void-ptr974 commented on code in PR #4789:
URL: https://github.com/apache/bookkeeper/pull/4789#discussion_r3288706499


##########
bookkeeper-server/src/main/java/org/apache/bookkeeper/client/BatchedReadOp.java:
##########
@@ -160,32 +165,41 @@ boolean complete(int bookieIndex, BookieId host, final 
ByteBufList bufList) {
             if (isComplete()) {
                 return false;
             }
-            if (!complete.getAndSet(true)) {
+
+            /*
+             * Verify the whole batch before creating LedgerEntryImpl 
instances. If any entry fails
+             * digest verification, no partial entries are retained and 
readEntriesComplete() releases
+             * the retained ByteBufList after this method returns false.
+             */
+            for (int i = 0; i < bufList.size(); i++) {
+                ByteBuf buffer = bufList.getBuffer(i);
+                try {
+                    lh.macManager.verifyDigestAndReturnData(eId + i, buffer);

Review Comment:
   Done. The batch read now returns the verified prefix before a later digest 
mismatch, while preserving retry behavior when the first entry mismatches. 
Added test coverage in 
`testDigestMismatchAfterPartialVerificationReturnsVerifiedPrefix`. Pushed as 
a5ee51a9dd.



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