剥离文件并通过TCP同时将大块写入服务器显示断开的管道错误

我的客户端将文件分成多个块（每个块128mb），然后它将使用goroutines将这些块同时上传到多个服务器。

但是，当我使用多个goroutine时，我的客户端程序出现了错误。

write tcp [::1]:49324->[::1]:2001: write: broken pipe

在我的服务器上，错误是

EOF

请注意，管道断裂错误和EOF错误发生在不同的块中。例如，写入块1时可能发生管道破裂错误，而服务器接收块2时可能发生EOF错误。

下面是客户端代码：

//set maximum no. of goroutine running in the back
maxGoroutines := 3
guard := make(chan struct{}, maxGoroutines)

var sentByte int64

for i:= 0; i < chunkCount; i += 1{
    guard <- struct{}{} 

    go func(i int){
        index := i%len(serverList)
        vsConnection, _ := net.Dial("tcp", serverList[index])

        sentByte=0
        file, _ := os.Open(fileName)
        file.Seek(int64(i)*CHUNKSIZE,0) //CHUNKSIZE is 134217728
        for { 
            n, _ := file.Read(sendBuffer)

            n2, err2 := vsConnection.Write(sendBuffer[:n])
            if err2 != nil {
                fmt.Println("err2",err2,chunkName)              
            }
            if(n2!=65536){ //65536 is size of sendBuffer
                fmt.Println("n2",n2)
            }
            sentByte = sentByte+int64(n)
            if(sentByte == CHUNKSIZE){
                break;
            }
        }
        vsConnection.Close()
        file.Close()
        <-guard
    }(i)
}

下面是服务器代码：

func main() {
    mapping := cmap.New()
    server, error := net.Listen("tcp", ":2001")
    if error != nil {
        fmt.Println("There was an error starting the server" +    error.Error())
        return
    }

    for {
        connection, error := server.Accept()
        if error != nil {
            fmt.Println("There was am error with the connection" + error.Error())
            return
        }
        //one goroutine per connection
        go ConnectionHandler(connection,mapping)
    }
}

func ConnectionHandler(connection net.Conn, mapping cmap.ConcurrentMap) {
    fmt.Println("Connected")
    //make a buffer to hold data        
    var bufferFile bytes.Buffer
    writer := bufio.NewWriter(&bufferFile)

    var receivedBytes int64
    receivedBytes=0
    for {

        if(CHUNKSIZE<=receivedBytes){
            break
        }
        n,err := io.CopyN(writer, connection, BUFFERSIZE)
        receivedBytes += n
        if err != nil {
            fmt.Println("err", err.Error(), fileName)
            break
        }
    }
    mapping.Set(fileName,bufferFile.Bytes())
    connection.Close()

}

预先非常感谢。