francisoliverlee commented on issue #5568:
URL: https://github.com/apache/rocketmq/issues/5568#issuecomment-1328207721
在4.9.X的版本上我统计过， 修改点非常多，如下，目前可以改一版临时用127对于多业务拼接topic名字来说， 确实太短
```
1. private PutMessageStatus checkMessage(MessageExtBrokerInner msg)
2. private PutMessageStatus checkMessages(MessageExtBatch messageExtBatch)
3. protected RemotingCommand msgContentCheck(final ChannelHandlerContext ctx,
final SendMessageRequestHeader requestHeader, RemotingCommand
request,
4. CompletableFuture<RemotingCommand>
asyncSendBatchMessage(ChannelHandlerContext ctx, RemotingCommand
5. PutMessageResult encode(MessageExtBrokerInner msgInner) {
6. public static MessageExt decode()
7. ByteBuffer encode(final MessageExtBatch messageExtBatch,
PutMessageContext putMessageContext)
8. public static Map<String, String> decodeProperties(ByteBuffer byteBuffer)
9. protected static int calMsgLength(int sysFlag, int bodyLength, int
topicLength, int propertiesLength)
10. EncodeResult serialize(final MessageExtBrokerInner msgInner)
11. Validators.TOPIC_MAX_LENGTH
12. TopicValidator.TOPIC_MAX_LENGTH
```
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