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<p style="margin: 0px 0px 1.2em ! important;">Hi gluster-users!</p>
<p style="margin: 0px 0px 1.2em ! important;">I’ve got an issue
currently with my 2x brick replicate volume. The volume is fine,
and both bricks are replicating fine, but there is 1 file which
refuses to be deleted or moved (and now can’t be viewed via a
glusterfs mount) </p>
<p style="margin: 0px 0px 1.2em ! important;">We just upgraded
from <code style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">3.7.13-ubuntu1~trusty1</code>
to <code style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">3.7.16-ubuntu1~trusty1</code>,
whether this has anything to do with it, I am not sure. </p>
<p style="margin: 0px 0px 1.2em ! important;">The following tests
have been performed on the mount points.</p>
<ul style="margin: 1.2em 0px;padding-left: 2em;">
<li style="margin: 0.5em 0px;">Doing a stat on the file works</li>
<li style="margin: 0.5em 0px;">Moving(renaming) the folder above
works </li>
<li style="margin: 0.5em 0px;">Opening the file <code style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">vi file</code>
and doing a <code style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">cat file</code>
use to work before I did:
<ul style="margin: 1.2em 0px;padding-left: 2em;margin: 0px;
padding-left: 1em;">
<li style="margin: 0.5em 0px;"><code style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">mv /var/www/site/file /home/ubuntu/file</code></li>
</ul>
</li>
</ul>
<p style="margin: 0px 0px 1.2em ! important;">This mv command
never completed and I had to kill -9 it after an hour waiting.</p>
<p style="margin: 0px 0px 1.2em ! important;">It seems whenever
the file is opened now, it results in the process halting on a
stat command. The following is a stack trace when trying to run
the code (which calls the file, its php)</p>
<pre style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block ! important;"><snip>
16:17:34.358528 lstat("/var/www/site.com/wordpress/wp-content/plugins/gravityforms/includes/fields/class-gf-field-captcha.php", {st_mode=S_IFREG|0664, st_size=11878, ...}) = 0
16:17:34.358613 lstat("/var/www/site.com/wordpress/wp-content/plugins/gravityforms/includes/fields", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
16:17:34.358699 lstat("/var/www/site.com/wordpress/wp-content/plugins/gravityforms/includes", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
16:17:34.358810 lstat("/var/www/site.com/wordpress/wp-content/plugins/gravityforms/includes/fields/class-gf-field-captcha.php", {st_mode=S_IFREG|0664, st_size=11878, ...}) = 0
16:17:34.358870 lstat("/var/www/site.com/wordpress/wp-content/plugins/gravityforms/includes/fields", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
16:17:34.358966 lstat("/var/www/site.com/wordpress/wp-content/plugins/gravityforms/includes", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
16:17:34.359046 open("/var/www/site.com/wordpress/wp-content/plugins/gravityforms/includes/fields/class-gf-field-captcha.php", O_RDONLY) = 5
16:17:34.362692 fstat(5, {st_mode=S_IFREG|0664, st_size=11878, ...}) = 0
16:17:34.362769 fstat(5, {st_mode=S_IFREG|0664, st_size=11878, ...}) = 0
16:17:34.362848 fstat(5, {st_mode=S_IFREG|0664, st_size=11878, ...}) = 0
16:17:34.362910 fstat(5, {st_mode=S_IFREG|0664, st_size=11878, ...}) = 0
16:17:34.363008 mmap(NULL, 11878, PROT_READ, MAP_SHARED, 5, 0) = 0x7eff135fd000
16:17:34.363102 stat("/var/www/site.com/wordpress/wp-content/plugins/gravityforms/includes/fields/class-gf-field-captcha.php", {st_mode=S_IFREG|0664, st_size=11878, ...}) = 0
</code></pre>
<p style="margin: 0px 0px 1.2em ! important;">This is where the
stack trace fails everytime. </p>
<hr>
<p style="margin: 0px 0px 1.2em ! important;">sudo gluster volume
heal gv-www info<br>
Brick demo-gluster01:/gluster<br>
Status: Connected<br>
Number of entries: 0</p>
<p style="margin: 0px 0px 1.2em ! important;">Brick
demo-gluster02:/gluster<br>
Status: Connected<br>
Number of entries: 0</p>
<hr>
<p style="margin: 0px 0px 1.2em ! important;">sudo gluster volume
info</p>
<p style="margin: 0px 0px 1.2em ! important;">Volume Name: gv-www<br>
Type: Replicate<br>
Volume ID: 6163f185-d58b-45f2-8bf0-eeb3a18142d9<br>
Status: Started<br>
Number of Bricks: 1 x 2 = 2<br>
Transport-type: tcp<br>
Bricks:<br>
Brick1: demo-gluster01:/gluster<br>
Brick2: demo-gluster02:/gluster<br>
Options Reconfigured:<br>
cluster.self-heal-daemon: enable<br>
features.scrub: Active<br>
features.bitrot: on<br>
diagnostics.client-log-level: INFO<br>
diagnostics.brick-log-level: DEBUG<br>
performance.readdir-ahead: on</p>
<hr>
<p style="margin: 0px 0px 1.2em ! important;">I just enabled
bitrot and scrubbing. (To help with these possible issues)</p>
<p style="margin: 0px 0px 1.2em ! important;">The only real error
I can see in this timeframe is the following:</p>
<p style="margin: 0px 0px 1.2em ! important;">Brick1:</p>
<pre style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block ! important;">/var/log/glusterfs/var-www.log.1:[2016-10-17 23:29:12.160099] W [MSGID: 108008] [afr-read-txn.c:244:afr_read_txn] 0-gv-www-replicate-0: Unreadable subvolume -1 found with event generation 2 for gfid 2ce27b6e-99aa-408b-b386-b70d3e09d228. (Possible split-brain)
/var/log/glusterfs/var-www.log.1:[2016-10-17 23:29:12.174907] W [MSGID: 108008] [afr-read-txn.c:244:afr_read_txn] 0-gv-www-replicate-0: Unreadable subvolume -1 found with event generation 2 for gfid 2ce27b6e-99aa-408b-b386-b70d3e09d228. (Possible split-brain)
/var/log/glusterfs/var-www.log.1:[2016-10-17 23:29:12.176708] W [MSGID: 108008] [afr-read-txn.c:244:afr_read_txn] 0-gv-www-replicate-0: Unreadable subvolume -1 found with event generation 2 for gfid 2ce27b6e-99aa-408b-b386-b70d3e09d228. (Possible split-brain)
/var/log/glusterfs/var-www.log.1:[2016-10-17 23:29:12.178831] W [MSGID: 108008] [afr-read-txn.c:244:afr_read_txn] 0-gv-www-replicate-0: Unreadable subvolume -1 found with event generation 2 for gfid 2ce27b6e-99aa-408b-b386-b70d3e09d228. (Possible split-brain)
/var/log/glusterfs/var-www.log.1:[2016-10-17 23:29:12.181356] W [MSGID: 108008] [afr-read-txn.c:244:afr_read_txn] 0-gv-www-replicate-0: Unreadable subvolume -1 found with event generation 2 for gfid 2ce27b6e-99aa-408b-b386-b70d3e09d228. (Possible split-brain)
/var/log/glusterfs/var-www.log.1:[2016-10-17 23:29:12.183602] W [MSGID: 108008] [afr-read-txn.c:244:afr_read_txn] 0-gv-www-replicate-0: Unreadable subvolume -1 found with event generation 2 for gfid 2ce27b6e-99aa-408b-b386-b70d3e09d228. (Possible split-brain)
/var/log/glusterfs/var-www.log.1:[2016-10-17 23:29:12.186835] W [MSGID: 108008] [afr-read-txn.c:244:afr_read_txn] 0-gv-www-replicate-0: Unreadable subvolume -1 found with event generation 2 for gfid 2ce27b6e-99aa-408b-b386-b70d3e09d228. (Possible split-brain)
/var/log/glusterfs/var-www.log.1:[2016-10-17 23:29:12.189262] W [MSGID: 108008] [afr-read-txn.c:244:afr_read_txn] 0-gv-www-replicate-0: Unreadable subvolume -1 found with event generation 2 for gfid 2ce27b6e-99aa-408b-b386-b70d3e09d228. (Possible split-brain)
/var/log/glusterfs/var-www.log.1:[2016-10-17 23:29:12.191969] W [MSGID: 108008] [afr-read-txn.c:244:afr_read_txn] 0-gv-www-replicate-0: Unreadable subvolume -1 found with event generation 2 for gfid 2ce27b6e-99aa-408b-b386-b70d3e09d228. (Possible split-brain)
</code></pre>
<p style="margin: 0px 0px 1.2em ! important;">Brick2:</p>
<pre style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block ! important;">/var/log/glusterfs/var-www.log.1:[2016-10-15 00:16:48.163353] W [MSGID: 108008] [afr-read-txn.c:244:afr_read_txn] 0-gv-www-replicate-0: Unreadable subvolume -1 found with event generation 2 for gfid 6b0b2d6a-f6ea-4ab8-89fc-d776afc17c35. (Possible split-brain)
</code></pre>
<p style="margin: 0px 0px 1.2em ! important;">But I cannot find
any log relating to this on the gluster servers. </p>
<p style="margin: 0px 0px 1.2em ! important;">Also I can cat the
file no problem if I login to the bricks. What could be a reason
of it not working on the mount point…</p>
<p style="margin: 0px 0px 1.2em ! important;">Any help would be
greatly appreciated.</p>
<p style="margin: 0px 0px 1.2em ! important;">Cheers, Tim</p>
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