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Headline Goes HereSpeaker Name or Subhead Goes Here

DO NOT USE PUBLICLY PRIOR TO 10/23/12

Building Analytical Applications on HadoopJosh Wills | Director of Data Science November 2012

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About Me

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What are ‘Analytical Applications?’

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The Humble Dashboard

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Crossfilter with Flight Information

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New York Times Electoral Vote Map

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New York Times Electoral Vote Map (Detail)

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Analytical Applications vs. Frameworks

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A Case Study

Developing Analytical Applications

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2012: The Predicting of the President

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RealClearPolitics

• Simple Average of Polls

• Transparent

• Simple Interactions

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FiveThirtyEight

• “Foxy” Model

• Opaque

• Simple Interactions with a richer UI

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Princeton Election Consortium

•Medians and Polynomials

• Transparent

• Rich Interactions

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How Did They Do?

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A Few of These, Because They’re Fun

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A Few of These, Because They’re Fun

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A Few of These, Because They’re Fun

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Here’s the Rub: One Expert Beat Nate

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Index Funds, Hedge Funds, and Warren Buffett

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A Brief Introduction to Hadoop

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Data Storage in 2001: Databases

• Structured schemas• Intensive processing

done where data is stored• Somewhat reliable• Expensive at scale

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Data Storage in 2001: Filers

• No schemas, stores any kind of file• No data processing

capability• Reliable• Expensive at scale

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And Then, This Happened

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Data Economics: Return on Byte

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Big Data Economics

• No individual record is particularly valuable• Having every record is

incredibly valuable• Web index• Recommendation systems• Sensor data• Market basket analysis• Online advertising

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Introduction to Hadoop

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The Hadoop Distributed File System

• Based on the Google File System• Data stored in large files

• Large block size: 64MB to 256MB per block• Blocks are replicated to

multiple nodes in the cluster

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Simple, Reliable Processing: MapReduce

• Map Stage• Embarrassingly parallel

• Shuffle Stage: Large-scale distributed sort• Reduce Stage

• Process all of the values that have the same key in a single step• Process the data where it is stored• Write once and you’re done.

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Developing Analytical Applications with Hadoop

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Novelty is the Enemy of Adoption

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The Best Way to Get Started: Apache Hive

• Apache Hive• Data Warehouse System on

top of Hadoop• SQL-based query language

• SELECT, INSERT, CREATE TABLE

• Includes some MapReduce-specific extensions

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Borrowing Abstractions

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Improving the UX (http://github.com/cloudera/impala)

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Moving Beyond the Abstractions

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Making the Abstract Concrete

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Cloudera’s Data Science Course

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Analytical Applications I Love

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The Experiments Dashboard

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Adverse Drug Events

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Gene Sequencing and Analytics

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The Doctor’s Perspective

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A Couple of Themes

1. Structure data the data in the way that makes sense for the problem.

2. Interactive inputs, not just interactive outputs.

3. Simpler interfaces that yield more sophisticated answers.

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Working Towards The Dream

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Moving Beyond MapReduce

Developing Analytical Applications

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The Cambrian Explosion…of Frameworks

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It’s Frameworks All The Way Down: Spark

• Developed at Berkeley’s AMP Lab• Defines operations on

distributed in-memory collections• Written in Scala• Supports reading to and

writing from HDFS

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IFATWD: Graphlab

• Developed at CMU• Lower-level primitives

• (but higher than MPI)• Map/Reduce =>

Update/Sort• Flexible, allows for

asynchronous computations• Reads from HDFS

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Playing with YARN

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BranchReduce (http://github.com/cloudera/branchreduce)

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