Single buffer for small add requests

bookkeeper-server/src/main/java/org/apache/bookkeeper/client/LedgerFragmentReplicator.java

@@ -29,7 +29,9 @@
 import static org.apache.bookkeeper.replication.ReplicationStats.WRITE_DATA_LATENCY;
 
 import com.google.common.util.concurrent.RateLimiter;
+import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
+import io.netty.util.ReferenceCounted;
 import java.util.Enumeration;
 import java.util.HashSet;
 import java.util.Iterator;
@@ -403,17 +405,24 @@ public void readComplete(int rc, LedgerHandle lh,
                 numEntriesRead.inc();
                 numBytesRead.registerSuccessfulValue(dataLength);
 
-                ByteBufList toSend = lh.getDigestManager()
+                ReferenceCounted toSend = lh.getDigestManager()
                         .computeDigestAndPackageForSending(entryId,
                                 lh.getLastAddConfirmed(), entry.getLength(),
-                                Unpooled.wrappedBuffer(data, 0, data.length));
+                                Unpooled.wrappedBuffer(data, 0, data.length),
+                                lh.getLedgerKey(),
+                                0
+                                );
                 if (replicationThrottle != null) {
-                    updateAverageEntrySize(toSend.readableBytes());
+                    if (toSend instanceof ByteBuf) {
+                        updateAverageEntrySize(((ByteBuf) toSend).readableBytes());
+                    } else if (toSend instanceof ByteBufList) {
+                        updateAverageEntrySize(((ByteBufList) toSend).readableBytes());
+                    }
                 }
                 for (BookieId newBookie : newBookies) {
                     long startWriteEntryTime = MathUtils.nowInNano();
                     bkc.getBookieClient().addEntry(newBookie, lh.getId(),
-                            lh.getLedgerKey(), entryId, ByteBufList.clone(toSend),
+                            lh.getLedgerKey(), entryId, toSend,
                             multiWriteCallback, dataLength, BookieProtocol.FLAG_RECOVERY_ADD,
                             false, WriteFlag.NONE);
                     writeDataLatency.registerSuccessfulEvent(

bookkeeper-server/src/main/java/org/apache/bookkeeper/client/PendingAddOp.java

@@ -27,6 +27,7 @@
 import io.netty.util.Recycler;
 import io.netty.util.Recycler.Handle;
 import io.netty.util.ReferenceCountUtil;
+import io.netty.util.ReferenceCounted;
 import java.util.EnumSet;
 import java.util.HashSet;
 import java.util.List;
@@ -38,7 +39,6 @@
 import org.apache.bookkeeper.client.api.WriteFlag;
 import org.apache.bookkeeper.net.BookieId;
 import org.apache.bookkeeper.proto.BookkeeperInternalCallbacks.WriteCallback;
-import org.apache.bookkeeper.util.ByteBufList;
 import org.apache.bookkeeper.util.MathUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -56,7 +56,7 @@ class PendingAddOp implements Runnable, WriteCallback {
     private static final Logger LOG = LoggerFactory.getLogger(PendingAddOp.class);
 
     ByteBuf payload;
-    ByteBufList toSend;
+    ReferenceCounted toSend;
     AddCallbackWithLatency cb;
     Object ctx;
     long entryId;
@@ -257,9 +257,10 @@ public void run() {
         checkNotNull(lh);
         checkNotNull(lh.macManager);
 
+        int flags = isRecoveryAdd ? FLAG_RECOVERY_ADD | FLAG_HIGH_PRIORITY : FLAG_NONE;
         this.toSend = lh.macManager.computeDigestAndPackageForSending(
                 entryId, lh.lastAddConfirmed, currentLedgerLength,
-                payload);
+                payload, lh.ledgerKey, flags);
         // ownership of RefCounted ByteBuf was passed to computeDigestAndPackageForSending
         payload = null;
 

bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/AuthHandler.java

@@ -23,6 +23,7 @@
 import static org.apache.bookkeeper.auth.AuthProviderFactoryFactory.AUTHENTICATION_DISABLED_PLUGIN_NAME;
 
 import com.google.protobuf.ByteString;
+import io.netty.buffer.ByteBuf;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelDuplexHandler;
 import io.netty.channel.ChannelHandlerContext;
@@ -39,6 +40,7 @@
 import org.apache.bookkeeper.auth.ClientAuthProvider;
 import org.apache.bookkeeper.client.BKException;
 import org.apache.bookkeeper.proto.BookkeeperProtocol.AuthMessage;
+import org.apache.bookkeeper.util.ByteBufList;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -358,8 +360,10 @@ public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise)
                     } else {
                         waitingForAuth.add(msg);
                     }
+                } else if (msg instanceof ByteBuf || msg instanceof ByteBufList) {
+                    waitingForAuth.add(msg);
                 } else {
-                    LOG.info("dropping write of message {}", msg);
+                    LOG.info("[{}] dropping write of message {}", ctx.channel(), msg);
                 }
             }
         }

bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/BookieClient.java

@@ -20,6 +20,7 @@
  */
 package org.apache.bookkeeper.proto;
 
+import io.netty.util.ReferenceCounted;
 import java.util.EnumSet;
 import java.util.List;
 import java.util.concurrent.CompletableFuture;
@@ -139,7 +140,7 @@ void writeLac(BookieId address, long ledgerId, byte[] masterKey,
      *                   {@link org.apache.bookkeeper.client.api.WriteFlag}
      */
     void addEntry(BookieId address, long ledgerId, byte[] masterKey,
-                  long entryId, ByteBufList toSend, WriteCallback cb, Object ctx,
+                  long entryId, ReferenceCounted toSend, WriteCallback cb, Object ctx,
                   int options, boolean allowFastFail, EnumSet<WriteFlag> writeFlags);
 
     /**

bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/BookieClientImpl.java

@@ -32,6 +32,7 @@
 import io.netty.util.Recycler;
 import io.netty.util.Recycler.Handle;
 import io.netty.util.ReferenceCountUtil;
+import io.netty.util.ReferenceCounted;
 import io.netty.util.concurrent.DefaultThreadFactory;
 import java.io.IOException;
 import java.util.EnumSet;
@@ -301,7 +302,7 @@ public void addEntry(final BookieId addr,
                          final long ledgerId,
                          final byte[] masterKey,
                          final long entryId,
-                         final ByteBufList toSend,
+                         final ReferenceCounted toSend,
                          final WriteCallback cb,
                          final Object ctx,
                          final int options,
@@ -370,7 +371,7 @@ private static class ChannelReadyForAddEntryCallback
         private final Handle<ChannelReadyForAddEntryCallback> recyclerHandle;
 
         private BookieClientImpl bookieClient;
-        private ByteBufList toSend;
+        private ReferenceCounted toSend;
         private long ledgerId;
         private long entryId;
         private BookieId addr;
@@ -382,7 +383,7 @@ private static class ChannelReadyForAddEntryCallback
         private EnumSet<WriteFlag> writeFlags;
 
         static ChannelReadyForAddEntryCallback create(
-                BookieClientImpl bookieClient, ByteBufList toSend, long ledgerId,
+                BookieClientImpl bookieClient, ReferenceCounted toSend, long ledgerId,
                 long entryId, BookieId addr, Object ctx,
                 WriteCallback cb, int options, byte[] masterKey, boolean allowFastFail,
                 EnumSet<WriteFlag> writeFlags) {

bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/BookieProtoEncoding.java

@@ -428,7 +428,9 @@ public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise)
             if (LOG.isTraceEnabled()) {
                 LOG.trace("Encode request {} to channel {}.", msg, ctx.channel());
             }
-            if (msg instanceof BookkeeperProtocol.Request) {
+            if (msg instanceof ByteBuf || msg instanceof ByteBufList) {
+                ctx.write(msg, promise);
+            } else if (msg instanceof BookkeeperProtocol.Request) {
                 ctx.write(reqV3.encode(msg, ctx.alloc()), promise);
             } else if (msg instanceof BookieProtocol.Request) {
                 ctx.write(reqPreV3.encode(msg, ctx.alloc()), promise);

bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/PerChannelBookieClient.java

@@ -62,6 +62,7 @@
 import io.netty.util.Recycler;
 import io.netty.util.Recycler.Handle;
 import io.netty.util.ReferenceCountUtil;
+import io.netty.util.ReferenceCounted;
 import io.netty.util.concurrent.Future;
 import io.netty.util.concurrent.GenericFutureListener;
 import java.io.IOException;
@@ -771,7 +772,7 @@ void forceLedger(final long ledgerId, ForceLedgerCallback cb, Object ctx) {
      * @param writeFlags
      *          WriteFlags
      */
-    void addEntry(final long ledgerId, byte[] masterKey, final long entryId, ByteBufList toSend, WriteCallback cb,
+    void addEntry(final long ledgerId, byte[] masterKey, final long entryId, ReferenceCounted toSend, WriteCallback cb,
                   Object ctx, final int options, boolean allowFastFail, final EnumSet<WriteFlag> writeFlags) {
         Object request = null;
         CompletionKey completionKey = null;
@@ -784,9 +785,12 @@ void addEntry(final long ledgerId, byte[] masterKey, final long entryId, ByteBuf
                 return;
             }
             completionKey = acquireV2Key(ledgerId, entryId, OperationType.ADD_ENTRY);
-            request = BookieProtocol.AddRequest.create(
-                    BookieProtocol.CURRENT_PROTOCOL_VERSION, ledgerId, entryId,
-                    (short) options, masterKey, toSend);
+
+            if (toSend instanceof ByteBuf) {
+                request = ((ByteBuf) toSend).retainedDuplicate();
+            } else {
+                request = ByteBufList.clone((ByteBufList) toSend);
+            }
         } else {
             final long txnId = getTxnId();
             completionKey = new V3CompletionKey(txnId, OperationType.ADD_ENTRY);
@@ -801,11 +805,14 @@ void addEntry(final long ledgerId, byte[] masterKey, final long entryId, ByteBuf
             }
 
             ByteString body = null;
-            if (toSend.hasArray()) {
-                body = UnsafeByteOperations.unsafeWrap(toSend.array(), toSend.arrayOffset(), toSend.readableBytes());
+            ByteBufList bufToSend = (ByteBufList) toSend;
+
+            if (bufToSend.hasArray()) {
+                body = UnsafeByteOperations.unsafeWrap(bufToSend.array(), bufToSend.arrayOffset(),
+                        bufToSend.readableBytes());
             } else {
-                for (int i = 0; i < toSend.size(); i++) {
-                    ByteString piece = UnsafeByteOperations.unsafeWrap(toSend.getBuffer(i).nioBuffer());
+                for (int i = 0; i < bufToSend.size(); i++) {
+                    ByteString piece = UnsafeByteOperations.unsafeWrap(bufToSend.getBuffer(i).nioBuffer());
                     // use ByteString.concat to avoid byte[] allocation when toSend has multiple ByteBufs
                     body = (body == null) ? piece : body.concat(piece);
                 }

bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/checksum/DigestManager.java

@@ -22,10 +22,13 @@
 import io.netty.buffer.CompositeByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.util.ReferenceCountUtil;
+import io.netty.util.ReferenceCounted;
 import java.security.GeneralSecurityException;
 import java.security.NoSuchAlgorithmException;
 import org.apache.bookkeeper.client.BKException.BKDigestMatchException;
 import org.apache.bookkeeper.client.LedgerHandle;
+import org.apache.bookkeeper.proto.BookieProtoEncoding;
+import org.apache.bookkeeper.proto.BookieProtocol;
 import org.apache.bookkeeper.proto.DataFormats.LedgerMetadataFormat.DigestType;
 import org.apache.bookkeeper.util.ByteBufList;
 import org.slf4j.Logger;
@@ -96,14 +99,61 @@ public static byte[] generateMasterKey(byte[] password) throws NoSuchAlgorithmEx
      * @param data
      * @return
      */
-    public ByteBufList computeDigestAndPackageForSending(long entryId, long lastAddConfirmed, long length,
-            ByteBuf data) {
-        ByteBuf headersBuffer;
+    public ReferenceCounted computeDigestAndPackageForSending(long entryId, long lastAddConfirmed, long length,
+                                                              ByteBuf data, byte[] masterKey, int flags) {
         if (this.useV2Protocol) {
-            headersBuffer = allocator.buffer(METADATA_LENGTH + macCodeLength);
+            return computeDigestAndPackageForSendingV2(entryId, lastAddConfirmed, length, data, masterKey, flags);
         } else {
-            headersBuffer = Unpooled.buffer(METADATA_LENGTH + macCodeLength);
+            return computeDigestAndPackageForSendingV3(entryId, lastAddConfirmed, length, data);
         }
+    }
+
+    private ReferenceCounted computeDigestAndPackageForSendingV2(long entryId, long lastAddConfirmed, long length,
+                                                            ByteBuf data, byte[] masterKey, int flags) {
+        boolean isSmallEntry = data.readableBytes() < BookieProtoEncoding.SMALL_ENTRY_SIZE_THRESHOLD;
+
+        int headersSize = 4 // Request header
+                        + BookieProtocol.MASTER_KEY_LENGTH // for the master key
+                        + METADATA_LENGTH  //
+                        + macCodeLength;
+        int payloadSize = data.readableBytes();
+        int bufferSize = 4 + headersSize + (isSmallEntry ? payloadSize : 0);
+
+        ByteBuf buf = allocator.buffer(bufferSize, bufferSize);
+        buf.writeInt(headersSize + payloadSize);
+        buf.writeInt(
+                BookieProtocol.PacketHeader.toInt(
+                        BookieProtocol.CURRENT_PROTOCOL_VERSION, BookieProtocol.ADDENTRY, (short) flags));
+        buf.writeBytes(masterKey, 0, BookieProtocol.MASTER_KEY_LENGTH);
+
+        // The checksum is computed on the next part of the buffer only
+        buf.readerIndex(buf.writerIndex());
+        buf.writeLong(ledgerId);
+        buf.writeLong(entryId);
+        buf.writeLong(lastAddConfirmed);
+        buf.writeLong(length);
+
+        // Compute checksum over the headers
+        update(buf);
+        update(data);
+
+        populateValueAndReset(buf);
+
+        // Reset the reader index to the beginning
+        buf.readerIndex(0);
+
+        if (isSmallEntry) {
+            buf.writeBytes(data);
+            data.release();
+            return buf;
+        } else {
+            return ByteBufList.get(buf, data);
+        }
+    }
+
+    private ByteBufList computeDigestAndPackageForSendingV3(long entryId, long lastAddConfirmed, long length,
+                                                            ByteBuf data) {
+        ByteBuf headersBuffer = Unpooled.buffer(METADATA_LENGTH + macCodeLength);
         headersBuffer.writeLong(ledgerId);
         headersBuffer.writeLong(entryId);
         headersBuffer.writeLong(lastAddConfirmed);

bookkeeper-server/src/test/java/org/apache/bookkeeper/client/ClientUtil.java

@@ -27,8 +27,8 @@
 import org.apache.bookkeeper.client.api.LedgerMetadata;
 import org.apache.bookkeeper.meta.LedgerManager;
 import org.apache.bookkeeper.proto.DataFormats.LedgerMetadataFormat.DigestType;
+import org.apache.bookkeeper.proto.MockBookieClient;
 import org.apache.bookkeeper.proto.checksum.DigestManager;
-import org.apache.bookkeeper.util.ByteBufList;
 import org.apache.bookkeeper.versioning.Versioned;
 
 /**
@@ -48,8 +48,8 @@ public static ByteBuf generatePacket(long ledgerId, long entryId, long lastAddCo
             int offset, int len) throws GeneralSecurityException {
         DigestManager dm = DigestManager.instantiate(ledgerId, new byte[2], DigestType.CRC32,
                 UnpooledByteBufAllocator.DEFAULT, true);
-        return ByteBufList.coalesce(dm.computeDigestAndPackageForSending(entryId, lastAddConfirmed, length,
-                Unpooled.wrappedBuffer(data, offset, len)));
+        return MockBookieClient.copyData(dm.computeDigestAndPackageForSending(entryId, lastAddConfirmed, length,
+                Unpooled.wrappedBuffer(data, offset, len), new byte[20], 0));
     }
 
     /**

bookkeeper-server/src/test/java/org/apache/bookkeeper/client/LedgerHandleAdapter.java

@@ -20,16 +20,17 @@
 package org.apache.bookkeeper.client;
 
 import io.netty.buffer.ByteBuf;
-import org.apache.bookkeeper.util.ByteBufList;
+import org.apache.bookkeeper.proto.MockBookieClient;
 
 /**
  * Adapter for tests to get the public access from LedgerHandle for its default
  * scope.
  */
 public class LedgerHandleAdapter {
 
-    public static ByteBufList toSend(LedgerHandle lh, long entryId, ByteBuf data) {
-        return lh.getDigestManager().computeDigestAndPackageForSending(entryId, lh.getLastAddConfirmed(),
-                lh.addToLength(data.readableBytes()), data);
+    public static ByteBuf toSend(LedgerHandle lh, long entryId, ByteBuf data) {
+        return MockBookieClient.copyData(lh.getDigestManager()
+                .computeDigestAndPackageForSending(entryId, lh.getLastAddConfirmed(),
+                        lh.addToLength(data.readableBytes()), data, new byte[20], 0));
     }
 }

bookkeeper-server/src/test/java/org/apache/bookkeeper/client/MockBookKeeperTestCase.java

@@ -35,6 +35,7 @@
 import io.netty.buffer.ByteBufAllocator;
 import io.netty.buffer.Unpooled;
 import io.netty.buffer.UnpooledByteBufAllocator;
+import io.netty.util.ReferenceCounted;
 import java.security.GeneralSecurityException;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -67,6 +68,7 @@
 import org.apache.bookkeeper.proto.BookieClient;
 import org.apache.bookkeeper.proto.BookieProtocol;
 import org.apache.bookkeeper.proto.BookkeeperInternalCallbacks;
+import org.apache.bookkeeper.proto.MockBookieClient;
 import org.apache.bookkeeper.proto.checksum.DigestManager;
 import org.apache.bookkeeper.stats.NullStatsLogger;
 import org.apache.bookkeeper.util.ByteBufList;
@@ -504,10 +506,10 @@ protected void setupBookieClientReadEntry() {
 
                 if (mockEntry != null) {
                     LOG.info("readEntry - found mock entry {}@{} at {}", entryId, ledgerId, bookieSocketAddress);
-                    ByteBufList entry = macManager.computeDigestAndPackageForSending(entryId,
+                    ReferenceCounted entry = macManager.computeDigestAndPackageForSending(entryId,
                         mockEntry.lastAddConfirmed, mockEntry.payload.length,
-                        Unpooled.wrappedBuffer(mockEntry.payload));
-                    callback.readEntryComplete(BKException.Code.OK, ledgerId, entryId, ByteBufList.coalesce(entry),
+                        Unpooled.wrappedBuffer(mockEntry.payload), new byte[20], 0);
+                    callback.readEntryComplete(BKException.Code.OK, ledgerId, entryId, MockBookieClient.copyData(entry),
                             args[4]);
                     entry.release();
                 } else {