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Build a minial DBMS from scratch by Rust

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I am going to talk about how to build a minimal DBMS from scratch - the StellarSQL project. In this talk, the following is covered. What is a DBMS? What is the architecture of the DBMS? What is the progress in developing the project?

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Build a minial DBMS from scratch by Rust

  1. 1. Build a minimal DBMS from scratch by Rust Liu, An-Chi 2019/6/15 at HKOSCon !11
  2. 2. About Me • Liu, An-Chi 劉劉安⿑齊 • @tigercosmos • Rust Taiwan Community • “Everything in Rust” track in COSCUP
 !2
  3. 3. What is Rust? “Rust is a systems programming language that runs blazingly fast, prevents nearly all segmentation faults, and guarantees thread safety. ” !3
  4. 4. People Love Rust Stack Overflow 2019 Rust 83.5 % !4
  5. 5. What is DBMS !5 Neo4j
  6. 6. Why I do this? !6
  7. 7. The Beginning !7
  8. 8. StellarSQL !8
  9. 9. Minimal Architecture ServerClient Qeury Parser Disk File SQL Worker
  10. 10. Architecture Qeury Parser Planner Algebra Disk File Metadata RecordIndex Buffer Log ServerClient Protocol SQL Worker Recovery Concurrency
  11. 11. Architecture Qeury Parser Planner Algebra Disk File Metadata RecordIndex Buffer Log ServerClient Protocol SQL Worker Recovery Concurrency
  12. 12. ServerClient Protocol Tokio.rsTCP username||dbname||command;
 Asynchronous Multi-Thread
  13. 13. Architecture Qeury Parser Planner Algebra Disk File Metadata RecordIndex Buffer Log ServerClient Protocol SQL Worker Recovery Concurrency
  14. 14. Qeury Parser Planner AlgebraParser Lexer A Request in a Thread select t1.a1, t1.b1, t2.c1 from t1 join t2 on t1.a1 = t2.a1 where t1.a1 > 5 and t1.a2 < 10 ; Tokens Parser AST Parser
  15. 15. !15 Lexer Tokens Parser AST Parser struct Symbol { name: String, len: usize, token: Token, group: Group, } enum Token { Add, AddConstraint, AlterColumn, AlterTable, All, ... ... } enum Group { DataType, Function, Keyword, Operator, Identifier, Delimiter, }
  16. 16. !16 select a1 from t1 where a1 > 5 name: “select” 
 Token::Select
 Group::KeyWord name: “>” 
 Token::GT
 Group::Operator name: “t1” 
 Token::Identifier
 Group::Identifier Lexer Tokens Parser AST Parser
  17. 17. !17 Lexer Tokens Parser AST !17 ● SQL is from left to right, fit LL parser ● Easy to write by hand ● Syntax check and Semantic check predictive recursive descent parser Parser
  18. 18. !18 Lexer Tokens Parser !18 Parser !18 impl Parser { pub fn parse(&self, sql: &mut SQL) -> Result<(), ParserError> { let mut iter = self.tokens.iter().peekable(); match iter.peek() { Some(symbol) => match symbol.token { ... } None => {}
 } } } AST
  19. 19. !19 Lexer Tokens Parser AST !19 Parser !19 not a1 > 5 and a2 < 10 a1 5 > not a2 10 < and
  20. 20. Architecture Qeury Parser Planner Algebra Disk File Metadata RecordIndex Buffer Log ServerClient Protocol SQL Worker Recovery Concurrency !20
  21. 21. Disk File Metadata RecordIndex ‣ DB_1 ‣ Table_1 ‣ Page_1 ‣ Page_2 ‣ … ‣ Table_2 ‣ … ‣ DB_2 ‣ … Header Row Row Row Row Row !21
  22. 22. !22 Disk File Metadata RecordIndex B+ Tree Double Linked List
  23. 23. Double Linked List !23 struct Node { int data; struct Node *prev; struct Node *next; }; C++ implementation
  24. 24. !24 Rust implementation type NodeT<T> = Option<Arc<RefCell<T>>>; struct Node<T> { data: T, prev: NodeT<T>, next: NodeT<T> };
  25. 25. Architecture Qeury Parser Planner Algebra Disk File Metadata RecordIndex Buffer Log ServerClient Protocol SQL Worker Recovery Concurrency !25
  26. 26. !26 Page 1 Buffer Manager !26 Page 2 Page 4 Page 1 Page 2 Frame 3 Page Table Buffer Pool Page 1 Page 2 Page 3 Page 4 On-Disk File Page 4
  27. 27. Architecture Qeury Parser Planner Algebra Disk File Metadata RecordIndex Buffer Log ServerClient Protocol SQL Worker Recovery Concurrency !27
  28. 28. !28 Query 1 Log Manager Server Query Input Return OK to Client Buffer Mgr
 Update Recover On-Disk Log Query 2 Query 3 Log Table Query 1 Query 2 Query 3
  29. 29. Architecture Qeury Parser Planner Algebra Disk File Metadata RecordIndex Buffer Log ServerClient Protocol SQL Worker Recovery Concurrency !29
  30. 30. !30 Index Concurrency Control Transaction Concurrency Control Concurrency
  31. 31. !31 20 10 35 6 12 3 4 6 9 10 11 12 13 20 22 23 31 35 36 38 41 23 38 44 Index Concurrency Control Example - Insert 14 - Search 22
  32. 32. !32 20 10 35 6 12 4 6 9 10 11 12 13 20 22 23 31 35 36 23 38 Insert 14 3 Index Concurrency Control
  33. 33. !33 20 10 35 6 12 4 6 9 10 11 12 13 20 22 23 31 35 36 23 38 Insert 14 3 W Index Concurrency Control
  34. 34. !34 20 10 35 6 12 4 6 9 10 11 12 13 20 22 23 31 35 36 23 38 Insert 14 3 W Index Concurrency Control
  35. 35. !35 20 10 35 6 12 4 6 9 10 11 12 13 20 22 23 31 35 36 23 38 Insert 14 3 14 14 W WW W Index Concurrency Control
  36. 36. !36 20 10 35 6 12 3 4 6 9 10 11 12 13 20 22 23 31 35 36 38 41 23 38 Search 22 Index Concurrency Control
  37. 37. !37 20 10 35 6 12 4 6 9 10 11 12 13 20 22 23 31 35 36 23 38 44 Search 22 R 3 38 41 Index Concurrency Control
  38. 38. !38 20 10 35 6 12 4 6 9 10 11 12 13 20 22 23 31 35 36 23 38 44 Search 22 R 3 38 41 Index Concurrency Control
  39. 39. !39 20 10 35 6 12 4 6 9 10 11 12 13 20 22 23 31 35 36 23 38 Search 22 R 3 38 41 Index Concurrency Control
  40. 40. !40 20 10 35 6 12 4 6 9 10 11 12 13 20 22 23 31 35 36 23 38 Search 22 R 3 38 41 Index Concurrency Control WInsertion 14
  41. 41. !41 20 10 35 6 12 4 6 9 10 11 12 13 20 22 23 31 35 36 23 38 Search 22 R 3 38 41 Index Concurrency Control
  42. 42. !42 20 10 35 6 12 4 6 9 10 11 12 13 20 22 23 31 35 36 23 38 Search 22 3 38 41 R Index Concurrency Control
  43. 43. !43 Tasks Tx Tx Tx Tx Tx Time Start Transaction Write Read Read Commit Write
  44. 44. !44 Transaction Concurrency Control Tasks R1(A) W1(A) Tx1 R2(A) W2(A) Tx2
  45. 45. !45 W(A) T1 R(A) Time Schedule T2 Transaction Concurrency Control Start W(A) Start Commit Commit R(A)
  46. 46. Architecture Qeury Parser Planner Algebra Disk File Metadata RecordIndex Buffer Log ServerClient Protocol SQL Worker Recovery Concurrency !46
  47. 47. !47 https://github.com/stellarsql/StellarSQL
  48. 48. DEMO !48
  49. 49. Another Great Course !49
  50. 50. Thank You !50

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