hachikuji commented on a change in pull request #9531:
URL: https://github.com/apache/kafka/pull/9531#discussion_r519965008
##########
File path: raft/src/main/java/org/apache/kafka/raft/QuorumState.java
##########
@@ -21,18 +21,21 @@
import org.slf4j.Logger;
import java.io.IOException;
+import java.util.Collections;
import java.util.HashSet;
+import java.util.List;
import java.util.Optional;
import java.util.OptionalInt;
import java.util.Random;
import java.util.Set;
import java.util.stream.Collectors;
/**
- * This class is responsible for managing the current state of this node and
ensuring only
- * valid state transitions.
+ * This class is responsible for managing the current state of this node and
ensuring
+ * only valid state transitions. Below we define the possible state
transitions and
+ * how they are triggered:
*
- * Unattached =>
+ * Unattached|Resigned =>
Review comment:
Hmm.. The quorum size does not change because a leader resigns. If there
are 2N nodes in the cluster, then we always need N + 1 votes, so I don't think
this case is possible.
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