lhotari commented on code in PR #4293:
URL: https://github.com/apache/bookkeeper/pull/4293#discussion_r1613017855


##########
bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/PerChannelBookieClient.java:
##########
@@ -700,14 +700,10 @@ void writeLac(final long ledgerId, final byte[] 
masterKey, final long lac, ByteB
                 .setVersion(ProtocolVersion.VERSION_THREE)
                 .setOperation(OperationType.WRITE_LAC)
                 .setTxnId(txnId);
-        ByteString body;
-        if (toSend.hasArray()) {
-            body = UnsafeByteOperations.unsafeWrap(toSend.array(), 
toSend.arrayOffset(), toSend.readableBytes());
-        } else if (toSend.size() == 1) {
-            body = 
UnsafeByteOperations.unsafeWrap(toSend.getBuffer(0).nioBuffer());
-        } else {
-            body = UnsafeByteOperations.unsafeWrap(toSend.toArray());
-        }
+        ByteString body = ByteStringUtil.byteBufListToByteString(toSend);
+        toSend.retain();

Review Comment:
   The ByteString doesn't handle the lifecycle of the buffers referenced by the 
ByteString. 
   It's the `toSend.retain()` which handles the lifecycle.
   The `cleanupActionFailedBeforeWrite` and `cleanupActionAfterWrite` 
parameters (`Runnable`s) are used to ensure that the reference count is 
properly decreased later.



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