Hyrise - a Main Memory Hybrid Storage Engine
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1 Hyrise - a Main Memory Hybrid Storage Engine Philippe Cudré-Mauroux exascale Infolab U. of Fribourg - Switzerland & MIT joint work w/ Martin Grund, Jens Krueger, Hasso Plattner, Alexander Zeier (HPI) and Sam Madden (MIT) October 6, 2010 SAP Labs Palo alto
2 Outline Motivation (OLTP VS OLAP) Hyrise Architecture Hybrid Layouts Query Execution Cost Model Physical Layouters Optimal Layouter Scalable Layouter Performance Current & Future Work
3 Motivation: the DBMS Divide OLTP Data entry Mix of reads and writes to few rows at a time Index structures (B+ Trees) Transaction Processing System VS OLAP Aggregates Bulk updates (ETL) Large sequential scans spanning few columns but many rows Warehousing Rise of columnstores OLTP HYRISE OLAP
4 Problems w/ current divide Increasing needs for real-time analytics and hybrid workloads e.g., ATP (Available To Promise) applications involve both OLTP queries and OLAP aggregates fundamental bottleneck implied by implicit separation Duplication of data management systems is cumbersome and costly for SMEs... and even for large companies
5 Hyrise Hyrise: a Main memory Simplicity Efficiency Future of DBMS market for enterprise data Hybrid storage engine Partitions tables into vertical partitions of varying widths depending on how columns accessed (e.g., transactionally or analytically) OLTP HYRISE OLAP
6 Hyrise Architecture Query Processor R R Layout Manager Layouter R Workload Data In-Memory Storage Manager Attribute Groups Attribute Groups Data Container
7 Hybrid Layouts A2 A4 A5 A6 A7 A1 A3 A8 A9 OLTP -style hybrid chunks OLAP -style
8 Query Processing Query plans Trees of operators Standard operators Look-ups, aggregations, joins, etc. Support both early and late-materialization strategies
9 Examples of query plans Position Lookup Position AND Positions Values Positions Position Lookup 3,4 Position AND Hash Join 1,3,4,5 Positions 3,4,5 Values 1,2,3,4 Filter Filter Filter Filter Filter Dimension Tables Fact Table Join Plan non-join Plan
10 Physical Database Design (1) Obviously, performance heavily depends on the way attributes are partitioned
11 Physical Database Design (2) Optimal physical layout λopt dependent on Set of attributes and #tuples (DB) Important / frequent queries (W) Cost of various queries given a layout (Cost) Two issues Accurate cost-model Optimal and efficient layout-selection algorithm
12 Cost-Model (1) What to model? layout-dependent VS layout-independent costs Where does time go in main-memory layoutdependent operations? cache misses (L1/L2) Highly accurate model for cache misses in hybrid DBMSs
13 Cost Model Basics C.o a1 a2 a3 a4 a5 r0 r1 r2 r3!.w C.w L.w Partial projections: with and
14 Cost Model (2) Additional expressions for Arbitrary combination of partial projections Selections Joins, aggregates Container padding, cache collision, prefetching decisions etc.
15 Layout Selection We can discriminate layouts thanks to the cost-model How many layouts shall we consider for n attributes? a(n) = (2n 1)a(n 1) (n 1)(n 2)a(n 2) w/ a(0) = a(1) = 1 3,535,017,524,403 for a table of 15 attributes Efficient optimal algorithm Scalable approximate algorithm
16 Optimal Layouter Three phases Candidate Generation Primary partitions (no container overhead cost) Candidate Merging Combine candidates Discard candidates that are subsumed by a set of more efficient candidates e.g., Cost( A1, A2 ) < Cost ( A1,A2 ) Layout Generation Generate valid layouts Exponential in the worst-case Relevant for small workloads
17 Scalable Layouter (1) Divide-and-conquer approximate algorithm Graph storing affinities between primary partitions p 7 p 2 p1 p 5 p 8 p 9 p 3 p 0 p 10 p 4 p 6 min-cut graph-partitioning to generate sub-graphs containing at most K primary partitions approximate multilevel k-way partitioner p 7 p 2 p1 p 5 p 8 p 9 p 3 p 0 p 10 p 4 p 6
18 Scalable Layouter (2) Generate optimal layouts for each subset worst-case exponential in K Combine sub-layouts to generate final layout Requires layout evaluation in the worst case ( P = total # partitions from previous step) Approximate result Very tight upper-bound on penalty incurred Scales to hundred of primary partitions and thousands of queries e.g., a few minutes for 1000 queries and 500 att.
19 Hyrise Performance (1) Detailed performance evaluation on a realistic hybrid workload (Krueger 2010) Business Partner (KNA1) KUNNR Business Partner Address (ADRC) KUNNR Sales Document Header (VBAK) Material Text (MAKT) VBELN MATNR Sales Document Item (VBAP) MATNR Material (MARA) MATNR Material Hierarchy (MATH)
20 Workload (OLTP-Style)
21 Workload ( OLAP-Style )
22 Results (1) 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Q1 Q3 Q12 Hybrid Column Row Hybrid Column Row
23 Results (2) Hyrise combines the best of both-worlds (OLTP & OLAP systems) in one system Final speed-up depends on query weighting 40% to 400% speed-up compared to all-column / all-row layouts on a hybrid workload
24 Current Status Fully functional prototype Cost-model framework Automated layouter Article in PVLDB 2010 presentation at VLDB 2011 Current work on Multi-core optimizations Hybrid horizontal + vertical partitionings
25 Future Work Data replication & partial materialization Maximize utility function given a space budget Hybrid storage for new application domains multidimensional / scientific / multimedia data graph data (Linked Data?) XILAB
26 Hyrise - a Main Memory Hybrid Storage Engine Philippe Cudré-Mauroux exascale Infolab U. of Fribourg - Switzerland & MIT pcm@unifr.ch October 6, 2010 SAP Labs Palo alto
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