2 hadoop@e bay-hug-2010-07-21

@eBay Anil Madan amadan@ebay.com Analytics Platform Development

2007 Research Team Builds a 4 node Cluster
Subset of Click Stream and EDW data
Innovation with Mobius Query Language
Visualization and Click Path analysis
2009 Sept Search Clusters
Machine Learning Ranking cluster of 28 nodes
Search relevance cluster of 10 nodes
Subset of Click Stream and EDW Data
2010 May – Athena* Exploratory Cluster of 532 nodes
Platform Teams join hands with Search/Research to build a larger cluster .
Build it as a core competency for advanced insights for complex data
Rapid build-out with timelines pulled in by couple of months
* Athena, is the goddess of civilization, wisdom, strength, strategy, craft, justice and skill in Greek mythology
MIT's Athena ushered the world in a new era of distributed systems when it started in the mid 80s.

Infrastructure
Enterprise Nodes
Sun 64bit , Red Hat Linux
2 Quad Core Nehalem, 72GB RAM, 4TB
Servers
NameNode(s)
Job Tracker
Zookeeper
HBaseMaster
Ganglia Server
eBay (Cloudera) HUE
Data Nodes
SGI-Rackables, Cent OS, 1U , 5.3PB
2 Quad Core Nehalem, 36GB RAM, 10TB
Hbase on 20 nodes
Network
TOR 1Gbps
Core Switches uplink 40Gbps

Ecosystem Hadoop Core (HDFS,Common) MapReduce (Java, Streaming, Pipes,Scala) Data Access (Hbase, Pig, Hive) Tools & Libraries (HUE,UC4,Oozie.Mobius,Mahout) Monitoring & Alerting (Ganglia, Nagios)
MapReduce
Sourcing data primarily Java Applications using Perl, Scala, Python…
Data Access Frameworks
Hbase - for EDWdata
Pig – data piplelines
Hive – Adhoc queries MQL – Mobius Query Language
Monitoring & Alerting
Ganglia, Nagios
Tools
HUE/Mobius – lifecycle of user jobs UC4 - scheduling Oozie – user workflow and data pipelines
Mahout – data mining

Administration
Groups
Built to support multiple groups
Job invocation uses the group name
Fair Scheduler
Allocations based on investment
Weights
Minimum share of mappers and reducers
poolMaxJobsDefault
userMaxJobsDefault
defaultMinSharePreemptionTimeout
fairSharePreemptionTimeout
Auth & Auth
HUE – custom module to use corp. credentials
CLI*– PAM custom module
Security* - Implement token interface to replace Kerberos with SAML.
* Work in Progress

Data Sourcing Patterns Click Stream EDW Images Search Indices Analytics Reporting Algorithmic Models Acquisition Description Source Preparation Format Pattern Click Stream Session Event Session Container Session/Event Streamed as LZO/Text SessionContainer generate Sequence Files Session/Event Data Build an index and use LzoTextInputFormat for splits based on the work done by Johan Oskarsson/Twitter Session Container ‘Value to Type Conversion’ Pattern Secondary sort with reduce side join EDW Item Transaction User Feedback Bids Streamed as GZIP/Text Generate SequenceFile/ Hbase snapshot with previous day snapshot and current day data. Hive StorageHandlers to point to SequenceFile/Hbase snapshot
TotalOrderPartitoner with RandomSamplers to identify partition ranges for reducers.
Create Hbase regions using Hfile
Update RegionServers using ruby script loadtable.rb
Concerns - Hbase append performance, Hfile flush HBASE-1923

Search Use Case – Machine Learned Ranking ClickStream Items Users Feedback Classifiers Ranking Function Great Search Results
Goal
Enhance search relevance for eBay’s items.
Hadoop Usage
Build a ranking function that takes multiple factors into account like price, listing format, seller track record, relevance.
Ability to add new factors to validate hypothesis
.

Research Use Case – Description Data Mining
Goal
Extend catalog coverage
Hadoop Usage
Leverage data mining/machine learning techniques to create inventory into name value pairs
in an completely unsupervised way
BARBIE 1999 "PREMIERE NIGHT" Home Shopping Special Edition Gorgeous Doll With Beautiful Blond Hair / In A Gown Of Purple And Silver New / Never Removed From Box / Doll Is In Mint Condition / Remember This Beauty Is 11 Years Old Free Shipping To US Only / Will Ship International / Please E-mail For Cost Feel Free To Ask Me Any Questions Or Concerns Smoke - Free Environment Free Shipping Year: 1999 Model: premiere night Edition: home shopping special Hair: blond Gown: purple and silver Condition: new / never removed from box / mint

Platform Details Metrics Job Statistics, System/Disk Consumption, Utilization Infrastructure Publish/Subscribe ETL tools, low latency data movement Development Tools, Environment, IDE, Architecture Schemas, Metadata, Governance, Policies Operations Administration, Configuration, Monitoring Reporting Visualization, BI Generation, Information delivery Security User & Group Management, Auth & Auth Clusters Details Exploratory Strategic investment 1000-5000 nodes Production Site facing, low latency, high availability Use Case Specific Advertising, Trust & Safety , Merchandizing

Acknowledgments
Athena Team
Cloudera Inc.
Community

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2 hadoop@e bay-hug-2010-07-21

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