I have narrowed down the source of the bug. Here is an strace of glusterfsd http://fpaste.org/131455/40996378/ The first line represents a write that does *not* make it into the underlying file. The last line is the write that stomps the earlier write. As I said, the client file is opened in O_APPEND mode, but on the glusterfsd side, the file is just O_CREAT|O_WRONLY. The means the offsets to pwrite() need to be valid. I correlated this to a tcpdump I took and I can see that in fact, the RPCs being sent have the wrong offset. Interestingly, glusterfs.write-is-append = 0, which I wouldn't have expected. I think the bug lies in the glusterfs fuse client. As to your question about Gluster 3.5.2, I may be able to do that if I am unable to find the bug in the source. -Mike On Sep 5, 2014, at 6:16 PM, Justin Clift <justin@xxxxxxxxxxx> wrote: > On 06/09/2014, at 12:10 AM, mike wrote: >> I have found that the O_APPEND flag is key to this failure - I had overlooked that flag when reading the strace and trying to cobble up a minimal reproduction. >> >> I now have a small pair of python scripts that can reliably reproduce this failure. > > > As a thought, is there a reasonable way you can test this on GlusterFS 3.5.2? > > There were some important bug fixes in 3.5.2 (from 3.5.1). > > Note I'm not saying yours is one of them, I'm just asking if it's > easy to test and find out. :) > > Regards and best wishes, > > Justin Clift > > -- > GlusterFS - http://www.gluster.org > > An open source, distributed file system scaling to several > petabytes, and handling thousands of clients. > > My personal twitter: twitter.com/realjustinclift > _______________________________________________ Gluster-users mailing list Gluster-users@xxxxxxxxxxx http://supercolony.gluster.org/mailman/listinfo/gluster-users
