hachikuji commented on a change in pull request #10913:
URL: https://github.com/apache/kafka/pull/10913#discussion_r660021011
##########
File path: raft/src/main/java/org/apache/kafka/raft/KafkaRaftClient.java
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@@ -2250,7 +2249,40 @@ private Long append(int epoch, List<T> records, boolean
isAtomic) {
@Override
public void resign(int epoch) {
- throw new UnsupportedOperationException();
+ if (epoch < 0) {
+ throw new IllegalArgumentException("Attempt to resign from an
invalid negative epoch " + epoch);
+ }
+
+ if (!quorum.isVoter()) {
+ throw new IllegalArgumentException("Attempt to resign by a
non-voter");
+ }
+
+ LeaderAndEpoch leaderAndEpoch = leaderAndEpoch();
+ int currentEpoch = leaderAndEpoch.epoch();
+
+ if (epoch > currentEpoch) {
+ throw new IllegalArgumentException("Attempt to resign from epoch "
+ epoch +
+ " which is larger than the current epoch " + currentEpoch);
+ } else if (epoch < currentEpoch) {
+ // If the passed epoch is smaller than the current epoch, then it
might mean
+ // that the listener has not been notified about a leader change
that already
+ // took place. In this case, we consider the call as already
fulfilled and
+ // take no further action.
+ return;
+ } else if (!leaderAndEpoch.isLeader(quorum.localIdOrThrow())) {
Review comment:
If the epoch has moved on, then the leader check is likely to fail, so
the current order seems to make sense. We don't keep a history of previous
states, so I think the best we can do is catch cases where the passed epoch
does not make sense with the current state.
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