[GitHub] [ratis] szetszwo commented on a change in pull request #473: RATIS-1369. When there is no snapshot, the return snapshotIndex should be -1, not 0.

[GitBox <gi...@apache.org>]

szetszwo commented on a change in pull request #473:
URL: https://github.com/apache/ratis/pull/473#discussion_r620114615



##########
File path: ratis-server/src/main/java/org/apache/ratis/server/impl/ServerState.java
##########
@@ -431,7 +431,7 @@ private SnapshotInfo getLatestSnapshot() {
 
   long getLatestInstalledSnapshotIndex() {
     final TermIndex ti = latestInstalledSnapshot.get();
-    return ti != null? ti.getIndex(): 0L;
+    return ti != null? ti.getIndex(): -1L;

Review comment:
       Let's use `RaftLog.INVALID_LOG_INDEX` instead of -1.
   ```suggestion
       return ti != null? ti.getIndex(): RaftLog.INVALID_LOG_INDEX;
   ```

##########
File path: ratis-server/src/main/java/org/apache/ratis/server/impl/ServerState.java
##########
@@ -440,7 +440,7 @@ long getLatestInstalledSnapshotIndex() {
    */
   long getSnapshotIndex() {
     final SnapshotInfo s = getLatestSnapshot();
-    final long latestSnapshotIndex = s != null ? s.getIndex() : 0;
+    final long latestSnapshotIndex = s != null ? s.getIndex() : -1;

Review comment:
       Let's use `RaftLog.INVALID_LOG_INDEX` instead of -1.
   ```suggestion
       final long latestSnapshotIndex = s != null ? s.getIndex() : RaftLog.INVALID_LOG_INDEX;
   ```




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