not clearing heap memory - threads allocated and not releasing netty latest version

Expected behavior

Heap memory should clear after processing messages

Actual behavior

Keep piling up memory not releasing my threads still serving for network messages for checking connections.

Steps to reproduce

keep checking network connectivity and processing messages.

Minimal yet complete reproducer code (or URL to code)

server : ServerBootstrap bootstrap = new ServerBootstrap(); bootstrap.group(bossGroup, workerGroup) .channel(NioServerSocketChannel.class) .childHandler(new ChannelInitializer<SocketChannel>() { @Override public void initChannel(SocketChannel ch) throws Exception { ch.pipeline().addLast(“decoder”, new Decoder()) .addLast(“encoder”, new Encoder()) .addLast(group, new Handler());

                    }
                }).option(ChannelOption.SO_BACKLOG, 1024)
                .childOption(ChannelOption.TCP_NODELAY, true)
                .childOption(ChannelOption.SO_KEEPALIVE, true);

List<Integer> ports = Arrays.asList(8080,8081); channels = new ArrayList<>(ports.size()); for (int port : ports) { Channel serverChannel = bootstrap.bind(port).sync().channel(); channels.add(serverChannel); }

decoder : public class Decoder extends ByteToMessageDecoder {

@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf byteBuf, List<Object> out) throws Exception {

---- business logic to read – add object to out. out.add(msg); } } handler : public class Handler extends ChannelInboundHandlerAdapter {

@Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { –business logic– ctx.writeAndFlush(msg); } }

Encoder :

public class Encoder extends MessageToByteEncoder<Object> {

@Override protected void encode(ChannelHandlerContext ctx, Object msg, ByteBuf out) {

–business logic –

out.writeBytes(msg.getBytes());

} }

Netty version

4.1.45.Final

JVM version (e.g. java -version)

Adopt OpenJDK 11

OS version (e.g. uname -a)

Linux

[normanmaurer]

Also alternative you can configure the PooledByteBufAllocator to only pool direct memory

[normanmaurer]

I think you will need to share more code and also ensure there are no buffer leaks detected.