So then the fuse driver is playing Schroedinger's cat with the file (sorry I couldn't resist)
On Fri, Oct 16, 2015, 11:16 AM David Lang <[email protected]> wrote: > On Fri, 16 Oct 2015, Kendall Green wrote: > > > The bug doesn't seem to be the file system driver, because the fuse-dfs > > mount reports the error as random write operation. The error message is > > from the driver library which validates sequential writes are used, but > is > > caused from rsyslog changing from sequential to random write operations. > > > > When rsyslog first writes file output is sequential, then at the point > when > > some other process writes to a different file, or simply ls the directory > > rsyslog is writing to, then rsyslog starts attempting unsupported write > > operations and process batch deletion as if write error retry was > > successful when it is not. > > Rsyslog doesn't know that any other program accessed the file, so it > doesn't > switch from one type of write to another. > > What I think is happening is that the fuse driver is getting confused. the > other > program that accesses the file is doing something that makes the fuse > driver > think that it may write to it or otherwise sets a pointer somewhere > internally. > Then when rsyslog does it's next write to the file (note that rsyslog has > kept > the file open all the time, and never issues a seek/lseek command, it's > just > writing to the next spot int he file) the fuse driver thinks that this is > now a > randmom write because it's gotten confused about where it should be in the > file. > > as Rainer says, an strace of rsyslog will show that it's writes are not any > different before or after the other program accessed the file, same flags, > etc. > > David Lang_______________________________________________ > rsyslog mailing list > http://lists.adiscon.net/mailman/listinfo/rsyslog > http://www.rsyslog.com/professional-services/ > What's up with rsyslog? Follow https://twitter.com/rgerhards > NOTE WELL: This is a PUBLIC mailing list, posts are ARCHIVED by a myriad > of sites beyond our control. PLEASE UNSUBSCRIBE and DO NOT POST if you > DON'T LIKE THAT. _______________________________________________ rsyslog mailing list http://lists.adiscon.net/mailman/listinfo/rsyslog http://www.rsyslog.com/professional-services/ What's up with rsyslog? Follow https://twitter.com/rgerhards NOTE WELL: This is a PUBLIC mailing list, posts are ARCHIVED by a myriad of sites beyond our control. PLEASE UNSUBSCRIBE and DO NOT POST if you DON'T LIKE THAT.
