Bug 1262415 - Data Tiering:Scanning files in cold tier when detach tier is issued can take a toll on performance
Data Tiering:Scanning files in cold tier when detach tier is issued can take ...
Product: GlusterFS
Classification: Community
Component: tiering (Show other bugs)
Unspecified Unspecified
medium Severity high
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Assigned To: Dan Lambright
: Triaged
Depends On:
Blocks: 1278350
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Reported: 2015-09-11 11:12 EDT by nchilaka
Modified: 2017-03-08 05:53 EST (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 1278350 (view as bug list)
Last Closed: 2017-03-08 05:53:43 EST
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description nchilaka 2015-09-11 11:12:24 EDT
Description of problem:
I had about 1Lakh files in cold tier and no files in hot tier.
I then issued a detach tier start and check the status.
the status after complete showed as files scanned as all 1Lakh,
Which means if it is rightly showing, we are unncessarily scanning cold tier, which we must avoid for performance sake.

In below case it can be seen that it took about nearly two minutes for detach tier to complete, as it had scanned all cold files. In this case it should have got over in a few seconds as there were no hot files in hot tier.

Version-Release number of selected component (if applicable):
[root@zod ~]# rpm -qa|grep gluster
[root@zod ~]# gluster --version
glusterfs 3.7.4 built on Sep  9 2015 01:30:47
Repository revision: git://git.gluster.com/glusterfs.git
Copyright (c) 2006-2011 Gluster Inc. <http://www.gluster.com>
You may redistribute copies of GlusterFS under the terms of the GNU General Public License.
[root@zod ~]# 

Steps to Reproduce:
1.have a volume and create thousands of files  in cold tier and attach a tier such
2.now issue a detach tier start and wait for it to complete
3.now check the detach tier status, which will show as complete for each node.
But it can be seen that even without any files in hot tier, the files scanned will show as number of files in cold tier, which is wrong
Comment 1 nchilaka 2015-09-11 11:24:16 EDT

[root@rhsqe-repo sosreports]# chmod -R 0777 bug.1262417
[root@rhsqe-repo sosreports]# pwd
[root@rhsqe-repo sosreports]# hostname
[root@rhsqe-repo sosreports]# ll bug.1262417
total 8
drwxrwsrwx. 2 root qe 4096 Sep 11 20:46 node1
drwxrwsrwx. 2 root qe 4096 Sep 11 20:46 node2
Comment 3 Kaushal 2017-03-08 05:53:43 EST
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.

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