Messages in this thread | | | Subject | Re: [PATCH v3] NFSv4.1: new layout stateid can not be overwrite by one out of date | From | Trond Myklebust <> | Date | Mon, 17 Feb 2014 11:46:53 -0500 |
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On Feb 17, 2014, at 2:08, shaobingqing <shaobingqing@bwstor.com.cn> wrote:
> If initiate_file_draining returned NFS4ERR_DELAY, all the lsegs of > a file might be released before the retrying cb_layout request arriving > at the client. In this situation,the list lo->plh_segs is empty, > layoutget request of the file will use open stateid to obtain a new > layout stateid. And if the retrying cb_layout request arrived at the > client after the layoutget reply, new layout stateid would be overwrite > by one out of date.
I have very serious doubts about adding layout state to represent what the server is _trying_ to do. What if the server decides not to retry the recall? What if it reboots?
Let’s start with looking at the motivations: Have you ever run into the above problem in practice? If so, what was the effect on overall performance?
_________________________________ Trond Myklebust Linux NFS client maintainer, PrimaryData trond.myklebust@primarydata.com
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