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IGNITE-29006 Refactored TcpDiscoveryMessageSerializer to handle serialization only #13514

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IGNITE-29006 Refactored TcpDiscoveryMessageSerializer to handle serialization only #13514

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f7c011d
IGNITE-29006 Refactored TcpDiscoveryMessageSerializer to handle seria…
petrov-mg Aug 24, 2026
295f33f
IGNITE-29006 Fixed lost isEmpty check for client workers.
petrov-mg Sep 4, 2026
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122 changes: 55 additions & 67 deletions modules/core/src/main/java/org/apache/ignite/spi/discovery/tcp/ServerImpl.java
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Original file line number Diff line number Diff line change
Expand Up @@ -99,7 +99,6 @@
import org.apache.ignite.internal.util.typedef.C1;
import org.apache.ignite.internal.util.typedef.F;
import org.apache.ignite.internal.util.typedef.P1;
import org.apache.ignite.internal.util.typedef.T2;
import org.apache.ignite.internal.util.typedef.X;
import org.apache.ignite.internal.util.typedef.internal.LT;
import org.apache.ignite.internal.util.typedef.internal.S;
Expand All @@ -122,8 +121,10 @@
import org.apache.ignite.spi.discovery.DiscoverySpiCustomMessage;
import org.apache.ignite.spi.discovery.DiscoverySpiListener;
import org.apache.ignite.spi.discovery.IgniteDiscoveryThread;
import org.apache.ignite.spi.discovery.tcp.internal.ClientMessageHolder;
import org.apache.ignite.spi.discovery.tcp.internal.DiscoveryDataPacket;
import org.apache.ignite.spi.discovery.tcp.internal.FutureTask;
import org.apache.ignite.spi.discovery.tcp.internal.TcpDiscoveryMessageSerializer;
import org.apache.ignite.spi.discovery.tcp.internal.TcpDiscoveryNode;
import org.apache.ignite.spi.discovery.tcp.internal.TcpDiscoveryNodesRing;
import org.apache.ignite.spi.discovery.tcp.internal.TcpDiscoverySpiState;
Expand Down Expand Up @@ -2859,7 +2860,7 @@ protected class RingMessageWorker extends MessageWorker<TcpDiscoveryAbstractMess
// To address this, we use TcpDiscoveryMessageSerializer, which includes some code copied from TcpDiscoveryIoSession
// and can be instantiated independently of any active session.
/** */
private final TcpDiscoveryMessageSerializer clientMsgSer = new TcpDiscoveryMessageSerializer(ctx);
private final TcpDiscoveryMessageSerializer cliMsgSer = new TcpDiscoveryMessageSerializer(ctx);

/** IO session. */
private TcpDiscoveryIoSession ses;
Expand Down Expand Up @@ -3229,50 +3230,52 @@ private void processAuthFailedMessage(TcpDiscoveryAuthFailedMessage authFailedMs
* @param msg Message.
*/
private void sendMessageToClients(TcpDiscoveryAbstractMessage msg) {
if (redirectToClients(msg)) {
if (spi.ensured(msg))
msgHist.add(msg);
if (!redirectToClients(msg))
return;

if (clientMsgWorkers.isEmpty())
return;
if (spi.ensured(msg))
msgHist.add(msg);

if (clientMsgWorkers.isEmpty())
return;

byte[] msgBytes;
ClientMessageHolder sharedMsgHolder = new ClientMessageHolder(msg);

for (ClientMessageWorker worker : clientMsgWorkers.values()) {
TcpDiscoveryAbstractMessage rebuiltMsg = rebuildForClient(msg, worker.clientNodeId);

ClientMessageHolder msgToSend = rebuiltMsg == msg
? sharedMsgHolder
: new ClientMessageHolder(rebuiltMsg);

try {
msgBytes = clientMsgSer.serializeMessage(msg);
msgToSend.serialize(cliMsgSer);
}
catch (IgniteCheckedException | IOException e) {
U.error(log, "Failed to serialize message: " + msg, e);
catch (IgniteCheckedException e) {
U.error(log, "Failed to serialize message: " + msgToSend, e);

return;
}

for (ClientMessageWorker clientMsgWorker : clientMsgWorkers.values()) {
TcpDiscoveryAbstractMessage msg0 = msg;
byte[] msgBytes0 = msgBytes;
worker.addMessage(msgToSend);
}
}

if (msg instanceof TcpDiscoveryNodeAddedMessage) {
TcpDiscoveryNodeAddedMessage nodeAddedMsg = (TcpDiscoveryNodeAddedMessage)msg;
/** */
private TcpDiscoveryAbstractMessage rebuildForClient(TcpDiscoveryAbstractMessage msg, UUID clientNodeId) {
if (!(msg instanceof TcpDiscoveryNodeAddedMessage))
return msg;

if (clientMsgWorker.clientNodeId.equals(nodeAddedMsg.node().id())) {
msg0 = new TcpDiscoveryNodeAddedMessage(nodeAddedMsg);
TcpDiscoveryNodeAddedMessage nodeAddedMsg = (TcpDiscoveryNodeAddedMessage)msg;

prepareNodeAddedMessage(msg0, clientMsgWorker.clientNodeId, null);
if (!clientNodeId.equals(nodeAddedMsg.node().id()))
return msg;

try {
msgBytes0 = clientMsgSer.serializeMessage(msg0);
}
catch (IgniteCheckedException | IOException e) {
U.error(log, "Failed to serialize message: " + msg0, e);
TcpDiscoveryNodeAddedMessage res = new TcpDiscoveryNodeAddedMessage(nodeAddedMsg);

return;
}
}
}
prepareNodeAddedMessage(res, clientNodeId, null);

clientMsgWorker.addMessage(msg0, msgBytes0);
}
}
return res;
}

/**
Expand Down Expand Up @@ -7469,21 +7472,10 @@ private class StatisticsPrinter extends IgniteSpiThread {
}

/** */
private class ClientMessageWorker extends MessageWorker<T2<TcpDiscoveryAbstractMessage, byte[]>> {
private class ClientMessageWorker extends MessageWorker<ClientMessageHolder> {
/** Node ID. */
private final UUID clientNodeId;

// The code responsible for sending and receiving messages to and from client nodes represents a special case in ServerImpl,
// as it is split into two separate components.
// One part, ClientMessageWorker, handles only message sending to clients and does not process responses.
// The other part, which reads messages from clients, is implemented in SocketReader.
// Due to this separation, we don't require a full TcpDiscoveryIoSession here
// and can instead extract just the message-writing functionality.
// At the same time, we aim to keep both reading and writing logic encapsulated within TcpDiscoveryIoSession.
// As a result, we need to copy some code from TcpDiscoveryIoSession into the new class, TcpDiscoveryMessageSerializer.
/** */
private final TcpDiscoveryMessageSerializer clientMsgSer;

/** Session shared with the socket reader serving the same client connection. */
private final TcpDiscoveryIoSession ses;

Expand Down Expand Up @@ -7518,8 +7510,6 @@ private ClientMessageWorker(TcpDiscoveryIoSession ses, UUID clientNodeId, Ignite
this.ses = ses;
this.clientNodeId = clientNodeId;

clientMsgSer = new TcpDiscoveryMessageSerializer(ctx);

lastMetricsUpdateMsgTimeNanos = System.nanoTime();
}

Expand All @@ -7546,24 +7536,19 @@ void metrics(ClusterMetrics metrics) {
this.metrics = metrics;
}

/**
* @param msg Message.
*/
/** @param msg Discovery Message. */
void addMessage(TcpDiscoveryAbstractMessage msg) {
addMessage(msg, null);
addMessage(new ClientMessageHolder(msg));
}

/**
* @param msg Message.
* @param msgBytes Optional message bytes.
*/
void addMessage(TcpDiscoveryAbstractMessage msg, @Nullable byte[] msgBytes) {
T2<TcpDiscoveryAbstractMessage, byte[]> t = new T2<>(msg, msgBytes);
/** @param msgHolder Holder of a Discovery Message to send to the client. */
void addMessage(ClientMessageHolder msgHolder) {
TcpDiscoveryAbstractMessage msg = msgHolder.message();

if (msg.highPriority())
queue.addFirst(t);
queue.addFirst(msgHolder);
else
queue.add(t);
queue.add(msgHolder);

DebugLogger log = messageLogger(msg);

Expand All @@ -7572,10 +7557,10 @@ void addMessage(TcpDiscoveryAbstractMessage msg, @Nullable byte[] msgBytes) {
}

/** {@inheritDoc} */
@Override protected void processMessage(T2<TcpDiscoveryAbstractMessage, byte[]> msgT) {
@Override protected void processMessage(ClientMessageHolder msgHolder) {
boolean success = false;

TcpDiscoveryAbstractMessage msg = msgT.get1();
TcpDiscoveryAbstractMessage msg = msgHolder.message();

try {
assert msg.verified() : msg;
Expand All @@ -7601,8 +7586,9 @@ else if (msgLog.isDebugEnabled()) {
+ getLocalNodeId() + ", rmtNodeId=" + clientNodeId + ", msg=" + msg + ']');
}

writeToSocket(msgT, spi.failureDetectionTimeoutEnabled() ? spi.clientFailureDetectionTimeout() :
spi.getSocketTimeout());
long timeout = spi.failureDetectionTimeoutEnabled() ? spi.clientFailureDetectionTimeout() : spi.getSocketTimeout();

writeMessage(msgHolder, timeout);
}
}
else {
Expand All @@ -7613,7 +7599,7 @@ else if (msgLog.isDebugEnabled()) {

assert topologyInitialized(msg) : msg;

writeToSocket(msgT, spi.getEffectiveSocketTimeout(false));
writeMessage(msgHolder, spi.getEffectiveSocketTimeout(false));
}

boolean clientFailed = msg instanceof TcpDiscoveryNodeFailedMessage &&
Expand Down Expand Up @@ -7643,14 +7629,16 @@ else if (msgLog.isDebugEnabled()) {
}

/**
* @param msgT Message tuple.
* @param msgHolder Message holder.
* @param timeout Timeout.
*/
private void writeToSocket(T2<TcpDiscoveryAbstractMessage, byte[]> msgT, long timeout)
throws IgniteCheckedException, IOException {
byte[] msgBytes = msgT.get2() == null ? clientMsgSer.serializeMessage(msgT.get1()) : msgT.get2();
private void writeMessage(ClientMessageHolder msgHolder, long timeout) throws IgniteCheckedException, IOException {
byte[] msgBytes = msgHolder.messageBytes();

spi.write(ses, msgBytes, timeout);
if (msgBytes != null)
spi.write(ses, msgBytes, timeout);
else
spi.writeMessage(ses, msgHolder.message(), timeout);
}

/**
Expand Down
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