mumrah commented on a change in pull request #10913:
URL: https://github.com/apache/kafka/pull/10913#discussion_r659989672
##########
File path: raft/src/main/java/org/apache/kafka/raft/KafkaRaftClient.java
##########
@@ -2250,7 +2250,42 @@ 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");
Review comment:
Would IllegalStateException be better here?
##########
File path: raft/src/main/java/org/apache/kafka/raft/KafkaRaftClient.java
##########
@@ -1914,8 +1915,7 @@ private long pollLeader(long currentTimeMs) {
LeaderState<T> state = quorum.leaderStateOrThrow();
maybeFireLeaderChange(state);
- GracefulShutdown shutdown = this.shutdown.get();
- if (shutdown != null) {
+ if (shutdown.get() != null || state.isResignRequested()) {
Review comment:
unrelated, but maybe worth creating helper method that returns
`Optional<GracefulShutdown>` to avoid these null checks throughout
##########
File path: raft/src/main/java/org/apache/kafka/raft/KafkaRaftClient.java
##########
@@ -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:
Does it make sense to do this check before the epoch validation? If
we're not the leader and received an old epoch (which, if i understand, seems
likely if we're _not_ the leader anymore), we will silently ignore in the above
case.
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