databendlabs / openraft / 28153627511

87%

Build Type

push

github

Committed by drmingdrmer

Commit Message

fix: adopt higher vote from rejected Pre-Vote

# Summary

A rejected Pre-Vote response now advances the requester to the
responder's higher vote in non-committed form, allowing stale nodes to
learn newer term information without granting a real vote.

# Details

Pre-Vote request handling remains side-effect-free, but responses still
carry vote state from peers. Ignoring a higher vote from a rejection can
leave a lower-term cohort retrying forever from stale terms, which is
the election deadlock described in issue #1796.

The fix mirrors the rejected real-vote path while preserving Pre-Vote
semantics: only strictly higher votes are adopted, and the adopted vote
is made non-committed before persistence. The commit also updates the
protocol note and adds both engine-level coverage and a top-level
integration reproduction.

Coverage Stats

4 of 4 new or added lines in 1 file covered. (100.0%)

6 existing lines in 2 files now uncovered.

16844 of 19385 relevant lines covered (86.89%)

161159.04 hits per line