[Bug][Service] All tasks that need to send attachment will fail due to chennel idle (#5442)

dolphinscheduler-remote/src/main/java/org/apache/dolphinscheduler/remote/handler/NettyClientHandler.java

@@ -184,9 +184,11 @@ public class NettyClientHandler extends ChannelInboundHandlerAdapter {
             Command heartBeat = new Command();
             heartBeat.setType(CommandType.HEART_BEAT);
             heartBeat.setBody(heartBeatData);
-            ctx.writeAndFlush(heartBeat)
+            ctx.channel().writeAndFlush(heartBeat)
                     .addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
-
+            if (logger.isDebugEnabled()) {
+                logger.debug("Client send heart beat to: {}", ChannelUtils.getRemoteAddress(ctx.channel()));
+            }
         } else {
             super.userEventTriggered(ctx, evt);
         }

dolphinscheduler-remote/src/main/java/org/apache/dolphinscheduler/remote/handler/NettyServerHandler.java

@@ -116,6 +116,12 @@ public class NettyServerHandler extends ChannelInboundHandlerAdapter {
      */
     private void processReceived(final Channel channel, final Command msg) {
         final CommandType commandType = msg.getType();
+        if (CommandType.HEART_BEAT.equals(commandType)) {
+            if (logger.isDebugEnabled()) {
+                logger.debug("server receive heart beat from: host: {}", ChannelUtils.getRemoteAddress(channel));
+            }
+            return;
+        }
         final Pair<NettyRequestProcessor, ExecutorService> pair = processors.get(commandType);
         if (pair != null) {
             Runnable r = () -> {