The document discusses adding a new "consistency level" statement to the Cassandra CLI to allow users to set the default consistency level when making requests. It describes modifying the ANTLR grammar to include a new token and statement for consistency level, and updating the CLI code to execute this new statement type by changing the hardcoded consistency level values. The changes were quickly merged, showing how Cassandra has an open community that values contributions to improve the tooling.

1. Hacking @ Cassandra CLI Edward Capriolo

3. ONE - Return as soon as one replica ACK

4. QUORUM – Most of the nodes ACK

5. ALL – All replicas must as knowledge

6. LOCAL_QUORUM - quorum of noes in DC

7. EACH_QUORUM - quorum of nodes in each DC

8. TWO – Two nodes – (multi-dc)

9. THREE – three nodes – (multi-dc)

11. Always read at ONE

12. DOH!! Makes it very hard to test these cool features!

13. Works using ANTLR

14. ANTLR used for many domain specific languages HIVE cli, CASSANDRA cli, etc

16. Open A ticket

18. NODE_LIST;

19. NODE_TRUNCATE;

20. NODE_ASSUME;

21. + NODE_CONSISTENCY_LEVEL;

22. Later on in file:

23. +CONSISTENCYLEVEL: 'CONSISTENCYLEVEL';

29. How does this statement work?

31. Patch was committed to 0.7.5 < 2 days

32. Everyone wins!