Building a CQL driver
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The document discusses building a CQL driver for Cassandra. It shows the CQL protocol headers and outlines the steps to open a socket connection, handle options, authenticate with credentials, and issue and receive results for CQL queries.
![OPTIONS
{“CQL_VERSION”: [“3.0.0”, ...]}
STARTUP
READY
#CASSANDRAEU
@ICONARA](https://image.slidesharecdn.com/buildingacqldriver-131017101315-phpapp02/85/Building-a-CQL-driver-29-320.jpg)
![Map: a [short] n indicating the size of the map,
followed by n entries. Each entry is composed
of two [short bytes] representing the key and
the value of the entry map.
#CASSANDRAEU
@ICONARA](https://image.slidesharecdn.com/buildingacqldriver-131017101315-phpapp02/85/Building-a-CQL-driver-59-320.jpg)
Building a CQL driver
- 1. Building a CQL driver Theo Hultberg | Chief Architect, Burt #CASSANDRAEU CASSANDRASUMMITEU
- 2. Theo Hultberg Chief Architect at #CASSANDRAEU @ICONARA
- 4. I LIKE RUBY AND I LIKE CASSANDRA #CASSANDRAEU @ICONARA
- 7. 01 00 56 05 00 01 45 33 #CASSANDRAEU 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 @ICONARA
- 8. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 9. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 10. 0000 0001 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 1000 0001 #CASSANDRAEU @ICONARA
- 11. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 12. 02 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 82 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 13. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 14. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 15. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 16. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 17. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 18. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 19. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 20. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 21. 01 00 2a 01 00 00 00 16 00 01 00 0b C Q L _ V E R S I O N 00 05 33 2e 30 2e 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 22. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 23. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 24. 01 00 2a 01 00 00 00 16 00 01 00 0b 43 51 4c 5f 56 45 52 53 49 4f 4e 00 05 3 . 0 . 0 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 25. 01 00 56 05 00 01 45 33 2a 00 52 2e 01 0b 53 30 00 43 49 2e 00 00 16 51 4c 5f 4f 4e 00 30 81 00 2a 02 00 00 00 00 #CASSANDRAEU @ICONARA
- 32. 01 00 00 07 00 00 00 19 00 00 00 13 53 45 4c 45 43 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 73 00 04 81 00 00 6d 61 04 74 1e 75 6e c4 00 00 05 65 73 70 65 ee 65 65 7e 00 00 75 00 73 68 72 d0 00 74 15 #CASSANDRAEU 08 03 73 0d 77 69 2e 93 00 00 44 00 00 65 00 6f 6c 6e cb 00 00 35 00 0a 72 05 72 00 65 22 0d 00 32 00 6d 73 65 64 00 74 bb 73 20 73 bf 79 00 6d 00 00 00 8f 75 32 00 6b 09 61 03 0d 00 5a 65 7b 00 65 75 69 00 70 00 cd 40 6f 00 79 73 6c 00 68 20 c3 69 07 02 73 65 00 00 69 5e 00 6e 43 00 70 72 0d 02 6c b6 00 74 58 00 61 5f 00 00 40 3b 00 65 11 00 63 6e 08 00 69 bb 03 72 23 01 65 61 70 00 6e e0 73 2e 9b @ICONARA
- 33. 01 00 00 07 00 00 00 19 00 00 00 13 53 45 4c 45 43 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 73 00 04 81 00 00 6d 61 04 74 1e 75 6e c4 00 00 05 65 73 70 65 ee 65 65 7e 00 00 75 00 73 68 72 d0 00 74 15 #CASSANDRAEU 08 03 73 0d 77 69 2e 93 00 00 44 00 00 65 00 6f 6c 6e cb 00 00 35 00 0a 72 05 72 00 65 22 0d 00 32 00 6d 73 65 64 00 74 bb 73 20 73 bf 79 00 6d 00 00 00 8f 75 32 00 6b 09 61 03 0d 00 5a 65 7b 00 65 75 69 00 70 00 cd 40 6f 00 79 73 6c 00 68 20 c3 69 07 02 73 65 00 00 69 5e 00 6e 43 00 70 72 0d 02 6c b6 00 74 58 00 61 5f 00 00 40 3b 00 65 11 00 63 6e 08 00 69 bb 03 72 23 01 65 61 70 00 6e e0 73 2e 9b @ICONARA
- 34. 01 00 00 07 00 00 00 19 00 00 00 13 53 45 4c 45 43 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 73 00 04 81 00 00 6d 61 04 74 1e 75 6e c4 00 00 05 65 73 70 65 ee 65 65 7e 00 00 75 00 73 68 72 d0 00 74 15 #CASSANDRAEU 08 03 73 0d 77 69 2e 93 00 00 44 00 00 65 00 6f 6c 6e cb 00 00 35 00 0a 72 05 72 00 65 22 0d 00 32 00 6d 73 65 64 00 74 bb 73 20 73 bf 79 00 6d 00 00 00 8f 75 32 00 6b 09 61 03 0d 00 5a 65 7b 00 65 75 69 00 70 00 cd 40 6f 00 79 73 6c 00 68 20 c3 69 07 02 73 65 00 00 69 5e 00 6e 43 00 70 72 0d 02 6c b6 00 74 58 00 61 5f 00 00 40 3b 00 65 11 00 63 6e 08 00 69 bb 03 72 23 01 65 61 70 00 6e e0 73 2e 9b @ICONARA
- 35. 01 00 00 07 00 00 00 19 00 00 00 13 C T * F R O M U S 04 81 00 00 6d 61 04 74 1e 75 6e c4 00 00 05 65 73 70 65 ee 65 65 7e 00 00 75 00 73 68 72 d0 00 74 15 #CASSANDRAEU 08 03 73 0d 77 69 2e 93 00 00 44 00 00 65 00 6f 6c 6e cb 00 00 35 00 0a 72 05 72 00 65 22 0d 00 32 00 6d 73 65 64 00 74 bb 73 20 73 bf 79 00 6d 00 00 00 8f 75 32 00 6b 09 61 03 0d 00 5a 65 7b 00 65 75 69 00 70 00 cd 40 6f 00 79 73 6c 00 68 20 c3 69 07 02 73 65 00 00 69 5e 00 6e 43 S E E R 00 70 72 0d 02 6c b6 00 74 58 00 61 5f 00 00 40 3b 00 65 11 L E S 00 00 63 6e 08 00 69 bb 03 72 23 01 65 61 70 00 6e e0 73 2e 9b @ICONARA
- 36. 01 00 00 07 00 00 00 19 00 00 00 13 53 45 4c 45 43 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 73 00 04 81 00 00 6d 61 04 74 1e 75 6e c4 00 00 05 65 73 70 65 ee 65 65 7e 00 00 75 00 73 68 72 d0 00 74 15 #CASSANDRAEU 08 03 73 0d 77 69 2e 93 00 00 44 00 00 65 00 6f 6c 6e cb 00 00 35 00 0a 72 05 72 00 65 22 0d 00 32 00 6d 73 65 64 00 74 bb 73 20 73 bf 79 00 6d 00 00 00 8f 75 32 00 6b 09 61 03 0d 00 5a 65 7b 00 65 75 69 00 70 00 cd 40 6f 00 79 73 6c 00 68 20 c3 69 07 02 73 65 00 00 69 5e 00 6e 43 00 70 72 0d 02 6c b6 00 74 58 00 61 5f 00 00 40 3b 00 65 11 00 63 6e 08 00 69 bb 03 72 23 01 65 61 70 00 6e e0 73 2e 9b @ICONARA
- 37. 01 00 00 07 00 00 00 19 00 00 00 13 53 45 4c 45 43 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 73 00 04 81 00 00 6d 61 04 74 1e 75 6e c4 00 00 05 65 73 70 65 ee 65 65 7e 00 00 75 00 73 68 72 d0 00 74 15 #CASSANDRAEU 08 03 73 0d 77 69 2e 93 00 00 44 00 00 65 00 6f 6c 6e cb 00 00 35 00 0a 72 05 72 00 65 22 0d 00 32 00 6d 73 65 64 00 74 bb 73 20 73 bf 79 00 6d 00 00 00 8f 75 32 00 6b 09 61 03 0d 00 5a 65 7b 00 65 75 69 00 70 00 cd 40 6f 00 79 73 6c 00 68 20 c3 69 07 02 73 65 00 00 69 5e 00 6e 43 00 70 72 0d 02 6c b6 00 74 58 00 61 5f 00 00 40 3b 00 65 11 00 63 6e 08 00 69 bb 03 72 23 01 65 61 70 00 6e e0 73 2e 9b @ICONARA
- 38. 01 00 00 07 00 00 00 19 00 00 00 13 53 45 4c 45 43 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 73 00 04 81 00 00 6d 61 04 74 1e 75 6e c4 00 00 05 65 73 70 65 ee 65 65 7e 00 00 75 00 73 68 72 d0 00 74 15 #CASSANDRAEU 08 03 73 0d 77 69 2e 93 00 00 44 00 00 65 00 6f 6c 6e cb 00 00 35 00 0a 72 05 72 00 65 22 0d 00 32 00 6d 73 65 64 00 74 bb 73 20 73 bf 79 00 6d 00 00 00 8f 75 32 00 6b 09 61 03 0d 00 5a 65 7b 00 65 75 69 00 70 00 cd 40 6f 00 79 73 6c 00 68 20 c3 69 07 02 73 65 00 00 69 5e 00 6e 43 00 70 72 0d 02 6c b6 00 74 58 00 61 5f 00 00 40 3b 00 65 11 00 63 6e 08 00 69 bb 03 72 23 01 65 61 70 00 6e e0 73 2e 9b @ICONARA
- 39. 01 00 00 07 00 00 00 19 00 00 00 13 53 45 4c 45 43 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 73 00 04 81 00 00 m a 04 74 1e 75 6e c4 00 00 05 e s 70 65 ee 65 65 7e 00 00 75 00 s 68 72 d0 00 74 15 #CASSANDRAEU 08 03 73 0d w 69 2e 93 00 00 44 00 00 65 00 o 6c 6e cb 00 00 35 00 0a 72 05 r 00 65 22 0d 00 32 00 6d 73 e d 00 74 bb 73 20 73 bf 79 00 m 00 00 00 8f 75 32 00 6b 09 a 03 0d 00 5a 65 7b 00 65 u i 00 70 00 cd 40 6f 00 79 s l 00 68 20 c3 69 07 02 73 e 00 00 69 5e 00 6e 43 00 70 r 0d 02 6c b6 00 74 58 00 61 _ 00 00 40 3b 00 65 11 00 63 n 08 00 69 bb 03 72 23 01 65 a p 00 6e e0 73 2e 9b @ICONARA
- 40. 01 00 00 07 00 00 00 19 00 00 00 13 53 45 4c 45 43 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 73 00 04 81 00 00 6d 61 04 74 1e 75 6e c4 00 00 05 65 73 70 65 ee 65 65 7e 00 00 75 00 73 68 72 d0 00 74 15 #CASSANDRAEU 08 03 73 0d 77 69 2e 93 00 00 44 00 00 65 00 6f 6c 6e cb 00 00 35 00 0a 72 05 72 00 65 22 0d 00 32 00 6d 73 65 64 00 74 bb 73 20 73 bf 79 00 6d 00 00 00 8f 75 32 00 6b 09 61 03 0d 00 5a 65 7b 00 65 75 69 00 70 00 cd 40 6f 00 79 73 6c 00 68 20 c3 69 07 02 73 65 00 00 69 5e 00 6e 43 00 70 72 0d 02 6c b6 00 74 58 00 61 5f 00 00 40 3b 00 65 11 00 63 6e 08 00 69 bb 03 72 23 01 65 61 70 00 6e e0 73 2e 9b @ICONARA
- 41. 01 00 00 07 00 00 00 19 00 00 00 13 53 45 4c 45 43 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 73 00 04 81 00 00 6d 61 04 t 1e u n c4 00 00 05 65 73 p e ee e e 7e 00 00 75 00 73 h r d0 00 t 15 #CASSANDRAEU 08 03 73 0d 77 i . 93 00 00 44 00 00 65 00 6f l n cb 00 00 35 00 0a 72 05 72 00 e 22 0d 00 32 00 6d 73 65 64 00 t bb s 20 73 bf 79 00 6d 00 00 00 8f u 32 00 6b 09 61 03 0e 00 5a e 7b 00 65 75 69 00 p 00 cd @ 6f 00 79 73 6c 00 h 20 c3 i 07 02 73 65 00 00 i 5e 00 n 43 00 70 72 0d 02 l b6 00 t 58 00 61 5f 00 00 @ 3b 00 e 11 00 63 6e 08 00 i bb 03 r 23 01 65 61 70 00 n e0 s . 9b @ICONARA
- 42. 01 00 00 07 00 00 00 19 00 00 00 13 53 45 4c 45 43 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 73 00 04 81 00 00 6d 61 04 74 1e 75 6e c4 00 00 05 65 73 70 65 ee 65 65 7e 00 00 75 00 73 68 72 d0 00 74 15 #CASSANDRAEU 08 03 73 0d 77 69 2e 93 00 00 44 00 00 65 00 6f 6c 6e cb 00 00 35 00 0a 72 05 72 00 65 22 0d 00 32 00 6d 73 65 64 00 74 bb 73 20 73 bf 79 00 6d 00 00 00 8f 75 32 00 6b 09 61 03 0d 00 5a 65 7b 00 65 75 69 00 70 00 cd 40 6f 00 79 73 6c 00 68 20 c3 69 07 02 73 65 00 00 69 5e 00 6e 43 00 70 72 0d 02 6c b6 00 74 58 00 61 5f 00 00 40 3b 00 65 11 00 63 6e 08 00 69 bb 03 72 23 01 65 61 70 00 6e e0 73 2e 9b @ICONARA
- 45. 01 43 48 20 00 03 09 00 00 00 2a 00 00 00 26 53 45 4c 45 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 20 57 45 52 45 20 75 73 65 72 5f 6e 61 6d 65 20 3d 3f 81 7f 00 63 6e 00 1e 01 65 61 03 7a 00 00 6d #CASSANDRAEU 08 82 00 05 65 00 d2 00 75 00 00 3c 01 73 0d 00 4e 00 65 3e 8a 0a 72 00 f3 6d 73 00 35 79 00 00 51 6b 09 04 71 65 75 00 a5 79 73 10 2f 73 65 ca 00 70 72 48 00 61 5f @ICONARA
- 46. 01 43 48 20 00 03 09 00 00 00 2a 00 00 00 26 53 45 4c 45 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 20 57 45 52 45 20 75 73 65 72 5f 6e 61 6d 65 20 3d 3f 81 7f 00 63 6e 00 1e 01 65 61 03 7a 00 00 6d #CASSANDRAEU 08 82 00 05 65 00 d2 00 75 00 00 3c 01 73 0d 00 4e 00 65 3e 8a 0a 72 00 f3 6d 73 00 35 79 00 00 51 6b 09 04 71 65 75 00 a5 79 73 10 2f 73 65 ca 00 70 72 48 00 61 5f @ICONARA
- 47. 01 00 03 09 00 00 00 2a 00 00 00 26 C T * F R O M u s H E R E u s e r _ n a ? 81 7f 00 63 6e 00 1e 01 65 61 03 7a 00 00 6d #CASSANDRAEU 08 82 00 05 65 00 d2 00 75 00 00 3c 01 73 0d 00 4e 00 65 3e 8a 0a 72 00 f3 6d 73 00 35 79 00 00 51 6b 09 04 71 65 75 S e m E r e L E W = 00 a5 79 73 10 2f 73 65 ca 00 70 72 48 00 61 5f @ICONARA
- 48. 01 43 48 20 00 03 09 00 00 00 2a 00 00 00 26 53 45 4c 45 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 20 57 45 52 45 20 75 73 65 72 5f 6e 61 6d 65 20 3d 3f 81 7f 00 63 6e 00 1e 01 65 61 03 7a 00 00 6d #CASSANDRAEU 08 82 00 05 65 00 d2 00 75 00 00 3c 01 73 0d 00 4e 00 65 3e 8a 0a 72 00 f3 6d 73 00 35 79 00 00 51 6b 09 04 71 65 75 00 a5 79 73 10 2f 73 65 ca 00 70 72 48 00 61 5f @ICONARA
- 49. 01 43 48 20 00 03 09 00 00 00 2a 00 00 00 26 53 45 4c 45 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 20 57 45 52 45 20 75 73 65 72 5f 6e 61 6d 65 20 3d 3f 81 7f 00 63 6e 00 1e 01 65 61 03 7a 00 00 6d #CASSANDRAEU 08 82 00 05 65 00 d2 00 75 00 00 3c 01 73 0d 00 4e 00 65 3e 8a 0a 72 00 f3 6d 73 00 35 79 00 00 51 6b 09 04 71 65 75 00 a5 79 73 10 2f 73 65 ca 00 70 72 48 00 61 5f @ICONARA
- 50. 01 43 48 20 00 03 09 00 00 00 2a 00 00 00 26 53 45 4c 45 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 20 57 45 52 45 20 75 73 65 72 5f 6e 61 6d 65 20 3d 3f 81 7f 00 63 6e 00 1e 01 65 61 03 7a 00 00 6d #CASSANDRAEU 08 82 00 05 65 00 d2 00 75 00 00 3c 01 73 0d 00 4e 00 65 3e 8a 0a 72 00 f3 6d 73 00 35 79 00 00 51 6b 09 04 71 65 75 00 a5 79 73 10 2f 73 65 ca 00 70 72 48 00 61 5f @ICONARA
- 51. 01 43 48 20 00 03 09 00 00 00 2a 00 00 00 26 53 45 4c 45 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 20 57 45 52 45 20 75 73 65 72 5f 6e 61 6d 65 20 3d 3f 81 7f 00 63 n 00 1e 01 65 a 03 7a 00 00 m #CASSANDRAEU 08 82 00 05 e 00 d2 00 75 00 00 3c 01 73 0d 00 4e 00 65 3e 8a 0a 72 00 f3 6d 73 00 35 79 00 00 04 00 10 ca 48 51 71 a5 2f 00 00 6b 65 79 73 70 61 09 u s e r _ @ICONARA
- 52. 01 43 48 20 00 03 09 00 00 00 2a 00 00 00 26 53 45 4c 45 54 20 2a 20 46 52 4f 4d 20 75 73 65 72 20 57 45 52 45 20 75 73 65 72 5f 6e 61 6d 65 20 3d 3f 81 7f 00 63 6e 00 1e 01 65 61 03 7a 00 00 6d #CASSANDRAEU 08 82 00 05 65 00 d2 00 75 00 00 3c 01 73 0d 00 4e 00 65 3e 8a 0a 72 00 f3 6d 73 00 35 79 00 00 51 6b 09 04 71 65 75 00 a5 79 73 10 2f 73 65 ca 00 70 72 48 00 61 5f @ICONARA
- 53. STREAM 06 STREAM 07 STREAM 08 STREAM 09 STREAM 0a STREAM 0b STREAM 0c STREAM 0d STREAM 0e STREAM 0f STREAM 10 #CASSANDRAEU @ICONARA
- 55. THE HARD PART IS NOT THE PROTOCOL #CASSANDRAEU @ICONARA
- 56. THE DISTRIBUTED SYSTEM INCLUDES THE CLIENT #CASSANDRAEU @ICONARA
- 59. Map: a [short] n indicating the size of the map, followed by n entries. Each entry is composed of two [short bytes] representing the key and the value of the entry map. #CASSANDRAEU @ICONARA
- 63. Building a CQL driver Theo Hultberg | Chief Architect, Burt #CASSANDRAEU CASSANDRASUMMITEU