Bug 1259312

Summary: Data Tiering:File create and new writes to existing file fails when the hot tier is full instead of redirecting/flushing the data to cold tier
Product: [Community] GlusterFS Reporter: Nag Pavan Chilakam <nchilaka>
Component: tieringAssignee: Nithya Balachandran <nbalacha>
Status: CLOSED EOL QA Contact: bugs <bugs>
Severity: high Docs Contact:
Priority: medium    
Version: 3.7.5CC: bugs, dlambrig, jbyers, sankarshan, vnosov
Target Milestone: ---Keywords: Reopened
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 1277112 (view as bug list) Environment:
Last Closed: 2017-03-08 10:47:55 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1277112    
Attachments:
Description Flags
qe cli log during bug raising none

Description Nag Pavan Chilakam 2015-09-02 11:58:47 UTC 
Description of problem:
======================
given that the hot tier is mostly a costly storage space, it is highly possible for the hot tier to have very less disk size compared to the cold tier.
So, in this problem, while I a, doing writes to a file and if the hot tier is full, the new writes fail. Also, Iam able to create any more new files even though the cold tier is largely free



Version-Release number of selected component (if applicable):
=========================================================
[root@nag-manual-node1 brick999]# gluster --version
glusterfs 3.7.3 built on Aug 27 2015 01:23:05
Repository revision: git://git.gluster.com/glusterfs.git
Copyright (c) 2006-2011 Gluster Inc. <http://www.gluster.com>
GlusterFS comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of GlusterFS under the terms of the GNU General Public License.
[root@nag-manual-node1 brick999]# rpm -qa|grep gluster
glusterfs-libs-3.7.3-0.82.git6c4096f.el6.x86_64
glusterfs-fuse-3.7.3-0.82.git6c4096f.el6.x86_64
glusterfs-server-3.7.3-0.82.git6c4096f.el6.x86_64
glusterfs-3.7.3-0.82.git6c4096f.el6.x86_64
glusterfs-api-3.7.3-0.82.git6c4096f.el6.x86_64
glusterfs-cli-3.7.3-0.82.git6c4096f.el6.x86_64
python-gluster-3.7.3-0.82.git6c4096f.el6.noarch
glusterfs-client-xlators-3.7.3-0.82.git6c4096f.el6.x86_64
[root@nag-manual-node1 brick999]# 


How reproducible:
=====================
easily

Steps to Reproduce:
====================
1.have a cold tier with huge space and hot tier with say about only 1GB space
2.Now turn on ctr and set the demote freq to say a large value like 3600(1hr)
3.Now fill the volume with about 990MB space(which will go to hot tier)
4. Now create a file (may be using dd command) which is about 100Mb
5. Now while creating , the file fails to acccomodate any more writes after 10MB as hot tier is full
6. Also try to create new files(to see if new files go to cold tier, as hot si filled)


Actual results:
===============
Exisin file writes and new file creates fail when hot tier is full, even though cold  tier is largely free.

Expected results:
=================
Make new writes /file creates to go to cold tier when hot tier is full or flush the relatively cold files in hot tier to accomodate new files, irrespective of demote freq.

Additional info:


Work-Around:
==========
Wait for the next CTR promote/demote cycle to kick in




CLI Log:
==========
[root@nag-manual-nfsclient1 srt]# dd if=/dev/urandom of=junkrandom.120m bs=1024 count=120000
120000+0 records in
120000+0 records out
122880000 bytes (123 MB) copied, 30.1008 s, 4.1 MB/s
[root@nag-manual-nfsclient1 srt]# ll
total 1320000
-rw-r--r--. 1 root root 1228800000 Sep  2 22:10 junkrandom
-rw-r--r--. 1 root root  122880000 Sep  2 22:13 junkrandom.120m
[root@nag-manual-nfsclient1 srt]# du -sh *
1.2G	junkrandom
118M	junkrandom.120m
[root@nag-manual-nfsclient1 srt]# cp junkrandom.120m junkrandom.120m1
========creating a 300MB file when there is hardly 35MB free
[root@nag-manual-nfsclient1 srt]# dd if=/dev/urandom of=bricklimit bs=1024 count=3000000
dd: writing `bricklimit': No space left on device
160892+0 records in
160891+0 records out
164752384 bytes (165 MB) copied, 35.6738 s, 4.6 MB/s
[root@nag-manual-nfsclient1 srt]# dd if=/dev/urandom of=bricklimit.1 bs=1024 count=3000000
dd: opening `bricklimit.1': No space left on device
[root@nag-manual-nfsclient1 srt]# 
[root@nag-manual-nfsclient1 srt]# 
[root@nag-manual-nfsclient1 srt]# 
[root@nag-manual-nfsclient1 srt]# ls -l
total 1475652
-rw-r--r--. 1 root root   47190016 Sep  2 22:17 bricklimit
-rw-r--r--. 1 root root 1228800000 Sep  2 22:10 junkrandom
-rw-r--r--. 1 root root  122880000 Sep  2 22:13 junkrandom.120m
-rw-r--r--. 1 root root  122880000 Sep  2 22:14 junkrandom.120m1
[root@nag-manual-nfsclient1 srt]# touch newf1
touch: cannot touch `newf1': No space left on device
[root@nag-manual-nfsclient1 srt]# touch newf1
touch: cannot touch `newf1': No space left on device
[root@nag-manual-nfsclient1 srt]# touch newf1
touch: cannot touch `newf1': No space left on device
[root@nag-manual-nfsclient1 srt]# du -sh *
35M	bricklimit
1.2G	junkrandom
118M	junkrandom.120m
118M	junkrandom.120m1
[root@nag-manual-nfsclient1 srt]#
Comment 1 Nag Pavan Chilakam 2015-09-02 12:11:50 UTC 
sosreports @ 
rhsqe-repo.lab.eng.blr.redhat.com:/home/repo/sosreports/bug.1259312/
Comment 2 Nag Pavan Chilakam 2015-09-02 12:14:12 UTC 
Created attachment 1069404 [details]
qe cli log during bug raising
Comment 3 Nag Pavan Chilakam 2015-10-13 09:40:15 UTC 
This is failing on glusterfs-server-3.7.5-0.18

[root@rhel7-autofuseclient estonia]# for i in {1..100};do touch x.$i;done
touch: cannot touch ‘x.1’: No space left on device
touch: cannot touch ‘x.2’: No space left on device
touch: cannot touch ‘x.3’: No space left on device
touch: cannot touch ‘x.4’: No space left on device
touch: cannot touch ‘x.5’: No space left on device
touch: cannot touch ‘x.6’: No space left on device
touch: cannot touch ‘x.7’: No space left on device
touch: cannot touch ‘x.8’: No space left on device
touch: cannot touch ‘x.9’: No space left on device
touch: cannot touch ‘x.10’: No space left on device
touch: cannot touch ‘x.11’: No space left on device
touch: cannot touch ‘x.12’: No space left on device
touch: cannot touch ‘x.13’: No space left on device
touch: cannot touch ‘x.14’: No space left on device
touch: cannot touch ‘x.15’: No space left on device
touch: cannot touch ‘x.16’: No space left on device
touch: cannot touch ‘x.17’: No space left on device
touch: cannot touch ‘x.18’: No space left on device
touch: cannot touch ‘x.19’: No space left on device
touch: cannot touch ‘x.20’: No space left on device
touch: cannot touch ‘x.21’: No space left on device
touch: cannot touch ‘x.22’: No space left on device
touch: cannot touch ‘x.23’: No space left on device
touch: cannot touch ‘x.24’: No space left on device
touch: cannot touch ‘x.25’: No space left on device
touch: cannot touch ‘x.26’: No space left on device
touch: cannot touch ‘x.27’: No space left on device
touch: cannot touch ‘x.28’: No space left on device
touch: cannot touch ‘x.29’: No space left on device
touch: cannot touch ‘x.30’: No space left on device
touch: cannot touch ‘x.31’: No space left on device
touch: cannot touch ‘x.32’: No space left on device
touch: cannot touch ‘x.33’: No space left on device
touch: cannot touch ‘x.34’: No space left on device
touch: cannot touch ‘x.35’: No space left on device
touch: cannot touch ‘x.36’: No space left on device
touch: cannot touch ‘x.37’: No space left on device
touch: cannot touch ‘x.38’: No space left on device
touch: cannot touch ‘x.39’: No space left on device
touch: cannot touch ‘x.40’: No space left on device
touch: cannot touch ‘x.41’: No space left on device
touch: cannot touch ‘x.42’: No space left on device
touch: cannot touch ‘x.43’: No space left on device
touch: cannot touch ‘x.44’: No space left on device
touch: cannot touch ‘x.45’: No space left on device
touch: cannot touch ‘x.46’: No space left on device
touch: cannot touch ‘x.47’: No space left on device
touch: cannot touch ‘x.48’: No space left on device
touch: cannot touch ‘x.49’: No space left on device
touch: cannot touch ‘x.50’: No space left on device
touch: cannot touch ‘x.51’: No space left on device
touch: cannot touch ‘x.52’: No space left on device
touch: cannot touch ‘x.53’: No space left on device
touch: cannot touch ‘x.54’: No space left on device
touch: cannot touch ‘x.55’: No space left on device
touch: cannot touch ‘x.56’: No space left on device



refer bz#1271151
Comment 4 Dan Lambright 2015-10-26 17:42:11 UTC 
My cannot do anything with write updates, but my understanding is DHT has a mechanism to redirect new file creates to a different brick when the hashed sub volume is full.  Need to understand why this does not work with tier.
Comment 5 Nithya Balachandran 2015-10-30 08:39:40 UTC 
What was the name of the volume on which this failed?
Comment 6 Nithya Balachandran 2015-10-30 09:15:33 UTC 
I tried this on the latest master code and could not reproduce the issue where new file creates were still going to the hashed subvol. 

We cannot do anything about the writes until the file is moved to the cold tier - this is existing DHT behaviour.


I am moving this to WorksForMe. Please reopen if seen again.
Comment 7 Nithya Balachandran 2015-10-30 09:15:33 UTC 
I tried this on the latest master code and could not reproduce the issue where new file creates were still going to the hashed subvol. 

We cannot do anything about the writes until the file is moved to the cold tier - this is existing DHT behaviour.


I am moving this to WorksForMe. Please reopen if seen again.
Comment 8 Nag Pavan Chilakam 2015-11-02 12:05:02 UTC 
Hi,
I saw this not working on latest downstream.
I am cloning this to downstream for further tracking


===========================
[root@mia diskfull]# for i in {1..10};do dd if=/dev/urandom of=bigfi bs=1024 count=300000;done
dd: failed to open ‘bigfi’: No space left on device
dd: failed to open ‘bigfi’: No space left on device
dd: failed to open ‘bigfi’: No space left on device
dd: failed to open ‘bigfi’: No space left on device
dd: failed to open ‘bigfi’: No space left on device
dd: failed to open ‘bigfi’: No space left on device
dd: failed to open ‘bigfi’: No space left on device
dd: failed to open ‘bigfi’: No space left on device
dd: failed to open ‘bigfi’: No space left on device
dd: failed to open ‘bigfi’: No space left on device



fuse mount logs:
==================
d 9 times between [2015-11-02 04:40:08.609241] and [2015-11-02 04:40:08.723177]
The message "E [MSGID: 114031] [client-rpc-fops.c:251:client3_3_mknod_cbk] 0-diskfull-client-6: remote operation failed. Path: /bigfi [No space left on device]" repeated 9 times between [2015-11-02 04:40:08.609351] and [2015-11-02 04:40:08.723197]
^C
[root@mia glusterfs]# tail -f mnt-diskfull.log 
[2015-11-02 04:40:08.635409] W [fuse-bridge.c:1978:fuse_create_cbk] 0-glusterfs-fuse: 30100: /bigfi => -1 (No space left on device)
[2015-11-02 04:40:08.647871] W [fuse-bridge.c:1978:fuse_create_cbk] 0-glusterfs-fuse: 30102: /bigfi => -1 (No space left on device)
[2015-11-02 04:40:08.660484] W [fuse-bridge.c:1978:fuse_create_cbk] 0-glusterfs-fuse: 30104: /bigfi => -1 (No space left on device)
[2015-11-02 04:40:08.673046] W [fuse-bridge.c:1978:fuse_create_cbk] 0-glusterfs-fuse: 30106: /bigfi => -1 (No space left on device)
[2015-11-02 04:40:08.685465] W [fuse-bridge.c:1978:fuse_create_cbk] 0-glusterfs-fuse: 30108: /bigfi => -1 (No space left on device)
[2015-11-02 04:40:08.698471] W [fuse-bridge.c:1978:fuse_create_cbk] 0-glusterfs-fuse: 30110: /bigfi => -1 (No space left on device)
[2015-11-02 04:40:08.710918] W [fuse-bridge.c:1978:fuse_create_cbk] 0-glusterfs-fuse: 30112: /bigfi => -1 (No space left on device)
[2015-11-02 04:40:08.723667] W [fuse-bridge.c:1978:fuse_create_cbk] 0-glusterfs-fuse: 30114: /bigfi => -1 (No space left on device)
The message "E [MSGID: 114031] [client-rpc-fops.c:251:client3_3_mknod_cbk] 0-diskfull-client-7: remote operation failed. Path: /bigfi [No space left on device]" repeated 9 times between [2015-11-02 04:40:08.609241] and [2015-11-02 04:40:08.723177]
The message "E [MSGID: 114031] [client-rpc-fops.c:251:client3_3_mknod_cbk] 0-diskfull-client-6: remote operation failed. Path: /bigfi [No space left on device]" repeated 9 times between [2015-11-02 04:40:08.609351] and [2015-11-02 04:40:08.723197]
Comment 9 Nithya Balachandran 2015-11-02 15:23:31 UTC 
Looks like the hashed file creation is failing because there is no space on the hot tier. We should ideally never get to this situation where the hot tier is 100% full as it will cause DHT to stop working properly.
Comment 10 Kaushal 2017-03-08 10:47:55 UTC 
This bug is getting closed because GlusteFS-3.7 has reached its end-of-life.

Note: This bug is being closed using a script. No verification has been performed to check if it still exists on newer releases of GlusterFS.
If this bug still exists in newer GlusterFS releases, please reopen this bug against the newer release.
Comment 11 vnosov 2018-01-12 18:05:33 UTC 
The bug is reproduced on GlusterFS 3.12.3.