dubbo-remoting/dubbo-remoting-netty/src/main/java/org/apache/dubbo/remoting/transport/netty/NettyChannel.java [115:189]:
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            throw new RemotingException(
                    this,
                    "Failed to send message " + PayloadDropper.getRequestWithoutData(message) + " to "
                            + getRemoteAddress() + ", cause: " + e.getMessage(),
                    e);
        }

        if (!success) {
            throw new RemotingException(
                    this,
                    "Failed to send message " + PayloadDropper.getRequestWithoutData(message) + " to "
                            + getRemoteAddress() + "in timeout(" + timeout + "ms) limit");
        }
    }

    @Override
    public void close() {
        try {
            super.close();
        } catch (Exception e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
        try {
            removeChannelIfDisconnected(channel);
        } catch (Exception e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
        try {
            attributes.clear();
        } catch (Exception e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
        try {
            if (logger.isInfoEnabled()) {
                logger.info("Close netty channel " + channel);
            }
            channel.close();
        } catch (Exception e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
    }

    @Override
    public boolean hasAttribute(String key) {
        return attributes.containsKey(key);
    }

    @Override
    public Object getAttribute(String key) {
        return attributes.get(key);
    }

    @Override
    public void setAttribute(String key, Object value) {
        if (value == null) { // The null value unallowed in the ConcurrentHashMap.
            attributes.remove(key);
        } else {
            attributes.put(key, value);
        }
    }

    @Override
    public void removeAttribute(String key) {
        attributes.remove(key);
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((channel == null) ? 0 : channel.hashCode());
        return result;
    }

    @Override
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dubbo-remoting/dubbo-remoting-netty4/src/main/java/org/apache/dubbo/remoting/transport/netty4/NettyChannel.java [239:313]:
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            throw new RemotingException(
                    this,
                    "Failed to send message " + PayloadDropper.getRequestWithoutData(message) + " to "
                            + getRemoteAddress() + ", cause: " + e.getMessage(),
                    e);
        }
        if (!success) {
            throw new RemotingException(
                    this,
                    "Failed to send message " + PayloadDropper.getRequestWithoutData(message) + " to "
                            + getRemoteAddress() + "in timeout(" + timeout + "ms) limit");
        }
    }

    @Override
    public void close() {
        try {
            super.close();
        } catch (Exception e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
        try {
            removeChannelIfDisconnected(channel);
        } catch (Exception e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
        try {
            attributes.clear();
        } catch (Exception e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
        try {
            if (logger.isInfoEnabled()) {
                logger.info("Close netty channel " + channel);
            }
            channel.close();
        } catch (Exception e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
    }

    @Override
    public boolean hasAttribute(String key) {
        return attributes.containsKey(key);
    }

    @Override
    public Object getAttribute(String key) {
        return attributes.get(key);
    }

    @Override
    public void setAttribute(String key, Object value) {
        // The null value is not allowed in the ConcurrentHashMap.
        if (value == null) {
            attributes.remove(key);
        } else {
            attributes.put(key, value);
        }
    }

    @Override
    public void removeAttribute(String key) {
        attributes.remove(key);
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((channel == null) ? 0 : channel.hashCode());
        return result;
    }

    @Override
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