The Difference with Spark
• SQL on Spark
• Combining the power
• Real-World Use Cases
• Resources

Fast and general MapReduce-like engine
for large-scale data processing
• Fast
In memory data storage for very fast interactive queries
Up to 100 times faster then Hadoop
• General - Unified platform that can combine:
SQL, Machine Learning , Streaming , Graph & Complex
analytics
• Ease of use
Can be developed in Java, Scala or Python
• Integrated with Hadoop
Can read from HDFS, HBase, Cassandra, and any Hadoop
data source.
What is Spark ?

Spark is the Most Active Open
Source Project in Big Data
Projectcontributorsinpastyear
Giraph
Storm
Tez
0
20
40
60
80
100
120
140

Unified Platform
Shark
(SQL)
Spark Streaming
(Streaming)
MLlib
(Machine learning)
Spark (General execution engine)
GraphX (Graph
computation)
Continued innovation bringing new functionality, e.g.:
• Java 8 (Closures, Lamba Expressions)
• Spark SQL (SQL on Spark, not just Hive)
• BlinkDB (Approximate Queries)
• SparkR (R wrapper for Spark)

Supported Languages
• Java
• Scala
• Python
• SQL

Data Sources
• Local Files
– file:///opt/httpd/logs/access_log
• S3
• Hadoop Distributed Filesystem
– Regular files, sequence files, any other Hadoop
InputFormat
• Hbase
• Can also read from any other Hadoop data
source.

Easy and Fast Big Data
• Easy to Develop
– Rich APIs in Java, Scala,
Python
– Interactive shell
• Fast to Run
– General execution graphs
– In-memory storage
2-5× less code Up to 10× faster on disk,
100× in memory

Resilient Distributed Datasets (RDD)
• Spark revolves around RDDs
• Fault-tolerant collection of elements that can be
operated on in parallel
– Parallelized Collection: Scala collection which is run
in parallel
– Hadoop Dataset: records of files supported by
Hadoop
http://www.cs.berkeley.edu/~matei/papers/2012/nsdi_spark.pdf

RDD Operations
• Transformations
– Creation of a new dataset from an existing
• map, filter, distinct, union, sample, groupByKey, join, etc…
• Actions
– Return a value after running a computation
• collect, count, first, takeSample, foreach, etc…
Check the documentation for a complete list
http://spark.apache.org/docs/latest/scala-programming-guide.html#rdd-operations

RDD Code Example
file = spark.textFile("hdfs://...")
errors = file.filter(lambda line: "ERROR" in line)
# Count all the errors
errors.count()
# Count errors mentioning MySQL
errors.filter(lambda line: "MySQL" in line).count()
# Fetch the MySQL errors as an array of strings
errors.filter(lambda line: "MySQL" in line).collect()

RDD Persistence / Caching
• Variety of storage levels
– memory_only (default), memory_and_disk, etc…
• API Calls
– persist(StorageLevel)
– cache() – shorthand for
persist(StorageLevel.MEMORY_ONLY)
• Considerations
– Read from disk vs. recompute (memory_and_disk)
– Total memory storage size (memory_only_ser)
– Replicate to second node for faster fault recovery
(memory_only_2)
• Think about this option if supporting a web application
http://spark.apache.org/docs/latest/scala-programming-guide.html#rdd-persistence

Cache Scaling Matters
69
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30
12
0
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40
60
80
100
Cache
disabled
25% 50% 75% Fully
cached
Executiontime(s)
% of working set in cache

RDD Fault Recovery
RDDs track lineage information that can be used to
efficiently recompute lost data
msgs = textFile.filter(lambda s: s.startsWith(“ERROR”))
.map(lambda s: s.split(“t”)[2])
HDFS File Filtered RDD Mapped RDD
filter
(func = startsWith(…))
map
(func = split(...))

Interactive Shell
• Iterative Development
– Cache those RDDs
– Open the shell and ask questions
• We have all wished we could do this with MapReduce
– Compile / save your code for scheduled jobs later
• Scala – spark-shell
• Python – pyspark

Before Spark - Hive
• Puts structure/schema onto HDFS data
• Compiles HiveQL queries into MapReduce
jobs
• Very popular: 90+% of Facebook Hadoop
jobs generated by Hive
• Initially developed by Facebook

But.. Hive is slow
• Takes 20+ seconds even for simple
queries
• "A good day is when I can run 6 Hive
queries” – @mtraverso

Shark – SQL over Spark
• Hive-compatible (HiveQL, UDFs, metadata)
– Works in existing Hive warehouses without changing
queries or data!
• Augments Hive
– In-memory tables and columnar memory store
• Fast execution engine
– Uses Spark as the underlying execution engine
– Low-latency, interactive queries
– Scale-out and tolerates worker failures

Machine Learning - MLlib
• K-Means
• L1 and L2-regularized Linear Regression
• L1 and L2-regularized Logistic Regression
• Alternating Least Squares
• Naive Bayes
• Stochastic Gradient Descent
* As of May 14, 2014
** Don’t be surprised if you see the Mahout library converting to Spark soon

Comparison to Storm
• Higher throughput than Storm
– Spark Streaming: 670k records/sec/node
– Storm: 115k records/sec/node
– Commercial systems: 100-500k records/sec/node
0
20
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Throughputper
node(MB/s)
Record Size (bytes)
WordCount
Spark
Storm
0
20
40
60
100 1000
Throughputper
node(MB/s)
Record Size (bytes)
Grep
Spark
Storm

Combining the power
• Use Machine Learningg result as table.
GENERATE KMeans(tweet_locations)
SAVE AS TABLE tweet_clusters;
• Combine SQL, ML, and streaming (Scala)
val points = sc.runSql[Double, Double](
“select latitude, longitude from historic_tweets”)
val model = KMeans.train(points, 10)
sc.twitterStream(...)
.map(t => (model.closestCenter(t.location), 1))
.reduceByWindow(“5s”, _ + _)

Spark at Yahoo!
• Fast Machine Learning
Personalized news pages

Spark at Yahoo!
• Hive on Spark (Shark)
Using existing BI tools to view and query advertising
analytic data collected in Hadoop.
Any tool that plugs into Hive, like Tableau, automatically
works with Shark.

Spark at
• One of the largest streaming video companies
on the Internet
• 4+ billion video feeds per month
(second only to YouTube)
• CONVIVA uses Spark Streaming to learn
network conditions in real time

Remember
• If you want to use a new technology you must learn that
new technology
• For those who have been using Hadoop for a while, at
one time you had to learn all about MapReduce and how
to manage and tune it
• To get the most out of a new technology you need to
learn that technology, this includes tuning
– There are switches you can use to optimize your work

Configuration
http://spark.apache.org/docs/latest/
Most Important
• Application Configuration
http://spark.apache.org/docs/latest/configuration.html
• Standalone Cluster Configuration
http://spark.apache.org/docs/latest/spark-standalone.html
• Tuning Guide
http://spark.apache.org/docs/latest/tuning.html

Resources
• Pig on Spark
– http://apache-spark-user-list.1001560.n3.nabble.com/Pig-on-Spark-td2367.html
– https://github.com/aniket486/pig
– https://github.com/twitter/pig/tree/spork
– http://docs.sigmoidanalytics.com/index.php/Setting_up_spork_with_spark_0.8.1
– https://github.com/sigmoidanalytics/pig/tree/spork-hadoopasm-fix
• Latest on Spark
– http://databricks.com/categories/spark/
– http://www.spark-stack.org/

SparkContext sc = new SparkContext(master, appName, [sparkHome], [jars]);
JavaRDD<String> file = sc.textFile("hdfs://...");
JavaRDD<String> counts = file.flatMap(line -> Arrays.asList(line.split("
")))
.mapToPair(w -> new Tuple2<String, Integer>(w, 1))
.reduceByKey((x, y) -> x + y);
counts.saveAsTextFile("hdfs://...");
val sc = new SparkContext(master, appName, [sparkHome], [jars])
val file = sc.textFile("hdfs://...")
val counts = file.flatMap(line => line.split(" "))
.map(word => (word, 1))
.reduceByKey(_ + _)
counts.saveAsTextFile("hdfs://...")
Word Count
• Java MapReduce (~15 lines of code)
• Java Spark (~ 7 lines of code)
• Scala and Python (4 lines of code)
– interactive shell: skip line 1 and replace the last line with counts.collect()
• Java8 (4 lines of code)

Network Word Count – Streaming
// Create the context with a 1 second batch size
val ssc = new StreamingContext(args(0), "NetworkWordCount", Seconds(1),
System.getenv("SPARK_HOME"), StreamingContext.jarOfClass(this.getClass))
// Create a NetworkInputDStream on target host:port and count the
// words in input stream of n delimited text (eg. generated by 'nc')
val lines = ssc.socketTextStream("localhost", 9999, StorageLevel.MEMORY_ONLY_SER)
val words = lines.flatMap(_.split(" "))
val wordCounts = words.map(x => (x, 1)).reduceByKey(_ + _)
wordCounts.print()
ssc.start()

Deploying Spark – Cluster
Manager Types
• Standalone mode
– Comes bundled (EC2 capable)
• YARN
• Mesos

Intro to Apache Spark by CTO of Twingo

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