szetszwo commented on code in PR #714:
URL: https://github.com/apache/ratis/pull/714#discussion_r947049950
##########
ratis-common/src/main/java/org/apache/ratis/protocol/RaftGroup.java:
##########
@@ -62,7 +62,12 @@ private RaftGroup(RaftGroupId groupId, Iterable<RaftPeer>
peers) {
this.peers = Collections.emptyMap();
} else {
final Map<RaftPeerId, RaftPeer> map = new HashMap<>();
- peers.forEach(p -> map.put(p.getId(), p));
+ peers.forEach(p -> {
+ Preconditions.assertTrue(!map.containsKey(p.getId()),
+ () -> "PeerId " + p.getId() + " has already appeared in this
group.");
Review Comment:
Let's use assertUnique, i.e.
```java
+++ b/ratis-common/src/main/java/org/apache/ratis/protocol/RaftGroup.java
@@ -61,6 +61,7 @@ public final class RaftGroup {
if (peers == null || !peers.iterator().hasNext()) {
this.peers = Collections.emptyMap();
} else {
+ Preconditions.assertUnique(peers);
final Map<RaftPeerId, RaftPeer> map = new HashMap<>();
peers.forEach(p -> map.put(p.getId(), p));
this.peers = Collections.unmodifiableMap(map);
```
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