Big Data MDX with Mondrian and Apache Kylin

Sébastien JelschLondon, 7-11-2015

Big Data MDX with Mondrian and Apache Kylin

1Big Data MDX with Mondrian and Apache Kylin Sébastien Jelsch

Agenda

▪ OLAP-on-Hadoop with Apache Kylin

▪ Features

▪ Apache Kylin & Mondrian

▪ Conclusion & Discussion

Big Data MDX with Mondrian and Apache Kylin Sébastien Jelsch

Agenda


▪ Features



1


Big Data

Situation▪ More and more data becoming available on Hadoop▪ Limitations in existing Business Intelligence Tools

○ Limited support for Hadoop○ Data size growing exponentially○ High latency of interactive queries

▪ Challenges to adapt Hadoop for interactive analysis○ OLAP capability on Hadoop ecosystem not ready yet

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OLAP and Big Data

Goals▪ Full OLAP capability and advanced functionality▪ Interactive analysis in subseconds▪ ANSI SQL or MDX for analysts and engineers▪ Seamless integration with BI Tools▪ High concurrency with thousands of end users▪ Distributed and scale out architecture for large data volume

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What is Apache Kylin?

Solution:Apache Kylin

Extreme OLAP Engine for Big Data▪ Distributed Analytics Engine from eBay▪ OLAP-on-Hadoop▪ Provides SQL interface for multidimensional analysis▪ Based on Hadoop ecosystem

Open Source on: 1. October 2014Accepted into incubation: 25. November 2014Current version: 1.1 (25. October 2015)

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OLAP Cube


Short introduction into OLAP

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8 7 14

12 22 19

30 15 25Beer

Water

WineBerlin

Paris

London

20132014

2015


Apache Kylin: Architecture

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3rd Party App Web App BI Tools

REST Server

Query Engine

Routing

OLAPCube(HBase)OLAPCube(HBase)Metadata

Cube Build Engine

HiveHDFS

Star Schema Data Key Value Data

Mid Latency Low Latency

SQLSQL JDBC / ODBC


Agenda


▪ Features



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Apache Kylin: Cube Designer

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9



10



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Apache Kylin: Monitoring

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Apache Kylin: SQL Interface

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Agenda


▪ Features



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Apache Kylin and MDX

SQL returns 2-dimensional result setFor more dimensions SQL was not designed

Wish:▪ Multidimensional result set▪ Consider hierarchies and levels in the data

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Query Language: MDX


Pentahos Mondrian

Mondrian▪ OLAP Engine▪ Transforms MDX queries into SQL▪ Multidimensional representation of data▪ Integrated into Saiku / Pentahos Business Analytics Platform

▪ Expandable through SQL dialectse.g. MySQL, Postgres, Hive, Impala, ...

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Apache Kylin + Mondrian: Idea

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OLAP Client

Apache KylinHBase, Cuboids ...

MondrianMondrian Schema

MeasuresDimensionsHierarchiesLevelsAttributes

XMLMDX

JDBC

Kylin Dialect


Apache Kylin + Mondrian: Implementation

Work done:▪ Kylin dialect created▪ Optimized Kylins JDBC driver▪ Bugs fixed to get Mondrian working with Kylin

TBD:▪ Integrate Kylin dialect into Mondrians official code*▪ Make every MDX query executable

Successful tests**:▪ Current Saiku and Mondrian 4.4▪ Current Saiku and Mondrian 3.x (not tested very well)* Pull Request: https://github.com/pentaho/mondrian/pull/480** Github Project: https://github.com/mustangore/kylin-mondrian-interaction

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Apache Kylin + Mondrian: Examples

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Apache Kylin + Mondrian: Examples

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Agenda


▪ Features



22


Apache Kylin: Conclusion

▪ Extremely fast and scalable OLAP Engine▪ OLAP-on-Hadoop▪ Depends on Apache Hadoop infrastructure▪ MOLAP Cube▪ Incremental refresh of cubes▪ Integration into existing BI Tools▪ MDX queries with Mondrian possible (ongoing work)

23

Contact

Sébastien JelschBig Data Scientist

inovex GmbHOffice KarlsruheLudwig-Erhard-Allee 676131 Karlsruhe

Tel: +49 176 - 45786280E-Mail: [email protected]: @inovexgmbh | @Mustangore

Thank you for your attention


Introduction into OLAP

B1

1,1,1,0 1,1,0,1

1,1,1,1

1,0,1,1 0,1,1,1

0,1,1,0

1,0,0,0 0,1,0,0 0,0,1,0 0,0,0,1

0,0,0,0

0,0,1,10,1,0,11,0,0,11,0,1,01,1,0,0

Cube: All combinationsCuboid: One single combination

Number cuboids growing exponentially

0-Cuboid

N-Cuboid


Apache Kylin: Aggregation Groups

Problem: Number of Cuboids grows exponentiallyExample:Cube with 30 dimensionsNumber of Cuboids: 2³º > 1 billion

Solution: Partial CubeClassificate the OLAP Cube in Aggregation GroupsExample:30 dimensions splitted into 3 groups of 10 dimensionsNumber of Cuboids: 2¹º + 2¹º + 2¹º = 3072 << 1 billion

B2


Apache Kylin: Cube Build Process

B3

SourceHive Tables

HiveQL

DimensionDictionaries

Intermediate Hive Table

HiveQL MapReduce

HDFSSequenceFiles

N-Cuboid

(1)

(2) (3)


Apache Kylin: Cube Build Process

B4

MapReduce

N-Cuboid

HDFSSequenceFiles

N-1-Cuboid

HDFSSequenceFiles

0-Cuboid

HDFSSequenceFiles

... MapReduce

MapReduce

HFiles

HBase

Bulk Import

Big Data MDX with Mondrian and Apache Kylin

Software

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