Netty 客戶端接收消息延遲

Question

1.場景說明：設備發送數據到Netty Server（大約##20ms間隔##），Netty Server將msg轉發給客戶端##立即##（IOS或Android）。 2.關聯業務代碼ctx.writeAndFlush(msg)

protected void doWrite(ChannelOutboundBuffer in) throws Exception {
    int writeSpinCount = -1;

    boolean setOpWrite = false;
    for (;;) {
        //Get the data of the first node that needs to be flushed
        Object msg = in.current();

        if (msg instanceof ByteBuf) {
            
            ByteBuf buf = (ByteBuf) msg;

            boolean done = false;
            long flushedAmount = 0;
            // Get the number of spin lock iterations
            if (writeSpinCount == -1) {
                writeSpinCount = config().getWriteSpinCount();
            }
            // Spin, write out the current node
            for (int i = writeSpinCount - 1; i >= 0; i --) {
                int localFlushedAmount = doWriteBytes(buf);
                if (localFlushedAmount == 0) {
                    setOpWrite = true;
                    break;
                }

                flushedAmount += localFlushedAmount;
                if (!buf.isReadable()) {
                    done = true;
                    break;
                }
            }

            in.progress(flushedAmount);

            // After writing, delete the current node
            if (done) {
                in.remove();
            } else {
                break;
            }
        } 
    }
}

protected int doWriteBytes(ByteBuf buf) throws Exception {
    final int expectedWrittenBytes = buf.readableBytes();
    return buf.readBytes(javaChannel(), expectedWrittenBytes);
}

3.issue netty Server 可以及時接收設備數據，netty Server 也可以及時將數據寫入 Socket Buffer。 但是Netty客戶端收到消息延遲！！！（比如5s延遲）

4.服務器帶寬配置 Inbound 100M/bps bit per seconds。 每秒出站 5M/bps 比特。

Answer 1

客戶端長度加殼引起的問題。