szetszwo commented on a change in pull request #560:
URL: https://github.com/apache/ratis/pull/560#discussion_r765703801
##########
File path:
ratis-server/src/main/java/org/apache/ratis/server/impl/RaftServerImpl.java
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@@ -583,6 +583,12 @@ synchronized void changeToCandidate(boolean
forceStartLeaderElection) {
if (state.shouldNotifyExtendedNoLeader()) {
stateMachine.followerEvent().notifyExtendedNoLeader(getRoleInfoProto());
}
+ // Candidate shall not start leader election in these cases in case of
+ // possible NPE caused by conf.getPeer().getPriority()
+ if (!getRaftConf().containsInBothConfs(getId())) {
+ LOG.warn("{} find invalid configuration {}, skip start leader election",
this, getRaftConf());
+ return;
+ }
Review comment:
The conf may be changed later on. Therefore, let's don't check it here
and check null in LeaderElection.getHigherPriorityPeers(..) as below.
```
private Set<RaftPeerId> getHigherPriorityPeers(RaftConfiguration conf) {
final Optional<Integer> priority =
Optional.ofNullable(conf.getPeer(server.getId())).map(RaftPeer::getPriority);
return conf.getAllPeers().stream()
.filter(peer -> priority.filter(p -> peer.getPriority() >
p).isPresent())
.map(RaftPeer::getId)
.collect(Collectors.toSet());
}
```
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