StevenLuMT commented on code in PR #3522:
URL: https://github.com/apache/bookkeeper/pull/3522#discussion_r996372095


##########
bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/BookieImpl.java:
##########
@@ -935,9 +936,10 @@ private void addEntryInternal(LedgerDescriptor handle, 
ByteBuf entry,
 
         // journal `addEntry` should happen after the entry is added to ledger 
storage.
         // otherwise the journal entry can potentially be rolled before the 
ledger is created in ledger storage.
-        if (masterKeyCache.get(ledgerId) == null) {
+        if (masterKeyCache.getIfPresent(ledgerId) == null) {
             // Force the load into masterKey cache
-            byte[] oldValue = masterKeyCache.putIfAbsent(ledgerId, masterKey);
+            byte[] oldValue = masterKeyCache.getIfPresent(ledgerId);
+            masterKeyCache.put(ledgerId, masterKey);
             if (oldValue == null) {

Review Comment:
   > if we disable it by default nobody will use it, it will fall into the 
basket of "experimental features"
   
   @nicoloboschi 
   yes,I agree @eolivelli ,  We should use the new logic directly, and the old 
logic is a bug, which is easy to cause oom



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