Thanks again, Ravi! These links are helpful, a good root for me to trace this topic, maybe I can find more useful info, thanks!
在 01/08/2017 04:09, Ravi Prakash 写道: Hi Hongxu! It might be best to go through JIRA comments. Some of them have design docs too. e.g. https://issues.apache.org/jira/browse/HDFS-265 , https://issues.apache.org/jira/browse/HDFS-744 etc. I know there may be some windy conversations, but the good thing about open-source is that all these deliberations are for everyone to see. HTH Ravi. On Mon, Jul 31, 2017 at 3:13 AM, Hongxu Ma <inte...@outlook.com<mailto:inte...@outlook.com>> wrote: Hi Dev In short, is there a full introduction to hdfs consistency model? I have already read some miscellaneous stuffs, e.g. - some simple scenario - read+read, ok - write+write, forbidden (guaranteed be lease) - design doc of append, truncate - hflush/hsync - top pages of google "hdfs consistency model" But I didn't find a detailed doc/link to clarify this topic, especially how to deal with concurrent read+write, e.g.: Can a later reader can read the contents which the writer (doesn't close the file yet) appended? Is hflush/hsync the only ways to ensure the consistency? etc.. I known the GFS paper has a specific section to clarify this topic, so I think hdfs may has a similar one. Very thanks for helpful link. -- Regards, Hongxu. -- Regards, Hongxu.
