Hi team,
I hate "me too" emails sometimes not at all constructive, but I feel I
really ought chip in from real world systems we use in anger and at
massive scale here.
So we also use NFS to "mask" this and other performance issues. The
cluster.readdir-optimize gave us similar results unfortunately.
We reported our other challenge back last summer but we stalled on this:
http://www.gluster.org/pipermail/gluster-users/2013-June/036252.html
We also unfortunately now see a new NFS phenotype that I've pasted
below which is again is causing real heartburn.
Small files, always difficult for any FS, might be worth doing some
regression testing with small file directory scenarios in test - it's
an easy reproducer on even moderately sized gluster clusters. Hope
some good progress can be
made, and I understand it's a tough one to
track down performance hangs and issues. I just wanted to say that we
really do see them, and have tried many things to avoid them.
Here's the note from my team:
We were hitting 30 minute timeouts on getxattr/system.posix_acl_access
calls on directories in a NFS v3 mount (w/ acl option) of a 10-node
40-brick gluster 3.4.0 volume. Strace shows where the client hangs:
$ strace -tt -T getfacl d6h_take1
...
18:43:57.929225 lstat("d6h_take1", {st_mode=S_IFDIR|0755,
st_size=7024, ...}) = 0 <0.257107>
18:43:58.186461 getxattr("d6h_take1", "system.posix_acl_access",
0x7fffdf2b9f50, 132) = -1 ENODATA (No data available) <1806.296893>
19:14:04.483556 stat("d6h_take1", {st_mode=S_IFDIR|0755, st_size=7024,
...}) = 0 <0.642362>
19:14:05.126025 getxattr("d6h_take1", "system.posix_acl_default",
0x7fffdf2b9f50, 132) = -1 ENODATA (No data
available) <0.000024>
19:14:05.126114 stat("d6h_take1", {st_mode=S_IFDIR|0755, st_size=7024,
...}) = 0 <0.000010>
...
Load on the servers was moderate. While the above was hanging,
getfacl worked nearly instantaneously on that directory on all bricks.
When it finally hit the 30 minute timeout, gluster logged it in
nfs.log:
[2014-03-31 23:14:04.481154] E [rpc-clnt.c:207:call_bail]
0-holyscratch-client-36: bailing out frame type(GlusterFS 3.3)
op(GETXATTR(18)) xid = 0x8168809x sent = 2014-03-31 22:43:58.442411.
timeout = 1800
[2014-03-31 23:14:04.481233] W
[client-rpc-fops.c:1112:client3_3_getxattr_cbk]
0-holyscratch-client-36: remote operation failed: Transport endpoint
is not connected. Path: <gfid:b116fb01-b13d-448a-90d0-a8693a98698b>
(b116fb01-b13d-448a-90d0-a8693a98698b). Key: (null)
Other than that, we didn't see anything directly related in the nfs or
brick logs or anything out of sorts with the gluster services. A
couple other errors raise eyebrows, but these are different
directories (neighbors of the example above) and at different times:
holyscratch07: /var/log/glusterfs/nfs.log:[2014-03-31 19:30:47.794454]
I [dht-layout.c:630:dht_layout_normalize] 0-holyscratch-dht: found
anomalies in /ramanathan_lab/dhuh/d9_take2_BGI/Diffreg. holes=1
overlaps=0
holyscratch07: /var/log/glusterfs/nfs.log:[2014-03-31 19:31:47.794447]
I [dht-layout.c:630:dht_layout_normalize] 0-holyscratch-dht: found
anomalies in /ramanathan_lab/dhuh/d9_take2_BGI/Diffreg. holes=1
overlaps=0
holyscratch07: /var/log/glusterfs/nfs.log:[2014-03-31 19:33:47.802135]
I [dht-layout.c:630:dht_layout_normalize] 0-holyscratch-dht: found
anomalies in /ramanathan_lab/dhuh/d9_take2_BGI/Diffreg. holes=1
overlaps=0
holyscratch07: /var/log/glusterfs/nfs.log:[2014-03-31 19:34:47.802182]
I
[dht-layout.c:630:dht_layout_normalize] 0-holyscratch-dht: found
anomalies in /ramanathan_lab/dhuh/d9_take2_BGI/Diffreg. holes=1
overlaps=0
holyscratch07: /var/log/glusterfs/nfs.log:[2014-03-31 19:36:47.764329]
I [dht-layout.c:630:dht_layout_normalize] 0-holyscratch-dht: found
anomalies in /ramanathan_lab/dhuh/d9_take2_BGI/Diffreg. holes=1
overlaps=0
holyscratch07: /var/log/glusterfs/nfs.log:[2014-03-31 19:37:47.773164]
I [dht-layout.c:630:dht_layout_normalize] 0-holyscratch-dht: found
anomalies in /ramanathan_lab/dhuh/d9_take2_BGI/Diffreg. holes=1
overlaps=0
holyscratch07: /var/log/glusterfs/nfs.log:[2014-03-31 19:39:47.774285]
I [dht-layout.c:630:dht_layout_normalize] 0-holyscratch-dht: found
anomalies in /ramanathan_lab/dhuh/d9_take2_BGI/Diffreg. holes=1
overlaps=0
holyscratch07: /var/log/glusterfs/nfs.log:[2014-03-31 19:40:47.780338]
I [dht-layout.c:630:dht_layout_normalize] 0-holyscratch-dht:
found
anomalies in /ramanathan_lab/dhuh/d9_take2_BGI/Diffreg. holes=1
overlaps=0
holyscratch07: /var/log/glusterfs/nfs.log:[2014-03-31 19:42:47.730345]
I [dht-layout.c:630:dht_layout_normalize] 0-holyscratch-dht: found
anomalies in /ramanathan_lab/dhuh/d9_take2_BGI/Diffreg. holes=1
overlaps=0
holyscratch08:
/var/log/glusterfs/bricks/holyscratch08_03-brick.log:[2014-03-31
00:57:51.973565] E [posix-helpers.c:696:posix_handle_pair]
0-holyscratch-posix:
/holyscratch08_03/brick/ramanathan_lab/dhuh/d9_take2_BGI/cuffdiffRN.txt:
key:system.posix_acl_access error:Invalid argument
holyscratch08:
/var/log/glusterfs/bricks/holyscratch08_03-brick.log:[2014-03-31
01:18:12.345818] E [posix-helpers.c:696:posix_handle_pair]
0-holyscratch-posix:
/holyscratch08_03/brick/ramanathan_lab/dhuh/d9_take2_BGI/cuffdiffRN.txt:
key:system.posix_acl_access error:Invalid argument
holyscratch05:
/var/log/glusterfs/bricks/holyscratch05_04-brick.log:[2014-03-31
21:16:37.057674] E [posix-helpers.c:696:posix_handle_pair]
0-holyscratch-posix:
/holyscratch05_04/brick/ramanathan_lab/dhuh/d9_take2_BGI/Diffreg/cuffdiffRN.txt:
key:system.posix_acl_access error:Invalid argument
--
dr. james cuff, assistant dean for research computing, harvard
university | division of science | thirty eight oxford street,
cambridge. ma. 02138 | +1 617 384 7647 | http://rc.fas.harvard.edu
On Wed, Apr 9, 2014 at 9:52 AM, <james.bellin...@icecube.wisc.edu> wrote:
I am seeing something perhaps similar. 3.4.2-1, 2 servers, each with 1
brick, replicated. A du of a local (ZFS) directory tree of 297834 files
and 525GB takes about 17 minutes. A du of the gluster copy
is still not
finished after 22 hours. Network activity has been about 5-6KB/sec
until
(I gather) du hit a directory with 22450 files, when activity jumped to
300KB/sec (200 packets/sec) for about 15-20 minutes. If I assume that
the
spike came from scanning the two largest directories, that looks like
about 8K of traffic per file, and about 5 packets.
A 3.3.2 gluster installation that we are trying to retire is not
afflicted
this way.
James Bellinger
Am I the only person using Gluster suffering from very slow directory
access? It's so seriously bad that it almost makes Gluster unusable.
Using NFS instead of the Fuse client masks the problem as long as the
directories are cached but it's still hellishly slow when you first
access them.
Has there
been any progress at all fixing this bug?
https://bugzilla.redhat.com/show_bug.cgi?id=1067256
Cheers,
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