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Apache Kylin – Cubes on Hadoop
1.
© 2014 MapR
Technologies 1© 2014 MapR Technologies
2.
© 2014 MapR
Technologies 2 Who I am Ted Dunning, Chief Applications Architect, MapR Technologies Email tdunning@mapr.com tdunning@apache.org Twitter @Ted_Dunning VP Incubator Email tdunning@apache.org Twitter @ApacheMahout @ApacheDrill Credit for slides to Luke Han and the Kylin dev team
3.
© 2014 MapR
Technologies 3 Kylin Committers ankur Ankur Bansal jiangxu Jiang Xu liyang Li Yang lukehan Luke Han* mahongbin Hongbin Ma xduo Xiaodong Duo yisong George Song jhyde Julian Hyde The real deal Calcite plenipotentiary
4.
© 2014 MapR
Technologies 4 Agenda • What is Apache Kylin? • Features & Tech Highlights • Performance • Roadmap • Q & A
5.
© 2014 MapR
Technologies 5 What is Kylin? Extreme OLAP Engine for Big Data Kylin is an open source Distributed Analytics Engine from (originally from eBay) that provides SQL interface and multi-dimensional analysis (OLAP) on Hadoop for extremely large datasets kylin / ˈkiːˈlɪn / 麒麟 --n. (in Chinese art) a mythical animal of composite form • Open Sourced on Oct 1st, 2014 • Accepted into incubation November, 2014 • Preparing for first Apache release
6.
© 2014 MapR
Technologies 6 Big Data Obligatory Slide • More and more data becoming available on Hadoop • Limitations in existing Business Intelligence (BI) Tools – Limited support for Hadoop – Data size growing exponentially – High latency of interactive queries – Scale-Up architecture • Challenges to adopt Hadoop as interactive analysis system – Majority of analyst groups are SQL savvy – No mature SQL interface on Hadoop – OLAP capability on Hadoop ecosystem not ready yet
7.
© 2014 MapR
Technologies 7 Goals • Sub-second query latency on billions of rows • ANSI SQL for both analysts and engineers • Full OLAP capability to offer advanced functionality • Seamless Integration with BI Tools • Support for high cardinality and dimensionality • High concurrency – thousands of end users • Distributed and scale out architecture for large data volume
8.
© 2014 MapR
Technologies 8 Possible Strategies • Build from scratch – A grand tradition – Large-scale SQL support is much harder than it looks – Huge level of distraction • Patch Hive – Not feasible due to design assumptions in Hive – Weak optimizer – Hive isn’t standard SQL anyway – (but isn’t Hive moving to Calcite?)
9.
© 2014 MapR
Technologies 9 Kylin’s Strategy • Use Calcite as SQL core – Real SQL – Real cost-based optimizer – Already in Apache – Provides linkage to Apache Drill and future of Hive • Build cubes externally – Don’t care which tools, currently Hive, soon Spark • Use Calcite’s Rex interpreter – Assumes final aggregations fit on one machine • Possibly integrate with Drill at some point for parallel execution
10.
© 2014 MapR
Technologies 10 Transaction Operation Strategy Analytics Query Taxonomy High Level Aggregation • Very High Level, e.g GMV by site by vertical by weeks Analysis Query • Mid-level, e.g GMV by site by vertical, by category (level x) past 12 weeks Drill Down to Detail • Detail Level (Summary Table) Low Level Aggregation • First Level Aggregation Transaction Level • Transaction Data OLAP Kylin is designed to accelerate 80+% of analytics queries on Hadoop OLTP
11.
© 2014 MapR
Technologies 11 Technical Challenges • Huge volume data – Table scan • Big table joins – Data shuffling • Analysis on different granularity – Runtime aggregation expensive • Map Reduce job – Batch processing
12.
© 2014 MapR
Technologies 12 How Cubes Work • Start with a simple table – revenue,time,item,location,supplier • Build a table of aggregates for every combination of fields select sum(revenue), max(revenue), supplier from tbl group by time,item,location; select sum(revenue), max(revenue), location,supplier from tbl group by time,item; select sum(revenue), max(revenue), location from tbl group by time,item,supplier; … • Then transform queries using appropriate magic select sum(revenue), city from tbl join location_details where state = ‘MN’ group by city select … from (select sum(),location from cube) join location_details where state = ‘MN’ group by city
13.
© 2014 MapR
Technologies 13 How Cubes Don’t Work • Total number of cubes is exponential in columns • High cardinality can result in large cubes • Skewed data can make cubes larger as original data • Magic may be insufficient to recognize cubable queries • Keeping cubes up to date can be hard • Forget OLTP thoughts like pervasive transactions
14.
© 2014 MapR
Technologies 15 OLAP Cube – Balance between Space and Time Base vs. aggregate cells; ancestor vs. descendant cells; parent vs. child cells 1. (9/15, milk, Urbana, Dairy_land) - <time, item, location, supplier> 2. (9/15, milk, Urbana, *) - <time, item, location> 3. (*, milk, Urbana, *) - <item, location> 4. (*, milk, Chicago, *) - <item, location> 5. (*, milk, *, *) - <item> Cuboid = one combination of dimensions Cube = all combinations of dimensions 1111 0111 1011 1101 1110 0011 0101 0110 1001 1010 1100 0001 0010 0100 1000 0000
15.
© 2014 MapR
Technologies 16 From Relational to Key-Value
16.
© 2014 MapR
Technologies 17 Kylin Architecture Overview 17 Cube Build Engine (MapReduce…) SQL Low Latency - SecondsMid Latency - Minutes Routing 3rd Party App (Web App, Mobile…) Metadata SQL Tools (BI Tools: Tableau…) Query Engine Hadoop Hive REST API JDBC/ODBC Online Analysis Data Flow Offline Data Flow Clients/Users interactive with Kylin via SQL OLAP Cube is transparent to users Star Schema Data Key Value Data Data CubeOLAP Cube (HBase) SQL REST Server
17.
© 2014 MapR
Technologies 18 Kylin Depends on Hadoop Eco-system • Hive – Input source, pre-join star schema during cube building • MapReduce – Aggregate metrics during cube building • HDFS – Store intermediate files during cube building • HBase – Store and query data cubes • Calcite – SQL parsing, code generation, optimization
18.
© 2014 MapR
Technologies 19 Agenda • What is Apache Kylin? • Features & Tech Highlights • Performance • Roadmap • Q & A
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© 2014 MapR
Technologies 20 Kylin Highlights • Extremely Fast OLAP Engine at Scale Kylin is designed to reduce query latency on Hadoop for 10+ billions of rows of data to seconds • ANSI SQL Interface on Hadoop Kylin offers ANSI SQL on Hadoop and supports most ANSI SQL query functions • Seamless Integration with BI Tools Kylin currently offers integration capability with BI Tools like Tableau. • Interactive Query Capability Users can interact with Hadoop data via Kylin at sub-second latency • MOLAP Cube User can define a data model and pre-build in Kylin with more than 10+ billions of raw data records
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Technologies 21 More Highlights • Compression and Encoding Support • Incremental Refresh of Cubes • Approximate Query Capability for distinct Count (HyperLogLog) • Leverage HBase Coprocessor for query latency • Job Management and Monitoring • Easy Web interface to manage, build, monitor and query cubes • Security capability to set ACL at Cube/Project Level • Support LDAP Integration
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Technologies 22 Cube Designer
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Technologies 23 Job Management
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Technologies 24 Query and Visualization
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Technologies 25 Tableau Integration
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Technologies 26 Data Modeling Points of View Cube: … Fact Table: … Dimensions: … Measures: … Storage(HBase): … Fact Dim Dim Dim Source Star Schema row A row B row C Column Family Val 1 Val 2 Val 3 Row Key Column Target HBase Storage Mapping Cube Metadata End User Cube Modeler Admin
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Technologies 27 Process Flow Source Joined tables Build dict Dimension dictionaries Hive
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Technologies 28 Process Flow Joined n cuboid n-1 cuboids Apex cuboid MR MR Dimension dictionaries MR
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Technologies 29 Process flow n cuboid n-1 cuboids Apex cuboid MR H-files HBase
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Technologies 30 How To Store Cube? – HBase Schema
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Technologies 31 SELECT test_cal_dt.week_beg_dt, test_category.category_name, test_category.lvl2_name, test_category.lvl3_name, test_kylin_fact.lstg_format_name, test_sites.site_name, SUM(test_kylin_fact.price) AS GMV, COUNT(*) AS TRANS_CNT FROM test_kylin_fact LEFT JOIN test_cal_dt ON test_kylin_fact.cal_dt = test_cal_dt.cal_dt LEFT JOIN test_category ON test_kylin_fact.leaf_categ_id = test_category.leaf_categ_id AND test_kylin_fact.lstg_site_id = test_category.site_id LEFT JOIN test_sites ON test_kylin_fact.lstg_site_id = test_sites.site_id WHERE test_kylin_fact.seller_id = 123456OR test_kylin_fact.lstg_format_name = ’New' GROUP BY test_cal_dt.week_beg_dt, test_category.category_name, test_category.lvl2_name, test_category.lvl3_name, test_kylin_fact.lstg_format_name,test_sites.site_name OLAPToEnumerableConverter OLAPProjectRel(WEEK_BEG_DT=[$0], category_name=[$1], CATEG_LVL2_NAME=[$2], CATEG_LVL3_NAME=[$3], LSTG_FORMAT_NAME=[$4], SITE_NAME=[$5], GMV=[CASE(=($7, 0), null, $6)], TRANS_CNT=[$8]) OLAPAggregateRel(group=[{0, 1, 2, 3, 4, 5}], agg#0=[$SUM0($6)], agg#1=[COUNT($6)], TRANS_CNT=[COUNT()]) OLAPProjectRel(WEEK_BEG_DT=[$13], category_name=[$21], CATEG_LVL2_NAME=[$15], CATEG_LVL3_NAME=[$14], LSTG_FORMAT_NAME=[$5], SITE_NAME=[$23], PRICE=[$0]) OLAPFilterRel(condition=[OR(=($3, 123456), =($5, ’New'))]) OLAPJoinRel(condition=[=($2, $25)], joinType=[left]) OLAPJoinRel(condition=[AND(=($6, $22), =($2, $17))], joinType=[left]) OLAPJoinRel(condition=[=($4, $12)], joinType=[left]) OLAPTableScan(table=[[DEFAULT, TEST_KYLIN_FACT]], fields=[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]]) OLAPTableScan(table=[[DEFAULT, TEST_CAL_DT]], fields=[[0, 1]]) OLAPTableScan(table=[[DEFAULT, test_category]], fields=[[0, 1, 2, 3, 4, 5, 6, 7, 8]]) OLAPTableScan(table=[[DEFAULT, TEST_SITES]], fields=[[0, 1, 2]]) Query Engine – Kylin Explain Plan
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Technologies 32 Now Let’s Make it Really Work • Full Cube – Pre-aggregate all dimension combinations – “Curse of dimensionality”: N dimension cube has 2N cuboid. • Partial Cube – To avoid dimension explosion, we divide the dimensions into different aggregation groups • 2N+M+L 2N + 2M + 2L – For cube with 30 dimensions, if we divide these dimensions into 3 group, the cuboid count is reduced from 1 Billion to 3 thousand • 230 210 + 210 + 210 – Tradeoff between online aggregation and offline pre-aggregation
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Technologies 34 Incremental Cube Building
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Technologies 36 Agenda • What is Apache Kylin? • Features & Tech Highlights • Performance • Roadmap • Q & A
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Technologies 37 # Query Type Return Dataset Query On Kylin (s) Query On Hive (s) Comments 1 High Level Aggregation 4 0.129 157.437 1,217 times 2 Analysis Query 22,669 1.615 109.206 68 times 3 Drill Down to Detail 325,029 12.058 113.123 9 times 4 Drill Down to Detail 524,780 22.42 6383.21 278 times 5 Data Dump 972,002 49.054 N/A 0 50 100 150 200 SQL #1 SQL #2 SQL #3 Hive Kylin High Level Aggregati on Analysis Query Drill Down to Detail Low Level Aggregati on Transactio n Level Based on 12+B records Kylin vs. Hive
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Technologies 38 Performance Scaleout Linear scale out with more nodes
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Technologies 39 Performance - Query Latency 99 %-ile 95 %-ile
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Technologies 40 Agenda • What is Apache Kylin? • Features & Tech Highlights • Performance • Roadmap • Q & A
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Technologies 41 201520142013 Initial Prototype for MOLAP • Basic end to end POC MOLAP • Incremental Refresh • ANSI SQL • ODBC Driver • Web GUI • ACL • Open Source HOLAP • Streaming OLAP • JDBC Driver • New UI • Excel Support • … more Next Gen • Automation • Capacity Management • In-Memory Analysis (TBD) • Spark (TBD) • … more TBD Future… Sep, 2013 Jan, 2014 Sep, 2014 Q1, 2015 Kylin History and Roadmap
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Technologies 42 Kylin Ecosystem • Kylin Core – Fundamental framework of Kylin OLAP Engine • Extension – Plugins to support for additional functions and features • Integration – Lifecycle Management Support to integrate with other applications • Interface – Allows for third party users to build more features via user-interface atop Kylin core • Driver – ODBC and JDBC Drivers Kylin OLAP Core Extension Security Redis Storage Spark Engine Docker Interface Web Console Customized BI Ambari/Hue Plugin Integration ODBC Driver ETL Drill SparkSQL
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Technologies 44 If you want to go fast, go alone. If you want to go far, go together. --African Proverb
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Technologies 45 Agenda • What is Apache Kylin? • Features & Tech Highlights • Performance • Roadmap • Q & A
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Technologies 46 Q&A @mapr maprtech tdunning@mapr.com Engage with us! MapR maprtech mapr-technologies