On Sat, Jan 21, 2017 at 1:18 PM, Maged Mokhtar <mmokhtar@xxxxxxxxxxx> wrote:
> Hi,
>
> If a host with a kernel mapped rbd image dies, it still keeps a watch on
> the rbd image header for a timeout that seems to be determined by
> ms_tcp_read_timeout ( default 15 minutes ) rather than
> osd_client_watch_timeout whereas according to the docs: "If the client
> loses its connection to the primary OSD for a watched object, the watch
> will be removed after a timeout configured with osd_client_watch_timeout."
>
> It is possible to force watch removal by blacklisting the failed host, but
> i was wondering if the above timeout is the correct behavior. this is
> using latest 10.2.5
Yeah, it can do that in some cases because kernels up to 4.6 use the
old watch-notify protocol. If you upgrade the kernel client to 4.7 or
higher, all watches should get removed after osd_client_watch_timeout.
Thanks,
Ilya
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