kezhuw commented on code in PR #2254:
URL: https://github.com/apache/zookeeper/pull/2254#discussion_r2122561575
##########
zookeeper-server/src/main/java/org/apache/zookeeper/server/ZKDatabase.java:
##########
@@ -320,17 +323,30 @@ public void addCommittedProposal(Request request) {
WriteLock wl = logLock.writeLock();
try {
wl.lock();
- if (committedLog.size() > commitLogCount) {
- committedLog.remove();
- minCommittedLog = committedLog.peek().getZxid();
- }
if (committedLog.isEmpty()) {
minCommittedLog = request.zxid;
maxCommittedLog = request.zxid;
+ } else if (request.zxid <= maxCommittedLog) {
+ // This could happen if lastProcessedZxid is rewinded and
database is re-synced.
+ // Currently, it only happens in test codes, but it should
also be safe for production path.
Review Comment:
`LoadFromLogTest::testRestore` fails without this. Here is the javadoc of
the test.
```java
/**
* Test we can restore the snapshot that has data ahead of the zxid
* of the snapshot file.
*/
```
https://github.com/apache/zookeeper/blob/aeadf574c0463e7e3db092b588033d8347989d4c/zookeeper-server/src/test/java/org/apache/zookeeper/test/LoadFromLogTest.java#L178-L182
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