ivankelly commented on a change in pull request #1549: offloadPrefix 
implementation for managed ledger
URL: https://github.com/apache/incubator-pulsar/pull/1549#discussion_r181391675
 
 

 ##########
 File path: 
managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
 ##########
 @@ -1850,9 +1854,172 @@ public void offloadFailed(ManagedLedgerException e, 
Object ctx) {
 
     @Override
     public void asyncOffloadPrefix(Position pos, OffloadCallback callback, 
Object ctx) {
-        callback.offloadFailed(new ManagedLedgerException("Not implemented"), 
ctx);
+        PositionImpl requestOffloadTo = (PositionImpl)pos;
+        if (!isValidPosition(requestOffloadTo)) {
+            callback.offloadFailed(new InvalidCursorPositionException("Invalid 
position for offload"), ctx);
+            return;
+        }
+
+        Position firstUnoffloaded;
+
+        List<LedgerInfo> ledgersToOffload = Lists.newArrayList();
+        synchronized (this) {
+            log.info("[{}] Start ledgersOffload. ledgers={} totalSize={}", 
name, ledgers.keySet(),
+                     TOTAL_SIZE_UPDATER.get(this));
+
+            if (STATE_UPDATER.get(this) == State.Closed) {
+                log.info("[{}] Ignoring offload request since the managed 
ledger was already closed", name);
+                callback.offloadFailed(new ManagedLedgerAlreadyClosedException(
+                                               "Can't offload closed managed 
ledger"), ctx);
 
 Review comment:
   done

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