[CASSANDRA-3721] Staggering repair

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 1.1.1
• Assignee: Vijay
• Reporter: Vijay

Authors

Vijay

Reviewers

Sylvain Lebresne

• Created: 10/Jan/12 22:03
• Updated: 16/Apr/19 09:32
• Resolved: 15/Feb/12 09:51

Description

Currently repair runs on all the nodes at once and causing the range of data to be hot (higher latency on reads).

Sequence:
1) Send a repair request to all of the nodes so we can hold the references of the SSTables (point at which repair was initiated)
2) Send Validation on one node at a time (once completed will release references).
3) Hold the reference of the tree in the requesting node and once everything is complete start diff.

We can also serialize the streaming part not more than 1 node is involved in the streaming.