NoSQL Yes, But YesCQL, No?

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NoSQL Yes, But YesCQL, No?

  1. 1. NoSQL Yes, But YesCQL, No? Berlin Buzzwords June 7, 2011 Eric Evans eevans@rackspace.com @jericevans http://blog.sym-link.com
  2. 2. Cassandra Query Language● Structured query language for Apache Cassandra.● CQL for short (pronounced /siːkw əl/).● SQL alike (best effort).● An alternative to the existing API, not a replacement (not yet).● Available for use in Cassandra 0.8.0.
  3. 3. Wait, arent you the guy...?
  4. 4. So, is this a troll?
  5. 5. Gonna Give You Up. Never.
  6. 6. Naw.(not a troll, honest)
  7. 7. But, why?
  8. 8. Because the API sucks.
  9. 9. “Thrift sucks, ergo the API sucks”● Generated code (C++ compiler).● Loads of languages, but varying levels of support. ● PHP anyone?● Upstream alternating between extremes of combativeness and apathy. ● Patches ignored, (or refused). ● Loads of (serious )bugs ignored for long periods. ● Infrequent releases.
  10. 10. “Avro Does Not Suck, so...”1. Avro2. Something, something, something3. Profit!
  11. 11. And the API still sucks.
  12. 12. Brass Tacks● Unstable ● Too tightly coupled to internal APIs● Too difficult to use ● Very little abstraction (forces clients to abstract) ● Poor mental fit for query/data models
  13. 13. Back to the drawing board● RPC (Thrift, Avro, Protobuf, etc)● REST● Query language● Etc, etc
  14. 14. Back to the drawing board● RPC (Thrift, Avro, Protobuf, etc) ● Easy to implement ● Performant● REST● Query language● Etc, etc
  15. 15. Back to the drawing board● RPC (Thrift, Avro, Protobuf, etc) ● Easy to implement ● Performant● REST ● Little need for client abstraction● Query language● Etc, etc
  16. 16. Back to the drawing board● RPC (Thrift, Avro, Protobuf, etc) ● Easy to implement ● Performant● REST ● Little need for client abstraction● Query language ● Little need for client abstraction ● Reads well; What you see is what you get ● The Devil we all know● Etc, etc
  17. 17. Grok Thisfirstname = Column(name="firstname", value="Eric", timestamp=time)firstcosc = ColumnOrSuperColumn(column=firstname)lastname = Column(name="lastname", value="Evans", timestamp=time)lastcosc = ColumnOrSuperColumn(column=lastname)mutations = []mutations.append(Mutation(column_or_supercolumn=firstcosc))mutations.append(Mutation(column_or_supercolumn=lastcosc))client.batch_mutate(mutation_map={"eevans": {"table": mutations}}, consistency_level=ConsistencyLevel.ONE)
  18. 18. What about this?UPDATE tableSET firstname=Eric, lastname=EvansWHERE KEY=eevans
  19. 19. Grok Thisparent = ColumnParent(column_family="table")colnames = ["firstname", "lastname"]predicate = SlicePredicate(column_names=colnames)row = client.get_slice(key="eevans", column_parent=parent, predicate=predicate, consistency_level=CL.ONE)
  20. 20. And this?SELECT firstname, lastnameFROM tableWHERE KEY = eevans
  21. 21. Official(?) Drivers● Java (JDBC)● Python (DBAPI2)● Node.js● Twisted● PHP (coming soon?)● Ruby (coming soon?)
  22. 22. More Info● Docs (doc/cql/CQL.html)● http://www.datastax.com/docs/0.8/api/using_cql● http://caqel.deadcafe.org (live demo!)● cqlsh (interactive shell shipped w/ Python driver)

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