Advanced Design Patterns for Amazon DynamoDB - DAT403 - re:Invent 2017

1. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved.© 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. AWS re:INVENT Advanced Design Patterns for Amazon DynamoDB R i c k H o u l i h a n – S e n i o r P r a c t i c e M a n a g e r , N o S Q L A W S P r o f e s s i o n a l S e r v i c e s D A T 4 0 3 N o v e m b e r 2 9 , 2 0 1 7

2. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. What to Expect from the Session • When to use NoSQL and why • Brief overview of Amazon DynamoDB • Hot keys, design considerations • NoSQL data modeling • Normalized versus unstructured schema • Common NoSQL design patterns • Time series, write-sharding, MVCC, etc. • Amazon DynamoDB in the serverless ecosystem

5. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Why NoSQL? Optimized for storage Optimized for compute Normalized/relational Denormalized/hierarchical Ad hoc queries Instantiated views Scale vertically Scale horizontally Good for OLAP Built for OLTP at scale SQL NoSQL

6. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon DynamoDB Document or key-value Scales to any workloadFully managed NoSQL Access control Event-driven programmingFast and consistent

7. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Table Table Items Attributes Partition key Sort key Mandatory Key-value access pattern Determines data distribution Optional Model 1:N relationships Enables rich query capabilities All items for key ==, <, >, >=, <= “begins with” “between” “contains” “in” sorted results counts top/bottom N values

15. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Partition 1 1000 WCUs Partition K 1000 WCUs Partition M 1000 WCUs Partition N 1000 WCUs Votes Table Candidate A Candidate B Scaling bottlenecks Voters Provision 200,000 WCUs

16. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Queue-based load leveling Workers Dashboard SQS • Write incoming votes to SQS • Scale workers as needed to process queue • Avoid key pressure

17. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Write sharding Candidate A_2 Candidate B_1 Candidate B_2 Candidate B_3 Candidate B_5 Candidate B_4 Candidate B_7 Candidate B_6 Candidate A_1 Candidate A_3 Candidate A_4 Candidate A_7 Candidate B_8 Candidate A_6 Candidate A_8 Candidate A_5 Voter Votes Table

18. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Write sharding Candidate A_2 Candidate B_1 Candidate B_2 Candidate B_3 Candidate B_5 Candidate B_4 Candidate B_7 Candidate B_6 Candidate A_1 Candidate A_3 Candidate A_4 Candidate A_7 Candidate B_8 Insert: “CandidateA_” + rand(0, 10) Candidate A_6 Candidate A_8 Candidate A_5 Voter Votes Table

19. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Votes Table Shard aggregation Candidate A_2 Candidate B_1 Candidate B_2 Candidate B_3 Candidate B_5 Candidate B_4 Candidate B_7 Candidate B_6 Candidate A_1 Candidate A_3 Candidate A_4 Candidate A_5 Candidate A_6 Candidate A_8 Candidate A_7 Candidate B_8 Periodic process Candidate A Total: 2.5M 1. Sum 2. Store Voter

20. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Query a single sharded item efficiently Candidate A_2 Candidate B_1 Candidate B_2 Candidate B_3 Candidate B_5 Candidate B_4 Candidate B_7 Candidate B_6 Candidate A_1 Candidate A_3 Candidate A_4 Candidate A_7 Candidate B_8 Insert: “CandidateA_” + hash(SSN) Candidate A_6 Candidate A_8 Candidate A_5 Voter Votes Table

21. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Calculating partition counts (reads) Items per partition Average item size RCU Size Requests per second 100 K * 0.2 KB / 4 KB * 10 / 3000 = Partition max RCU ~ 17

22. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Calculating partition counts (writes) Items per second Average item size 100 K * (itemSize < 1KB ? 1KB : itemSize) / 1000 = Partition max WCU 100

23. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Increase throughput with concurrency Consider RCU/WCU per key, item size and request rate Shard write-heavy partition keys your write workload is not horizontally scalable

25. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Finding expired items Active Tickets_Table Event_id (Partition) Timestamp GSIKey Rand(0-N) … Attribute N Expired Tickets GSI GSIKey (Partition) Timestamp (Sort) Archive Table Event_id (Partition) Timestamp (Sort) Attribute1 …. Attribute N RCUs = 10000 WCUs = 10000 RCUs = 100 WCUs = 1 Current table HotdataColddata Scatter query GSI for expired tickets and use TTL to archive

26. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Find items efficiently with AWS Lambda Use a write-sharded GSI to selectively query the entire table Create a Lambda “stored procedure” to process items Migrate data between tables with TTL/Streams/Lambda there is a need to query all items on the table selectively

28. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Partition 1 2000 RCUs Partition K 2000 RCUs Partition M 2000 RCUs Partition 50 2000 RCU Scaling bottlenecks Product A Product B Shoppers Product Catalog Table SELECT Id, Description, ... FROM ProductCatalog WHERE Id="POPULAR_PRODUCT"

30. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. • Fully managed, highly available: handles all software management, fault tolerant, replication across multi-AZs within a region • DynamoDB API compatible: seamlessly caches DynamoDB API calls, no application re-writes required • Write-through: DAX handles caching for writes • Flexible: configure DAX for one table or many • Scalable: scales-out to any workload with up to 10 read replicas • Manageability: fully integrated AWS service: Amazon CloudWatch, tagging for DynamoDB, AWS Console • Security: Amazon VPC, AWS IAM, AWS CloudTrail, AWS Organizations Features DynamoDB Accelerator (DAX) DynamoDB Your Applications DynamoDB Accelerator

33. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Secondary index Opponent Date GameId Status Host Alice 2014-10-02 d9bl3 DONE David Carol 2014-10-08 o2pnb IN_PROGRESS Bob Bob 2014-09-30 72f49 PENDING Alice Bob 2014-10-03 b932s PENDING Carol Bob 2014-10-03 ef9ca IN_PROGRESS David BobPartition key Sort key Multi-value sorts and filters

34. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Secondary Index Approach 1: Query filter Bob Opponent Date GameId Status Host Alice 2014-10-02 d9bl3 DONE David Carol 2014-10-08 o2pnb IN_PROGRESS Bob Bob 2014-09-30 72f49 PENDING Alice Bob 2014-10-03 b932s PENDING Carol Bob 2014-10-03 ef9ca IN_PROGRESS David SELECT * FROM Game WHERE Opponent='Bob' ORDER BY Date DESC FILTER ON Status='PENDING' (filtered out)

35. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Approach 2: Composite key StatusDate DONE_2014-10-02 IN_PROGRESS_2014-10-08 IN_PROGRESS_2014-10-03 PENDING_2014-09-30 PENDING_2014-10-03 Status DONE IN_PROGRESS IN_PROGRESS PENDING PENDING Date 2014-10-02 2014-10-08 2014-10-03 2014-10-03 2014-09-30 + =

36. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Secondary Index Approach 2: Composite key Opponent StatusDate GameId Host Alice DONE_2014-10-02 d9bl3 David Carol IN_PROGRESS_2014-10-08 o2pnb Bob Bob IN_PROGRESS_2014-10-03 ef9ca David Bob PENDING_2014-09-30 72f49 Alice Bob PENDING_2014-10-03 b932s Carol Partition key Sort key

37. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Opponent StatusDate GameId Host Alice DONE_2014-10-02 d9bl3 David Carol IN_PROGRESS_2014-10-08 o2pnb Bob Bob IN_PROGRESS_2014-10-03 ef9ca David Bob PENDING_2014-09-30 72f49 Alice Bob PENDING_2014-10-03 b932s Carol Secondary index Approach 2: Composite key Bob SELECT * FROM Game WHERE Opponent='Bob' AND StatusDate BEGINS_WITH 'PENDING'

38. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Sparse indexes Id (Partition) User Game Score Date Award 1 Bob G1 1300 2012-12-23 2 Bob G1 1450 2012-12-23 3 Jay G1 1600 2012-12-24 4 Mary G1 2000 2012-10-24 Champ 5 Ryan G2 123 2012-03-10 6 Jones G2 345 2012-03-20 Game-scores-table Award (Partition) Id User Score Champ 4 Mary 2000 Award-GSI Scan sparse GSIs

39. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Concatenate attributes to form useful secondary index keys Take advantage of sparse indexes Replace filter with indexes you want to optimize a query as much as possible Status + Date

41. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved.© 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Reports Table Workflow Management App David SELECT * FROM Reports WHERE Owner = ‘David’ AND State = ‘Pending’ LIMIT 50 ORDER BY Date DESC Pending SELECT * FROM Reports WHERE Owner = ‘David’ AND State = ‘Processed’ LIMIT 50 ORDER BY Date DESC Processed

42. Owner StateDate Document David Pending#2014-10-02 … … many more Reports for David … David Processed#2014-10-03 … Alice Pending#2014-09-28 … Alice Pending#2014-10-01 … Large and small attributes mixed (Many more report items) David Reports table 50 items × 256 KB each Partition key Sort key Large attachments SELECT * FROM Reports WHERE Recipient=‘David’ AND Status=‘Pending’ LIMIT 50 ORDER BY Date DESC Inbox © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved.

43. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Computing read query cost Items evaluated by query Average item size Conversion ratio Eventually consistent reads 50 * 256KB * (1 RCU / 4 KB) * (1 / 2) = 1600 RCU

44. Owner StateDate Summary ReportID David Pending#2014-10-02 … afed David Processed#2014-10-03 … 3kf8 Alice Processed#2014-09-28 … 9d2b Alice Processed#2014-10-01 … ct7r Separate the bulk data Pending-GSI Reports table ReportID Body 9d2b … 3kf8 … ct7r … afed … David 1. Query Pending-GSI: 1 RCU 2. BatchGetItem messages: 1600 RCU (50 separate items at 256 KB) (50 sequential items at 128 bytes) Uniformly distributes large item reads © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved.

46. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Reduce one-to-many item sizes Configure secondary index projections Use GSIs to model M:N relationship Distribute large items querying many large items at once ProcessedReportsPending

49. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. How OLTP apps use data  Mostly hierarchical structures  Entity driven workflows  Data spread across tables  Requires complex queries  Primary driver for ACID

50. ItemID (PK) Version (SK) CurVer Attrs 1 v0 2 … v1 … v2 … v3 … Emulating ACID transactions (Many more item partitions) Item versions Overwrite v0 Item to Commit changes COPY Item.v0 -> Item1.v3 IF Item.v3 == NULL UPDATE Item1.v3 SET Attr1 += 1 UPDATE Item1.v3 SET Attr2 = … UPDATE Item1.v3 SET Attr3 = … COPY Item1.v3 -> Item1.v0 SET CurVer = 3 Transaction © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved.

51. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Versioning item sets Get all items for a product assembly SELECT * FROM Assemblies WHERE ID=1 Order Item Picker ID PartID Vendor Bin 1 1 ACME 27Z19 2 ACME 39M97 3 ACME 75B25 (Many more assemblies) Assemblies table Partition key Sort key

52. ID PartID Vendor Bin 1 1 ACME 27Z19 2 ACME 39M97 3 ACME 75B25 4 UAC 53G56 5 UAC 64B17 6 UAC 48J19 Updates are problematic (Many more assemblies) Assemblies table Old items SELECT * FROM Assemblies WHERE ID=1 Order Item Picker New items © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved.

53. ID PartID Vendor Bin 1 1 ACME 27Z19 2 ACME 39M97 3 ACME 75B25 4 UAC 53G56 5 UAC 64B17 6 UAC 48J19 Creating partition “locks” (Many more assemblies) Assemblies table • Use metadata item for versioning SET #ItemList.i = list append(:newList, #ItemList.i ), #Lock = 1 • Obtain locks with conditional writes --condition-expression “Lock = 0” • Remove old items or add version info to Sort Key Query composite keys for specific versions • Readers can determine how to handle “fat” reads • Add additional metadata to manage transactional workflow as needed Current state, breadcrumbs, timeout, etc. ID PartID ItemList Lock 1 0 {i:[[1,2,3],[4,5,6]]} 0 © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved.

54. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Use item partitions to manage transactional workflows Manage versioning across items with metadata Tag attributes to maintain multiple versions Code your app to recognize when updates are in progress Implement app layer error handling and recovery logic transactional writes across items is required

55. Geo-hashing FleetID (PK) Location (SK) GSIKey Rand(0-N) GUID 0201200 … 0213211 … 0233321 … 0320011 … • Break down map area into a grid • Continue to subdivide grid sections to narrow down search areas • Use range queries to find nearby items • Configure write-sharded GSI to query across partitions GSIKey (PK) Location (SK) FleetID 0-N … GUID … GUID … GUID … GUID

57. Hierarchical data structures as items • Use composite sort key to define a hierarchy • Highly selective queries with sort conditions • Reduce query complexity © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved.

58. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. … or as documents (JSON) JSON data types (M, L, BOOL, NULL) Document SDKs available Indexing only by using DynamoDB Streams or AWS Lambda 400 KB maximum item size (limits hierarchical data structure) Primary Key Attributes PK Items BookID type title author genre publisher datePublished ISBN Book Ringworld Larry Niven Science Fiction Ballantine Oct-70 0-345-02046-4 AlbumID type title artist genre Attributes Album Dark Side of the Moon Pink Floyd Progressive Rock { label:"Harvest", studio: "Abbey Road", published: "3/1/73", producer: "Pink Floyd", tracks: [{title: "Speak to Me", length: "1:30", music: "Mason", vocals: "Instrumental"},{title: ”Breathe", length: ”2:43", music: ”Waters, Gilmour, Wright", vocals: ”Gilmour"},{title: ”On the Run", length: “3:30", music: ”Gilmour, Waters", vocals: "Instrumental"}]} MovieID type title genre writer Attributes Movie Idiocracy Scifi Comedy Mike Judge { producer: "20th Century Fox", actors: [{ name: "Luke Wilson", dob: "9/21/71", character: "Joe Bowers", image: "img2.jpg"},{ name: "Maya Rudolph", dob: "7/27/72", character: "Rita", image: "img1.jpg"},{ name: "Dax Shepard", dob: "1/2/75", character: "Frito Pendejo", image: "img3.jpg"}]

59. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. … or as nested sets • Store data trees on a table as array of leaf items • Non-leaf items define start/end index values • Query for leaf items by category using index ranges

60. • Partition table on node ID, add edges to define adjacency list • Define a default edge for every node type to describe the node itself • Use partitioned GSIs to query large nodes (dates, places, etc.) • Use Dynamo DB Streams/Lambda/EMR for graph query projections • Neighbor entity state • Subtree aggregations • Breadth first search • Node ranking Adjacency lists and materialized graphs GSI Primary Key Attributes GSIkey Data Target Type Node Projection 0-N Jason Bourne 1 Person 1 … James John Doe 4 4 … 20170418 2 Birthdate 1 … 4 … Date 2 … Finland 3 Birthplace 1 … 4 … Place 3 … GSI Primary Key Attributes GSIkey Type Target Data Node Projection 0-N Person 1 Jason Bourne 1 … 4 John Doe 4 … Birthdate 2 20170418 1 … 4 … Birthplace 3 Finland 1 … 4 … Date 2 20170418 2 … Place 3 Finland 3 … Table Primary Key Attributes Node Type Target Data GSIkey Projection 1 Person 1 Jason Bourne HASH(Person.Data) Edge/spanning tree rollups Birthdate 2 20170418 Birthplace 3 Finland 2 Date 2 20170418 HASH(Data) (Summary Stats) 3 Place 3 Finland 4 Person 4 John Doe HASH(Person.Data Edge/spanning tree rollups Birthdate 2 20170418 Birthplace 3 Finland

61. Audible eBook sync service • Allows users to save session state for Audible eBooks • Maintains mappings per user for eBooks and audio products • Spikey load patterns require significant overprovisioning • Large number of access patterns © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved.

62. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Access patterns # ACCESS PATTERNS: https://w.amazon.com/index.php/WfV/Services/DBMigration USE CASE 1 CompanionMapping getCompanionMappingsByAsin 2 CompanionMapping getCompanionMappingsByEbookAndAudiobookContentId 3 CompanionMapping getCompanionMappingsFromCache 4 CompanionMapping getCompanionMappings 5 CompanionMapping getCompanionMappingsAvailable 6 AcrInfo getACRInfo 7 AcrInfo getACRs 8 AcrInfo getACRInfos 9 AcrInfo getACRInfosbySKU 10 AudioProduct getAudioProductsForACRs 11 AudioProduct getAudioProducts 12 AudioProduct deleteAudioProductsMatchingSkuVersions 13 AudioProduct getChildAudioProductsForSKU 14 Product getProductInfoByAsins 15 Product getParentChildDataByParentAsins 16 AudioFile getAudioFilesForACR 17 AudioFile getAudioFilesForChildACR 18 AudioFile getAudioFilesByParentAsinVersionFormat 19 AudioFile getAudioFiles 20 AudioFile getAudioFilesForChildAsin

63. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Primary table T A B L E Primary Key Attributes PK SK (GSI 3) ABOOKACR1 v0#ABOOKACR1 GSI-1 GSI-2 ABOOK-ASIN1 ABOOK-SKU1 EBOOKACR1 GSI-1 GSI-2 SyncFileAcr ABOOK-ASIN1 ABOOKACR1#TRACK#1 GSI-1 GSI-2 ABOOK-ASIN1 ABOOK-SKU1 ABOOKACR1#TRACK#2 GSI-1 GSI-2 ABOOK-ASIN1 ABOOK-SKU1 EBOOKACR1 EBOOKACR1 GSI-1 EBookAsin EBOOK-SKU1 ASIN

64. © 2017, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Indexes G S I 1 Partition Key Projected Attributes ABOOK-ASIN1 ABOOKACR1 ABOOKACR1-v1 ABOOKACR1#TRACK#1 ABOOKACR1#TRACK#2 SyncFileAcr ABOOKACR1 MAP-EBOOKACR1 EBOOK-SKU1 ABOOKACR1 EBOOKACR1 G S I 2 Partition Key Projected Attributes ABOOK-ASIN1 ABOOKACR1 MAP-EBOOKACR1 ABOOK-SKU1 ABOOKACR1 ABOOKACR1-v1 ABOOKACR1#TRACK#1 ABOOKACR1#TRACK#2 G S I 3 GSI Partition Key Projected Attributes V0#ABOOKACR1 ABOOKACR1 ABOOKACR1-v1 EBOOKACR1 ABOOKACR1 MAP-EBOOKACR1 ABOOKACR1#TRACK#1 ABOOKACR1 ABOOKACR1#TRACK#1 ABOOKACR1#TRACK#2 ABOOKACR1 ABOOKACR1#TRACK#2 EBOOKACR1 ABOOKACR1 EBOOKACR1

65. Query conditions # ACCESS PATTERNS: https://w.amazon.com/index.php/WfV/Services/DBMigration USE CASE Lookup parameters INDEX Key Conditions Filter Conditions 1 CompanionMapping getCompanionMappingsByAsin audiobookAsin/ebookSku GSI2 GSI-2=ABOOK-ASIN1 None 2 CompanionMapping getCompanionMappingsByEbookAndAudi obookContentId ebookAcr/sku,version,format or audiobookAcr/asin,version,format GSI-3 on TargetACR attribute OR PrimaryKey on Table GSI-3=MAP-EBOOKACR1 version=v and format=f 3 CompanionMapping getCompanionMappingsFromCache ebookAcr/sku,version,format or audiobookAcr/asin,version,format GSI-3 on TargetACR attribute OR PrimaryKey on Table GSI-3=MAP-EBOOKACR1 version=v and format=f 4 CompanionMapping getCompanionMappings syncfileAcr, ebookAcr?, audiobookAcr? GSI1 GSI-1=SyncFileAcr None 5 CompanionMapping getCompanionMappingsAvailable ebookAcr, audiobookAcr Primary Key on Table Acr=ABOOKACR1 and TargetACR beginswith "MAP-" 6 AcrInfo getACRInfo acr Primary Key on Table Acr=ABOOKACR1 and TargetACR beginswith "ABOOKACR1-v" 7 AcrInfo getACRs acr / asin,version,format Primary Key on Table Acr=ABOOKACR1 version=v and format=f 8 AcrInfo getACRInfos acr Primary Key on table Acr=ABOOKACR1 and TargetACR beginswith "ABOOKACR1" 9 AcrInfo getACRInfosbySKU sku GSI2 GSI-2=ABOOK-SKU1 10 AudioProduct getAudioProductsForACRs acr Primary Key on table Acr=ABOOKACR1 and TargetACR beginswith "ABOOKACR1" 11 AudioProduct getAudioProducts sku, version, format GSI2 GSI-2=ABOOK-SKU1 version=v and format=f 12 AudioProduct deleteAudioProductsMatchingSkuVersions sku, version GSI2 GSI-2=ABOOK-SKU1 version=v 13 AudioProduct getChildAudioProductsForSKU sku GSI2 GSI-2=ABOOK-SKU1 14 Product getProductInfoByAsins asin GSI1 GSI-1=ABOOK-ASIN1 15 Product getParentChildDataByParentAsins asin GSI1 GSI-1=ABOOK-ASIN1 16 AudioFile getAudioFilesForACR acr Primary Key on table Acr=ABOOKACR1 and TargetACR beginswith "ABOOKACR1#" 17 AudioFile getAudioFilesForChildACR acr, parent_asin Primary Key on table Acr=ABOOKACR1 version=v and format=f 18 AudioFile getAudioFilesByParentAsinVersionFormat parent_asin, version, format GSI1 GSI-1=ABOOK-ASIN1 version=v and format=f 19 AudioFile getAudioFiles sku, version, format GSI2 GSI-2=ABOOK-SKU1 version=v and format=f 20 AudioFile getAudioFilesForChildAsin asin, parent_asin, version, format GSI1 GSI-1=ABOOK-ASIN1 version=v and format=f

Advanced Design Patterns for Amazon DynamoDB - DAT403 - re:Invent 2017

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