ivankelly commented on a change in pull request #1549: offloadPrefix 
implementation for managed ledger
URL: https://github.com/apache/incubator-pulsar/pull/1549#discussion_r181899488
 
 

 ##########
 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);
+                return;
+            }
+
+            long current = ledgers.lastKey();
+
+            // the first ledger which will not be offloaded. Defaults to 
current,
+            // in the case that the whole headmap is offloaded. Otherwise it 
will
+            // be set as we iterate through the headmap values
+            long firstLedgerRetained = current;
+            for (LedgerInfo ls : ledgers.headMap(current).values()) {
+                if (requestOffloadTo.getLedgerId() > ls.getLedgerId()) {
+                    if (!ls.hasOffloadContext()) {
+                        ledgersToOffload.add(ls);
+                    }
+                } else {
+                    firstLedgerRetained = ls.getLedgerId();
+                    break;
+                }
+            }
+            firstUnoffloaded = PositionImpl.get(firstLedgerRetained, 0);
+        }
+
+        if (ledgersToOffload.isEmpty()) {
+            callback.offloadComplete(firstUnoffloaded, ctx);
+            return;
+        }
+
+        log.info("[{}] Going to offload ledgers {}", name,
+                 ledgersToOffload.stream().map(l -> 
l.getLedgerId()).collect(Collectors.toList()));
+        List< Pair<Long, CompletableFuture<byte[]>> > contexts = 
ledgersToOffload.stream()
+            .map(info -> {
+                    long ledgerId = info.getLedgerId();
+                    Map<String, String> extraMetadata = 
ImmutableMap.of("ManagedLedgerName", name);
+                    CompletableFuture<byte[]> context = 
getLedgerHandle(ledgerId).thenCompose(
+                            readHandle -> 
config.getLedgerOffloader().offload(readHandle, extraMetadata));
+                    return Pair.of(ledgerId, context);
+                }).collect(Collectors.toList());
+
+        CompletableFuture.allOf(contexts.stream().map(p -> 
p.getRight()).toArray(CompletableFuture[]::new))
+            .whenComplete((ignore, offloadException) -> {
+                    // If any of the offload operations failed 
offloadException will
+                    // be set. However some of the operations could have been 
successful.
+                    // If so, save the contexts for the successful prefix and 
notify the client
+                    // of the error if any occurred.
+                    List<Pair<Long, byte[]>> successfulOffloads = 
Lists.newArrayList();
+                    int errors = 0;
+                    synchronized (this) {
+                        ledgersListMutex.lock();
+
+                        // loop through results of offload operations. If an 
error occurred
+                        // check that the ledger still exists for the ML. If 
not, then it was
+                        // trimmed and the error can be ignored.
+                        for (Pair<Long, CompletableFuture<byte[]>> context : 
contexts) {
+                            if (context.getRight().isCompletedExceptionally()) 
{
+                                if (ledgers.containsKey(context.getLeft())) {
+                                    errors++;
+                                }
+                            } else {
+                                
successfulOffloads.add(Pair.of(context.getLeft(), context.getRight().join()));
+                            }
+                        }
+                        ledgersListMutex.unlock();
+                    }
+                    log.info("[{}] All offload operations complete, {} 
successful, {} errors",
+                             name, successfulOffloads.size(), errors);
+
+                    int errorsToReport = errors; // effectively final so can 
be used in lambda
+                    if (successfulOffloads.size() > 0) {
+                        
updateLedgerInfoForOffloaded(successfulOffloads).whenComplete(
+                                (ignore2, exception) -> {
+                                    if (exception != null) {
+                                        callback.offloadFailed(new 
ManagedLedgerException(exception), ctx);
+                                    } else if (offloadException != null && 
errorsToReport > 0) {
+                                        callback.offloadFailed(new 
ManagedLedgerException(offloadException), ctx);
+                                    } else {
+                                        
callback.offloadComplete(firstUnoffloaded, ctx);
+                                    }
+                                });
+                    } else {
+                        // All failed, so throw up the error
+                        callback.offloadFailed(new 
ManagedLedgerException(offloadException), ctx);
+                    }
+                });
     }
 
+    private CompletableFuture<Void> 
updateLedgerInfoForOffloaded(List<Pair<Long, byte[]>> contexts) {
+        CompletableFuture<Void> promise = new CompletableFuture<>();
+        synchronized (this) {
+            ledgersListMutex.lock();
+
+            contexts.forEach((context) -> {
+                    long ledgerId = context.getLeft();
+                    LedgerInfo oldInfo = ledgers.get(ledgerId);
+                    if (oldInfo == null) {
+                        cleanupOffloadedOnFailure(context.getLeft(), 
context.getRight(),
 
 Review comment:
   I'll change the offloader to take a UUID, and remove the context stuff 
(since it's not useful since we wouldn't be able to use it to find the object 
since we need to know all parameters before creating it).

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