The document discusses Intravert, a new transport for Apache Cassandra that uses HTTP and JSON. Some key points made include: - Intravert aims to improve on existing transports by using HTTP and JSON to make it easier to use, secure, and test from a browser. - It was built using Vert.x for its event-driven and modular architecture. - Intravert examples demonstrate how to perform common Cassandra operations like slices, sets, and composites using a simple REST-like syntax with JSON payloads. - Features discussed include flexible batching, server-side filtering, and "getref" to use results of one operation in another.

1. Intravert
Experimental
Transport for Apache
Cassandra
Friday, April 5, 13

2. Hi Folks!
I’m Nate
@zznate
Friday, April 5, 13

3. API Management
API Analytics
API Tools
Friday, April 5, 13

4. Vert.x + Cassandra = ?
Friday, April 5, 13

5. But first:
Architectural stuff
Friday, April 5, 13

6. Collapsed for brevity.
see slides 6-31 from this presentation:
http://www.slideshare.net/zznate/
apachecon-cassandra-transport
Friday, April 5, 13

7. So there are options,
why create something
new?
Friday, April 5, 13

8. Common client
patterns emerged
Friday, April 5, 13

9. union operations
aggregations
filtering
joins (round-trip required!)
redundant data on insertion
Friday, April 5, 13

10. These client patterns
are wasteful.
Friday, April 5, 13

11. Lots of CPU and memory
burned (server and client)
Lots of data on the wire
won’t be used (ser/deSer
cost)
Friday, April 5, 13

12. One more thing about
CQL...
Friday, April 5, 13

13. “If [they] think that CQL is the
answer to usability then I just
won. We at least know where
our problems are.”
- 10gen exec.
Friday, April 5, 13

14. Transports in sum
Friday, April 5, 13

15. Thrift:
I can has distributed
computing degree
Friday, April 5, 13

16. CQL:
MOAR TOOLz!!!
Friday, April 5, 13

17. IMO: In 2013, binary
protocols with
idiomatic clients
misses the market.
Friday, April 5, 13

18. I love writing apps in
Java (sometimes
python), but...
Friday, April 5, 13

19. The most popular
application framework
these days:
Friday, April 5, 13

20. The most popular
application framework
these days:
HTML5
Friday, April 5, 13

21. and thus...
Intravert
Friday, April 5, 13

22. Any new transport had
to be HTTP based
Friday, April 5, 13

23. Easy to use
Easy to secure
Easy to compress
You can test with a
browser!
Friday, April 5, 13

24. The payload had to be
JSON based
Friday, April 5, 13

25. Quick Vert.x summary
Friday, April 5, 13

26. - Event-driven IO (Netty)
- Message bus
- Runtime load/unload of
modules
- Polyglot support via
invokeDynamic in JDK7
http://vertx.io
Friday, April 5, 13

27. Initial use case:
Server side indexing
Friday, April 5, 13

28. Easy to construct most
common operations
Friday, April 5, 13

29. Simple REST semantics
POST /myks/mycf/key1
{“uname”:”zznate”}
GET /myks/mycf/key1/uname
{”zznate”}
Friday, April 5, 13

30. Command-driven JSON
payload
Friday, April 5, 13

31. Extensible and transparent
Ordered operations
Not tied to any predefined
notions
Friday, April 5, 13

32. Benefits of doing this
with Vert.x
Friday, April 5, 13

33. Message bus flexibility
Configure which modules
to load (read-only nodes!)
Hot deploy of fixes and new
features
Friday, April 5, 13

34. Cassandra is best-of-
breed for a lot of things.
So we used it as a
framework.
Friday, April 5, 13

35. Example Intravert
Operations
Friday, April 5, 13

36. Slice:
{"id":6,
"type":"slice",
"op":{
"end":"9",
"rowkey":"5",
"size":4,
"start":"1"}
}
Friday, April 5, 13

37. Set:
{"id":2,
"type":"SET",
"op":{
"rowkey":"key1",
"uname":"zznate",
"email":"zznate.m@gmail.com",
"age":37}
}
Friday, April 5, 13

38. Easy to use Composites
Friday, April 5, 13

39. {"id":1,
"type":"SET",
"op":{
"rowkey":"key1",
"COMP_NAME":[
"37",
"zznate"
],
"value":"key1",
}
}
Friday, April 5, 13

40. One or more commands
per payload
Friday, April 5, 13

41. Friday, April 5, 13

42. Flexible batching
- batch reads and writes
- different keyspaces in
same op
- change ks/cf mid-op
- streaming (soon)
Friday, April 5, 13

43. Server-side Filtering
Friday, April 5, 13

44. {
"type": "CREATEFILTER",
"op": {
"name": "stouts",
"spec": "javascript",
"value": "function(row) { if (row['value'] == 'Breakfast Stout') return row;
else return null; }"
}
},
{
"type": "FILTERMODE",
"op": {
"name": "stouts",
"on": true
}
},
{
"type": "SLICE",
"op": {
"rowkey": "beers",
"start": "Allagash",
"end": "Sierra Nevada",
"size": 9
}
}
Friday, April 5, 13

45. {
"exception":null,
"exceptionId":null,
"opsRes": {
"0":"OK",
"1":"OK",
"2":"OK",
"3":"OK",
"4":"OK",
"5":"OK",
"6":[{
"name":"Founders",
"value":"Breakfast Stout"
}]
}}
Friday, April 5, 13

46. GetRef:
Results of one operation as
input from another
Friday, April 5, 13

47. {
"type": "GET",
"op": {
"rowkey": "getref_test", "name": "col1"
}
},
{
"type": "SET",
"op": {
"rowkey": "getref_test", "name": "col3",
"value": {
"type": "GETREF",
"op": {
"resultref": 4, "wanted": "value"
}
}
}
},
{
"type": "GET",
"op": {
"rowkey": "getref_test",
"name": "col3"
}
}
Friday, April 5, 13

48. “Triggers”
- Perform complex multi-step
operations server side
- Examine and change request
objects
- Interface directly with IntraVert
- Interface directly with Cassandra
(StorageProxy, CFMetaData, etc)
Friday, April 5, 13

49. Multi-Processors:
Shape results with a union
of operations
Friday, April 5, 13

50. Prepared Request
Statement:
Requests saved server side
- send only the bind
variables
Friday, April 5, 13

51. CQL support built-in.
Friday, April 5, 13

52. What’s missing?
Friday, April 5, 13

53. Security (Shiro integration
coming soon)
Distribution semantics
Cassandra-REST
HBASE-like scanners
Friday, April 5, 13

54. github.com/zznate/
intravert-ug
Friday, April 5, 13