[Gluster-devel] AFR: machine crash hangs other mountsortransportendpoint not connected
Christopher Hawkins
chawkins at veracitynetworks.com
Wed Apr 30 13:35:08 UTC 2008
Gluster devs,
I am still not able to keep the client from hanging in a diskless cluster
node. When I fail a server the client becomes unresponsive and does not read
from the other AFR volume. I first moved the entire /lib and /bin and /sbin
directories into the ramdisk which runs the nodes to rule out the simple
loss of an odd binary or library... An lsof | grep gluster on the client
(pre-failover test) shows:
[root at node1 ~]# lsof |grep gluster
glusterfs 2195 root cwd DIR 0,1 0 2 /
glusterfs 2195 root rtd DIR 0,1 0 2 /
glusterfs 2195 root txt REG 0,1 55592 3863
/bin/glusterfs
glusterfs 2195 root mem REG 0,1 341068 2392
/lib/libfuse.so.2.7.2
glusterfs 2195 root mem REG 0,1 118096 2505
/lib/glusterfs/1.3.8pre6/xlator/mount/fuse.so
glusterfs 2195 root mem REG 0,1 164703 2514
/lib/glusterfs/1.3.8pre6/xlator/protocol/client.so
glusterfs 2195 root mem REG 0,1 112168 77
/lib/ld-2.3.4.so
glusterfs 2195 root mem REG 0,1 1529120 2483
/lib/tls/libc-2.3.4.so
glusterfs 2195 root mem REG 0,1 16732 70
/lib/libdl-2.3.4.so
glusterfs 2195 root mem REG 0,1 107800 2485
/lib/tls/libpthread-2.3.4.so
glusterfs 2195 root mem REG 0,1 43645 2533
/lib/glusterfs/1.3.8pre6/transport/tcp/client.so
glusterfs 2195 root mem REG 0,1 427763 2456
/lib/libglusterfs.so.0.0.0
glusterfs 2195 root mem REG 0,1 50672 2474
/lib/tls/librt-2.3.4.so
glusterfs 2195 root mem REG 0,1 245686 2522
/lib/glusterfs/1.3.8pre6/xlator/cluster/afr.so
glusterfs 2195 root 0u CHR 1,3 3393 /dev/null
glusterfs 2195 root 1u CHR 1,3 3393 /dev/null
glusterfs 2195 root 2u CHR 1,3 3393 /dev/null
glusterfs 2195 root 3w REG 0,1 102 4495
/var/log/glusterfs/glusterfs.log
glusterfs 2195 root 4u CHR 10,229 3494 /dev/fuse
glusterfs 2195 root 5r 0000 0,8 0 4498 eventpoll
glusterfs 2195 root 6u IPv4 4499 TCP
192.168.20.155:1023->master1:6996 (ESTABLISHED)
glusterfs 2195 root 7u IPv4 4500 TCP
192.168.20.155:1022->master2:6996 (ESTABLISHED)
Everything listed here is a local file and the gluster binary has access to
them during failover. Can you help me troubleshoot by explaining what
exactly gluster is doing when it loses a connection? Does it depend on
something I have missed? This failover test uses the same config files and
binaries that my earlier tests use (which succeeded, but were not run on a
diskless node). There must be something else in the filesystem that
glusterfs requires to failover successfully?
Thanks,
Chris
> > >
> > >
> > > > Gerry, Christopher,
> > > >
> > > > Here is what I tried to do. Two servers, one client, simple
> > > setup, afr
> > > > on the client side. I did "ls" on client mount point, it
> > > works, now I
> > > > do "ifconfig eth0 down"
> > > > on the server, next I do "ls" on client, it hangs for 10
> > > secs (timeout
> > > > value) and fails over and starts working again without
> > any problem.
> > > >
> > > > I guess few users are facing the problem you guys are facing.
> > > > Can you give us your setup details and mention the
> exact steps to
> > > > reproduce. Also try to come up with minimal config details
> > > which can
> > > > still reproduce the problem
> > > >
> > > > Thanks!
> > > > Krishna
> > > >
> > > > On Sat, Apr 26, 2008 at 7:01 AM, Christopher Hawkins
> > > > <chawkins at veracitynetworks.com> wrote:
> > > > > I am having the same issue. I'm working on a diskless
> > > node cluster
> > > > > and figured the issue was related to that since AFR
> > > seems to fail
> > > > > over nicely for everyone else...
> > > > > But it seems I am not alone, so what can I do to help
> > > troubleshoot?
> > > > >
> > > > > I have two servers exporting a brick each, and a
> > client mounting
> > > > > them both with AFR and no unify. Transport timeout
> > > settings don't
> > > > > seem to make a difference - client is just hung if I
> > > power off or
> > > > > just stop glusterfsd. There is nothing logged on the
> > server side.
> > > > > I'll use a usb thumb drive for client side logging since
> > > > any logs in
> > > > > the ramdisk obviously disappear after the reboot which
> > > > fixes the hang...
> > > > > If I get any insight from this I'll report it asap.
> > > > >
> > > > > Thanks,
> > > > > Chris
> > > > >
> > > > >
> > > > >
> > >
> > >
> > >
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> > >
> >
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