[CASSANDRA-14723] Increase write availability during range movements

• Type: Improvement
• Status: Open
• Priority: Normal
• Resolution: Unresolved
• Fix Version/s: 5.x
• Component/s: Legacy/Coordination
• Assignee: Unassigned
• Reporter: Benedict Elliott Smith
• Created: 12/Sep/18 14:11
• Updated: 07/Mar/23 10:54

Description

If pending ranges were to be paired with their ‘natural’ replicas, instead of requiring QUORUM+#pending, we could instead require QUORUM, but count both owners of the pending range as a combined 1 - where they are only counted if both return success.

As an example, in a cluster with RF=3, a pending range movement would currently require 3 nodes to respond, so must include at least one of the pending nodes.  Under the proposed scheme, the 2 non-participating nodes could respond as normal to reach a QUORUM, not requiring either of the pending nodes to respond.

Issue Links

• relates to: CASSANDRA-8346 Paxos operation can use stale data during multiple range movements