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[ISSUE #325] Fix unable to auto recover after follower isolation #326

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[ISSUE #325] Fix unable to auto recover after follower isolation #326

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9d791bc
[ISSUE #325] Fix unable to auto recover after follower isolation
yuz10 Dec 14, 2024
951489b
fix
yuz10 Dec 14, 2024
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14 changes: 8 additions & 6 deletions dledger/src/main/java/io/openmessaging/storage/dledger/DLedgerLeaderElector.java
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Original file line number Diff line number Diff line change
Expand Up @@ -204,6 +204,14 @@ public CompletableFuture<VoteResponse> handleVote(VoteRequest request, boolean s
return CompletableFuture.completedFuture(new VoteResponse(request).term(memberState.currTerm()).voteResult(VoteResponse.RESULT.REJECT_UNEXPECTED_LEADER));
}

if (request.getTerm() > memberState.currTerm()) {
//stepped down by larger term
changeRoleToCandidate(request.getTerm());
needIncreaseTermImmediately = true;
//only can handleVote when the term is consistent
return CompletableFuture.completedFuture(new VoteResponse(request).term(memberState.currTerm()).voteResult(VoteResponse.RESULT.REJECT_TERM_NOT_READY));
}

if (request.getLedgerEndTerm() < memberState.getLedgerEndTerm()) {
return CompletableFuture.completedFuture(new VoteResponse(request).term(memberState.currTerm()).voteResult(VoteResponse.RESULT.REJECT_EXPIRED_LEDGER_TERM));
} else if (request.getLedgerEndTerm() == memberState.getLedgerEndTerm() && request.getLedgerEndIndex() < memberState.getLedgerEndIndex()) {
Expand All @@ -224,12 +232,6 @@ public CompletableFuture<VoteResponse> handleVote(VoteRequest request, boolean s
return CompletableFuture.completedFuture(new VoteResponse(request).term(memberState.currTerm()).voteResult(VoteResponse.RESULT.REJECT_ALREADY_VOTED));
}
}
} else {
//stepped down by larger term
changeRoleToCandidate(request.getTerm());
needIncreaseTermImmediately = true;
//only can handleVote when the term is consistent
return CompletableFuture.completedFuture(new VoteResponse(request).term(memberState.currTerm()).voteResult(VoteResponse.RESULT.REJECT_TERM_NOT_READY));
}

if (request.getTerm() < memberState.getLedgerEndTerm()) {
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