Yiqun Lin

Hi @maobaolong , Before do the final merge, can we bring this design in ozone dev mailing list and let more people can look into this? I don't think other...

Okay, maybe I missed that.

首先谢谢关注本书的内容， 你上面提到的实际进入ClientNamenodeProtocolTranslatorPB的create不是DFSClient的create方法，不知道是不是和书籍版本分析Hadoop版本不同所致，书籍分析的是2.7版本的Hadoop代码。ClientNamenodeProtocolTranslatorPB是个client端的操作方法，这个方法远程会调用到NameNode server side端的方法，最终会进入到FSNamesystem#startFile-->FSDirWriteFileOp的startFile方法的，所以书籍阐述的是进入到FSDirWriteFileOp的startFile方法。

> @functioner would you mind to submit addendum blank commit to trigger CI again. Just notice that there are many failed unit tests but it seems not related to this...

这些类是我定义的一些插入数据库操作类，我没有上传，你可以直接删掉就可以了，不会影响程序本身。