Hi!
open( ... O_APPEND) works fine in a single system. If many processes write to the same file, their output will never overwrite each other.
On NFS overwriting is possible, as appending is only emulated - each write is preceded by a seek to the current file size and race condition may occur.
How it is in cephfs?
I have a file F opened with O_APPEND|O_WRONLY by some process. In a console I type
$ echo "asd" >> F
Effectively, this is opening of file F by another process with O_APPEND flag .
The string "asd" is written to the beginning of file F, overwriting the starting bytes in the file. Is it a bug or a feature? If a feature, how it is described?
It is ceph Hammer and kernel 3.10.0-229.11.1.el7.x86_64
Thanks!
J.
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