merlimat commented on a change in pull request #1218: Support LacPiggyback, 
LongPoll and ExplicitLac in db ledger storage
URL: https://github.com/apache/bookkeeper/pull/1218#discussion_r171345374
 
 

 ##########
 File path: 
bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/storage/ldb/DbLedgerStorage.java
 ##########
 @@ -712,23 +874,38 @@ public EntryLogger getEntryLogger() {
 
     @Override
     public long getLastAddConfirmed(long ledgerId) throws IOException {
-        throw new UnsupportedOperationException();
+        TransientLedgerInfo ledgerInfo = 
transientLedgerInfoCache.getIfPresent(ledgerId);
+        Long lac = null != ledgerInfo ? ledgerInfo.getLastAddConfirmed() : 
null;
+        if (null == lac) {
+            ByteBuf bb = getEntry(ledgerId, BookieProtocol.LAST_ADD_CONFIRMED);
+            bb.skipBytes(2 * Long.BYTES); // skip ledger id and entry id
+            lac = bb.readLong();
 
 Review comment:
   `bb` should be released at this point

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