[CASSANDRA-982] read repair on quorum consistencylevel

• Type: New Feature
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 0.7.1
• Assignee: Jonathan Ellis
• Reporter: Jonathan Ellis

Authors

Jonathan Ellis

Reviewers

Daniel Doubleday

• Created: 15/Apr/10 14:53
• Updated: 16/Apr/19 09:33
• Resolved: 05/Jan/11 07:10

Description

CASSANDRA-930 made read repair "fuzzy optional," but this only helps with ConsistencyLevel.ONE:

• Quorum reads always send requests to all nodes
• only the first Quorum's worth of responses get compared

So what we'd like to do two changes:

• only send read requests to the closest R live nodes
• if read repair is enabled, also compare results from the other nodes in the background

Issue Links

• is related to: CASSANDRA-1985 read repair on CL.ONE regression